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01 January 2019, Volume 33 Issue 4 Previous Issue    Next Issue

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Guidance Function of Emei Taphrogenesis Viewpoint on Discovery of Large Gas Province in Northeastern Sichuan LUO Zhili 2012, 33 (4):  1-1.  Abstract ( 141 )   PDF (300KB) ( 243 )   Save Northeastern Sichuan basin has now become the reef?flat large gas province with a trillion cubic meters of reserves. For its discovery, there were many reasons, of which Emei taphrogenesis viewpoint that proposed by the author over 30 years ago should play an instructive part in it. This paper presents the research process and exploration results by stages, and discusses the Emei taphrogenesis as tectonic background of reef?flat deposits in northeastern Sichuan and the controlling effect on hydrocarbon accumulation conditions of this large gas province. It is finally suggested that pay more attention to Emei taphrogenesis and study Sichuan and Tarim cratonic basins which contain both sedimentary rocks and volcanic rocks, more organic and inorganic natural gas resources will be found in the future Related Articles | Metrics

Formation Mechanism of Large and LowAbundance Lithologic Gas Fields in Ordos BasinAn example from Yulin gas field LI Yanxia1, TIAN Yufeng2, LI Jinghong1 2012, 33 (4):  1-1.  Abstract ( 86 )   PDF (300KB) ( 189 )   Save A series of large and low?abundance lithologic gas fields developed in the Permian of Ordos basin are significant domains for natural gas exploration nowadays. The formation mechanism of Yulin gas field has revealed that under the large flat structural setting,fluvial?delta sands and source rocks are widely distributed and mutually contacted as a“sandwich?type”, providing geologic conditions for large?scale gas accumulation in this area; regional tectonic uplift and denudation as well as large?sized thin sand reservoirs are the primary causes for forming low abundance in Yulin gas field; the distribution of“dessert”of such a field is controlled mainly by quality of transport system, particularly in areas with thick belt sand body and fracture transport systems in which gas concentration is normally high. Based on the geochemical data of fluid inclusion and gas component, combined with structural and depositional evolutions, the formation of Yulin gas field is divided into three stages：preliminary hydrocarbon emplacing and reservoir quality transforming stage in Early?Middle Jurassic; lithologic gas pool forming stage by optimized allocation of gas accumulation factors in Early Cretaceous; Late Cretaceous to nowadays,effective coupling of tectonic uplift and large?sized thin sand reservoir makes the surviving field become large gas field with low abundance until now since Late Cretaceous Related Articles | Metrics

The Triassic Sequence Stratigraphy and Lithologic Reservoir Exploration Targets in Zhongguai Swell SHI Xinpu1a, LI Chen1a, SHAN Jiang1a, LIAO Wei1a, HU Qingxiong1a, HOU Xiangyang1a,YOU Liping1b, CHEN Fanghong2 2012, 33 (4):  1-1.  Abstract ( 53 )   PDF (300KB) ( 163 )   Save Based on drill cores, well logs and seismic data, the Triassic in Zhongguai area in northwestern margin of Junggar basin was classified in sequence stratigraphy as four Class?3 sequences and seven system tracts, and high?resolution sequence stratigraphic framework was established by Class?4 sequence as basic stratigraphic unit. This framework includes the analysis of the space?time configuration of the depositional system and the revealing of the distribution rules of hydrocarbon reservoirs in exploratory areas. The study shows that the boundaries of the Class?3 sequence and Class?4 sequence are significant factors for controlling formations of lithologic traps in this area. The lithologic traps are mainly distributed near the Class?4 sequence pinch out and the surroundings of Well 297-Well Ke?021 in the slope of Zhongguai swell Related Articles | Metrics

Analysis of Sedimentary Facies of Middle Member of Permian Jiamuhe Formation in Xiaoguai Oilfield of Junggar Basin ZHANG Congzhena, ZHANG Yueqiana, LUO Jianlinga, LI Xinbinga, WANG Ruib 2012, 33 (4):  1-1.  Abstract ( 65 )   PDF (300KB) ( 163 )   Save The sedimentary facies of the middle member of Permian Jiamuhe formation in Xiaoguai oilfield in northwestern margin of Junggar basin was always considered as alluvial fan or fan delta facies deposit. However, from point of view of petrology, it is definitely different from the standard alluvial fan facies. As early as 1996 it was considered as volcanic eruptive facies, but at that time,“fan control”theory was prevalent, this understanding was not paid more attention to. On the fifteenth anniversary of the reservoir exploration, this paper presents the understandings about it, so as to deepen the recognition of petroleum geology in this area Related Articles | Metrics

Shale Gas Accumulation Conditions and Favorable Area Prediction of Hetang Formation in South Anhui Province of China CHEN Jie a, ZHU Yanminga,b, LI Wua, CHEN Shangbina,b 2012, 33 (4):  1-1.  Abstract ( 98 )   PDF (300KB) ( 198 )   Save The field observation, sampling and lab analysis indicate that the shale sediment of the Hetang formation of Lower Cambrian in Lower Yangtze region of South Anhui province is widely distributed in the study area, with a thickness of 60~360 m, organic carbon content of 0.5%~7.2%, thermal evolution degree of 2.0%~5.5%, possessing better hydrocarbon?generating potential. The mercury injection experiment shows that its average porosity reaches 0.716%, providing some storage spaces for the free gas. The isothermal adsorption experiment shows that the shale in study area has strong adsorption ability for the adsorbed gas averaging 0.443 cm3/g. It is suggested that the regions of related Shitai?Yixian?Jingxian?Ningguo with an area of 9 100 km2 will be the favorable areas for shale gas exploration Related Articles | Metrics

Relationship Between Present Tectonic Stress Field and Natural Gas Distribution in Kuqa Depression, Tarim Basin ZHANG Fengqi1,2, WANG Zhenliang2, LU Xuesong3, SONG Yubin4, SHENG Xiaofeng3 2012, 33 (4):  1-1.  Abstract ( 61 )   PDF (300KB) ( 206 )   Save The present plane and sectional tectonic stresses were recovered by finite element numerical simulation, their distribution characteristics were summarized, and the relationship between the tectonic stress and the natural gas distribution was analyzed. The results show that in plane, the distribution of maximum principal stress of the sub?salt reservoir in different structural zones is not uniform and characterized by bigger stress in the north than in the south, roughly band?distributing toward near E?W, in the northern part with serious structural compression formed many low?stress areas; in cross section, the maximum principal stress is smaller at the territorial gypsum?salt caprock and its overlying strata, and bigger at the sub?salt strata; and the maximum principal stresses of the Triassic and Jurassic source rocks are generally bigger than that of overlying Cretaceous reservoir. The relative low?stress areas are formed in Kela faulted anticlines and fault blocks in Kelasu structural belt with strong tectonic compression, anticlinal apex and the side of faulted anticline in the upper close to the fault of Keshen zone. The natural gas pools discovered in Kuqa depression up to now are located at the relatively low areas of maximum principal stress Related Articles | Metrics

Conditions of Hydrocarbon Accumulation of Basement Reservoir of Kunbei Fault Terrace Belt in Southwestern Qaidam Basin SHI Lingling1, LI Jianming1, WANG Liqun2, WU Guangda2 2012, 33 (4):  1-1.  Abstract ( 62 )   PDF (300KB) ( 163 )   Save Based on the study of oil sources, tectonic setting, migration pathway, reservoir space, trap and their assemblage relations, the hydrocarbon accumulation conditions of basement reservoir in Kunbei fault terrace belt in Qaidam basin are analyzed. The study shows that Kunbei fault terrace belt close to the Qiekelike hydrocarbon source sag is a persistent developed palaeohigh. With effects of multi?tectonic movements, the reservoir space is dominated by fractures and dissolution pores, and two models for hydrocarbon accumulation in basement reservoir in Kunbei fault terrace belt are developed：one is vertical migration and accumulation model by fault and facture as channels, the other is remote source lateral migration and accumulation model by fault and unconformity Related Articles | Metrics

Origin of Oil/Water Inversion in StructuralLithologic Overpressure Reservoir in Bashituopu Oilfield, Tarim Basin ZHOU Bo1, SHEN Yinmin2, JIA Jinhua1, CHEN Yongquan2, WANG Yueran2, MA Debo1 2012, 33 (4):  1-1.  Abstract ( 65 )   PDF (300KB) ( 158 )   Save The oil/water inversion phenomenon has been revealed by recent well drilling aimed at the Carboniferous bioclastic limestone in Bashituopu oilfield in Tarim basin. To interpret the abnormal phenomenon, the fluid connectivity in this reservoir is analyzed by well performance and production data and fluid property correlation, and the petrological characteristic of the reservoir is investigated by core and thin?section observation. And then the reservoir model is developed by research of its abnormal pressure genesis and relations between oil?gas migration and overpressure. It is suggested that in inner regulation of reservoir, it is the mini?overpressure unit and tight zone that overcome the oil?water displacement pressure and block the oil?gas migration toward the top of slope, hence forming the phenomenon of oil/water inversion. Also, the direction and domain of the non?structural oil?gas prospecting in western Maigaiti slope are presented in this paper Related Articles | Metrics

Sediment Filing Model for Wenchang Formation in Panyu4 SubSag,Pearl River Mouth Basin YI Liping1, CHEN Kaiyuan2, JIN Jiuqiang1, NIU Jiayu1, L? Mingsheng1 2012, 33 (4):  1-1.  Abstract ( 66 )   PDF (300KB) ( 164 )   Save Panyu?4 sub?sag of Zhuyi depression in Pearl River Mouth basin is in early stage of exploration. Carrying on sedimentary filling research is of important significance for its prospecting. Based on tectonics and sequence stratigraphic control on the sedimentary filling, using the 3D seismic data, drilling, well logging and core data, the Paleogene Wenchang formation was divided into 3 third?order sequences,and their development characteristics of seismic facies and sedimentary facies were analyzed, and the sag’s sedimentary filling model was presented finally. It is indicated that in Panyu?4 sub?sag, steep slope zone, depression zone and gentle slope zone occur from southeast to northwest in turn, and the development and distribution of sedimentary systems are controlled by the distribution and combination of syngenetic accommodation faults of all levels, and nearshore underwater alluvial fan and nearshore underwater turbidite fan systems occur in the steep slope zone; the secondary accommodation faults of northwestern gentle slope zone result in the depositional differences from the south to the north; the structural slope break is formed due to faults to the north, and offshore underwater turbidite fan and fluxoturbidite are distributed widely; the gentle slope in the south is not affected by the fault, where large ?scale river deltas are developed; and the semi?deep and deep lake shale occur in the center of lake basin Related Articles | Metrics

Reservoir Prediction of Lower Member of Silurian Kepingtag Formation in Shun9 Wellblock of Tazhong Area in Tarim Basin SUN Suqin, YANG Yujie, DU Weiwei 2012, 33 (4):  1-1.  Abstract ( 58 )   PDF (300KB) ( 169 )   Save The Silurian Kepingtag formation in Tazhong area in Tarim basin belongs to littoral facies sediment, and its target intervals are characterized by low?porosity and low?permeability, great lateral changes and thin mudstone interlayer and sand body. The burial depth of reservoir ranges from 5 500 m to 6 000 m. Because of absorption and attenuation, the resolution of seismic data is relatively low, resulting in difficult reservoir prediction. This paper adopts such techniques as frequency extension processing, amplitude attribute analysis, instantaneous phase and wave impedance inversion, based on the mudstone cap?rock thickness and wave impedance that normally higher than underlying sandstone reservoir, gets good results for reservoir prediction Related Articles | Metrics

Classification and Correlation of Lianglitag Fomation of Upper Ordovician in Tarim Basin CAI Xiyao1,JIN Xianmei2ZHAO Lina2YANG Yufang2ZHU Zhendao2HU Mingyi3 2012, 33 (4):  1-1.  Abstract ( 80 )   PDF (300KB) ( 195 )   Save The stratigraphic classification and correlation in lithology and biostratigraphy and well log interpretation indicate that Lianglitag formation in Tarim basin is an obvious diachronous unit, in which the thinnest is in Tabei area, e.g. Well YM?1 in Shaxi has only 12m in thickness, containing Belodina compressa zone of the bottom of this formation; Well Zhong?2 in Katake uplift has 878 m, indicated by not only Belodina compressa zone, buy also Yaoxianognathus yaoxianensis zone in the top of Lianglitag formation; the thickest is in Tangnan area, 1 271 m thick in Well TN?1.Therefore, Lianglitag formation in Tabei area is corresponding to the Liang?5, Liang?4 members andsome bottom part of Liang?3 of the central uplift zone; the most part of Sangtamu formation assumes heteropic relations with the middle?upper part of Lianglitag formation in Katake and Tangnan. Lianglitag formation in central uplift zone could be divided into 5 lithologic members, but the same member in different wells was not completely isochronal, and the lower 2 members are hiatus in the main part of the uplift zone. By synthetical analyses of the stratigraphy, sedimentary facies and the assemblage of reservoir and cap rocks, the slope breaks in the southern and northern of the uplift zone are considered as the advantageous exploration targets in this area Related Articles | Metrics

Distribution of GypsumSalt Cap Rocks in Yuanba Area of Northeastern Sichuan Basin ZHANG Yuanchun, LU Huangsheng, WU Haiyan 2012, 33 (4):  1-1.  Abstract ( 63 )   PDF (300KB) ( 217 )   Save It has been confirmed from exploration that Yuanba area in northeastern Sichuan basin is rich in oil?gas resources in its marine carbonate reservoir. But at present, fewer researches focus on its cap rock studies. This paper analyzes the typical well logging response of the gypsum?salt cap rock, and by fine interpretation of this rock, presents their statistical thicknesses in different horizons. The results show that the gypsum?salt zones are vertically distributed in Leikoupo formation, Jialingjiang formation and the fourth member of Feixianguan formation, of which Jia No.4?Jia No.5 and Jia No.2 members as two sets of gypsum?salt rocks are of the largest single thickness and cumulative thickness. In plane, these two sets of gypsum?salt rocks are characterized by thinning to the west and north and thickening to the east and the south, as well as good continuity and big thickness, which should be the high?quality cap rocks in this region Related Articles | Metrics

Recovery and Geologic Significance of Paleogene Eroded Thickness in South of Wubao Fault Zone in Gaoyou Sag YANG Yuping1, ZHONG Jianhua1,2, DUAN Hongliang3, CHEN Hong1 2012, 33 (4):  1-1.  Abstract ( 59 )   PDF (300KB) ( 128 )   Save This paper recovered the paleotopography of late Sanduo, establishes the burial history and thermal history by using the highest paleotemperature method of vitrinite reflectance and the mapping method of mudstone acoustic time difference to estimate the eroded thickness on hanging wall and footwall in Wubao?Bozhen fault zone in Gaoyou sag. The results show that the eroded thickness on footwall is 1400~1 700 m, and that on hanging wall is 800~1 100 m; the higher the paleotopography, the larger the eroded thickness. The source rocks in No.2 member and No.4 member of Funing formation on hanging wall has reached the oil threshold, respectively, in late Dainan formation and early?middle Sanduo formation, after that, a great amount of which are matured and generate hydrocarbon; the source rocks of No.2 member of Taizhou formation on footwall reach the oil threshold in early?middle Sanduo formation, but they are still in immature or low?mature state for shallow burial conditions in late period Related Articles | Metrics

Characteristics of Hydrocarbon Accumulation of Fuyu Reservoir in Chaoyanggou-Changchunling Area WANG Lili 2012, 33 (4):  1-1.  Abstract ( 81 )   PDF (300KB) ( 141 )   Save The study from the sediments, structures and hydrocarbon accumulation systems in Chaoyanggou-Changchunling area (Chao-Chang area for short) shows that this area is located between two effective hydrocarbon source sags of Sanzhao and Wangfu, which are characterized by that abundant oil sources and multistage channel sands provided reservoir spaces for hydrocarbon accumulation; strata overpressure became driving force of oil and gas drainage downward; the oblique crossing of the sand and fault formed channels for hydrocarbon migration and accumulation. Also, it is recognized that there are multiple types of reservoirs in Chao-Chang area, including lithologic, structural ? lithologic and lithologic ?structural one, and many models for short ? middle ? remote distance lateral hydrocarbon migration and accumulation with source bed in recent formations and reservoir bed in ancient formations. Finally, this paper presents prediction of three favorable oil?gas bearing areas of Class?Ⅰ, Class?Ⅱ and Class?Ⅲ in this area Related Articles | Metrics

Deduction and Comparison of Relationships Among Three Kinds of Rock Compressibility Factors CHEN Yuanqian, ZOU Cunyou 2012, 33 (4):  1-1.  Abstract ( 290 )   PDF (300KB) ( 161 )   Save Rock compressibility factor is one of important parameters in petroleum engineering. In terms of different definitions, it can be divided into rock bulk compressibility factor, rock pore bulk compressibility factor and rock matrix bulk compressibility factor, among which the rock pore bulk compressibility factor is broadly applied to petroleum reservoir engineering, reservoir numerical simulation and well log interpretation, etc. The relationship among these three factors is deduced, thus giving correct result for argument about Prof. Li Chuanliang’s expression in recent years Related Articles | Metrics

Practices of Oil Development of Ordovician Carbonate Reservoirs in Tahe Oilfield by Drainage Process HU Wenge1,2, LI Xiangfang1 2012, 33 (4):  1-1.  Abstract ( 39 )   PDF (300KB) ( 123 )   Save The Ordovician carbonate reservoirs with fractures and cavities in Tahe oilfield is characterized by serious heterogeneity, great changes of reservoir space, complex oil?water relations. Some wells drilled into the water zones procuce oil after high backflow volume. By means of experiences of searching gas by drainage process in Sichuan basin, it is recognized that the searching oil by drainage process can be practicable in Tahe Ordovician carbonate reservoirs. From the successful test, the process is optimized by selection of non?production wells with certain reservoir space, weak water energy, better logging data, oil flowers or H2S in testing. The successful practice of searching oil by drainage process in Tahe Ordovician carbonate reservoirs has deepened the recognition of hydrocarbon accumulation in such a reservoir, opening a new way for developing the carbonate reservoirs in Tarim basin Related Articles | Metrics

Practices of Oil Development of Ordovician Carbonate Reservoirs in Tahe Oilfield by Drainage Process HU Wenge1,2, LI Xiangfang1 2012, 33 (4):  1-1.  Abstract ( 75 )   PDF (300KB) ( 192 )   Save The Ordovician carbonate reservoirs with fractures and cavities in Tahe oilfield is characterized by serious heterogeneity, great changes of reservoir space, complex oil?water relations. Some wells drilled into the water zones procuce oil after high backflow volume. By means of experiences of searching gas by drainage process in Sichuan basin, it is recognized that the searching oil by drainage process can be practicable in Tahe Ordovician carbonate reservoirs. From the successful test, the process is optimized by selection of non?production wells with certain reservoir space, weak water energy, better logging data, oil flowers or H2S in testing. The successful practice of searching oil by drainage process in Tahe Ordovician carbonate reservoirs has deepened the recognition of hydrocarbon accumulation in such a reservoir, opening a new way for developing the carbonate reservoirs in Tarim basin Related Articles | Metrics

Improvement and Application of Method for Prediction of Volumetric Sweep Efficiency in WaterDrive Oilfield HU Gang 2012, 33 (4):  1-1.  Abstract ( 71 )   PDF (300KB) ( 165 )   Save Based on the previous studies, a new method for prediction of volumetric sweep efficiency in wate?drive oilfield using Zhang’s water drive curve. The case study indicates that the method is simple, practical and effective, successfully overcoming the problems of applied condition limitation and narrow applicable scope. It can adapt to the different water cut laws in different water?drive oilfields Related Articles | Metrics

PlugRemoval Technology for Glutenite Reservoirs in Karamay Oilfield BAI Yizhen 2012, 33 (4):  1-1.  Abstract ( 60 )   PDF (300KB) ( 135 )   Save The stratum pore?plugging near wellbore found in the glutenite reservoirs in Karamay oilfield is caused mainly by clay expanding and migrating in strata, the leak?off of inflow liquids from drilling, completion and workover, or by sedimentation of heavy components of crude oil and bacterial growth, or occasionally by Jamin’s effect. Such multi?factor effects need corresponding plug?removal treatment of clay?acid coordinated with other chemicals according to the plug characters and stratum sensitivities to restore or enhance permeability,control sand, demulsify, prevent water?lock or acid?sludge in Karamay glutenite or conglomerate reservoirs Related Articles | Metrics

Evaluation and Application of Foam Discharging Agent on Sulige Gas Field BAI Yunyun1, ZHANG Yongcheng2 2012, 33 (4):  1-1.  Abstract ( 60 )   PDF (300KB) ( 139 )   Save In view of producing water?bearing gas from gas wells with low pressure, low productivity in Sulige gas field, the foam drainage gas recovery technology is studied. The experiments of four types of foaming agents in fluid?carrying capacity, dynamic carrying water and compatibility at 90℃ are tested. The results show that the foaming agent of 0.5% UT?11C is of good stability, good dynamic liquid carrying capacity and good corrosion inhibition performance. And the gas production of well has more increased than before for its better liquid carrying effect, bringing about the expected target for foam?drainage enhancing gas recovery Related Articles | Metrics

Comparison of Production Prediction Models for Several OilGas Fields ZHOU Peng1, CHEN Xiaofan1,YUE Ping1, L? Bei1, CHEN Qiushi2, GU Xuan3 2012, 33 (4):  1-1.  Abstract ( 64 )   PDF (300KB) ( 145 )   Save This paper presents comparative analysis of Rayleigh model, HZC model and Weibull model in model development and feature as well as mathematical relationships among the maximum annual production, the maximum annual cumulative production and the recoverable reserves. The study indicates that the cumulative production at the maximum annual production from Rayleigh model amounts to 39.35% of recoverable reserves, and this model can be appropriate for oil and gas fields with production rate increasing rapidly first and then decreasing quickly after reaching the peak annual production; the relationship between the cumulative production and recoverable reserves at the maximum annual production from HZC model is controlled by the parameter B, it can be more widely used compared with Rayleigh model; however, the relationship between them from Weibull model is governed by the parameter α, so its applicability is the widest of the three models Related Articles | Metrics

Multiwell Anticollision and Barrier Avoidance Technology and Application in Dense Well Pattern LI Hongbin Multiwell Anticollision and Barrier Avoidance Technology and Application in Dense Well Pattern LI Hongbin 2012, 33 (4):  1-1.  Abstract ( 50 )   PDF (300KB) ( 122 )   Save Well Du84?Xing H3001 is a horizontal well drilled for producing the remaining oil by means of infill drilling. Due to Well Du84 is in a dense well pattern, more and more wells need to avoid collision and bypass the barriers while drilling, great challenging to the drilling technology. MWD technology was adopted for real time prediction and analysis and tract control of the tract and to make a practicable operation scheme. Ultimately, four near?distance wells are successfully bypassed. The real tracks fully meet the requirements of engineer?ing design and geological conditions Related Articles | Metrics

Application of MultiComponent Seismic Exploration Technologies in Northwestern Margin of Junggar Basin QIU Sujiang, HUANG Jian, CHENG Hui 2012, 33 (4):  1-1.  Abstract ( 62 )   PDF (300KB) ( 148 )   Save Using P? and S?wave data and well logs in Chepaizi area of Junggar basin, combined with the properties and characters of P?wave and converted wave, the observation system using converted wave for exploration is designed, and the high?quality multi?component seismic exploration data are obtained by negative offsets inversion of horizontal component, converted wave noise removal, static correction, CCP gathers stack, velocity analysis and time migration, etc. The interpretation results coincident with the drilling results are gained by P? and S?wave calibration and simultaneous inversion, synthetic seismographic record making, converted waveform identification, horizon correlation, attribute profile computing and seismic petrophysical property analysis, etc Related Articles | Metrics

Application of VelocityVaried Mapping Technique to Yakenbei Area in Kuqa Depression of Tarim Basin LI Chunlei, YANG Zichuan 2012, 33 (4):  1-1.  Abstract ( 64 )   PDF (300KB) ( 129 )   Save Yakenbei area in Kuqa depression is characterized by high?relief, non?homogenous distribution of deep geological body with special lithology and complicated geologic conditions in surface and subsurface. They are the main reasons for influencing velocity analysis and the trap?scale determination in this area. The conventional research of trap study by seismic data is based on the fixed datum, but the errors between forecast depth by seismic data and actual drilled depth are normally big. So, the velocity?varied mapping technique based on the floating datum in this area is proposed and carried out. The result indicates that the predicted precision by this method is much higher than that by using fixed datum, providing powerful tool for trap study of complex areas Related Articles | Metrics

PointLineSurfaceGeometry FourStep Structural Modeling for Complex FaultBlock Reservoir SHI Yucheng1, CHEN Mingqiang2, ZHANG Shenqin1, CHANG Lin1, ZHANG Yu1, XU Shanshan1, LI Hong1 2012, 33 (4):  1-1.  Abstract ( 69 )   PDF (300KB) ( 160 )   Save Structural modeling is the foundation of 3?D geological modeling for lithological reservoir. Establishing an accurate stratigraphic framework is the fundamental guarantee for reservoir facies model and attribute model development. The complexity of structure makes the structural modeling for complex fault?block reservoir more difficult than for traditional lithological reservoir. Combined with the feature of complex fault?block reservoir and conventional process of 3?D geological modeling, this paper presents Point?Line?Surface?Geometry four?step structural modeling technique and detailed operation procedure. In view of Youshashan reservoir characteristics in Qaidam basin, the 3?D structural model is developed for this complex fault?block reservoir by using the four?step structural modeling technique Related Articles | Metrics

A New Method for Clay Mineral Identification of Fine Sediments ZHANG Lixia, LI Peijun 2012, 33 (4):  1-1.  Abstract ( 65 )   PDF (300KB) ( 145 )   Save Under polarization microscope, using existing clay mineral identification method to distinguish bedded tuff and argillaceous rock with grain size less than 0.03 mm is difficult. This paper proposes a method for identification of clay minerals in fine sediments, by which clay minerals occurred in sediment can be rapidly and correctly determined by using polarization microscope, showing the results which is the fine bedded stuff or which is the normally sedimentary argillaceous rock Related Articles | Metrics

Method for Determination of Hydrogen Sulfide in Crude Oil CHEN Qing1, CHEN Deen2 2012, 33 (4):  1-1.  Abstract ( 135 )   PDF (300KB) ( 512 )   Save The problems occurred in these methods for determination of hydrogen sulfide in crude oil such as water extraction, nitrogen stripping ? chromatography, nitrogen stripping ? XVI total sulfur analyzer and nitrogen stripping ? iodometric methods are analyzed. The iodometric method for determination of hydrogen sulfide in crude oil combined with nitrogen stripping method is finally recommended and is further improved from the detection device, steps, formulas, etc Related Articles | Metrics

Using Interwell Electric Potential Monitoring Technique to Control Surface Steam Breakthrough in HeavyOil Reservoir of Zhong32 Wellblock in Junggar Basin HUO Jin, SANG Linxiang, LI Jianxin, ZHANG Yuan,YANG Yuyao 2012, 33 (4):  1-1.  Abstract ( 68 )   PDF (300KB) ( 156 )   Save The Qigu reservoir in Zhong?32 Wellblock of Junggar basin belongs to a shallow super heavy?oil reservoir. Since bringing into production in 2007, the first surface steam breakthrough occurred in September 2007. Up to February 2011, there are 13 surface steam breakthrough spots appeared in 6 areas, and 138 wells have been affected by 317.7 t/d reduction of output, resulting in that 247.3×104 t OOIP can not be produced. By using the interwell electric potential monitoring technique to verify the surface steam breakthrough channels, seal the steam breakthrough node well from underground by means of high temperature formation sealing technique, the surface steam channeling problem have been well solved, with measure successful ratio of 100% and remarkable economic benefits Related Articles | Metrics

Formation Pressure Prediction of Drilling into Complex Zones in Piedmont of Tarim Basin YIN Guoqinga, ZHANG Huia, LI Chaoa, YUAN Fanga, DING Zhiminb, WANG Junweic 2012, 33 (4):  1-1.  Abstract ( 76 )   PDF (300KB) ( 169 )   Save The correct prediction of formation pressure as dirrect basis of drilling well bore structure, mud quality and drilling parameter design is of great significance to high quality, efficient and safety drilling, reducing downhole complex problem, preserving oil?gas zones,well cementation and completion. The piedmont of Tarim basin was of limitations of geology, seismic data and related knowledges, so the correct prediction of pre?drilling formation pressure was difficult, and the proper drilling engineering implementation was affected. This paper presents the method for proper prediction of strata pore pressure, collapse pressure and fracture pressure by using the pre?drilling formation pressure, drillstem test, corrected pressure prediction model, model parameter modulation, re?calibrating well?corrosing seismic data, establishing non?linear mapping relation and undrilled strata petrophysical information prediction, etc. in order to provide support bases for parameter’s optimization and regulation of next drilling process Related Articles | Metrics

Application of RealTime MicroSeismic Wave Monitoring Technology for Artificial Cracks to Low Permeability Reservoir Reformation LIU Yanga, FU Zhib, LI Jiea, XIAO Pinga, CHEN Honglingc 2012, 33 (4):  1-1.  Abstract ( 43 )   PDF (300KB) ( 150 )   Save Real?time micro?seismic wave monitoring technology for artificial cracks in the process of hydraulic fracturing was applied to the Carboniferous volcanic reservoir with low permeability in southern District?9 in Karamay oilfield, the information such as orientation,length, height, occurrence and maximum principal stress direction of artificial fractures in fracturing intervals can be finally determined by building up database of geophysics, rock mechanics, reservoir reformation and micro?seismic wave signal, etc., integrated with a series of interpretation and processing of the cracks and fractures, based on regional structure, reservoir property and fracturing parameters, so as to provide scientific basis for optimizing such reservoir hydraulic fracturing parameters and designing next development scheme Related Articles | Metrics

Formation Conditions of Panhandle-Hugoton Gas Field in North America and Puguang Gas Field in Sichuan Basin of ChinaContrast and Revelation XU Sihuang1, CAO Tingting2, Watney W L3 2012, 33 (4):  1-1.  Abstract ( 95 )   PDF (300KB) ( 153 )   Save Panhandle-Hugoton gas field in North America and Puguang gas field in Sichuan basin of China are all giant marine carbonate gas fields in the world. It is suggested from comparison and analysis of the geological setting, pool?forming condition and process of these two gas fields that Panhandle-Hugoton and Puguang gas fields are all characterized by multiple source rocks, good reservoir rocks with middle?high porosity and permeability, and the gas pools suffered multistage reformation and stabilization controlled by late tectonization, and gypsum and salt cap rocks. The most difference between them is the development degree of their cap rocks. The thickness and continuity of regional gypsum and salt cap rock in Panhandle-Hugoton gas field are clearly superior to those in Puguang gas field, showing that the sealing and preserving condition are the key factors for the formation of giant gas field under the geologic conditions of sufficient gas source and good reservoir. It is predicted that other giant gas fields the same as or even larger than Puguang could be found in the areas where both reef?flat reservoirs in Feixianguan formation and gypsum and salt cap rocks in Jialingjiang formation are developed, such as Wanzhou and Dazhu areas, in South China Related Articles | Metrics

Origin of Crude Oil and Relation with Hydrocarbon Migration and Accumulation in South Turgai Basin WU Lingang1,2, LI Xiusheng1, WANG Chengyun1, FANG Jiazhong3, ZHANG Jinhai3, GAO Gang1 2012, 33 (4):  1-1.  Abstract ( 65 )   PDF (300KB) ( 154 )   Save Related Articles | Metrics