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01 January 2019, Volume 34 Issue 1 Previous Issue    Next Issue

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ArcShaped Mechanism of Island Arc HU Daoxiong, CAI Minghua, WANG Baohua 2013, 34 (1):  1-1.  Abstract ( 460 )   PDF (300KB) ( 341 )   Save The form of an island arc is shaped by the rock expansion of back arc basin in long axis direction, which makes axis of back arc basin deformed, that is, it makes island arc bend down to subducted zone direction and forms arc?shaped island. Such a rock expansion attributes to the fact that dehydration of subduction oceanic crust results in the bottom of continental crust on top of the dehydration band (back arc basin long axis direction) to be melted (base invasion), forming arch melting surface, above which the rocks appear to be warmed up and expanded in differentiation. The rock expanding length of back arc basin in long axis direction is directly proportional to the radian of an island arc. The arc length of island arc is equal to the length of back arc basin long axis plus the length of the rock expansion. So, the offset distance and arc length of an arc island can be calculated according to the length of rock expansion, similarly, the length of rock expansion can be calculated by the offset distance or the arc length. Finally, on the basis of rock expansion length and rock lithology, the added temperature value of rocks on rock melting surface, the thickness of continental crust bottom melting (base invasion) area and subsiding depth of the back arc basin are all calculated Related Articles | Metrics

Study of Hydrocarbon Inclusions of Ordovician in Halahatang-Yingmaili Area, Tarim Basin WANG Zhaoming1, ZHANG Nai2, LU Yuhong1, FANG Qifei3, CHEN Ruiyin2, ZHANG Baoshou1, JU Fengping3 2013, 34 (1):  1-1.  Abstract ( 51 )   PDF (300KB) ( 194 )   Save The hydrocarbon inclusions of Halahatang-Yingmaili area in Tarim basin could be divided into three stages by observation of microscopic UV fluorescence. The Stage?Ⅰis representative of a highly matured heavy oil charging, the Stage?Ⅱ of a matured medium hydrocarbon charging, and the Stage?Ⅲ of a highly matured light hydrocarbon charging. Based on previous researches of oil accumulation stages in northern Tarim basin, three stages of hydrocarbon inclusions are formed respectively as follows: Stage?Ⅰis that the heavy oil of the Cambrian in late Caledonian movement entered into the Halahatang area and found near Ha?601?1 and Ha?601?2 wells; Stage?Ⅱis that the crude oil of the Middle?Upper Ordovician in late Hercynian movement entered into the Halahatang-Yingmaili area, and Stage?Ⅲ is that the condensate?light oil modified by Yanshan-Himalayan movement entered into the Yingmai?2 area and the southern Halahatang. It is the three?stage hydrocarbon charging and modification that forms the oil?gas properties and features in Halahatang-Yingmaili area nowadays Related Articles | Metrics

Study of Diagenesis and Diagentic Facies in Toutunhe2 Member Sandstone Reservoir in Fudong Slope Area, Junggar Basin CHANG Qiushenga, WAN Mina, SUN Zijinb, WANG Ruib, WANG Zhongquana, CHEN Honga, ZHENG Yia 2013, 34 (1):  1-1.  Abstract ( 62 )   PDF (300KB) ( 234 )   Save By means of the core thin section, cast thin section, SEM and X?ray diffraction analyses and the sedimentary facies researches, it is indicated that the Toutunhe ?2 member sandstone reservoir in Fudong slope area of Junggar basin underwent destructive compaction, pressolution and cementation, as well as constructive inhibition effect of early edge?distributed clay film on quartz secondary overgrowth and cement precipitation during its diagenesis. From analysis of diagenesis types and evolutionary sequence, it is considered that the major diagenetic evolution of the reservoir is in the late of diagenetic Stage?B, partial in the early of diagenesis Stage?A. Also, on the basis of establishment of diagenetic evolution model, such 4 types of diagenetic facies are classified as film?pore type, rich calcite cemented?pore type, rich kaolinite cemented ? pore type and strong compaction ? pressolution type. They are all controlled by sedimentary micorfacies, diagenetic fluid property and activity, and the oil?gas productivity here is related to the diagenetic facies types Related Articles | Metrics

Abnormal Pressure of Lower Assemblage of Yanchang Formation and Its Hydrocarbon Distribution in Western Ordos Basin FAN Yuhai1,2, QU Hongjun2, WANG Hui1,2, FENG Yangwei 2, LI Min2, ZHENG Yanrong2 2013, 34 (1):  1-1.  Abstract ( 87 )   PDF (300KB) ( 284 )   Save The data of acoustic travel time from 151 prospecting wells in the lower assemblage of Yanchang formation in western Ordos basin are used to analyze the abnormal pressure distribution in it by equilibrium depth method in order to comprehensively discuss the relationship between the abnormal pressure and the reservoir distribution as well as its hydrocarbon migration and accumulation discovered in the studied area. The study shows that the abnormal pressure occurs in Chang?7 and Chang?8 oil layers in this area. The abnormal pressureof Chang?7 is generally higher than that of Chang?8 by 8~12 MPa, so the difference acts as the principal dynamic power to make the hydrocarbon migration downward. Under such a pressure difference setting, most of hydrocarbon reservoirs have been discovered in the areas with high abnormal pressure difference Related Articles | Metrics

Characteristics and Controlling Factors of Mesozoic Reservoirs in Eastern Wushi Sag, Tarim Basin LEI Ganglin1, RAN Qigui2, TANG Yangang1, LI Dejiang2, LI Wei1, CHENG Honggang2 2013, 34 (1):  1-1.  Abstract ( 47 )   PDF (300KB) ( 262 )   Save Based on detailed core observation, thin?section identification and sample analysis and test of 5 wells drilled in Wushi sag of the west end of Kuqa depression in Tarim basin, it is recognized that the Mesozoic reservoir in this sag are all clastic rocks, dominated by debris sandstone; the reservoir spaces are dominated by intergranular dissolution pore, intragranular pores and intercrystal pore, with a few fracture pore, belonging to a medium?low porosity and low permeability reservoir as a whole. Comprehensive analysis reveals that the development of the reservoir is obviously controlled by the sedimentation and diagenesis. And the braided river delta plain sand body, the braided river delta front sand body and the fan delta front sand body are its dominant lithofacies, while the dissolution is the most important constructive diagenesis. It is concluded that the clay interstitial and grain supported sandstone could be the most favorable reservoir and the adjacent major faults which communicate with the oil source is easy to form advantageous hydrocarbon traps in this area Related Articles | Metrics

The Effect of Provenance Intersection on the Petroleum EnrichmentAn example from Chang6 member in Huaqing area of central Ordos basin LIAO Jianbo1, LI Zhiyong1, LONG Liwen1, YANG Jinlong2, YANG Junxia2 2013, 34 (1):  1-1.  Abstract ( 61 )   PDF (300KB) ( 295 )   Save Through the seismic and geological researches of the provenance and rocks properties in Huaqing area in central Ordos basin, it s recognized that there exist two provenances in northeast (Yinshan) and southwest directions in this area. The former controls the distribution of Chang?6 deposit system of Huaqing area as a main source, and its source area’s metamorphic property and rapid accumulation allow he sandstone to be characterized by high content of feldspar and debris as well as low maturity of component and structure. The latter is ontrolled by Qinling?Qilian mountains fold belt, with relatively weak effect on this area as a secondary source, and characterized by quartz ontent higher than feldspar and high maturity of component and structure of sedimentary rocks. Such two provenance systems are intersected along Baima?Wujiao area in the southwestern Huaqing, which takes an important controlling part in distribution of the deposit system here the effect on hydrodynamic regime results in unconspicuous differentiation of sedimentary facies in this intersection area. Also, the ntersections between different sources and deposit system have obvious isolation and control effects on the hydrocarbon enrichment in this rea Related Articles | Metrics

Control of Neotectonism on Hydrocarbon Accumulation and Distribution in Bashituopu Oilfield in Tarim Basin LIU Mingyi1a, DENG Hongwen1a, JIANG Zhenglong1b, WANG Rong1b, XIAO Zhongyao2 2013, 34 (1):  1-1.  Abstract ( 60 )   PDF (300KB) ( 181 )   Save The Neotectonic movement begun in the Miocene is divided into four episodes in Tarim basin, which have affected the petroleum accumulation and distribution in Bashituopu area since the Miocene. Based on the paleostructure restoration of this oilfield, integrated with the analysis of petroleum accumulation and distribution in the four episodes, it is suggested that in different episodes, the trap area, closure height and structural high will be changed in different degrees with the intensity of tectonic movements; in the same structural unit, different traps are of different development or changes, and accompanied with secondary migration and redistribution of petroleum. These characteristics in Bashituopu oilfield can be summarized as convergence and shift model for hydrocarbon accumulation, by which the formation and development process of the petroleum traps in this area can be studied as a guide for exploration and development of oil?gas accumulation zones that affected by episodic tectonic movements Related Articles | Metrics

The Structural Style of Jurassic and Its OilControlling Regularity in Shixi Oilfield, Junggar Basin MA Limin1, LI Zhipeng1, LIN Chengyan1, DONG Bo2, BU Lixia3, CUI Ling2 2013, 34 (1):  1-1.  Abstract ( 56 )   PDF (300KB) ( 203 )   Save The study of the structural features and the hydrocarbon distribution in Shixi oilfield of Junggar basin shows that the large?scale differential rising creates the stretching of the Jurassic, forming the drape anticline, at the same time, shaping extension normal faults at the transfer zones of its flanks. In the process of rising, the Jurassic system at relatively uplifting area tends to form high potential domain of flu?id under squeezing action, which leads to the fact that the hydrocarbons migrated by the faults/fractures opening are difficult to enter the traps for accumulation. By the end of the rising, the hydrocarbons migrating along updip direction of the slope are normally blocked by the closed faults/fractures. This could be the reason why the hydrocarbons are generally accumulated in the traps of downthrow blocks of the faults at relatively low structural positions in Shixi oilfield Related Articles | Metrics

Characteristics of StrikeSlip Faults in No.1 and No.3 Blocks in Central Junggar Basin and Their Significance of Petroleum Geology QIN Feng 2013, 34 (1):  1-1.  Abstract ( 59 )   PDF (300KB) ( 249 )   Save The geological analysis and 2D and 3D seismic data indicate that the strike?slip faults occur in No.1 and No.3 blocks in central Junggar basin. The characteristic of strike?slip fault system appears flower structure in profile and en?echelon and parallel structure on the plane, which could create good transport conditions for forming high quality reservoirs in this area. It is of an important significance to recognize the distribution and development characteristics of such faults in the studied area for speeding up non?structural or subtle petroleum reservoir exploration and re?understanding of the potentials for prospecting of central Junggar basin Related Articles | Metrics

The Structural Evolution and Petroleum Geologic Implication of Baiyinchagan Sag in Erlian Basin WANG Xiande1,2, WANG Ruyan3a, WANG Qun3b, YANG Faqun4, WANG Wei1 2013, 34 (1):  1-1.  Abstract ( 58 )   PDF (300KB) ( 237 )   Save The Baiyinchagan sag is a secondary structural unit of Erlian basin. Based on a lot of geologic, seismic and drilling data, this paper presents the structural and sedimentary evolution history of it and makes a classification of five stages by which its structural framework and sedimentary characteristic are controlled. In Bayanhua group of the Lower Cretaceous in this sag there exist 3 sets of source rocks and 2 sets of reservoirs. They are connective in plane and overlapped in vertical, thus providing good conditions for petroleum secondarymigration and accumulation here Related Articles | Metrics

Structural Evolution and Hydrocarbon Accumulation of Fukang Fault Zone in Junggar Basin WU Junjun, YOU Liping, YANG Heshan 2013, 34 (1):  1-1.  Abstract ( 91 )   PDF (300KB) ( 318 )   Save Fukang fault zone is located in piedmont of Bogda mountain in Junggar basin. Influenced by superimpositions of multistage subtectonic movements of the Hercynian, Yanshan and Himalayan, its structural deformation and hydrocarbon accumulation process were complicated. Comprehensive geological studies suggest that at the late of Early Permian the Bogda trough began to closing, forming the foreland halfgraben?like depression of the Middle Permian Jiangjunmiao depositional stage in the piedmont of Bogda mountain, above which the lagoon facies dolomitic shale of the Middle Permian Pingdiquan formation is the major hydrocarbon source rock in this area; the Yanshan movement period that occurred three episodes of strong movements is the main reconstructive stage in Fukang fault zone; the powerful extrusion stress of Himalayan movement allows Fukang fault zone’s footwall to develop the halfgraben?like sag of thrust?type foreland basin and the thrust nappe at upper wall. The three?stage strong tectonic movements control the structural framework and hydrocarbon accumulation in this area Related Articles | Metrics

Lithologic Feature of Lower Carboniferous Songkaersu Formation in South Piedmone of Kelameili Mountain YUAN Wenxian, LIU Chaorong, PENG Xiling, LAI Shixin, HU Bin, WANG Hui, YANG Jianlin 2013, 34 (1):  1-1.  Abstract ( 61 )   PDF (300KB) ( 239 )   Save The Songkaersu formation of Lower Carboniferous is distributed in the south and north sides of anticlinorium in south piedmont of Kelameili mountain. To understand the lithological feature of it and contact relationship with above and beneath horizons can provide fundamental data for petroleum exploration in this area. The study shows that the eastern Shuangjingzi area occurs continental coarse clastic rock and unconformable contact with underlying Tamugang formation; the western Shuangjingzi area (i.e. east Laoyinggou?Wucaiwan area) appears large volcanic formation interbedded with sedimentary rock. The west’s Songkaersu formation can be divided into lower sub?formation (C1s a, dominated by volcanic rock) and upper one (C1s b by sedimentary rock), they are in conformable contact. The Batamayineishan strata in original Wucaiwan area and Jianshangou-Shaqiuhe area should belong to the lower sub?formation of Songkaersu formation Related Articles | Metrics

The Characteristics of SecondaryPorosity Reservoirs and Exploration Prospects in Junggar Basin ZHANG Congzhen, ZHANG Yueqian, NIU Zhijie, LUO Xinping, WU Xuke, WANG Feng 2013, 34 (1):  1-1.  Abstract ( 80 )   PDF (300KB) ( 242 )   Save Based on reservoir space and pore origin type, taking three secondary ?porosity reservoirs as examples in Junggar basin, this paper presents the concept of secondary?porosity reservoir and discusses the origins of such reservoirs in detail. It is recognized that the deposit combination dominated by dark shale and the deposited pyroclastic materials are the foundations for forming the secondary?porosity reservoirs; the zeolite and carbonate minerals generated during diagenesis are the necessary conditions; the opening of dissolution pores is the key; the trap of mature is the guarantee. The secondary?porosity reservoirs with unique formation mechanism are normally characterized by low porosity and low permeability (except for karst?vug carbonate reservoir), but the concave distribution, in?situ or nearby oil migration, source and reservoir in the same bed or in?situ reservoir, large reserves will become the new domains for oil and gas exploration in Junggar basin Related Articles | Metrics

Volcanic Structure and LargeSized Gas Reservoir of Carboniferous in Kelameili Gas Field, Junggar Basin ZHANG Yong1, TANG Yong2a, ZHA Ming1, CHEN Liyan2b, KONG Yuhua2a, CHEN Zhonghong1 2013, 34 (1):  1-1.  Abstract ( 91 )   PDF (300KB) ( 237 )   Save The relationship between underground volcanic structure and Carboniferous gas reservoir in Kemaleili gas field of Junggar basin was analyzed. The results show that there are three central eruption underground ancient volcanic structures in this area. The eruptive centers of them are located in Dixi?8, Dixi?27 and Dixi?10 well areas. In the central eruption ancient volcanic structure, the subvolcanic rocks and proximal facies lava near the crater have better reservoir property and more developed fractures as well as relative high structure location, which are the favorable zones of the oil and gas migration and accumulation. The overlapped tuff/sedimentary rocks and lava/subvolcanic rocks provide good lateral sealing conditions for the gas reservoir, being beneficial to the gas accumulation. Related Articles | Metrics

Sequence Stratigraphic Classification and Sedimentary Facies Feature in Yuejinsihao-Zhahaquan Area in Qaidam Basin ZHONG Shanglun, MENG Shu, YANG Yongyan, JIANG Ziyin, ZHANG Na 2013, 34 (1):  1-1.  Abstract ( 98 )   PDF (300KB) ( 255 )   Save The Paleocene?Neocene in Yuejinsihao in Qaidam basin is a complete cycle of first?grade sequence, with coarse?fine?coarse grain sizes from the top to the bottom, and can be further divided into three secondary?grade sequences. According to related paleontologysedimentary structure, grain size, geochemical, lithologic and electrical characteristics, four sub?facies in this area could be recognizedsuch as shallow lake, shore lake, delta plain and delta front. Accordingly, six microfacies can be classified, including mud flat, lime mud flat, marl flat, algal hill, branch channel, branch inter?sag and splay. The first and second sequences in the secondary?grade one are obviously influenced by Faults No.Ⅶ and No.Ⅷ, and deposits and reservoir physical property of the upthrow and downthrow have great differences, so the favorable reservoirs could be distributed in the upthrow Related Articles | Metrics

Characteristics of Petroleum Reservoirs of Shengli Blocks in Central Junggar Basin SONG Chuanchun Characteristics of Petroleum Reservoirs of Shengli Blocks in Central Junggar Basin SONG Chuanchun 2013, 34 (1):  1-1.  Abstract ( 64 )   PDF (300KB) ( 145 )   Save In Shengli blocks of central Junggar basin, eight sets of oil?gas show horizons were found, of which oil flow was obtained in seven sets, dominated by lithology of siltstone and non?structural trap, characterized by big differences of depth of oil?gas shows (the maximum deep is more than 6 km), low oil column height. According to the occurrence feature and geologic conditions of oil-gas reservoirs, the main oil?bearing horizons, property differences and the main reservoir types in different blocks were determined. It is recognized that J1s22 and J1s21 in Zhong?1 block are lothologic and litho?structural reservoirs; J2t, J1s and J1b in Zhong?2 block are lithologic reservoirs with nose?like structural setting; J2x and K1q in Zhong?3 block are stratigraphic?lithologic reservoirs, and J2t and K1q in Zhong?4 block are dominated by lithologic reservoir. It is suggested that the structural highs in Zhong?1 and Zhong?3 blocks and the eastern slopes in Zhong?2 and Zhong?4 blocks could be as the targets for petroleum exploration Related Articles | Metrics

Application of InjectionProduction Ratio Method Based on Waterflood Type Curves to Optimization of Water Injection Allocation Calculation YANG Guohong1, SHANG Jianlin2, WANG Yong2, JIA Yonglu1, ZHOU Xia3 2013, 34 (1):  1-1.  Abstract ( 75 )   PDF (300KB) ( 281 )   Save The Baikouquan oilfield in Junggar basin has faced with high water cut stage. In such waterflooding process, determination of water allocation quantity or injection?production ratio is of great significance for keeping oil production stable, controlling water cut and realizing reasonable and effective oilfield development. Using the formulae for waterflooding characteristic curves, the predicting model for injection?production ratio changing with water cut is established. Comparing with the traditional water allocation calculation method, it is characterized by simple limited condition and wide applied range. By given a future water cut, the suitable injection?production ratio can be determined. Its fewer production data requirement and simple calculation method are particularly suitable for the reservoir or block which has less static and dynamic production parameters. Case study shows that this method could be applied to other blocks in this oilfield Related Articles | Metrics

Experimental Study on the Phase Behavior and Fluid Physical Parameters of High CO2Content Natural Gas BIAN Xiaoqiang, DU Zhimin 2013, 34 (1):  1-1.  Abstract ( 85 )   PDF (300KB) ( 684 )   Save The JEFRI?PVT apparatus from DBR Company of Canada was used to test the phase transition from well bottom to well head and the physical parameters of high CO2 ? bearing natural gas, such as compressibility factor (Z?factor), formation volume factor (FVF), compressibility, and density. The experimental results show that no phase transition can be defined at experimental ranges, and with pressure rising, the Z?factor decreases and then increase(the minimal value appears at about 15 MPa), the density rises and both FVF and compressibility decrease (the decreasing amplitude at low pressure is larger than that at high pressure);with CO2 content increasing, the Z?factor decreases and the density increases (the increasing amplitude at high pressure is more obvious than that at low pressure), and both FVF and compressibility have little change; with temperature rising, the Z?factor increases (the biggest change arrives at about 15 MPa), the FVF rises(the increasing amplitude at low pressure is more obvious than that at high pressure), the density decreases (the decreasing amplitude at high pressure is more obvious than that at low pressure), and compressibility has little change Related Articles | Metrics

New Method for Ascertaining WaterBearing Gas Well Inflow Performance TAN Xiaohua, LI Xiaoping 2013, 34 (1):  1-1.  Abstract ( 78 )   PDF (300KB) ( 236 )   Save In the percolation process of a gas reservoir with high CO2 and H2S, gas will escape from water or water will separate out from gas, which always changes the gas reservoir flowing performance. This paper presents the gas?water percolation mathematic model based on the seepage mechanics theory, combining with mass conservation equation and considering the dissolution and volatilization of gas and water in the reservoir, by which the deliverability equation influenced by 4 parameters of laminar coefficient, turbulence factor, gas?soluble water coefficient and water?soluble gas coefficient is deduced thereby. Also, the comprehensive seepage model for calculating the gas?water relative permeability curve, single well controlled reserves and water influx intensity is developed by means of relative permeability equation and pressure drop equation for water drive gas reservoir. Through auto ?matching analysis of gas production, water production and tubing and casing pressure of gas well, above 4 parameters can be obtained by this auto?matching method. This new method can get rid of the limitation of relying on field well testing to determine a gas well productivity Related Articles | Metrics

The Influence of Borehole Fluid Flow Changes on Pressure Data During Gas Well Testing ZHANG Jiafu, BI Quanfu, ZHENG Weidong, ZHAO Zhihui, WU Baozhong, WANG Fusheng 2013, 34 (1):  1-1.  Abstract ( 63 )   PDF (300KB) ( 325 )   Save In gas well testing process, borehole fluid flow distribution is inconsistent under different work regimes. In wellhead shut?in pressure survey, the pressure gauge distance from middle part of a reservoir, phase state differentiation and gravity differentiation have some impact on shut?in pressure data. Based on bottom hole pressure changes recorded in process of a gas well testing, this paper analyzes such fluid flow variation and the causes of little pressure drop after shut?in. it is shown that the process of bottom hole liquid loading at early shut?in and liquid submerging the pressure gauge appears slope line that measured points deviate from theoretical points in the double logarithmic early diagnosis diagram. The results are of a certain significance for pressure data analysis and processing Related Articles | Metrics

A Application of Composite Perforation Technology in Xinjiang Oilfield ZHANG Jing1a, DU Zonghe1b, NIE Hongli1a, JIANG Hong1a, LIU Huijuan2, LI Yue2 2013, 34 (1):  1-1.  Abstract ( 62 )   PDF (300KB) ( 312 )   Save In view of several types of oil and gas reservoirs in Xinjiang oilfield, the optimized composite perforation projects in different blocks are selected to make comparisons of the production effects with adjacent wells by conventional perforation technology. The results show that in medium?low permeability reservoir, adopting the composite perforation technology can get obvious responses in increasing production, increasing water injection and fluid producing intensity, and effectively improve the permeable ability between borehole and reservoir as well as the communication of near?wellbore fractures. However, in reservoirs with poor physical and oiliness properties, the effect could be unsatisfied by such a composite perforation technology Related Articles | Metrics

Synthesis and Mechanism of Dendritic OilSoluble Visbreaking Agent QUAN Hongping, MING Xiansen, HUANG Zhiyu, ZHANG Tailiang, LU Hongsheng, CUI Ronghua 2013, 34 (1):  1-1.  Abstract ( 61 )   PDF (300KB) ( 190 )   Save In view of problems that the oil?soluble heavy oil visbreaking agent has limited conditions for application and low response for visbreaking, a new kind of dendritic oil?soluble heavy oil visbreaking agent was developed. Its visbreaking mechanism is that the polar group in the agent can form hydrogen bond by combining with colloidal asphaltene, and the long?chain alkyl group in it could adsorb a part of colloidal asphaltene, thus inhibiting the accumulation of colloidal asphaltene. In addition, the dendritic structure of this agent allows the colloidal asphaltene to be further dispersed for the purpose of visbreaking. Case study indicates that this agent is better than the oil?soluble visbreaking agent available at present and suitable for visbreaking of multiple heavy oils Related Articles | Metrics

Fractal Characteristics of Shale Pore Structure of Longmaxi Formation in Shuanghe Area in Southern Sichuan HU Lin1a, ZHU Yanming1a,1b, CHEN Shangbin1a,1b, DU Zhili2 2013, 34 (1):  1-1.  Abstract ( 61 )   PDF (300KB) ( 248 )   Save Based on fractal theory and methods and the mercury injection data of shale samples from the Longmaxi formation of the Lower Silurian in Shuanghe area in Southern Sichuan, the quantitative research of the pore structure features is made, giving the fractal dimension D1 and D2. According to the fractal curves, the pore structure of shale of the Longmaxi formation is divided into three types: seepage pore, coagulating?absorption pore and absorption pore. It provides support for researches of nanoscale pore structure of shale and occurrence and migration mechanism of shale gas in this area Related Articles | Metrics

Seismic Identification of Gas Hydrates in Shenhu Shoal Sea Area of South China Sea WANG Houjin, SHA Zhibin, LIANG Jin 2013, 34 (1):  1-1.  Abstract ( 75 )   PDF (300KB) ( 170 )   Save Seismic method is one of important means for research of marine gas hydrate. Based on the measured high resolution multi?trace seismic data, the seismic identification characteristics of potential gas hydrates and the practical application in Shenhu Shoal sea area in northern South China Sea are discussed. The seismic reflection characteristics indicate there are several bottom simulating reflection (BSR) distribution areas with an area of totaling about 5 970 km2, which can be divided into three types of S?BSR, W?BSR and I?BSR, dominated by W?BSR. Furthermore, other features such as weak or blanking amplitude, polarity inversion and low velocity anormaly are found on some seismic profiles. It is estimated from the distribution of BSR and blanking zones that the gas hydrates zone in this sea area is about 10~264 m in thickness, being of good resource potentials of gas hydrates Related Articles | Metrics

HighDensity Vibroseis Acquisition Test for Desert Area in Hinterland of Junggar Basin HUANG Yongping, LIU FeiYAN Jie, LIU Yafeng, WEN Tiemin, LEI Yunshan, LI Xianmin, WANG Zhaolei, LIU Yiyan, JIAN Rui 2013, 34 (1):  1-1.  Abstract ( 68 )   PDF (300KB) ( 227 )   Save In view of the special seismic geological conditions of thick desert area in hinterland of Junggar basin and the needs of exploration of the Jurassic and Cretaceous lithological reservoirs, high?density vibroseis acquisition test is carried out. Using shot pre?design, vibroseis low frequency design, vibroseis slide scanning and seismic data quick inspection and evaluation technologies, the vibroseis efficient high?density 3D seismic acquisition is performed in this desert area, and available data quality has been significantly improved. The test proves that the high?density vibroseis acquisition is feasible in thick desert area of hinterland of Junggar basin Related Articles | Metrics

NearSurface Structure and Static Correction Method for Lu9 Well Area in Junggar Basin WU Qiang, ZHAO Feng, L? Chungang, LIU Jianxin 2013, 34 (1):  1-1.  Abstract ( 54 )   PDF (300KB) ( 206 )   Save The vertical and lateral variation of surface or near?surface structures is one of important factors of causing different wave lengths static correction problem. The surface of Lu?9 well area in Junggar basin is covered by desert and characterized by varied reliefs and typical aeolian sediments. Under the uncemented dune is the early exposed ancient lakebed where cemented or semi?cemented sandshale interbed is distributed and characterized by aqueous origin. In the past the traditional surface structure investigation method could not be used to get accurate depth and velocity parameters of the surface and/or near?surface structures, resulting in that the long wavelength static correction should be made for the seismic data available. This paper presents the method for such correction of seismic data from this well area. The analysis, comparison and result show that such a correction can not only be used to obtain the data as required, but also develop the model for near?surface depth vs. velocity, so as to continuously determine the vertical and lateral velocity variations of strata above the top of high velocity layers and provide basis for the near?surface structural researches Related Articles | Metrics

Corrosion Evaluation and Protection for Wellbore and Surface Pipeline by InSitu Combustion Process HUANG Jihong1, LIANG Jinzhong2, LI Lu1, YAO Tuanjun1, GUAN Wenlong2 2013, 34 (1):  1-1.  Abstract ( 57 )   PDF (300KB) ( 240 )   Save The corrosion behavior of tubing steel in fireflooding field is researched by utilizing HTHP reactor and the corrosion risks have been evaluated according to production characteristics. The results indicate that the temperature, water cut, bottomhole pressure and gas (liquid)?producing capacity of produced fluid in production well by in?situ combustion or fireflooding process are the dominant factors that affect the corrosion rate. The maximal rate appears when temperature reaches 120℃ and water cut at 45%.It is shown that the corrosion rate rises as bottomhole pressure and gas (liquid)?producing capacity rise. When production well reaches a steady phase, the corrosion rate will peak, most possibly causing the corrosion of tubing steel. It is suggested that the anticorrosion strategies should be adopted by selecting suitable materials and adding corrosion inhibitor as well as selectively controlling and reducing corrosion rate in single well Related Articles | Metrics

The Formation of Big Channels by SteamDrive Process and the Analysis of Sand Plug Effect YANG Xiaoyan1, YANG Shenglai2, LIU Zexu2 2013, 34 (1):  1-1.  Abstract ( 66 )   PDF (300KB) ( 207 )   Save Once the oilfield development by steam?drive process enters into high water?cut stage, the big channels formed by this process will cause fluid channeling, injected steam wasting, unsatisfied production well response, thus seriously influencing the effect of oil displacement. Using one ? dimensional sand filling pipe experiment, the big channel formation and the sand production are described, through the change of permeability before and after the implementation of sand plug to judge the feasibility of sand plug of such big channels, the results show that the permeability can be restored to its original value after it. Through conversion of similarity criterion principle, using 3D model to simulate the real reservoir, the instantaneous gas?oil ratio and the cumulative recovery degree of sand plugging during the process of steam drive are analyzed, and suggested that sand plugging should be performed until the water cut reaching 90% for getting good plugging effect. Also, using suitable guar gum suspension liquid with sand to block the big channels formed by steam?drive process, the effect will be more significant Related Articles | Metrics

Waterproofing of Cracks from the Side of Injection Wells in Carbonate Reservoirs V. P. Zakharov1, T. A. Ismagilov1, A. M. Antonov2, A. I. Fedorov2, V. F. Chekushin3 2013, 34 (1):  1-1.  Abstract ( 31 )   PDF (300KB) ( 28 )   Save An algorithm of engineering calculation of cracks waterproofing is given. The results of the engineering calculation of well treatment design, changes in technological factors in the process of its execution, as well as the test area operating mode at cracks waterproofing from the side of injection wells in carbonate reservoirs are analyzed Related Articles | Metrics

Reservoir Configuration Research and Prospect of Different Deposit Systems JIANG Ping, ZHAO Yingcheng, LI Shunming, XU Xiaoming 2013, 34 (1):  1-1.  Abstract ( 62 )   PDF (300KB) ( 451 )   Save Since the concept of reservoir architecture is proposed, the studies have gradually ranged from river deposit system to other various systems. In view of meandering river system, the quantitative studies are achieved for abandoned channel location, configuration interface lateral accretion body’s number and correlation shape?sizing of point bar. For braided river system, the combination relationship between channel and mid?channel bar as well as the model of inner architecture of mid?channel bar are gradually developed. For alluvial fan system, its reservoir architectural grading and identifying model have become the main targets. And for delta front system, the detailed configuration element classification of underwater distributary channel inner accretion body and the mouth bar inner accretion body is focused on. Finally, this paper presents the existing problems and prospects in reservoir configuration studies for different deposit systems. It is concluded that developing configuration models that are more suitable for available geological recognitions, determining the dynamic response features of the reservoir configurations and their relations with the well patterns will be the trend to such researches Related Articles | Metrics

Characteristic and Favorable Area Prediction of Jurassic Plays in Iraq ZHOU Changqian, ZHANG Qingchun, DUAN Haigang, ZHANG Fanqin, WANG Xueling, WANG Xiaozhou 2013, 34 (1):  1-1.  Abstract ( 81 )   PDF (300KB) ( 343 )   Save Iraq is Located in the northeastern Arabian plate crossing five tectonic belts. The reservoir?forming conditions are very complex. After comprehensive analysis of its structure, sedimentation, strata lithology and litholodical facies as well as hydrocarbon distribution, this paper divided the Jurassic into such four plays as Najmah play, Sargelu?Naokelekan play, Mus play and Butmah play and analyzed the characteristics of them, according to the evaluations of the reservoirs, cap rocks and source rocks. Furthermore, this paper presents three favorable exploration areas in different levels. It is recognized that the southeastern Mesopotamia basin is the most potential area for Jurassic petroleum exploration, followed by the folded zone in the northeastern Iraq. But the cost and risk for their exploration and development are also very high Related Articles | Metrics