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01 February 2005, Volume 26 Issue 1 Previous Issue    Next Issue

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Prospects and Targets for Petroleum Exploration in Junggar Basin ZHAO Dian-dong, LIU Chuan-hu 2005, 26 (1):  1-5.  Abstract ( 112 )   PDF (1588KB) ( 281 )   Save Junggar basin is rich in hydrocarbon resources, low degree of prospecting and high potential for exploration. Based on its prospecting status and efforts, this paper makes the analysis and discussion of the control factors for petroleum accumulation and targets for further exploration. It is concluded that non-structural reservoirs will be ma jor ty pes of prospecting; the slope belts with high swells are of conditions for forming large-scale stratigraphic reservoirs; in complex piedmont thrust nappe there are many targets and high potentials for exploration; Jundong (easterm Junggar) area and around W ulungu depression are not "dead areas of hydrocarbon generation", they should be regarded as fav orable backup positions of prospecting. References | Related Articles | Metrics

Stress Field Characteristics of Structures in Santanghu Basin LI Wei-min, ZHANG Kao-wen, REN Hong, CHANG Yu-qin 2005, 26 (1):  6-9.  Abstract ( 76 )   PDF (2492KB) ( 241 )   Save Host formation in Santanghu basin is made up of Permian foreland basin superimposed with Mesozoic depression basin. It is considered that Santanghu basin was in a south-north compressional stress environment from Hercynian to Y anshanian stages, and the regional stress field was nearly south-north by analysis of the palaeostructural trackway patterns of Permian and Mesozoic. In Hercy nian gional stress field was nearly south-north by analysis of the palaeostructural trackway patterns of Permian and Mesozoic. In Hercy nian stage, the compressional stress field changed into rotational shear stress field in Malang sag, and thus led to the creation of brush structural sy stem, due to the nuclear column efect of Chahaquan swell. In Yanshanian stage, the nearly parallelogram boundary of Tiaohu sag made the nearly south-north regional stress field tur into a normal shear one, hence an en echelon structural system formed at the north slope of the sag. The southern margin of the basin has always been in a frontal belt of north-east positive pressure since Hercy nian stage ,so many huge decollement faults and s series of gliding nappe systems with single-row or superimposed styles developed. In the southern margin of Ma lang sag, several superimposed gliding nappe systems exist in the Permian strata beneath Baiyishan Carboniferous nappe, forming striangle structural belt. W ith abundant faults and fractures, the triangle belt could be a favorable area for fractured reservoirs. References | Related Articles | Metrics

Non-Structural Traps and Favorable Prospecting Areas in Taibei Sag, Tuha Basin CHEN Xu, LI Xin-feng, ZENG Chao-run, PEI Dong-qi 2005, 26 (1):  10-12.  Abstract ( 80 )   PDF (2364KB) ( 226 )   Save The middle and shallow strata of Taibei sag in Tuha basin have entered into prospecting stage of non-structural reservoirs, so it is meaningful for in-time study of the non-structural traps to select targets and ascertain major directions for petroleum exploration. The comprehensive analysis of sequence stratigraphic framework in this sag by applying sequence strati graphy and slope break theory suggests tural traps. The results show that there exist two types or four kinds of lithologic and stratigraphic traps in middle and shallow strata of Taibei sag, where Putaogou structural belt in north slope of Huoyanshan, Subashi and Lianmuqin nose-like uplifts in southern margin of Shengbei sub-sag, central part and south slope of Qiudong sub-sag, Gedatai and Hongtai nose like uplifts in southem margin of Xiaocaohu sub-sag are the most promising domains for petroleum prospecting. References | Related Articles | Metrics

Geophysical Field and Deep Geologic Features in Qaidam Basin WU Guang-da, GE Xiao-hong, LIU Yong-jiang, REN Shou-mai 2005, 26 (1):  13-16.  Abstract ( 80 )   PDF (2386KB) ( 248 )   Save The characteristics of gravity, magnetic and geothermal fields in Qaidam basin are analyzed. According to the information of geophy: sical field, the basin's sedimentary structure, regional structural framework and deep geologic feature are discussed, providing scientife bases for the petroleum ex ploration, widening applied domains of non-seismie geophysical information. These could be as a guide to other oil-gas bearing basins' prospecting and studies in regional tectonics and basinal correlations. References | Related Articles | Metrics

Optimal Discrimination and Well Log Response of Biohermal Reservoir in W estern Qaidam Basin WEN Zhi-feng, ZHONG Jian-hual, WANG Fang, LI Yong, WANG Hai-qiao, GAO Jian-bo 2005, 26 (1):  17-20.  Abstract ( 89 )   PDF (1690KB) ( 234 )   Save The biohermal reservoirs with superior quality, wide distribution and higher reserves have been discovered in recent years in westermn Qaidam basin, mainly including algal reefs, stromatolites and thrombolites, based on field survey and classifications at home and abroad. Some lacustrine bioherms are also found, but not even in distribution and varied in thickness, hence hard to be explored and developed with traditional ways. This paper reviews the log responses of various types of bioherms using core and well log data, and proposes the features of logs suitable for these biohermal reservoirs. Also, fllowing the digital processing of these logs, the optimal discrimination functions for determination of different types of bioherm reservoirs are presented by means of optimal partition, cluster and regression methods. The results can be applied to the well log interpretations in order to achieve hghe-ficient and proper exploration and development of the reservoirs in Qaidam basin. References | Related Articles | Metrics

Log-F acies Geological Analysis in Shinan Area, Junggar Basin LIU Yan-rong, SUN De-jie, ZHAO Fa zhan, YU Hong-guo 2005, 26 (1):  21-24.  Abstract ( 82 )   PDF (2960KB) ( 331 )   Save Rapid petroleum sci-tech development nowadays allows well logging geology more and more to participate in analyzing and finding out geologic prospecting targets. The grain size, sandbody, petrophysical property, hydrodynamic intensity and distribution, well log shape and vertical sequence variation are studied. It is suggested that the sedimentary facies of Jurassic Toutunhe formation (J2), the major payzone in Shinan area, belongs to a braided river island deposit with paleocurrent directions of east-south and west-south. The spatial distribution of depositional sandbody is described in this paper. Applying diplogs to reconstruction and interprelation of depositional structural sequences could be to ascertain paleogeographic events or prospecting targets for advantages of well logging. References | Related Articles | Metrics

The control of Paleo-Fluid Potential Evolution to Natural Gas Migration and Acumulation in Yinggehai Basin JIN Bo, LIU Zhen, HE Han-yi, LI Xu-shen 2005, 26 (1):  25-28.  Abstract ( 92 )   PDF (2541KB) ( 298 )   Save The porosity evolutional function controlled by buried depth and time in Y inggehai basin is established, by which paleothickness and paleodepth of the strata are given; and paleopressure of formation is predicted by the model with modifed Pillipone formula, the error correction is then made by using observed formation pressure; finally, the paleo-fluid potential is estimated based on the paleodepth and paleopressure. The comprehensive analysis of fluid potential evolution from petroleum accumulation stage to present indicates that obv ious differences occur in control of the evolution of paleofluid potential and its distribution characteristic to the natural gas migration and accumulation in different areas and different horizons. It is concluded that the natural gas generated from Y inggehai depression area tends to accumulating towards low fluid potential zone, and DF 1-1 structural belt and Yingdong slope belt could be favorable areas for gas accumulation. References | Related Articles | Metrics

Fracture System and Petroleum Distribution in West District of Southern Songliao Basin WANG Jian-gong, WU Ke-ping, WEI Ping-sheng, ZHAO Zhan-yin, PAN Shu-xin, ZHAO Zhi-kui 2005, 26 (1):  29-32.  Abstract ( 100 )   PDF (2603KB) ( 270 )   Save The formation of fracture system in Songliao basin controlled by its evolutionary pattern has influenced flling series and oil-gas distribution during each evolutional stage. According to its origin and features, the fracture system in west district of southern Songliao basin has been classified into growth-like system of faulted stage that controls the formation and development of faulted basin group, spread-like system of depressed stage that controls hydrocarbon accumulation series and distribution and reversed system that allows to remigration of hydrocarbon. The origin mechanism, distribution characteristic as well as the similarity and differentiation in different evo-lutional stages of the fracture system, etc. are systematically reviewed. All of these have improved the reservoir conditions or qualties and been favorable for hydrocarbon accumulation. References | Related Articles | Metrics

An Experimental Study of Episodic Oil Migration HOU Ping, LUO Xiao-rong, ZHOU Bo, ZHANG Nai-xian 2005, 26 (1):  33-35.  Abstract ( 102 )   PDF (2367KB) ( 369 )   Save The oil migration experiment was made in water-saturated and glass bead-filled glass plate model injected with dye kerosene in order to observe the preferable pathway of kerosene migration and its change in episodic oil-packed process. The results show that after formation of the preferable pathway, the oil remigration always follows after the original pathway and the pattern and configuration of mi-gration normally keep the way; at the same injected rate, the frontal average rate of oil remigration is faster than that of primary migration,and the remigration rate assumes direct correlation to the injected rate; the post-remigration pathway becomes narrow and shrink, oil satu-ration declines, but the original oil migration pathway recurs from the remained oil traces. References | Related Articles | Metrics

On Petroleum Migration and Accumulation of Che-Guai Area in Junggar Basin CUI Bin-fu, WANG Hai-dong, KANG Su-fang, DING Jing, GUO Xiao-yan 2005, 26 (1):  36-38.  Abstract ( 83 )   PDF (2543KB) ( 232 )   Save Che-Guai area in Junggar basin is long-temm in favorable directional zone of hydrocarbon migration in three major source sags.The well developed faults and traps in this area are characterized by multi- source and multi-stage hydrocarbon accumulations. The oil source study shows that there exists obvious regularity for source rock distribution. This paper presents the characteristics of petroleum migration and accumulation in different stages in each zone of Che-Guai area as follows: Hong-Che faulting is originally activated in late Hereynian movement and ceased till middle and late Y anshan movement, which plays destructive roles in early petroleum accumulation (before Early-Middle Jurassic) and sealing roles in late petroleum accumulation (at end of Early Cretaceous). It is concluded that bright prospects appear to be in the south section of Hong-Che fault belt and its slope of the lower wall as well as Shamenzi nose structure of Jurassic system, except for high risks for exploration of Cretaceous and Carboniferous in Chepaizi uplift area. References | Related Articles | Metrics

Reservoir Geochemistry in Jiuxi Depression HU Yong, ZHANG Da-jiang, YU Xing-he, CHENG Ke-ming, XI0NG Ying, YANG Zhi-ming 2005, 26 (1):  39-43.  Abstract ( 67 )   PDF (3544KB) ( 206 )   Save Reservoir geochemistry theory and methods are applied to classifcation of oil family, study of source rock 's hydrocarbon-gener- ating history and analysis of petroleum migration direction in Jiuxi depression. Study shows that the crude oils from six fields in this de- pression belong to the same oil family which could further be divided into three groups of mature, high mature and low mature oils; the oil threshold depths of source rocks in its three sub-sags (Qingnan, Shibei and Dahongquan) range from4 150 m, 3000 m and 3300 m, re- spectively. The crude physical parameters and carbazole parameters in nitrogenous compounds indicate that the direction of Jiuxi petroleum migration should be from west toward east, ie, Qingxi field- →Yaerxia field-→Laojunmiao field- →Shiyougou field, while Shiy- ouhou and laojunmiao fields also have vertical petroleum migration with directions from botom to top, i.e., from L layer to K layer. References | Related Articles | Metrics

Oil Maturity in West Slope Area of Dongpu Sag LI Lin-qiang, LIN Ren-zi 2005, 26 (1):  44-46.  Abstract ( 79 )   PDF (2864KB) ( 285 )   Save The crude oils in Huzhuangji and Qingzuji oilfields in west slope area of Dongpu sag are mainly distributed in Ertaijie struc- tural belt between Changyuan (placanticline) fault and Shjaji fault, with characteristics of low content of saturated hydrocarbons, high content of wax and weight carbon isotope. The GC-MS analysis results show that the isomer ratio of C2 sterane and the ratio of tris- norhopene w(Ts)Vw(Tm) are generally low and similar with the distributing scope of typical low maturity of crude in other basins in China. Also, in aromatic hydrocarbons, the biomarkers reflecting low maturity stage, such as alkyl thiophenes, tetrahydronthiophene and dehy- droxytocopherol series compounds, are detected. Comprehensive analysis indicates that the crude oils found in Huzhuangji and Qingzuji oilfelds are all in low maturity rather than in maturity. References | Related Articles | Metrics

Using Fluid Inclusion to Determine Gas Accumulation Stage of Neopaleozoic in Shenmu Area, Ordos Basin LI Ming-rui, ZHANG Qing, SUN Liu-yi, LIU Xin-she 2005, 26 (1):  47-49.  Abstract ( 79 )   PDF (2229KB) ( 227 )   Save The analysis of fuid inclusions from 7 wells (e.g. Shen-3 Well) in Shenmu area, Ordos basin and the discussion about the phase state and passage of gas migration during the formation of Neopaleozoic Upper Shihezi and Shiqianfeng gas pools and the accumu-lated time in this area are made, according to the structural history, deposition and buried history, thermal evolution history and hydrocar-bon-generating story. Study shows that three times of gas migration from Farly Jurassic to Late Cretaceous take place in Upper Shihezi and Shiqianfeng formations, of which the second migration of end of Late Jurassic- -start of Early Cretaceous and the third migration of end of Early Cretaceous-start of Late Cretaceous play great significant roles in the gas accumulations here. The phase state of migration is dominated by the mixed phases. References | Related Articles | Metrics

Oil Maturity in West Slope Area of Dongpu Sag LI Lin-qiang, LIN Ren-zi 2005, 26 (1):  50-53.  Abstract ( 76 )   PDF (3198KB) ( 202 )   Save The crude oils in Huzhuangji and Qingzuji oilfields in west slope area of Dongpu sag are mainly distributed in Ertajie struc-tural belt between Changyuan (placanticline) fault and Shijiaji fault, with characteristics of low content of saturated hydrocarbons, high content of wax and weight carbon isotope. The GC-MS analysis results show that the isomer ratio of C2 sterane and the ratio of tris-norhopene w(Tsy)wv(Tm) are generally low and similar with the distributing scope of typical low maturity of crude in other basins in China.Also, in aromatic hydrocarbons, the biomarkers reflecting low maturity stage, such as alkyl thiophenes, tetrahydronthiophene and dehy-droxytocopherol series compounds, are detected. Comprehensive analysis indicates that the crude oils found in Huzhuangji and Qingzuji oifelds are all in low maturity rather than in maturity. References | Related Articles | Metrics

Comprehensive Reservoir Evaluation of Zao-V Oil Measure of U pper Kongdian Formaiton in Shengjiapu Oilfield WU Jun-chang, YIN Wei, WANG Zhuo, GUO Feng 2005, 26 (1):  54-56.  Abstract ( 77 )   PDF (1750KB) ( 225 )   Save A comprehensive evaluation of Zao-V oil measure of Upper Kongdian formation in Shengjiapu oilfeld in aspects of rock type, petrophysical property, pore structure and heterogeneity is made, based on analyses of core thin-section, cast thin-section and capillary pressure parameters, together with well log interpretations. Study shows that the rock type of Zao-V oil measure is mainly lithic feldspartharenites, secondly feldsparthic sandstone and lithic feldsparthic greywacke, with medium porosity and permeability; the petro-physical property is controlled by sedimentary microfacies, median size and shale content, etc. It is concluded that Zao-V oil measure is of distinct plane, inter-layer and inner-layer heterogeneities, and could be classified into four types of reservoirs, of which type-II and type-III are the major reservoirs, and type-II reservoir is the best in quality. References | Related Articles | Metrics

Sedimentary Facies of Chang-6 Member of Y anchang Formation of Upper Triassic in Jing'an Oilfield LI Bin, ZHU Yong-ming, GUAN Y ing-zhu 2005, 26 (1):  57-61.  Abstract ( 69 )   PDF (4685KB) ( 360 )   Save Based on 5 profiles and 17 wells' core data, integrated with reservoir lithology, depositional structure and grain size analyses,the polycyclic sequence stratigraphic classification of Chang-6 member is made, and the isochronal formation correlation framework of different time scales is established. By analysis of the sedimentary facies in plane through going feature, it is recognized that Chang-6 member of Y anchang formation of Triassic in Jing an oilfield belongs to lacustrine delta system which is dominated by delta front sub-facies. The effect of sedimentary facies on reservoir physical property is discussed. It is concluded that well developed depositional microfacies as channel mouth bar and underwater distributary channel are premium petroliferous sandbodies and provided with the geologic conditions for forming largescale reservoirs. They should be considered as targets for futher petroleum exploration. References | Related Articles | Metrics

Diagenesis of Triassic Reservoir in Arkekule Area, Tarim Basin LIU Chen-sheng, TIAN Yong-qiang, GUO Jian-hua 2005, 26 (1):  62-64.  Abstract ( 60 )   PDF (2636KB) ( 242 )   Save The petrophysical property of Triassic reservoir in Arkekule are in Tarim basin is controlled by sedimentary facies, with the better of the middle oil layer and the poor of the upper oil layer as well as sandstone of medium throat radius. The porosity of sandstone reduces by about 25%, due to influences of cementation and compaction (sorting and diagenesis), whereas the porosity of Triassic reservoir increases by about 12% for dissolution. It is concluded that the diagenesis stage has been up to stage-B of late diagenesis. References | Related Articles | Metrics

Evaluation on Distribution of Structural Fractures of Feixianguan Formation in Shaguanping Gas Field of Eastern Sichuan ZHANG Yin-de, ZHOU Wen, YI Xiang-yi, QI Hua-zhong 2005, 26 (1):  65-67.  Abstract ( 70 )   PDF (1964KB) ( 227 )   Save According to core and conventional log data from Feixianguan formation in Shaguanping gas field, the fractural development and possible distribution on well profile in studied area are identified, the parameters about fractures are estimated and evaluated. The results show that there exist vertical and oblique fractures of tectonic origin as well as shale-packed fractures of diagenetic stage. The vertical fractures are as effective and structural ones with uneven development degrees. Hence, the structural fracture distribution in studied area has been predicted and evaluated by applying the principal curvature for structural deformation. Study shows that developed fractures should be found in locations of big deformation and high curvature such as structural axes, structural high and structural nose, etc. References | Related Articles | Metrics

Lacustrine Turbidite Deposit and Evolution of Third Member of Shahejie Formation in Bo'nan Oilfield LI Xiao-mei 2005, 26 (1):  68-70.  Abstract ( 83 )   PDF (2742KB) ( 204 )   Save The conceptual framework establishment of turbidite depositional system, which includes turbidite complex, turbidite system,turbidite stage and sub-stage as well as turbidite beds, facilitates temporal and physical correlation exactly among marine turbidite deposits in different areas. W hen the framework is introduced into the halfgraben-like fault lacustrine basin, the continental turbidite deposit of its side of ramp is found to be more different than the marine turbidite deposit in terms of control factors of sedimentary evolution. The turbidite system and turbidite stage of the marine deposit are mainly controlled by relative change of sea level, while those of the continental fault lacustrine basin controlled by the tectonic subsidence and the change of debris flux, respectively. References | Related Articles | Metrics

Layer Correlation and Classification of Dongying Formation in Gaochentou Area, Dagang Oillield WU Min, SU Yi, LI Yun-xiu, WANG Xin, HE Xin-rong, YI Ji-gui 2005, 26 (1):  71-72.  Abstract ( 72 )   PDF (4923KB) ( 201 )   Save The detailed corltions of vertical control step by step from quasi-sequence series, quasisequence to substratum in Dongying formation of Caochentou area are made, and the model for well to well eorrelation and matrix profile expanding spread is developed. Three quasi-sequence series are cassified from Dongying formation, of which the major oil-gas bearing zone ( Dong- I section) is divided into seven sand layers with oil and gas discoveries except for No. 7 sand layer. These could be as a powerful guide for petroleum explo ration and development in this area. References | Related Articles | Metrics

Application of Thermal Fluid Field-Percolation Field Simulation to Perforated Completion LIAN Zhang-hua, MENG Ying-feng, ZHU Jian-hua 2005, 26 (1):  73-76.  Abstract ( 72 )   PDF (2417KB) ( 226 )   Save 3D finite element model for thermal fluids of perforated completion and open hole completion is developed by using thermal fluid field for simulating percolation field in perforated completion. The material with same thermal conductivity is adopted to make well-bore and perforated hole simulation. When the thermal conductivity of material is infinite to that of formation model, the simulation of whole percolation fields of perforated completion can be performed. Based on the models, this paper also studies the flowing velocity within perforated hole, boundary flowing velocity beyond compacted zone, flowing pressure field, full hole producing rate and productivity ratio under some perforated depth, with or without driling fluid pollution and compacted zone. The novel method could be helpful to opti-mized design of perforated completion and prediction of productivity. Also, it is of more practical significance for evaluation of perforated completion. References | Related Articles | Metrics

Facies-Controlled Modeling for Mature Oilfield Development LU Xiao-guang, ZHANG Yong-qing, CHEN Bing 2005, 26 (1):  77-79.  Abstract ( 78 )   PDF (2299KB) ( 219 )   Save Facies-controlled modeling facilitates great improvement of accuracy of reservoir model. Based on speeific characteristics of techniques and information from mature oilfield development, the research thought, method and key procedure of integrating depositional! microfacies modeling with facies controlled reservoir parameter prediction are proposed. A case study is made for low sinuosity of distributary channel sandbody. The result shows that compared with conventional reservoir parameter prediction, the facies-controlled model-ing has greatly promoted the conversion of geological concept to the model, bringing about more reliable and matched in-situ conditions.The study will be beneficial to employing the knowledge, experience and skill from a geologist, intensifying restriction in geology so as to better fit the practical conditions of domestic reservoir characterization for mature oilfield development. Meanwhile, integrating deposi-tional microfacies modeling with stochastic reservoir parameter prediction is advisable or recommended for further modeling practices. References | Related Articles | Metrics

Application of Genetic Algorithm to Optimized Oilfield Development LI Xiao-ming, ZHANG Lie-hui, ZHOU Hong 2005, 26 (1):  80-82.  Abstract ( 110 )   PDF (1800KB) ( 363 )   Save Conventional optimizing techniques are often not adopted due to being unable to properly deal with muli-variable optimization and due to possibly discontinuous and non-differentiable objective function. Also, regular well patterns appear to be more risky to use for lacking of flexibility. In view of these issues, this paper suggests that genetic algorithm can be applied for well pattern and well number optimizations in order to get maximum cumulative production and best economic benefits. Study shows that this technique is certain of effectivity. References | Related Articles | Metrics

Productivity Well Test for Gas Condensate Well Considering Retrograde Condensate Effect QIN Bin, LI Xiang-fang, CHENG Shi-qing 2005, 26 (1):  83-86.  Abstract ( 88 )   PDF (2398KB) ( 217 )   Save Numerous theoretical analyses and field applications indicate that relative permeability to gas near wellbore area declines rapidly due to precipitation of retrograde condensate fluid, which will result in great changes of inflow performance of gas condensate wells. The retrograde condensation impact tends to be unavoidable because the phenomenon that bottomhole producing pressure is lower than dew point pressure is easy to be found in productivity well test. However, the impact is seldom considered in present productivity well test technology. Consequently, the slope of indication curve often shows negative and the productivity equation is unable to be effectively applied for production performance analysis. In view of this issue, this paper analyzes the effect of choke size change on permeability in detail, demonstrate that the reasonable selection of choke size is of great significance to productivity analysis, and firstly proposes that the usage of curves between coefficient from pseudosteady-state productivity equation and bottomhole producing pressure is convenient to analyze the inflow performance of gas condensate wells correctly. Case study proves that the proposed method is contibuted to properly establish the inflow performance relationship (IPR) for gas condensate wells. References | Related Articles | Metrics

Theoretical Study and Application of Well Inflow Performance Relationships GAO Wen-jun, YIN Yong-guang, HU Ren-quan, ZHANG Zhong-jin 2005, 26 (1):  87-89.  Abstract ( 83 )   PDF (1811KB) ( 230 )   Save This paper analyzes the KroBoμo function form, establishes its general functional relations to pressure, from which obtains the well inflow performance equations and general formula in saturated and unsaturated reservoirs. These equations can either be inverted into classical Vogel and Fetkovich equations or into generalized Vogel one under some condition. Their theoretical and universal properties are demonstrated in oilfeld application study, and the results are reliable and good for popularization. References | Related Articles | Metrics

The Technical Limits for Recovery of Hutubihe Reservoir in I uliang Oilfield ZHANG Hui-yong, WANG Yan-jie, XIA Lan, WANG Zhao-feng, HE Jin-yu, MAI Xin 2005, 26 (1):  90-92.  Abstract ( 89 )   PDF (1421KB) ( 204 )   Save Taking Hutubihe reservoir in Luliang oilfield of Junggar basin as an example, this paper presents an analysis of development performance of the reservoir with low - amplitude, multi-sequence, edge-bottom water and "one sand layer as a reservoir" characteristics, an optimized parameters study of the key factors such as formation pressure, bottom hole pressure, mass production, injection pressure and recovery processes or development schemes integrated with production performance and using reservoir engineering and numerical simulation methods, and proposes the technical limits for reasonable recovery of Hutubihe reservoir. It provides reliable technical supports for long-term stable production and high-yield development of this reservoir. References | Related Articles | Metrics

The Variation of Associated Gas Production in Tuha Oilfield WANG Qian, WANG Xiao-dong, GAO Jing-wen, CHEN Yu-hua, TANG Xi-ming, HU Ren-quan 2005, 26 (1):  93-95.  Abstract ( 140 )   PDF (1985KB) ( 218 )   Save This paper presents the all-around investigation and analysis of production status, production capability and production level of associated gas in major fields of Tuha region, of which many methods are used to study the variation of associated gas and relations of production GOR to pressure and water cut, etc. These reliable parameters can be helpful to preparing the natural gas development plan of this region. Study shows that the GOR changes could be affected by the changes of formation pressure, recovery process and water cut in turn. Therefore, the scheme of production with keeping formation pressure should be unalterable. References | Related Articles | Metrics

New Way to Improve Seismic Data Processing with VSP LI Wen-jie, WEI Xiu-cheng, LIU Yang 2005, 26 (1):  96-98.  Abstract ( 96 )   PDF (1427KB) ( 212 )   Save In view of the fact that seismic data are hard to exactly reflect seismic wavelet traveled from strata of various depths and to get precise deconvolution operator due to serious disturbance in surface receiver and greater decay and absorption, VSP logging is adopted, picking-up the operator from it, and applied the deconvolution processing of post-stack seismic data. Results show that this technique can be used to remarkably improve the resolution of post-stacked profile, continuity of event and intensify wave impedance in order to finally improve the quality of post-stack processed profile. References | Related Articles | Metrics

Application of Micromatter Trace Test to Glutenite Reservoirs LI Chen, FANG Zhi-bin, LIU Chun-lan, FENG Xue-zhang, WANG Kun, MA Han 2005, 26 (1):  99-101.  Abstract ( 56 )   PDF (806KB) ( 204 )   Save In early stage of glutenite reservoir development, it is hard by using conventional dynamic monitoring data to interpret and grasp such issues as direction of reservoir heterogeneity, flowing regularity and availability of injected water, existence of high ermeability zone, efect of fault on water injection, well response, residual oil saturation in high-capacity channels, etc. For these reasons, the micromatter trace tester was introduced in 2002 for its simple and feasible procedure and being independent of reservoir depth, reservoir quality and fluid property. The tracer test has been run in four well groups of complex glutenite reservoirs of Upper W uerhe formation of East District 5-(3) in Karamay oilfield, and the results are in accordance with the actual situation. The interpreted and ascertained percolation and sealing fault in the reservoirs can be as a guide for field injection-production efforts and as a solid basis for further development and adjustment. References | Related Articles | Metrics

Study on Fault Sealing with Synthetic Fuzzy Judgment——An example of Chenbao area in Gaoyou sag YANG Yong, QIU Yi-bo, ZHA Ming 2005, 26 (1):  102-104.  Abstract ( 72 )   PDF (1727KB) ( 225 )   Save A quantitative evaluation of the fault sealing of Chenbao area in Gaoyou sag is made by applying synthetic fuzzy judgment integrated with shale smear factor method. The results are in accordance with actual situations from exploration. Study shows that great differences of fault sealing in different positions occur for such major faults as Wu-1 and Wu-2, with characteristic of deep opening and shallow closing, becoming the main passages for hydrocarbon migration and effective sealing for hydrocarbon fugitive emission. For the minor faults, they tend to forming fault-sealed reservoirs in it due to their good sealing properties. References | Related Articles | Metrics

The Situation, Demand and Countermeasures for Natural Gas Resources in China HUANG Ping-hui, ZHANG Shu-ying, QIN Qi-rong, DAI Can-xing 2005, 26 (1):  105-107.  Abstract ( 118 )   PDF (780KB) ( 285 )   Save The statistics and expatiation of gross resource amounts, distribution, proved reserves and utilization of natural gas in China show that China is rich in gas resources, but the per capita amount of the resources is far below the average of the world. Their extremely uneven distribution allows to be found mostly in central and northwestem China and its coastal continental shelves nowadays, of which the discovery in eastern China is higher than that in westem China for the reasons of great buried depth, big difficulty of development and low proved degree. The natural gas accounts for low proportion of domestic energy consumption and is mostly used as industrial fuel and city gas and in chemical industry and power station. The prediction of future demand and supply of natural gas suggests that China needs for importing natural gas in future. A series of countermneasure are proposed in order to deal with these issues. References | Related Articles | Metrics

Origin of Low Structures in Central Sichuan Area QIN Qi-rong, SU Pei-dong, LI Le, LIU Li-ping 2005, 26 (1):  108-111.  Abstract ( 118 )   PDF (2745KB) ( 580 )   Save The origin of structures in central Sichuan area is discussed according to its structural characteristics and the regional tectonic setting of Sichuan basin. It is considered that the structure in central Sichuan area are formed under the regional tectonic stress of Sichuan basin and the local stress derived from the basement structure and different properties during Himalayan tectonic movement. It could be divided into such two stages as the early S-N compression stage and the middle-late NE- -SW compresso-shear stage. References | Related Articles | Metrics

Prospects for Exploration of Coal-Bed Gas with Low Coal Rank in Tuha Basin CHEN Hong-liang, LI Qiao-mei, WANG Rui-ying, ZHOU Yu-zhong 2005, 26 (1):  112-114.  Abstract ( 89 )   PDF (1418KB) ( 259 )   Save The correlation of coal-bed gas accumulations between Tuha basin and Powder River basin is made. The reason for successful exploration of coal-bed gas with low coal rank in Powder River basin is that the real gas concentration in the high-permeable coal bed is much higher than measured gas concentration. According to superior conditions in Tuha basin, both free gas and adsorbed gas should be highlighted during its coal-bed prospecting. Meanwhile, the evaluation of three major blocks is made, and Y-1 W ellblock is ascertained to be the most favorable target among them. References | Related Articles | Metrics

Cyclic Changes of Petrochemical Property with Stratigraphic Time Yu.M.Polyschuk, I.G.Yaschenko 2005, 26 (1):  115-117.  Abstract ( 90 )   PDF (2666KB) ( 203 )   Save Based on mass data analyses, the changes of sulfur, paraffin, colloid and asphaltene contents of crude oil in profile are studied.The results indicate that these parameters in profile change closely with geotectonic cycles as follows: sulfur, colloid and asphaltene contents keep the lowest values in Devonian, Triassic, Jurassic and Tertiary; they are in accordance with regressive geotectonic phases, of which the maximum values appear to be correspond to the largest-scale marine transgress ions occurred in Caledonian cycle, Hercynian cycle and middle phase of Alpine cycle. Related Articles | Metrics