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01 March 2000, Volume 21 Issue 2 Previous Issue    Next Issue

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Analysis of the Dynamic System for Forming Reservoirs in Lunpola Basin(Tibet) Zhang Keyin, Mu Zehui, Zhu Hongquan, Ai Huaguo, Feng Fang, Luo Yu 2000, 21 (2):  93-96.  Abstract ( 75 )   Save There might be three periods of oil generation in Lunpola basin's hydrocarbon source rocks(Tibet), accordingly forming reservoirs by three-period flling-up process. The paths for hydrocarbon migration were dominated by faulting, unconformity, pores or fissure network system, where the driving forces for oil/gas migration would be abnormal high pressure(Niubao formation depositional period) and hydrostatic pressure(Dinqing lake formation depositional period). The reservoir-formned dynamic system could be divided into lower self-source enclosed type,middle allo- source to self-source semi-full enclosed type and upper allo-source semi-open enclosed one. The study showed that in Pagela flexure zone,south slope of Pacuo sag,south slope of Jiangriacuo and Luomadiku zone,the exploration should focus on petroleum reservoir with self source enclosed dynamic system for forming reservoirs, while in northern Hongxingliang-Di 'e2ong and Luomadiku areas,on the reservoir with middle allo-source -self-source semi-full enclosed dynamic system for forming reservoirs, and pay attention to searching for the reservoirs with upper allo-source semi-open enclosed dynamic system. References | Related Articles | Metrics

The Relations Between Structural Stress Field and Hydrocarbon Migration and Accumulation in Southern Margin of Junggar Basin Wu Xiaozhi, Wang Lihong, Song Zhili 2000, 21 (2):  97-100.  Abstract ( 106 )   Save An analysis of piedmont structures and ground stress field in southerm margin of Junggar basin is made in this paper. It is suggested that the major factors restricting the exploration progress would include the complex structure, deep objective interval,and intensity of ground stress that mainly concentrated on the mudstone member of Anjihaihe formation,which is characterized by high pressure and undercompaction with NNE orientation of maximum major stress and big difference between two horizontal stresses. This often causes drilling damages in this area. The ground stress distribution within southerm margin of Junggar basin assumes that its compressing stress increases vertically with depth and . compatible with the structural layers, which can be divided into deep compressive belt,medium shear zone and shallow tensile fracture belt. The migration of hydrocarbon tends to take place from high pressure stress distribution area(hydrocarbon generation sag) towards low pressure stress distribution area(uplift). The piedmont, a compressive ground stress area, contains oil/ gas pools dominated by structure formed reservoirs. It is shown that deep abnormal high pressure confined area(abnormal pressure fluid compartment) at footwall in southern margin of the basin and uplift sector closely related to faulting should be as a domain or direction for exploration,and structural traps (like faulting barrier, anticline, etc.) along with original oil/ gas reservoirs at major faulting footwall as the main exploratary targets. References | Related Articles | Metrics

The Petroleum System and Objective Interval for Exploration of Cambrian in Southwest Depression of Tarim Basin Qu Qiuping, Tang Yong, Wang Haidong, Lan Wenfang 2000, 21 (2):  101-104.  Abstract ( 92 )   Save The study of evolution of paleostructural framework and the analysis in combination with the thermal evolution history of hydrocarbon source rock and petroleum migration and accumulation history were made, by which the Cambrian petroleum system was firstly clssified. Based on known resen oir-forming processes and trap- formed period, the critical event and critical timing for shaping a petroleum system were determined. The petroleum system assumes complex combinations vertically and horizontally compared with the others. This paper suggested that the most favorable zones for oil gas exploration would be Qunkuqiake and Mazatag torsional and folded belts, and the major prospecting objective might be Haimixi anticline in Haimitag structural belt, the secondary one be Jiedong fault-nose within Cambrian “salt base" trap in west end of Bachu uplift. References | Related Articles | Metrics

Review and Prospect for Petroleum Exploration in Hinterland of Junggar Basin Zhang Yueqian, Zhang Nianfu, Yao Xinyu 2000, 21 (2):  105-109.  Abstract ( 120 )   Save Since the early 1980's,when large-scale petroleum exploration activities began in hinterland of Junggar basin, we have got plentiful and substantial results in exploration. Three large- and medium-sized oil and gas fields have been discovered, including many petroliferous structures. The recognition of rules for hydrocarbon enrichment has also emerged a leap to“uplift accumulation theory”from“source control theory”. The authors established a model for oil/ gas reservoir formation by clues of the exploration course in hinterland of Junggar basin, characteristics of petroleum migration and accumulation as well as reasons for success and failure in this area, and proposed some suggestions for further exploration,based on existing conditions and state of the arts for petroleum prospecting. This paper is, on the basis of petroleum system theory, continuous to support these“theories" as a guide for searching for oil/ gas. References | Related Articles | Metrics

The Characteristics and Petroleum Distribution Along Chenjia Reverse Fault in Lengjia Area of Liaohe Basin Luo Qun 2000, 21 (2):  110-113.  Abstract ( 106 )   Save By using a method of history-causation analysis and beginning with the regional structure framework,this paper makes a classification of Chenjia reverse fault into four types of faulting systems,recogmizing corresponding four sorts of faulting origins and establishing four kinds of faulting developed models. According to these and the theory of hydrocarbon reservoir formation, the effect of faulting in this area on controlling oil/ gas migration, accumulation and reservoir formation is approached along with the reservoir distribution models. Finally, the mechanisms for eight sorts of petroleum reservoir formation are outlined. References | Related Articles | Metrics

The Techniques for Deep Seismic Data Processing in Liaohe Basin Mi Xue, Xu Su, Chang Hanzhang, Li Zhun, Liu Dongqi, Xu Rongcai 2000, 21 (2):  114-115.  Abstract ( 85 )   Save The deep seismic data from Liaohe basin assumed indistinct reflectance signature and poor accuracy of signal/ 'noise ratio and migrated imaging. For improving signal/ 'noise ratio, such techniques are applied as amplitude compensation, pre-stack noise removal, residual static correction, multiple rejection and post-stack noise removal. For enhancing the migrated imaging, these techniques, like DMO, migration velocity field smoothing and pre-stack depth migration, are used. By means of these processing techniques, both signal/ signal ratio and migrated imaging accuracy have been obviously enhanced, this making the quality of deep seismic data improved greatly. References | Related Articles | Metrics

Characteristics of Cretaceous Petroleum System in Yiyang Basin, Jiangxi Province Zhou Songyuan 2000, 21 (2):  116-119.  Abstract ( 78 )   Save In Cretaceous petroleum system of Yiyang basin,the hydrocarbon source rock is grey-block mudstone of Lengshuiwu formation, which mostly contains kerogen Type I and H , higher abundance of organic matter, and belongs to a source rock of fair average quality with extensive distribution in area and medium maturity. I ate Cretaceous to present are believed to be its periods of generation, expulsion (concentrated in Yingtan sag and Guixi sag) and accumulation of hydrocarbons. The amount of resources is estimated at 0.8327x 108 t~1.0899x108 t. The reservoir bodies are mainly sandstones located in lower and upper Lengshuiwu formation and lower Zhoujiadian formation. The cap rocks are mudstone in middle Lengshuiwu formation and upper Zhoujiadian formation, and the latter, especially, can be as a regional cap rock. The hydrocarbon migration took place vertically and dominantly by the faults and fractures. This study showed that the two major source sags, Yingtan sag and Guixi sag will be prospecting targets for oil/ gas exploration. References | Related Articles | Metrics

Characteristics and Origin Analysis of Dolomite in Lower Ordovician of Tarim Basin Gu Jiayu 2000, 21 (2):  120-122.  Abstract ( 166 )   Save There might be two major stages in dolomite distribution throughout geologic history of Tarim basin,that is, Mesozoic and Early Paleozoic, The dolomite of Cambrian-Ordovician could be clasified into seven types by its structures. The following big differences display its variations in origin, such as carbon and oxygen isotope value, trace element content and inclusion homogenization temperature range. Based on lithology, carbon and oxygen isotope value, trace element content and diagenetic temperature, it can also be classified as penecontemporaneous dolomite,shallow buried dolomite and deep buried dolomite. References | Related Articles | Metrics

Depositional System and Subtle Reservoir in Central Uplift Belt of Dongying Sag Sun Longde 2000, 21 (2):  123-127.  Abstract ( 67 )   Save The studies were systematically made on well- developed major reservoir member, Shahejie fornation depositional system in central uplift belt of Dongying sag (Shandong Province). It is shown that in Shahejie formation there mainly exist three types of depositional systems(delta deposit, underwater fan deposit and coastal lake deposit) and eight sorts of reservoir deposits with different features for each one. Based on these and followed by proper reservoir classification and characteristics analysis,this paper established the methods for reservoir description of subtle pool with complex fault blocks, by which the main trap within the belt could be divided into fault block trap, structural trap and subtle trap which includes sand lens trap,lithologic updip thinning out trap,structural-lithologic trap and fault lithologic trap. For self- confined fault controlling oil flow,its height of oil column can be estimated by utilizing R.R.Rerg's principle. These would be of significance for reference to study of similar reservoirs and their characteristics. References | Related Articles | Metrics

Quantitative Description of Anisotropy and Asymmetry by Using Rock Permeability Parameters Li Chuanliang, Kong Xiangyan 2000, 21 (2):  128-129.  Abstract ( 81 )   Save The presence of orientational differences in reservoir rock permeability, called anisotropy, is related to the arrangement of particles that form rocks. Meanwhile, there exists asymmetry in permeability, which is, like anisotropy, related to that of particles, too. According to the basic characteristics in rock permeability , quantitative descrption methods .of these by using different permeability parameters are presented,thus providing useful basis for in-depth study of the reservoir rocks and their oil/ gas percolation. References | Related Articles | Metrics

Calculation Methods of Recoverable Reserves of Oilfields Chen Yuanqian 2000, 21 (2):  130-137.  Abstract ( 238 )   Save Recoverable reserves and remaining reserves of oilfields are naterial basis of oilfield developntent arnd construction. So it is necessary to accurately forecast and determine thenl. Based on our experience in forecasting. r'alculating and calibrating recoverable reserves of oilfields, and requirements in“Standards of Oil and Gas Reserves”tobe revised,this paper presents different methods for forecasting revoverable reserves and remaining reserves of oilfields following induction and sifting. which can be applied to different slagrs of oilfield developncent. 'These methods include analogical method, correlation nethod, displacement efficiency nethod, production decline method, water drive rurve method and forecast model method. References | Related Articles | Metrics

Study on Relative Permeability Curves from Baolang Oilfield, Xinjiang Zhang Renxiong, Mao Zhongyuan, Li Jianmin, Zhang Hong 2000, 21 (2):  138-140.  Abstract ( 94 )   Save The percolation to oil in reservoir rock of Baolang oilfield couldn't start with till a relatively high pressure gradient was formed in it, in the case o{ existence of inreducible water only(no free water). It shows Imnany shapes of relative permeability curves, in which the straight line is comrron. In general, these curves are characterized bv high ineducilhle water saluratiol, low remaiming oil saturation with high relative perimeability and wider two-phase region. It is also shown tlrat the fects of pore-throat combilnation patterns and injected water quality on the relalive penmeability ('urves are (o11sirable. References | Related Articles | Metrics

Study on Modeling Recovery Mechanism of Hongnan Edge-Bot-tom Water Reservoir, Turpan-Hami Basin Wei Shangwu, Li Xudong, Li Hongcheng 2000, 21 (2):  141-143.  Abstract ( 85 )   Save By using numerical simulation method. the rerovery mnechanism and Imajor ge(logic factors and fluid properties affecting production efficiency in Hongnan oilfield with edge-bottom wuter were simulated and estimated. The major geologic factors and fluid properties include sedimentary rhythm, KJ K ratio, crude oil viscosity. oil/ water mobility ratio and water-oil density difference. This study would provide basis for appropriate devlopment of Hongnan oilfeld and taking technical counterrurasures. Also. it could be lsed for reference to siinilar oilfield developnent. References | Related Articles | Metrics

Parameters and Standard for Evaluating Reservoir Rocks in Hainan Structural Belt, Liaohe Oilfield Song Ziqi, Tan Chengqian, Wu Shaobo, Gao Xingjun, Lei Qihong 2000, 21 (2):  144-147.  Abstract ( 95 )   Save By using theory of grey systen1,detailed evaluation of well log data fromn over 30 wrlls in Dongsalnduan reservoir, Hainan structural belt in Liaohe oilfield was made and brought into practice. And from characteristic values of the statistical analysis, their accuracy and resolution factor, this paptr providrd a stries of detailed evaluating paranelers, criteria、weight coefficients and software systems for fair reservoir rocks (Class I and I[) and pour ones (Class I) inl petrophysical property and petroliferous nature in this study ared, including c'oresponding well log paramneters dnd cal(ulation and evaluation of Class I to IN reservoirs and pay zunes. Cornpared with well lest data andl geologic informatioll fro) corresponding intervals,it is indicaled that these evaluation and interpretatiot rosuls have properly anl reliably 1flected the distributions and characlers of main hydrocarbon slrala, thus providing relevan; geologi basis for furher petroleum exploration and development in this structural belt. References | Related Articles | Metrics

The Basic Definitions of Commercial Reserves and Commercial Oil Flow and Their Estimation Methods Dong Guanghua, Bai Hexian, Wang Xiangdong, Wang Jianfeng 2000, 21 (2):  148-151.  Abstract ( 164 )   Save The basic definitions of commereial reserve and cormnercial oil Alow and their estirnating methous have akwavs been a problem to academic cireles of petroleum at home and abroad. This paper proposed relatively practical and basic definitions aboul these by investigation and study of such a information available in th: world. The proposition anld estabhishnnent of estirnating cummercial reservc tool was based 011 generally arcepted present value approach. whereas that of estinating commercial oil flow onl Junggar basins ecomonic evaluation resulls performed for over ten years. esprcially un lts econourice limit given bv studv in recent years. These methods are indlicated to be simple and practical for us And spreading out dndl application of them to all oilfields of domestic petroleunl industr will be of significance. References | Related Articles | Metrics

Application of PSEGY Practical Program to Reservoir Description Fan Changjiang, Hunag Xiaoping, Niu Jinglu 2000, 21 (2):  152-154.  Abstract ( 81 )   Save The PSECY-scrics praetical program wus developed on the denand for reservoir description studirs. which consists of Inore than len independent (-language programns. and runs on workslations like SGI and SUN, It husa mnadin function of making orlglnal srismi: dlutil processing in view of sume lajor probleins. su thal certain geolugic targets would be reached ur found. Following applied in development areras surh as Shanan vilfield, Mobei uilfield, Shiuan oil field arnd Well block J\\ -26 tor reservoir descriptions, it showed remarkable efctiveness for application in geologv and extentsive lissemination values fur its making up for certain weaktesses or inapprupriatenesses appetared in surh introduced softwares. References | Related Articles | Metrics

A Simple Method for Production Decline Analysis Li Fayin 2000, 21 (2):  155-157.  Abstract ( 129 )   Save Based 011 lthte allalyses of Arps production deeline law and changes of remainling resorve-productiot ralio. a simple and convenient letod for estimating de:line factors and recovcrable reservcs during lecline period in d11V oilfield was presented. It is indicatedl thal this ('an be dble lo meet the requirements of actual production. Using this methud. such unreasonable cuses as estinated recoverable reserves are less thal acuinulative producliol or decline factors are bigger than 1, henve causing estimation of the reasonable reservcs lo be invalid ur iusignificanl. ("ould be voidable. Furthermore. the classification of production decline lypes arnd lange of deline faclor values have been approached in this paper. References | Related Articles | Metrics