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01 December 2004, Volume 25 Issue 6 Previous Issue    Next Issue

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Targets for Exploration of Giant Oil-Gas Fields in Tarim Basin KANG Yu-zhu 2004, 25 (6):  581-583.  Abstract ( 118 )   PDF (2396KB) ( 158 )   Save Tarim basin is of superior structural setting, multi-cyclic depositional system, multi-structural system, multi-era petroleum system and multi-epoch petroleum accumulations which are found in late Caledonian-early Hercynian, late Hercynian, Indosinian-Y anshan and Himalayan movements. A major breakthrough for oil-gas exploration was made in Shacan-2 W ell since 1984, more than 30 fields or reservoirs have been discovered, of which 4 belong to giant fields. It is concluded that the major targets for further hydrocarbon prospecting are the paleo-uplift, paleo-slope, fault belt, regional unconformity in platform-basin area and the bruchfalten zone, slope zone in foreland basin as well as overthrust fault belt and various shear structural systems. References | Related Articles | Metrics

Favorable Depositional Facies of L ow Permeability Reservoir in Eastern Shaanbei Slope SONG Zi-qi, BAI Zhen-qiang, CHEN Rong-huan, KANG Li-ming, XU Chun-hua, LUO Zhi-xing 2004, 25 (6):  588-591.  Abstract ( 78 )   PDF (2283KB) ( 180 )   Save Based on the core data and well logs from over 250 wells in studied area, the rock type and assemblage, mineral composition, deposi-tional pattern, structure, log facies, biologic fossil and grain size feature are studied, by which it is confirmed that the underwater distributary channel microfacies, mouth bar microfacies and complex sandbodies which are cut and superimposed by the underwater distributary channels at mouth bar in Chang-6 formation of delta front in AS area could be as the favorable facies for forming the main reservoir body. The specific de-scriptions of the indiv idual microfacies type, composition, characteristic, distribution and corresponding favorable areas were made, thus point-ing out that the well developed underwater distributary channel and mouth bar in Chang-67 member allow their processes to better controls of continuous distribution and range of the major oil-bearing zone in this area. References | Related Articles | Metrics

Formation of the Mouth Bar and Lakeshore Bar and Their Petroleum Accumulation——An example of southern and western depositional systems in Songliao basin WEI Ping-sheng, WANG Jian-gong, PAN Shu-xin, WANG Bin-ting 2004, 25 (6):  592-595.  Abstract ( 159 )   PDF (2411KB) ( 200 )   Save The deposits of mouth bar and lakeshore bar are found at the middle oil-bearing assemblage (Qingshankou and Yaojia formations) in southern and western depositional systems, Songliao basin, characterized by large thickness and wide extension. The thick reservoirs with bottom water shaped by these bars are kinds of significant lithologic reservoirs in this area with high ratio of sand/total strata thickness. Based on the 0-rigin, distribution and internal structure of the bars, the genetic relationship between the bars and faults of minor slip and structures of low am-plitude is discussed. The petroliferous features of the bars are analyzed,by which the petroleum accumulation mechanism,mainly controlled factors and distribution are revealed, and the favorable target areas for petroleum exploration are pointed out in this paper. References | Related Articles | Metrics

Prospects for Petroleum Exploration of Altun Foothill Belt in Western Qaidam Basin JIANG Bo, YUAN Jian-ying, YANG Jian-ping, ZHANC Qi-quan, ZHANG Yong-shu, SI Dan, CHEN Shi-yue 2004, 25 (6):  596-598.  Abstract ( 95 )   PDF (1516KB) ( 159 )   Save Altun foothill belt of western Qaidam basin is regarded as a major pre-exploration belt with abundant petroleum resources, high geo-logical evaluation,, low explorative degree and great potentials for prospecting. The study shows that there exist multiple depositional systems, complex structural deformation, good source conditions and favorable petroleum hydrocarbon migration and accumulation features in Altun foothill belt. The main targets for further explorat ion would be Hongliuquan-Qigequan structural-lithologic zones, Shibei-Ganchaigou struc-tural-lithologic zones, Yueyashan fan delta of Palaeogene and stratigraphic unconformity of Neogene in this belt. References | Related Articles | Metrics

Petroleum Accumulation System of Paleozoic in Tazhong Area, Tarim Basin LIU Ke-qi, LIU Yu-kui, JING Bing, YANG Xi-feng 2004, 25 (6):  599-602.  Abstract ( 94 )   PDF (2987KB) ( 166 )   Save Petroleum accumulation system is a natural subsurface petroliferous system which includes all the essential elements such as source rock, flow-conducting system and trap, and the effective configurations among them. The source rock, flow-conducting system and trap of the Eopaleozoic and Neopaleozoic petroleum accumulation systems are isolated in Tazhong area, in which the petroleum of Eopaleozoic comes from single source, whereas that of Neopaleozoic from multiple sources, shaping three-body systems, respectively. The hydrocarbons mainly come from the source rocks in slope of northern Tazhong area by lateral migration along the unconformity and the Silurian sandstone followed by up-ward migration along the faults, finally, entering into the Eo-and Neo-Paleozoic pet roleum accumulation systems in Tazhong area, Tarim basin. References | Related Articles | Metrics

Prospects for Exploration of Non-Structural Reservoirs of Jurassic in Junggar Basin LUO Kai-sheng 2004, 25 (6):  603-606.  Abstract ( 88 )   PDF (2067KB) ( 142 )   Save The third resources assessment on Junggar basin revealed its great petroleum resource prospects of the Jurassic system for its broad distribution and low degrees of proved reserves. Since Himalayan tectonic movement, the noth Tianshan mountain has been activated increas-ingly toward the north by thrust mode,causing the rapid subsidence of southern margin of Junggar basin and even tilting toward the south. The Jurassic strata appear the south-tilted regional monocline. Two unconformities just regionally occur between the Jurassic and the Cretaceous and between Xishanyao formation and Toutunhe formation of the Middle Jurassic. Furthermore, large-scale fluv ial-delta system,delta front facies and channel sandbodies developed within the Jurassic, which provide solid foundations for shaping the non-structural reservoirs in it. This paper presents and discusses in detail the favorable areas for exploration of these reservoirs of Jurassic in different zones. These are of great signifi-cance for further petroleum prospecting in Junggar basin. References | Related Articles | Metrics

Sequence Stratigraphy of Fuyang Reservoir in Xingshugang Taipingtun Area, Songliao Basin YI Ding-hong, TIAN Guang-rong 2004, 25 (6):  607-609.  Abstract ( 79 )   PDF (3897KB) ( 172 )   Save The facies sequence characteristic in Xingshugang-Taipingtun area in Songliao basin is analyzed by means of principle and method of sequence stratigraphy, detailed core data, recognizing the short-term cycle of datum level and its type in Fuyang reservoir. The well log response model of the datum cycle is developed through core calibration and well logging,classifying the middle-term cycle of datum level. The strati-graphic cycles of short, middle and long terms are presented by integrated analyses of core, well log,logging and 3D seismic data. Based on these, the isochronal stratigraphic framework of Fuyang reservoir is established, and the fluvial-delta sequence feature and evolution process are studied in thes paper. References | Related Articles | Metrics

Characteristic of G eotherm-Geopressure System in Erlian Basin XIAO Wei, LIU Zhen, DU Jin-hu, YI Shi-wei 2004, 25 (6):  610-613.  Abstract ( 87 )   PDF (3701KB) ( 234 )   Save Tengge 'er formation in Erlian basin is of higher geothermal gradient on the whole, but at shallow and deep strata of the basin, it is rel-atively low. In plane, such a lower paleogeothermal gradient occurs in the center of the sag or source area, while higher one in the uplift or slope area. Also, the paleotemperature is higher than the present temperature; in different sags, there exist different characteristics of geothermal field-dependent geothermal anomalies; the depth of oil threshold is becoming shallower gradually from the sag center toward the sag edges. The for-mation pressure coefficients are measured to be less than 1.0, showing its abnormally low pressure system. In different sags, somewhat different abnormally low pressure occurs in different depths, for instance, the shallowest is in Anan sag, the deepest in W uliyastai sag. Vertically, individ-ual geotherm-geopressure system appears for different sags; laterally, normal temperature and normal pressure distribute broadly. According to the fluid dynamic characteristics in this area, the petroleum migration direction and accumulation locat ion could be determined,showing that the reservoirs will mainly be found in fault terrace belt and structural belt with relatively low energy. References | Related Articles | Metrics

Quantitative Modeling of Effect of Intrusion Rock on Hydrocarbon Generationg of Source Rocks LI Chen, MENG Yuan-lin 2004, 25 (6):  614-616.  Abstract ( 66 )   PDF (2460KB) ( 189 )   Save For large-scale magma intrusion area, magma intrusion effects on hydrocarbon generating and expulsing of source rocks have not been recognized distinctly. In Jizhong depression of Bohai Bay basin, where the W en 'an slope encountered with magma intrus ion that entered in-to the Carboniferous-Permian coal measure strata in Palaeogene, which has great effects on thermal evolution of the source rocks. As shown from the basin modeling,the magma intrusion could be regarded as additional geothermal source which can be put as an equivalent terrestrial heat flow value into the modeling in terms of the magma-intrusive depth and geothermal data,obtaining the hydrocarbon-generated and-expulsed re-sults of the source rocks. The estimation shows that the contribution rate of the magma intrusion to hydrocarbon generation in Carboniferous-Per-mian source rocks is up to 62.4%. References | Related Articles | Metrics

Evolution of Hydrodynamics and Petroleum Migration-Accumulation in Gunan Sub-Sag LIN La-mei, JIN Qiang 2004, 25 (6):  617-620.  Abstract ( 79 )   PDF (5847KB) ( 313 )   Save According to the depositional, structural and hydrochemical features in Gunan sub-sag, the hydrogeological process is divided into 3 cycles of hydrogeology of Middle-U pper Eocene to Lower Oligocene in abnormal pressure, Middle-U pper Oligocene in transitional pressure and Miocene to Quaternary. The evolution of hydrodynamic field in this sub-sag underwent 5 stages of Es3-Es2 members which are the major zones of petroleum generation and accumulation. Nowadays, the hydrody namic field assumes compaction-driven flow, being of significant controls on the petroleum migration and accumulation. It is found from simulation of paleo-hydrodynamic field of petroleum migration stage of major reservoir (Shahejie formation) that it is the compaction-driven flow of this stage that al low the petroleum to accumulate tow ards the margin of Gunan sub-sag into crossflow discharge areas followed by shaping three accumulations of the Gudong fault zone in eastern the sub-sag,the upthrow side of Gunan fault in northwestern the sub-sag and the slope in southwestern the sub-sag. References | Related Articles | Metrics

Reverse Fault Types and Their Relationship with Petroleum Migration and Accumulation in Western Qaidam Basin GUAN Da-yong, HU Wang-shui, ZHANG Wen-jun, MAO Zhi-guo, WANG Wei 2004, 25 (6):  621-623.  Abstract ( 66 )   PDF (1876KB) ( 144 )   Save The reverse fault in western Qaidam basin can be divided into three radical types as contemporaneous reverse fault, epigenetic-con-temporaneous reverse fault and contemporaneous fault. The long-term activity of contemporaneous controls the deposits apparenly,forming good reservoir and caprock. The development of these reverse faults underwent the contemporaneous, epigenetic and contemporaneous stages. The earlier development and long-term activities of contemporaneous reverse faults allow petroleum in this area to be in long-term migration, ac-cumulation and enrichment, not only as vertical passages for migration, but also as lateral connection channels between the reservoir and the source rock. References | Related Articles | Metrics

Correlation of Downhole Triassic Strata in Southern Tu-Ha Basin WANG Yu-shan, XU Chang-jie, HUANG Wei-dong, NIU Zhi-jie, WANG Tian-peng, ZHAO Sheng-bin, NI Lian-bin 2004, 25 (6):  624-627.  Abstract ( 79 )   PDF (1686KB) ( 152 )   Save Triassic system is a major sequence for petroleum exploration in Tu-Ha basin. Since 1996, the Triassic pay zone in Lukeqin area has been classified into Karamay formation of Middle Triassic from Late Triassic. In this paper, the Middle Triassic payzone is reclassified back to. original Late Triassic,based on the view point that continental basin structure and climate cyclic changes could control the sequence strati-graphic formations, integrated with the seismic, drilling and well log information as well as analysis of lateral changes of regional strata. Also, the reclassification is supported by inherent mechanism of the well log responses and recognition of the regional unconformity in Xiaoquangou group as a natural dividing line betw een Middle Triassic and Upper Triassic in southern Tu-Ha basin. References | Related Articles | Metrics

The Causes for Dense Reservoirs of Triassic-Lower Jurassic in Hami Depression LI Sen-ming 2004, 25 (6):  628-630.  Abstract ( 62 )   PDF (1753KB) ( 161 )   Save This paper presents microscopic studies and systematic analyses of the buried history of deposits, lithology, pore structure, diagenesis and pore abundance of Triassic-Lower Jurassic clastic reservoirs in Hami depression. Results show that the reservoirs are in low maturity of clastic composition and structure; the diagenesis means the early buried and late uplifted type; the pore assemblage is dominated by residual in-tergranular pore-few solution intergranular pore-mass micropore-diagenetic fissure, with poor pore structures. The diagenetic stage is mainly in late diagenetic stage-B. Higher paleotemperature could be one of the key reasons causing the dense reservoirs; whereas the rapid compaction in early stage and the mass cemented rocks as well as universal poor dissolution might be the direct reason for it. Hence, to make a deep explo-ration would take more risks here. References | Related Articles | Metrics

Trace Elements and Sedimentary Settings of Cambrian-Ordovician Carbonates in Bachu Area, Tarim Basin HE Hong, PENG Su-ping, SHAO Long-yi 2004, 25 (6):  631-633.  Abstract ( 88 )   PDF (1631KB) ( 193 )   Save The trace element characteristics of Cambian-Ordovician carbonates in Bachu area of Tarim basin are studied, and their enrichment mechanisms are discussed. The results show that the enrichment of trace elements is closely related to the original sedimentary settings. The contents of trace elements as K, Na, Al and Fe are relatively low in open platform and platform marginal shoal in comparison with relatively high contents in the slope zone. Trace elements as Mn, Cr, Ni and V trend towards increases from shallow to deep water sedimentary settings, thus could be used to indicate relatively changes of paleo-water depth. The w(Ca)/w(Mg) ratio of major elements is relatively low in dolomite-domi-nated evaporate platform and restricted platform facies, while relatively high in open platform and platform marginal shoal deposits where dolomite is not developed. The w(Sr)/ w(Ba) ratio of open platform facies is relatively high, while relatively low in dolomite-dominated evaporate platform and restricted platform facies. Hence, the trace elements together with major elements of carbonates could be used as effective mark for identification of the sedimentary settings in this area. References | Related Articles | Metrics

Distribution and Significance of Diterpenoid Alkanes in Crude Oils from Eastern Junggar Basin LIAO Jian-de, YANG Bin, CHENG Xian-sheng, XIANG Bao-li, KANG Su-fang, LIU Cui-min 2004, 25 (6):  634-635.  Abstract ( 69 )   PDF (1498KB) ( 157 )   Save The analysis of crude samples from Santai-Beisantai and Jimusaer areas in Junggar basin shows that the bicyclic sesquiterpenoids are rich in the diterpenoid alkanes. From the bicyclic sesquiterpenoids' characteristics, the crude oils from these areas could be classified into three types: Type-A is of high contents of drimanes in terms of the ratio of rearranged drimane/8(H)-drimane of 0.6; Type-B ranges from 0.8 to 1.1; Type-C is bigger than 1.1in this ratio. It is indicated that the three types of crude oils belong to different types of origins based on the dis-tribution of dicyclic sesquiterpenoids. References | Related Articles | Metrics

3D Seismic Prospecting of Ordovician Buried Hill in Sangtamu Area, Tarim Basin DU Zeng-li, RAN Ti-wen, LUO Chun-shu, LI Jian-she 2004, 25 (6):  636-638.  Abstract ( 74 )   PDF (2046KB) ( 145 )   Save The Ordovician buried hill in Sangtamu area of Tarim basin is a fractured and vuggy reservoir. In the year 2000-2001, the seismic data processing integrated with interpretation were made, intensify ing the surface consistence, prestack noise elimination and Hi-Fi processing. By using modern karst theory, seismic attribute cluster analysis and seismic facies technique to study the structural feature and the karst special distribution in this Ordovician buried hill, the favorable reservoirs, the top configuration are well delineated, with objective prediction of devel-opment of the reservoirs and calculation of proved oil-gas reserves. Nowadays, the annual productivity of 200,000 tons has been constructed in this area. References | Related Articles | Metrics

The Exploration of Toutunhe Lithologic Reservoir in Shinan Field, Junggar Basin XU Chang-sheng, YANG Meng-yun, JIANG Zu-qiang, WANG Bin, LI Xia 2004, 25 (6):  639-640.  Abstract ( 91 )   PDF (2041KB) ( 220 )   Save The Toutunhe formation of Shinan field in hinterland of Junggar basin is dominated by braided fluvial deposits with grey-brown lithic sandstone, brown-red and grey-yellow mudstone, and sand depositional thickness of 7~26 m, being a reservoir of medium-low porosity and low permeability. The reservoir is laterally screened by mud and contolled by oil-water interface at low position of the structure. The study shows that the faults and unconformities are dominant in petroleum migration and accumulation of top Jurassic and Cretaceous. The two-stage uncon-formities between the Cretaceous and Jurassic and between Toutunhe and Xishanyao formations of Jurassic are major channels for petroleum migration, whereas the local normal faults play roles in connecting the oil sources to the reservoirs. References | Related Articles | Metrics

Laboratory Evaluation on Foamer Stability by Gas Drive Process MEI Hai-yan, DONG Han-ping, GU Hong-jun, REN Min-hong, CHEN Li-hua 2004, 25 (6):  644-646.  Abstract ( 76 )   PDF (592KB) ( 179 )   Save For production of high-water-cut reservoirs, water alternating gas (W AG) process could be adopted to improve the sweep efficiency, increase the producing reserves and enhance the oil recovery. Foamer as a mobility-control agent for a displacing medium could be properly used in W AG process in order to adjust the water or gas injection profile, improve the productivity and obtain better development effectiveness. In view of specific reservoir and geologic features,the behavior such as foamability and stability of several foamers are tested and evaluated un-der the different conditions, and the foamer volumes are optimized. By considering the relevant factors, the best foaming agent is obtained, which can meet the requirements of selectively plugging the water zones by its displacing adjustment and profile control during the process of gas drive. References | Related Articles | Metrics

Application of F ractal Geometry to Prediction of Capillary Pressure Curves HE Yan, ZHANG Yin-lai, WU Nian-sheng 2004, 25 (6):  647-649.  Abstract ( 96 )   PDF (1564KB) ( 160 )   Save The principle and method of Fractal geometry can be applied to conventional core analysis, including capillary pressure curves in-versed from porosity and permeability data in order to develop the model for prediction of pore throat volume distribution. The real data verify the validity of this method. The capillary pressure curves contain much information about reservoir features, so a series of geologic applications in terms of fractal geometry principle are presented to estimation of reservoir relative permeability; contribution value calculation of arbitrary-interval permeability; evaluation of reservoir heterogeneity; determination of pore-throat radius cutoff; classification of reservoir and non-reser-voir and their quantitative evaluations; quantitative evaluation of flowing pore space and its validity,and estimation of initial oil saturation in reservoir, etc. These provide novel ways for study of pore structure at non-coring intervals and evaluation of reservoirs. References | Related Articles | Metrics

A Simple Method for Determination of Current Open Flow Potential in Gas Well without Repeating Well Testing COU San-quan 2004, 25 (6):  650-652.  Abstract ( 105 )   PDF (1024KB) ( 160 )   Save Open flow potential will drop down with decline of formation pressure in a gas well. During process of development, the open flow po-tential is normally calculated by correlation of the formation pressure and the potential derived from a general equation of gas well productivity in order to get the current open flow potential of the gas well. The given parameters include the open flow potential of deliverability test, the cur-rent formation pressure, the natural gas viscosity and dev iation factor corresponding to formation pressures. The case calculation shows that this method is effective, simple and easy to use. References | Related Articles | Metrics

Production Test Technologies for Exploration Well with Abnormal High Pressure——An example of Huo-10 Well in southern margin of Junggar basin WANG Wei-jun, CHEN Chao-feng, XU Jiang-wen, PENG Shao-tao 2004, 25 (6):  653-655.  Abstract ( 86 )   PDF (787KB) ( 174 )   Save It would bring about greater engineering difficulty of formation test when formation pressure factor is up to 2.5. In an overpressured reservoir, if a hole interval to be tested was subjected to inflow of a large volume of high-density mud during its drilling process, integrated with poor diagenesis and unconsolidation,possible sand problem and mud return could take place in production testing, resulting in plugging or sticking troubles of test pipe string. Once the troubles happened, the well could hardly make a renovation and even be abandoned. Based on the production test process for Huo-10 Well in southern margin of Junggar basin, the technologies for production test of abnormal-high-pressure wells are proposed, including rejection of sand production, optimized perforation, string stress analysis, wellhead auto-monitoring and safe safety enclosed mode, etc. They are of significance for reference to the production or formation test of similar complex wells. References | Related Articles | Metrics

Study on Project of W ater-Gas Alternating Immiscible Displacement in Wenjisang Oilfield YANC Yong-liang, CANG Hui, YANG Zhan-hong, XU Bing-tao, CHEN Jian-qi 2004, 25 (6):  656-658.  Abstract ( 64 )   PDF (1706KB) ( 153 )   Save Wenjisang reservoir in Tu-Ha field is dominated by positive rhythm or complex positive rhythm with undeveloped fauls and fractures as well as few payzone but good sands connectivity. And abundant natural gas resource found in Tu-Ha field could be y ielded by gas injection immiscible displacement. By selecting the gas injection blocks,analy zing the factors of affecting gas injection and planning the optimized pa-rameters for gas injection,the project by water-gas alternating immiscible displacement has been accomplished, forming such an efective and. practicable process of top gas injection and edge water injection for low permeability oilfield, with water-gas ratio of l:1, altermating cycle of half a year, cumulative gas-injected plug of 0.25HCPV. The oil recovery in this reservoir could be increased up to 6%~7%. References | Related Articles | Metrics

Performances of Two Kinds of Polymers Flowing Through Porous Media ZHANC Ji-feng, YE Zhong-bin, YANG Jian-jun, LAI Nan-jun, LI Zhi-jun 2004, 25 (6):  659-661.  Abstract ( 60 )   PDF (1300KB) ( 129 )   Save Hydrophobic associating water-soluble polymer (HAWP) is a kind of polymer, whose hydrophilic macromolecular chains have a few hydrophobic groups. The performances of solutions of HA W P and partally hydrolyzed polyacrylamide (PHPA) flowing through porous media are studied under the conditions of a reservoir simulation. The results indicate that HAWP hydrophobic group tends to bringing about intermolecu-lar association and dy namic and physical cross-linked network, its solution shows a great capability of mobility control, decreasing porous media permeability and anti-scour in distant porous media compared with PHPA. The different flow ing performances of these two solutions in porous media are more related to the molecular structures of polymers. References | Related Articles | Metrics

Project Design for Heavy Oil Displacement by In-Situ Combustion in Zheng-408 Block, Dongying Sag ZHENG Ying 2004, 25 (6):  662-664.  Abstract ( 92 )   PDF (942KB) ( 146 )   Save Based on the criteria of selection and evaluation at home and abroad, integrated with the physical simulation experiments,the. reservoir geological conditions in Zheng-408 Block of Dongying sag are selected and evaluated, and the feasibility of thermal sensitive heavy oil reservoir stimulated by in-situ combustion is demonstrated, followed by the main factor analysis about affecting the process of in-situ combustion and the determination of the best well block for in-situ combustion pilot test according to the physical simulation results and the experiences at home and abroad. Also, in view of the characteristics of thermal sensitive heavy oil reservoir, the optimization of project design and main parameters for heavy oil displacement by in-situ combustion are made. The field implementation and good effctiveness can be as a guide for reference to the development of the same kinds of reservoirs. References | Related Articles | Metrics

Application of Artificial Neural Networks to Carbonate Reservoir in Tahe Field WEI Li-ling 2004, 25 (6):  665-667.  Abstract ( 72 )   PDF (754KB) ( 158 )   Save Tahe oilfield is a crack-cave carbonate reservoir with extremely serious heterogeneity. It is very difficult to recognize this type of reservoir only according to static behavior data. A new idea is put forward that this type of reservoir could be described by using production per-formance data or information. Artificial neural network technique is advantageous for dealing with and predicting the non-linear correlative pa-rameters. This paper, based on percolation theory and integrated with well test result, presents the relations between formation factor and pro-duction performance information, develops the structural model for reservoir parameter prediction by artificial neural network. The field study shows that this technique is of more practical value in the proper recognition of Tahe field. References | Related Articles | Metrics

Evaluation of Permian Reservoir of Bai-31 Well Block in Junggar Basin with Method of Well Test GUO Jian-guo, YANG Xue-wen, SHANG Jian-lin, XU Rui-xiu, JIANG Yao-min, XU Xiong, QIAO De-min 2004, 25 (6):  668-670.  Abstract ( 62 )   PDF (1420KB) ( 164 )   Save The in-depth analysis is made for the Permian reservoir of Bai-31 Well Block in Baikouquan oilfield, Junggar basin, by using lots of well testing data. The result shows that the reservoir is characterized by homogenous dual porosity,dominated by fracture flow with certain dif-ferences in fractural petrophysical property in plane. The post section of buildup curves is in decline due to disturbance from offset wells, which represent the pressure decline status in the whole oil region. The analysis of the disturbance between production wells by using interference test shows that the reservoir is of characteristics of high permeability, good fractural connectivity and high permeable and fractured system. References | Related Articles | Metrics

Application of Seismic Facies Analysis to Classification of Sedimentary F aciesin Shinan-21 Well Block HUANG Xiao-ping, DU Hong-ling, SHI Xiao-chuan 2004, 25 (6):  671-672.  Abstract ( 83 )   PDF (1590KB) ( 203 )   Save Seismic facies analysis true to self se ismic information could overcome some shortcomings from seismic inverse technique as one of important means for sedimentary facies research and reservoir prediction. It can be divided into three types,of which waveform-based seismic facies analysis may integrate with various information of seismic signals and can be adopted to deal with distinct problems. Such an analytical technique based on Stratimagic Softw are Package has been applied to study of the sedimentary facies and buried sandbody distribution of Toutume formation in Shinan-21 Well Block, and good results have been obtained. References | Related Articles | Metrics

A Novel Process for Phase Change Experiment of Gas Condensate in Porous Media LI Jing-song, LI Xiang-fang, TONG Min, CHENG Shi-qing 2004, 25 (6):  673-675.  Abstract ( 71 )   PDF (1276KB) ( 147 )   Save In a condensate gas reservoir, there exist complex in-situ hydrocarbon systems and their interactions with porous media, which tend to. bringing about more complexity in phase behavior change in it. The available experiments of phase behavior change couldnt reflect the charac-teristics of condensate gas in real reservoirs due to their lower pressure and temperature. In view of this issue, a new ex perimental process that can actually reflect such a phase behavior change is developed by applying gas chromatographic technique and based on the theory of phase be-havior change for condensate gas, under the conditions of permeability of 0.01 lμm2 and PVT cell. The results show that greater influences of low permeability porous media on the phase behav ior characteristics of condensate gas. This process is indicated to be more reliable and accurate than available methods for phase-change experiment. References | Related Articles | Metrics

Application of High Temperature Chromatography Technology to Study of the Source Rocks in Songliao Basin ZHANG Ju-he, FENG Zi-hui, FANG Wei 2004, 25 (6):  676-678.  Abstract ( 71 )   PDF (1598KB) ( 179 )   Save By using high temperature chromatography tool for medium-high molecular weight hydrocarbons abundance in crude oil and source rock, the carbon numbers from Co to Cr of hydrocarbons in crude oil in northern Songliao basin could be detected. It is suggested from correla-tion and study of Ying-15 Well for different horizons of source rocks and Ying-16 Well for Heidimiao formation hydrocarbons by this tool that similar geochemical features are found in Nen-1 and Nen-2 members,and clear difference of source geochemical feature occur between Nen-jiang formation and Qing-1 member. Crude oil from Heidimiao formation in Ying-16 W ell is mostly originated in Nenjiang source rocks. High temperature chromatography as a new tool for the researches of crude oil correlation, oil-gas origin and heavy oils can be applied. References | Related Articles | Metrics

Geologic Model for Lithologic Reservoir in Highstand Fan Delta FANG Jie, LU Tian-ming, CUI Zhou-qi, CAI Xue-mei 2004, 25 (6):  679-682.  Abstract ( 67 )   PDF (4155KB) ( 165 )   Save Erlian basin belongs to a Mesozoic continental fault group, in which various types of sedimentary bodies could all be found, especial-ly the fan delta and underwater fan sedimentary bodies occured in steep-sided sections of sags. Hence, it has favorable conditions for forming lithologic oil reservoirs. Baolige reservoir in Bayindulan sag is a sandstone lithologic reservoir in fan delta with typical highstand system tract. This paper analyzes the hydrocarbon accumulation conditions in fan delta lithologic sandstone lithologic reservoir area by means of sequence stratigraphy and geology, and develops the geologic model for fan delta lithologic reservoir with highstand system tract in Baolige area. Also, this paper presents some new methods for recognition of seismic information about the fan delta sandbody configuration and prediction of petrolifer-ous features, and finally introduces applied results for its petroleum exploration. References | Related Articles | Metrics

On Vector Property of Permeability ZHOU Yong-yi, WANG Duan-ping, MA Pan-guang, TIAN Tong-hui 2004, 25 (6):  683-685.  Abstract ( 79 )   PDF (1164KB) ( 170 )   Save The study and practice show that permeability as a kind of vector is closely related to orientations for its scale. The origin of perme-ability vector is presented. Some confusable understandings that occur for application of the vector feature are analyzed. It is pointed out that the permeability means one within flow path, hence it couldn't exist independently without the flow path. Also, it has distinct physical meaning, the. artificial addition and decomposition of it like free vectors in mathematics can not made. Study indicates that two different directions of perme-abilty vectors could not serve as the permeability of corresponding direction for its resulting vector,nor the projection of a permeability vector on a direction as the permeability value on the projected direction. Also, a quantitative calculation model is deduced for anisotropic permeabili-ty, by which the horizontal permeability in any direction could be estimated. The model can be used for the conductivity estimation in different directions in reservoir simulation and for the well space design in different orientat ions in anisotropic reservoirs. References | Related Articles | Metrics

A Novel Classification of Structural Units in Junggar Basin YANG Hai-bo, CHEN Lei, KONG Yu-hua 2004, 25 (6):  686-688.  Abstract ( 111 )   PDF (1798KB) ( 272 )   Save Based on the whole structural evolution in Junggar basin, considering the differences in the structural evolution and petroliferous na-ture in each area, this paper analyzes the all classification conceptions for the structural units and relevant comprehensive geologic reports and seismic profiles, and proposes a set of new and regular concept suitable for classification of the basin and regional structural units. The concept includes 6 Class-I units and 44 Class-II units. In comparison with previous concepts, the piedmont thrust belt in north Tianshan mountain is classified as unit of Class-I ; W ucaiwan sag classified into the uplift in eastern Junggar basin; Zhongguai swell into the uplift in western the basin; Iuliang uplft, Changji sag and Zhangbei fault-fold zone are sub-classified in this article. References | Related Articles | Metrics

Controls of Talas-Ferghana Fault on K ashi Sag, Northwestern Tarim Basin LUO Jin-hai, ZHOU Xin-yuan, QIU Bin, YANG Zhi-lin, YIN Hong, LI Jian-xin 2004, 25 (6):  689-692.  Abstract ( 84 )   PDF (1191KB) ( 214 )   Save A bstract: The right-slip Talas-Ferganhna fault plays significant roles in controlling the strata, structures and petroleum geologic features in Kashi sag since Late Triassic. During the Late Triassic-Middle Jurassc,Kuzgongsu and Kezletao fault basins probably disconnected with each other occurred in the sag, with developed rifted-style source rocks of Lower-Middle Jurassic. During the Neogene-Quatemary, the relevant strike-slip deformation of the fault occurred and controlled the petroleum traps and accumulations in Kashi sag. References | Related Articles | Metrics