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01 January 2019, Volume 34 Issue 6 Previous Issue    Next Issue

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Lacustrine Source Rocks of Middle Jurassic in Southeast Depression in Tarim Basin JIANG Zhenglong1, QIU Haijun2, HUANG Yuping1, JIANG Kunpeng1, FU Wenkang1, CHEN Ji1 2013, 34 (6):  1-1.  Abstract ( 147 )   PDF (300KB) ( 285 )   Save The good source rocks discovered in Yangye formation of the Middle Jurassic in Jianggalesayi area of southeast depression in Tarim basin are dominated by lacustrine mudstone, with thickness of about 288 m, high organic matter abundance, and characterized by TOC of generally greater than 2.0%, hydrocarbon?generating potential of over 2.0 mg/g, kerogen types of II and III, as well as hydrocarbon?generating rate of 300 mg/g·TOC by high temperature and pressure simulation experiment. It is confirmed that the lacustrine source rocks of Yangye formation in the low mature?matured thermal evolution stages are distributed in south?central part of Washixia sag, with good hydrocarbon generating conditions, and certainly, it will be of a bright prospects for petroleum exploration Related Articles | Metrics

Geometric and Kinematic Analyses of Gumudi Anticline in Southern Margin of Junggar Basin SHANG Lin1, DAI Junsheng1, FENG Jianwei1, JIA Kaifu2 2013, 34 (6):  1-1.  Abstract ( 54 )   PDF (300KB) ( 247 )   Save The Gumudi anticline is a typical and complex structure unit of superimposed fault?related folds in the piedmont of northern Tianshan Mountains, with strong deformation. Based on the analysis of 2D seismic profile crossing Gumudi anticline, constrained by the surface outcrop and drilling?revealed structural appearances, this paper presents the shallow folds shapes by fault?related folds analysis, speculates the deep structural styles according to the fold?fault quantitative relationship in geometry, and then develops the reasonable structural model for Gumudi anticline, by which reappears the structural deformation procedures through kinematic recovery of this anticline. The study indicates that Gumudi anticline is a nearly east?west trending anticline and its tectonic deformation took place from late Yanshan movement to middle?late Himalayan movement. The eastern part of the shallow structures in Gumudi anticline is a front faulted?extensional anticline, toward the west it transits to nearly two?side symmetrical detachment?like faulted?extensional anticline, and the deep structure is a dual?stacking structure with the roof Xishanyao coal seam of the Middle Jurassic and the floor Lucaogou formation of Permian Related Articles | Metrics

Analysis of Permian Magmatic Activity and OilGas Accumulation in Zhongguai Swell in Junggar Basin SHAN Jiang 2013, 34 (6):  1-1.  Abstract ( 46 )   PDF (300KB) ( 276 )   Save In the Permian strata in Zhongguai swell in the northwestern margin of Junggar basin, there exists a kind of mixed rocks of magmatic intrusion and eruption formed by multi?period magmatic activities, with an area of several hundred square kilometers, in which the associated volcanic overflow facies are proved to be good oil?gas reservoirs for high?yield oil?gas flow found in the andesite strata of such a facies on the top of Jiamuhe formation at present. And it is suggested that the favorable locations for oil?gas migration and accumulation are in the fault structures formed by magmatic intrusions and the volcanic channels and overflow facies bodies caused by volcanic eruptions.Hence, the detailed description of the magmatic activity stage and its associated faulting, volcanic eruption facies is of significance for both the analysis of oil and gas accumulation and the prediction of favorable reservoir distribution Related Articles | Metrics

The Reservoir Characteristics and the Favorable Prospecting Target in Su5 Block in Sulige Gas Field DU Yang1,2, OUYANG Cheng1, HU Yang1, XIN Jun1, HUANG Wenming1, WANG Haifeng1, PENG Yu1, FENG Xue1 2013, 34 (6):  1-1.  Abstract ( 69 )   PDF (300KB) ( 291 )   Save The Su?5 block is located at the central part of the Sulige gasfield and characterized by high water cut and complicated gas?water relationship. Based on the existing geological and production performance data, this paper presents the correlation of reservoir features and studies the favorable prospecting area distribution. The results show that the lithology of reservoir is dominated by debris quartz sandstone with coarse grain and less difference of porosity; the difference of pore?throat texture determines the size of reservoir permeability, and influences the oil?bearing property of the reservoir; the main factors influencing the pore?throat texture are the secondary pores formed by dissolution in diagenesis and the intergranular micro?fissures formed by rupturing; the organic acidic liquid generated by diagenesis of the lower source rocks into the upper reservoir is the main reason for the dissolution; the high quality reservoir mainly distributed in He?8 member,could be the favorable target for ol?gas exploration in this area Related Articles | Metrics

CHENG Yuhong, MA Xinmin, SHI Yajun, MA Feng, LE Xingfu, WANG Xin, ZHANG Ping 2013, 34 (6):  1-1.  Abstract ( 40 )   PDF (300KB) ( 220 )   Save Based on the latest data from wells and seismic interpretation, this paper firstly discussed the Cenozoic fault geometry and evolution of the eastern part of southern Altun slope in Qaidam basin. According to the planar distribution, the fault can be divided into three groups with NW, NEE and NWW strikes. And on the basis of the profile evolution, there are obviously three stages in the development of Cenozoic fault: in the Paleocene to Eocene, the north tilted fault with the strike of NWW in Jiandingshan area was formed, and the NW?trending fault in Dongping?Niubiziliang?Eboliang nose?like structural belt was positively inversed as well; in the Miocene, NE?trending faults appeared, and in the Pliocene, the south tilted compresso?shear faults with the strike of NWW came into being. Also, by means of formation restoration and structural balance, combined with the principle of material mechanics, the orientations of maximum principal stress in each geological time were determined. Finally, according to the relationship between the orientation of maximum principal compressive stress and the fault activity, the fault close and open processes were discussed, and it is suggested from regional hydrocarbon generation and expulsion history that the Cenozoic fault takes an important part in the large?scale gas accumulation in this piedmont slope bell Related Articles | Metrics

Hydrocarbon Accumulation Conditions and Exploration Direction of Clastic Buried Hill in Kongnan Area, Huanghua Depression, Bohai Bay Basin LONG Liwen1, LI Shuangwen1, ZHAO Min2, JIANG Wenya3, ZHANG Jing1, YAO Jun1, WANG Jing1 2013, 34 (6):  1-1.  Abstract ( 70 )   PDF (300KB) ( 199 )   Save Kongnan area is one of major targets for oil?gas exploration in buried hill reservoir of Huanghua depression in Bohai Bay basin,in which commercial oil flow is found in its Ordovician carbonate rocks and Permian clastic rocks. This paper studies the petroleum geological conditions, hydrocarbon accumulation control factor and enrichment pattern in the Permian clastic reservoir using hydrocarbon accumulation theory and geophysical prospecting technologies, and suggests that there exist two types of fault?block anticline?like and thrus?nappe anticline?like buried hill traps of Permian in this area; the regional compression in Indosinian movement epoch and the tensional and fault?block processes since Yanshan movement laid the foundation of the formation of buried hill reservoirs; the deep and large fault system, inner buried hill highs, fractured sand bodies and stable cap rocks control the oil?gas migration and enrichment in buried hill reservoirs, and forming the favorable reservoir combination. So Kongnan area has favorable conditions for forming large?scale oil and gas field Related Articles | Metrics

Quantitative Evaluation of Fracture Distribution of Chang9 Member in Honghe Oilfield,Ordos Basin WANG Boli1a,1b, ZHOU Wen1a,1b, DENG Hucheng1a1b, LIU Yan1a, LEI Tao2, FAN Lingling2 2013, 34 (6):  1-1.  Abstract ( 71 )   PDF (300KB) ( 307 )   Save The Chang?9 member in Honghe oilfield of Ordos basin is of huge oil and gas resource potentials, its hydrocarbon accumulation and productivity are controlled by the fault/fracture system. The fractures are mainly regional structural fractures and fault?associated or derived fractures. Based on the fracture characteristics of outcrop, cores, imaging logging and genesis analysis, the palaeostress field of Yan?shan and Himalayan period is simulated by means of finite difference method. At the same time, the fault?associated or derived fractures are predicted based on the control function for fracture density near faults. Comprehensive evaluation results show that the fracture developed area is mainly distributed in the sand body area and near the fault zone, with the prediction accuracy of 78%, providing reasonable geologic bases for optimization of the favorable exploration target area Related Articles | Metrics

Unconformity Types and Erosion Thickness Restoration in Nanpu Sag, Huanghua Depression, Bohai Bay Basin PENG Qinghua1, ZHOU Jiangyu2, JIANG Shaobin3a, WANG Yumei3b, MA Yueqin3b 2013, 34 (6):  1-1.  Abstract ( 68 )   PDF (300KB) ( 287 )   Save Nanpu sag underwent multi?stage extensional subsidence and uplifting?erosion cycle evolution, formed six regional unconformities, which can be divided into two categories: parallel unconformity and truncation unconformity. The former includes the Carboniferous bottom and the Mesozoic bottom unconformities; the latter includes the Cenozoic bottom, the Shahejie formation member?1 bottom, the Dongying formation bottom and the Guantao formation bottom ones. The control effects of these unconformities on hydrocarbon accumulation in the study area are mainly manifested in the following three aspects: reservoir reconstruction, as the oil and gas migration channels and sealing. Vitrinite reflectance trend line method is used to recover the erosion thickness of Dongying formation in Gaoshangpu area, Combined with interval transit time method and stratigraphic correlation method, the erosion thickness of Dongying formation in other areas of Nanpu sag has been recovered. The study shows that the erosion intensity of Dongying formation in Nanpu sag could be divided into two districts: the strong erosion district in the northeast part and the week erosion district in the north?central part. Overall, the Dongying formation in Nanpu sag has suffered from erosion, its structural high is big, and its central sag area is small in denudation quantity Related Articles | Metrics

Modeling Analysis of Effect of Interlayer Slip on Fracture Height Growth ZHAO Jinzhou, PENG Yu, LI Yongming 2013, 34 (6):  1-1.  Abstract ( 70 )   PDF (300KB) ( 185 )   Save Structural weak surfaces formed by geological structures such as unconformity and thin interlayer, etc. will lead to interlayer slip and restrain the growth of hydraulic fracture height. The fractures geometrics tend to distorting into complex fractures with horizontal components, which could not be modeled and quantitatively analyzed by conventional method. In order to determine the effect of the interlayer slip on hydraulic fracture height growth, this paper presents dynamic and static stress intensity factors to develop a mathematical model based on the theory of equivalent planar fracture. The mathematical model involves a series of parameters such as net pressure, fracture height, in?situ stress, fracture toughness, horizontal interval length and its distance from central fracture. The computed result shows that the pressure drops formed by vertical distorting structure could be higher than the stress difference of interlayers or barriers, and the interlayer slip has a significant controlling effect on the hydraulic fracture height growth. Therefore, in the process of well? and layer?selection for hydraulic fracturing, the fracturing starting?up position should be properly arranged near the thin layers so as to decrease the fracture height propagation and increase the fracture length Related Articles | Metrics

Determination of Optimal Cyclic Steam Cycles for Converting into Steam Drive HUANG Weiqiang1, MA Xinming2, ZHENG Aiping1, L? Qijun1, BAI Xiujuan1, GAO Guohong2 2013, 34 (6):  1-1.  Abstract ( 72 )   PDF (300KB) ( 216 )   Save In the combination exploitation of steam stimulation and steam drive, the cyclic steam cycles for converting into steam drive are of important effects on the recovery efficiency. The optimal cyclic steam cycles for steam drive are related with reservoir thickness, permeability, oil viscosity etc. and well spacing. In this paper, the factor of converting into steam drive (Cm) is defined on the basis of these influencing factors, and by analysis of 383 steam drive well groups in Karamay oilfield, the relational expression between the optimal cyclic steam cycles and the factor Cm is established, by which the optimal cyclic steam cycles for converting into steam drive of a reservoir or a well group can be determined Related Articles | Metrics

The Impact of Horizontal Well Trajectory Offset on Production by SAGD Process HE Wanjuna, CHEN Xinwenb, ZHAO Ruia, WANG Yanjiea, YANG Zhia 2013, 34 (6):  1-1.  Abstract ( 58 )   PDF (300KB) ( 416 )   Save Based on the typical petrophysical properties and fluid parameters in Wellblock?Z32 in Fengcheng oilfield of Junggar basin, the real trajectories of dual?horizontal well pairs by steam?assisted gravity drainage (SAGD) proses are analyzed and the numerical simulation models for characterization of the lateral and vertical offset in horizontal interval as well as simultaneous lateral?vertical offsets are developed, and the SAGD production performance prediction and response correlation are conducted. The simulation results show that the lateral offset and vertical offset may cause reductions of the peak oil rate, oil recovery factor and oil steam ratio, of which the vertical offset has more impact on the SAGD response. The local vertical offset distance reduction may give rise to partial steam breakthrough in horizontal interval, therefore, during drilling process, the simultaneous reduction of vertical offset distance in the two ends of horizontal interval should be avoided, because when taking simultaneous offsets, the adverse impact on the production is much more than the simply adding of the impact of lateral offset and vertical offset, and the more bi?directional offset, the poorer the SAGD performance Related Articles | Metrics

Performance Evaluation of Surfactant for EOR in High Temperature and High Salinity Reservoirs ZHAO Jianhui1, ZHAO Ji2, ZHOU Daiyu2, YAN Lipeng3, CUI Shiti2, DAI Caili1 2013, 34 (6):  1-1.  Abstract ( 69 )   PDF (300KB) ( 436 )   Save In this paper, over 100 surfactants at home and abroad are preliminarily screened. It is found that the ampholytic surfactant HTHS?1 is of good compatibility with the target reservoirs in Tarim basin. The performance evaluation indicates that this surfactant is characterized by goog thermal stability and strong salinity?tolerant capability. In the conditions of 110°C, salinity of 11.5×104 mg/L, Ca2 + and Mg2+ contents of 7 654 mg/L, the interfacial tension of the HTHS?1 with mass fraction of 0.05%~0.07% can remain by 10?2 mN/m in order of magnitude during the aging time of 30 days. Its good emulsification may slightly decease wettability of the rocks, and its static adsorption is large, and that on the oil sand is higher than that of the clean sand. Also, it takes a long time to achieve dynamic adsorption saturation,with the dynamic retention of 0.507 mg/g, much less than the static adsorption Related Articles | Metrics

An Improved Minimum Miscibility Pressure Prediction Model for Hydrocarbon GasOil Flooding System HOU Dali, LUO Pingya, SUN Lei, TANG Yong, SUN Yang, PAN Yi 2013, 34 (6):  1-1.  Abstract ( 72 )   PDF (300KB) ( 153 )   Save Based on 30 groups of slim?tube experimental data of minimum miscibility pressure (MMP) in hydrocarbon gas?crude oil flooding system, including 8 groups of lean gas drive data and 22 groups of rich gas drive data, this paper makes regression and simulation of a new and universal empirical correlation expression for calculation of the hydrocarbon gas?crude oil flooding system MMP. This expression is a function about reservoir temperature, C7+ relative molecular mass of crude oil, volatile component in crude oil (CH4), intermediate components (CO2, H2S and C2-C6), the molar percentage and relative molecular mass of C2-C5, in injected gas, which can be used to universally calculate the MMP for dry gas and rich gas flooding. In this paper, the three empirical correlation expressions reported in the literature by Kuo, Firoozabadi?Azia and Pedrood that commonly used to calculate high precision of hydrocarbon gas?oil flooding system’s MMP are compared. The results show that the calculation results are more closed to the experimental data from the literature: the average of relative error’s absolute value is 6.11%, the maximum value is 16.39%. In order to further verify the new empirical expression’s prediction ability,other 6 groups of MMP slim?tube experimental data are applied, and the results are relatively high in accuracy, with the absolute value of relative error averages 1.94%, the maximum value is 4.10% Related Articles | Metrics

The Effect of Reservoir Permeability and WateredOut Severity on Microbial Enhanced Oil Recovery CHEN Ye1, DONG Hanping1,2, WANG Yuqin3, LI Hong3, LI Yanan2, XIE Yuyin4 2013, 34 (6):  1-1.  Abstract ( 64 )   PDF (300KB) ( 228 )   Save To investigate the influences of reservoir permeability and watered?out severity on indigenous microbial enhanced oil recovery (IMEOR), indigenous pseudomonas aeruginosa WJ?1, a high-yield biosurfactant strain, was injected into the core samples of different values of permeability (37.9~505.5 mD) after primary water flooding in the reservoir condition of District-mid?6 in Karamay oilfield, and then the surface tension (ST) and oil?water interfacial tension (IFT) of produced fluid after secondary water flooding were measured to correlate and analyze the variations of the IMEOR, ST and IFT. In addition, the core samples with same permeability was flooded by primary water injection to reach the water cuts of 5%, 35%, 65% and 98%, which mean non?watered?out, weak watered?out, medium watered?out and heavily watered?out reservoir environments, respectively, with which the WJ?1 biosurfactant was injected into the same core samples to correlate the effect of such a IMEOR. The experimental results show that the effect produced by the IMEOR process distinctly increases with the reservoir permeability increasing. Compared with low?permeability core samples, the high?permeability core sample of 505.5 mD has the best effect by using the IMEOR process, with additional EOR of 5.42%, low ST of 70.0 mN/m reducing from 72.0 mN/m and low IFT of 5.9 mN/m reducing from 12.0 mN/m. Also, the effect by IMEOR process reduces with the increasing of reservoir watered?out severity. Injecting the WJ?1 biosurfactant into the core samples when the water cut in the produced fluid reaches 5% after primary water flooding,21.98% of additional EOR can be gained Related Articles | Metrics

Study on Improved Vector Decomposition Method for Noise Reduction FAN XU1, SHAO Guanshan2, YANG Wenhua1, TAN Jia1, CAO Siyuan2 2013, 34 (6):  1-1.  Abstract ( 68 )   PDF (300KB) ( 170 )   Save Denoising is an important method in seismic prospecting and has a great impact on the quality of seismic data. Vector decomposition method is to use the angle of noise deviation from the signal to realize suppression of the random noises, belonging to a kind of angle filtering. This method is suitable for prestack and poststack data processing, not restricted by the formation dip, but there is still the problem that noise is not completely separated. This paper proposes a method for further smoothing of the angles by using improved vector decomposition approach based on high?dimensional vector function and spline function to improve the accuracy of the vector angle calculation, in view of the shortage of the discontinuous angles between adjacent tracts after conventional noise suppression. The real seismic data processing shows that this method can be used to get more efficient and more accurate separation between signal and noise, and to filter out random noises, part of multiple and oblique interferences, The case study indicates that this method has good effect of suppressing noise,compared with conventional vector decomposition method Related Articles | Metrics

Forward Simulation and Analysis of 2D Magnetotelluric Method for Hidden Structures YANG Tianchun1, WANG Yanlong2, FENG Jianxin1,WANG Shidang1, ZHANG Hui1 2013, 34 (6):  1-1.  Abstract ( 52 )   PDF (300KB) ( 354 )   Save Because of the complexity of hidden geological structures and their apparent resistivity’s convergent rate of magnetotelluric (MT) method to true resistivity having influence on simulation precision, this paper makes the forward simulation of impedance phase and apparent resistivity of MT method for hidden faults. The finite element method is used to simulate hidden faults’MT anomalies.The apparent resistivity and impedance phase of models are calculated, and then the forward modeling results of transverse electric mode and transverse magnetic mode are analyzed. The simulation results show that the impedance phase is less than 45° when resistivities decrease with depth, and the impedance phase is bigger than 45° when resistivities increase. Also, the impedance phase can represent the electric characteristics of underground media, and its sensitivity is higher than the apparent resistivity. At the same time, the type of hidden geological structure can be distinguished from pseudo?sections of impedance phase Related Articles | Metrics

Application of AllDigital HighDensity Seismic Exploration in Changzhi Area, Shanxi Province L? Mingyan1, ZHA Wenfeng2 2013, 34 (6):  1-1.  Abstract ( 68 )   PDF (300KB) ( 131 )   Save High density 3D seismic exploration has been no clear definition and standard. By investigation of high?density seismic prospecting development process, the definition and reference standard for the all?digital high?density 3D seismic prospecting are presented, proving that the maximum offset approximately equals to the target depth. Taking the first all?digital high?density exploration in Shanxi for an example, the advantages of digital detector are analyzed and the construction parameters suitable for high density seismic exploration in Changzhi area are discussed in this paper Related Articles | Metrics

Application of AllDigital HighDensity Seismic Exploration in Changzhi Area, Shanxi Province L? Mingyan1, ZHA Wenfeng2 2013, 34 (6):  1-1.  Abstract ( 51 )   PDF (300KB) ( 243 )   Save High density 3D seismic exploration has been no clear definition and standard. By investigation of high?density seismic prospecting development process, the definition and reference standard for the all?digital high?density 3D seismic prospecting are presented, proving that the maximum offset approximately equals to the target depth. Taking the first all?digital high?density exploration in Shanxi for an example, the advantages of digital detector are analyzed and the construction parameters suitable for high density seismic exploration in Changzhi area are discussed in this paper Related Articles | Metrics

Feasibility Analysis of 3D Seismic Exploration of the Coal Goaf WEI Hongxue1, SHANG Zhonglei2, ZHANG Jining1 2013, 34 (6):  1-1.  Abstract ( 61 )   PDF (300KB) ( 206 )   Save With the increasing of integration, mergers and acquisitions of the coal mines in China, the survey of the goaf is paid more and more attention to in recent years. The limitations of geophysical conditions of the goaf make it always avoided by 3D seismic exploration as the blind area. However, the development of 3D seismic exploration of coal fields allows the goaf survey or detection to become possible.Taking the 3D seismic exploration of the panel of the Wangjialing coal mine in Shanxi as an example, this paper analyzed the seismic response characteristics of the goaf seismic profile and the characteristics of changes of seismic attributes in it, and showed that the characteristics of both seismic profile and seismic attribute on the coal goaf are all obvious, hence the coal goaf survey by 3D seismic prospecting is feasible Related Articles | Metrics

Fracturing Technology for Dense Oil Reservoir in Jimusaer Sag: Probe and Practice ZHANG Jinga, LI Jiaqib, SHI Xiaochuana, JIANG Honga, HUANG Xinglonga, CAI Xianpinga 2013, 34 (6):  1-1.  Abstract ( 71 )   PDF (300KB) ( 261 )   Save The dense oil reservoir in Jimusaer sag is characterized by compact, ultra?low permeability, thick, thin sand?shale interbed, etc.Owing to many restrictions of the reservoir condition and modification process, etc., using the conventional fracturing modification is difficult to realize the commercial exploitation of such a reservoir. This paper investigates the geological characteristics of the reservoir and its difficulty for modification, introduces the successful experiences for development of dense reservoirs abroad, and proposes a new idea of composite modification of“large?scale fracturing plus volume fracturing”for the reservoir with very poor petrophysical property and without natural productivity by depletion drive, comprehensively taking account of complex fractures and high flow?conductive major long fracture in order to enlarge fracturing volume and improve single well production. For this purpose, two approaches of horizontal well segment fracturing and vertical layered fracturing in the dense oil reservoir in Jimusaer sag were performed, and a series of tools, techniques and technologies were optimized and equipped in 2012, with the cumulative modification of 6 wells and 35 layers in the field, from which the commercial oil flows were obtained. The horizontal well’s fracturing was performed by 15 levels, the production after fracturing reached71.79 m3/d, amounting to about 7 times that of vertical wells by layered fracturing approach. These successful pilot tests have become marks of major breakthrough for exploration of the dense oil reservoir in Junggar basin, meanwhile, provided significant experiences for late large?scale development of such reservoirs Related Articles | Metrics

Drilling Fluid Selection of Well Y128 in Anyue Gas Field, Sichuan Basin BAI Xinjuna, FU Yinguib, DENG Yib, QIU Mingb, ZHANG Zhiganga, GE Naa 2013, 34 (6):  1-1.  Abstract ( 50 )   PDF (300KB) ( 236 )   Save The problem of borehole instability in Triassic of Anyue region has been recognized as a major difficulty for the exploration and development of the gas field. The key of successful drilling of complex lithological formation was to use drilling fluid with appropriate density.This paper analyzed and researched the unsteady factors of Anyue region Triassic complex formation and the difficulties to the implementationof drilling fluid technology, improved the compatibility of the drilling fluid and optimized polysulfonate drilling fluid system as the appropriate drilling fluid. The drilling fluid system has good characteristics in rheology, wall-cake-building ability, oiliness and inhibition. The case study shows that the drilling fluid is of perfect effect on such successful drilling, underground safety and hydrocarbon reservoir protection Related Articles | Metrics

Segment Acidfracturing Techniques for Horizontal Well in Carbonate Reservoirs in Weak Seismic Reflection Area in Tarim Basin LI Chunyue, ZHANG Ye, SONG Zhifeng, ZHANG Zelan, HU Yajie, YANG Fangzheng, WANG Yang 2013, 34 (6):  1-1.  Abstract ( 53 )   PDF (300KB) ( 198 )   Save The weak seismic reflection area in carbonate reservoirs of Tahe oilfield in Tarim basin has low abundant of crude oil reserves which can be effectively produced only by horizontal drilling and segment acid?fracturing process, but using this process, many technical challenges must be faced due to its developed natural fractures, ultra?deep, high temperature and high crack pressure reservoir properties.Based on the investigation of horizontal well segment acid?fracturing techniques and reservoir geologic characteristics in this area, this paper presents the string design, liquid selection and acid?fracturing parameter optimization, by which the field test has been gained successfully in A Well, with good commercial oil flow. This is of significance to the effective producing of unconventional and undeveloped reserves Related Articles | Metrics

Prospects of Oil Shale Development by ChinaUzbekistan Cooperation YE Xiaowei1, LIU Ping2, ZHU Yun2 2013, 34 (6):  1-1.  Abstract ( 80 )   PDF (300KB) ( 209 )   Save Uzbekistan is rich in oil shale resources. In the past 10 years, the oil production of Uzbekistan is declining rapidly. In response to the current situation of domestic fuel shortages, to enhance energy independence and reduce the risks of importing oil products, the Ukrainian government will stimulate the development of oil shale industry in 2013. Meanwhile, Uzbekistan could become the first country that develops oil shale in Central Asia. This paper analyzes the reserves of Uzbekistan oil shale resources and the latest plan of developing the national oil shale resources. In addition, it illustrates the latest mining and processing technologies that may be adopted by Uzbekistan. Finally, integrated with the analysis of the status of Xinjiang oil shale development and the similar geological conditions between Xinjiang and Uzbekistan, the cooperation prospects between the two areas in the field of oil shale development is discussed Related Articles | Metrics

Analysis of Oil and Gas Development Investment Rules and Benefits in Junggar Basin QIN Lia, DONG Weikaia, MA Siyuanb, XIONG Weilia, ZHENG Xiumeic, FENG Xujund 2013, 34 (6):  1-1.  Abstract ( 48 )   PDF (300KB) ( 183 )   Save The study on investment rules of oil and gas development and the predictive analysis on investment demand are main contents for development strategy making and planning for petroleum enterprises. The newly?established oil and gas productivity, development work capacity and cost, investment and benefit variations during 2001-2010 in Junggar basin and its individual petroliferous zone are compared and analyzed, based on which the quantitative estimation of the future oil and gas development investment is made with mathematical prediction methods. It is suggested that the oil development investment benefit of the basin during“the Eleventh Five ?Year Plan”period shows a generally declining trend compared with“the Tenth Five?Year Plan”period. This is mainly because of the decrease of large?scaled and high?quality reserves, low level of producing reserves and the continuously increasing difficulties of newly?established productivity.Generally, the development benefit in northwestern margin of Junggar basin is relatively good, and the development benefit of heavy oil is higher than that of thin oil. With the increase of newly?established productivity during“the Twelfth Five?Year Plan”period, the development investment exhibits a rising trend. It is proposed that the high?quality oil and gas resources development investment should be further increased and the application of new technologies should be highlighted to guarantee the steady growth of oil and gas production and the improvement of development benefit in Junggar basin Related Articles | Metrics

Practice of Overall Horizontal Well Waterflooding Development of Carbonate Reservoir in OmanD Oilfield YANG Shuang1, GUO Rui1, ZHAO Guoliang1, HUANG Song2 2013, 34 (6):  1-1.  Abstract ( 59 )   PDF (300KB) ( 229 )   Save The overall horizontal well waterflooding development of carbonate reservoir is without precedent in Oman. This paper introduces a case of China’s first use of the such a technology to successfully develop the carbonate reservoir with highly depleted, thin?thickness,high pore and low permeability in Oman?D oilfield. The reservoir and fluid characteristic indicates that this oilfield is suitable for horizontalwell waterflooding development, and the overall strategy of long?horizontal section, small well spacing, toe?to?heel reversed deployment and top?production and bottom?injection was determined by reservoir numerical simulation. Pilot test was first implemented. After the successful practice, based on fine geological model and guaranteed by geosteering horizontal drilling technology, the overall horizontal well injection?production pattern was extended and perfected. In the process of horizontal well injection?production optimization, the water injectionperformance was monitored by abundant dynamic and static data, and the displacement of oil by water was tracked by streamline simulation, then the injection and production volumes were modified to reach the goal of evenly displacing oil by injected water. The case study indicates that effect of horizontal well waterflooding development is remarkable. Taking Block?B as an example, its incremental oil was 220×104 t as of end of 2011, and water cut increased stably. The predicted ultimate recovery would be 44% Related Articles | Metrics