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01 March 1994, Volume 15 Issue 1 Previous Issue    Next Issue

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EXPLORATION OF THE CONCEALED OIL-GAS TRAP OF TRIASSIC-JURASSIC IN NORTHWESTERN MARGIN OF JUNGGAR BASIN Qiu Dongzhou 1994, 15 (1):  1-9.  Abstract ( 120 )   PDF (710KB) ( 292 )   Save The anticline, fault and other structures of Triassic — Jurassic have not very developed in the southeastern slope zone of the northwestern margin of Junggar Basin. but there are nine types of sedimentary facies, thirty subfacies and nearly one hundred microfacies. They are arid fan. humid fan. braided river, meandering river, anastomosed river. fan-delta. braided delta. lacustrine delta and lacustrine floor fan. etc. The changes of lithofacies are frequent. and there are lots of unstable components and types of diagenesi with greatly changes in the elastic rock. Also. there were well developed stratigraphic pinch out, overlap. and unconformity. which make the area have the essiential geologic conditions that formed the concealed oil-gas trap. There were four types of concealed traps.perhaps existing in Trassic-Jurassic of the lithological trap. paleomorphologic trap and mixed trap. According to analysis of structural and s叫1- mentary characteristics of the northwestern margin in Junggar Basin, there were all concealed oil-gas trap in north and south of Karamay-Wuerhe fault and Wuerhe Xiazigai fault. but the most favorable are should be north slope zone of Manas Lake depression to south of Well Guaill4-Well241--Well Ba.165 —Well134 Well Xia40. References | Related Articles | Metrics

THE CARBONIFEROUS AND PERMIAN AS MAJOR OIL SOURCE ROCKS IN JUNGGAR BASIN Zhao Bai 1994, 15 (1):  10-15.  Abstract ( 152 )   PDF (541KB) ( 273 )   Save On the basis of comprehensively the results of geophysical prospecting, drilling, oil generation along with the strata and oil/gas shows occured in peripheral outcrop areas of Junggar Basin. it is believed that the Carboniferous and Permian act as maior oil source rocks in Junggar Basin. the crude oil found up to now in all sequences of known oil­fields within the basin originated in the Carboniferous and Permian. References | Related Articles | Metrics

INTERPRETATION OF SEISMIC VELOCITY ANORMALY IN SOUTHERN MARGIN OF JUNGGAR BASIN Zhou Xiaoji 1994, 15 (1):  16-21.  Abstract ( 78 )   PDF (513KB) ( 232 )   Save The southern margin of Junggar Basin is the area that developed seismic velocity anomaly in general. By analysing the geologic structures and lithologic characteristics of Fukang fault zone, it is ascertained that layer veloci­ties of enormously thick thrust block (Upper Paleozoic-Mesozoic)and alluvial fan body distributed along the foot of the mountain are very high(>3 900m/s),they were two important factors which formed seismic velocity pitfalls. Con­sidering the characteristics of steepness in lateral seismic velocity variations, the seismic velocity trends in southern margin of Junggar Basin were ascertained using interactive processing for layering to draw velocity sections, thus im­proving processing quality of seismic data and reflecting subsurface structural patterns more correctly. Seismic velocity pitfalls of Well Tai 3 area. Xiaoquangou anticline and Dubei anticline were removed and structural patterns of Dunan anticline and Xihu anticline further determined. It is advantageous to guide oil-gas exploration work in this area. Related Articles | Metrics

ORGANIC PETROLOOIC CHARACTERISTICS AND ASSFSSMENT OF COAL AND TERRESTRIAL ORGANIC MATTER OIL SOURCE ROCK Mang Feiyu, Fu Jiamo, Liu Dehan, He Ping 1994, 15 (1):  22-29.  Abstract ( 134 )   PDF (675KB) ( 444 )   Save Coal, terrestrial organic-rich source rock as well as marine and lacustrine sapropelic source rock are three type of source rocks in geologic bodies, which are characterized by organic matters in source rock significanly dominated by higher plants, being mainly typeⅢ kerogen, and composed of oilprone hydrogen-rich macerals (vitrinite, sapropelic maceral and super-micro liptinite) which control the oil potential and hydrogen poor macerals with no oil potential. Considering the complicated composition and structure of coal and terrestrial organic - rich source rocks, progressive (maceral, submaceral and supermaceral in turn) studies must be undertaken using fluorescent micrscope analysis technique first, combined with reflection and transmission electronic microscope analysis technique, to obtain an accu­rate evaluation of the source rock, Hydrogen-rich components of Jurassic coaly source rocks in Xinjiang are significanly dominated by vitrinite (certain amounts of super-microliptinite exist) and liptinite is comparatively abundant in dull shale. Therefore its oil potential cannot be neglected. References | Related Articles | Metrics

ORIGIN OF HYDROCARBONS AND ITS EXPLORATION IN CAINAN OILFIELD Wang Yutao, Lan Wenfang 1994, 15 (1):  30-36.  Abstract ( 194 )   PDF (483KB) ( 217 )   Save The geochemical analysis and study show that gas from Cainan oilfield is coal-type associated gas, in which gas from Well Cai17 (Badaowan Formation) is possibly coal bed gas and oil generated from coal. The Middle-Lower Jurassic coal measures in Fukang sag are the main source rock. The slope zone in Fukang sag is advantageous area for 011 and gas prospecting. The coal seams in the Middle-Lower Jurassic are advantageous sequences for coalbed gas prospecting. References | Related Articles | Metrics

DISCOVERY AND GEOLOGIC SIGNIFICANCE OF KARAMAY APUS FOSSIL FAUNA Yong Tianshou, Wei Jingming, Yang Ruigi, Li Xiaonan 1994, 15 (1):  37-48.  Abstract ( 409 )   PDF (623KB) ( 309 )   Save A large number of Apus fossils were discovered in Upper Karamay Formation and Baijiantan Formation (outcrop) in Kararnay area. Xinjiang in 1964. According to symbiotic fish fossil, insect fossil and plant fossil, they were separately nominated Kararnay (Late Middle Triassic) and Baijiantan (F.arly Late Triassic) Apus fossil assem­blages. These fossil assemblages were discovered in successions in south πiargin of Junttgar Basin, Tarim Basin, Tur pan Basin and Ordos Basin, and offered a new clue to correlation and classification of the Triassic. Inferred from sedimen­tary lithofacies characteristics. the Apus could be a type of hydrobios in fresh water-brackish water living in clean, transparent, warm and still shallow water area enriched with organic matters, which can be used as facies f咽sils of shallow lake.water-filled swamp.oxbow lake and river-delta environments. References | Related Articles | Metrics

A STUDY OF FEATURES FOR SEVEN DECLINE CURVES Yu Qitai 1994, 15 (1):  49-56.  Abstract ( 287 )   PDF (459KB) ( 394 )   Save The mathematicai representatives of seven decline curves were presented in this paper. By applying a standard chart for a generalized decline type curve, a correlation, analysis and study of features of these decline curves has been made, which shows, ①The Arps decline curve is described using formula of prouction decline as well as anaiytic solution of cumulative production rate. Therefore, it is easy to use them, clear for showing types of decline and popular for application. The generalized decline type curve presented on the basis of it is of a wide coverage. ②The Kopitov and the Matthews decline curves corresponded to the curve of n=0.5 of the Arps' are applicable to a reser­voir by water drive and gravity drainage. ③The Joshi decline curve is equal to the curve of n= 0 of the Arps' (i.e. the exponential decline). ④The Logistic and the Gomperts decline curves are inconsistent with the Arps’. for they all lie in range of n<0 of the Arps decline curve. They are applicable to reservoir with low viscosity under water drive. ⑤The Weible decfine curve is of great changes and wide coverage, even including the Arps decline curve, but it is only described using formula of production decline rather than analytic solution of cumulative production rate. Therefore, its appliction is restrained. References | Related Articles | Metrics

OPTIMAL PERFORATING LEVEL FOR OIL WELLS IN A RESERVOIR WITH BOTTOM WATER Li Chuanliang 1994, 15 (1):  57-60.  Abstract ( 69 )   PDF (269KB) ( 204 )   Save This paper presents the determination techniques and application cases of optimal perforating level for oil wells in a reservoir with bottom water. References | Related Articles | Metrics

STATISTICS STUDY OF CONGLOMERATE RESERVOIR WATER INJECTION RECOVERY RATIO IN KARAMAY OILFIELD Hu Futang, Wang Jimei 1994, 15 (1):  61-64.  Abstract ( 90 )   PDF (311KB) ( 147 )   Save According to developing data of 33 conglomerate reservoirs of Karamay oilfield, adopting multiple regression sta­tistical method, this paper presents a correlative empirical formula being applicable for forecasting water iniection re­covery radio of conglomerate reservoirs. This formula, compared with some domestic and abroad empirical ones in use now, is much higher in for ecasting accuracy. Related Articles | Metrics

AN ANALYSIS OF PHASE BEHAVIOR OF Kl RESERVOIR FLUIDS FROM WELL SHA 15 IN YAKELA GAS RESERVOIR Tan Chengjun 1994, 15 (1):  65-68.  Abstract ( 90 )   PDF (292KB) ( 250 )   Save The composition and PVT data of the fluids are systematically analyzed from Well Sha 15 in Yakela gas reservoir located on Tabei uplift zone in Tarim Basin and compared with the fluids from typical oil and gas swells. It is con cluded that the phase behavior of Kl reservoir fluids from Well Sha 15 in Yakela gas reservoir is condensate gas with no oil rings. References | Related Articles | Metrics

REASON ANALYSIS OF PRESSURE DECLINE IN DRILLING STEM TEST Wang Xinhai, Xia Weirong 1994, 15 (1):  69-74.  Abstract ( 109 )   PDF (373KB) ( 224 )   Save In this paper, pressure decline reasons were analysed in drilling stem test. Pressure decline resulted from the for mation with non-flow boundaries, or the formation with matter characters changing bad in distant place from well, or dual medium reservoir, or multi-layered reservoirs with large difference in matter characters in DST. So long as shut in time was enough long the pressure decline resulted from the aforementioned reasons would vanish. Nonartesian well test data were interpreted with Horner’ s method and taking real flowing time to be Horner producing time. which might lead to pressure decline. it might v::mish with nonartesian well interpretation methods. Pressure decline was also caused by the two-layered reservoir with different pressure systems in DST. References | Related Articles | Metrics

THE MEASURES OF ENHANCING RECOVERY IN BAMIANHE VISCOUS OIL FAULT BLOCK RESERVOIR Yang Shoushan 1994, 15 (1):  75-80.  Abstract ( 64 )   PDF (768KB) ( 212 )   Save Considering the characteristics of Bamianhe viscous oil fault block reservoir,this paper presents five measures of enhancing water drive recovery efficiency,stimulation and stable production. They are alternating water injection and viscous oil injection, using recycle sea water, changing the completion performation and sand control technique, in­creasing the temperature of oil measures and rational adjusting producing pressure drop etc. There is reference sense for the same type viscous oil fault block reservoir. Related Articles | Metrics

METHOD OF FORECASTING PRODUCTION OF HEAVY OIL BY CYCLIC STEAM INJECTION PROCESS Cheng Zhongping, Qu Aiying, Wang Kuanjing 1994, 15 (1):  81-86.  Abstract ( 71 )   PDF (731KB) ( 219 )   Save Based on the characteristics of cyclic yield changes in production of a heavy oil reservoir by cyclic steam injection process, a self - adapting mixed regression model has been developed. This model is used to estimate the optimum parameters for heavy oil reservoir, fit and forecast yield by the process. Using it to fit and forecast the district D66 etc of Liaohe oil field, the satisfying results were obtained. The method possesses a guiding sinificance in drawing up a long - term plan of the heavy oil thermal recovery, annul plan and development program. References | Related Articles | Metrics