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01 December 1995, Volume 16 Issue 4 Previous Issue    Next Issue

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PETROLEUM GEOLOGY OF KASHI DEPR ESSION Li Xibing 1995, 16 (4):  285-289.  Abstract ( 135 )   PDF (461KB) ( 229 )   Save This paper briefly described the basement feature, caprock characteristics, structure and sedimentology of Kashi depression, and suggested that there are well-deve-loped local structure, rich seepage and active oil (gas) show in the exploratory well.and better source-reservoir-caprock association,in which Jurassic is main source bed，followed: by Upper Cretaceous-Paleogene; Kuzigongsu formation (Upper Jurassic), Kezilesu group sand conglomerate (Lower Cretaceous) and carbonate rock (Paleogene) as main reser-voirs; mudstone and gypsiferous mudstone (Upper Cretaceous-Paleocene and Miocene) as main caprocks.Jurassic authigenic reservoir,“down-sourced”reservoir (Yangye formation of Middle Jurassic is source rock, and Cretaceous reservoir).as well as primary and secondary oil/gas reservoirs (Teriary is source rock) can be found in Kashi depression. Related Articles | Metrics

CHARACTERISTICS OF TRAP IN TARIM BASIN Yao Jianjun 1995, 16 (4):  290-295.  Abstract ( 196 )   PDF (573KB) ( 175 )   Save This paper statistically analyzed the discovered and drilling traps by applying the concepts of "bed trap"and aroided into three major tyes (structu Tarim basin.The discovered traps).six subtypes traps were and egheen minor types.The formation structural al and combination analyzed.The traps condition, distributed along the main fault zone,developed in Neogene.in Tabei uplit were mainly.dominated by anti-The Cretaceous, Triassic, Catonieroues and Ordovrin.and, nd lithologic trap.Paleogene, faulted-anticline type, as well as buried hill type an lithologic type and distributes in central horst anicine 2oe and its NS sos taps in Tazhong area mainly (dominated by buried hll type trap faulted anicline trpe taps and distributed ted in south slope) ocurring in Ordovician and Carboniferous (dominated by anticline type and rface structure in row and large which oil and gas flow scale com-, in nbut n a are.The Msoic Cenoisu depressiojn.Of traps 22%，and plex subsurface structure mprise Kuqa were discovered, anticline traps fkes4 faut block and faul nose traps lithologic traps 15%. Related Articles | Metrics

TRANSVERSAL PREDICTION OF POROSITY IN MABEI OILFIELD Lei Dewen 1995, 16 (4):  296-300.  Abstract ( 86 )   PDF (478KB) ( 148 )   Save Mabei oilfield in Junggar basin is characterized by favourable geological conditions such as thicker oil sand members, great wave impedance difference between reservoir and caprock, simple structure, higher quality of logging and 3-D seismic data, providing with the base for transverse prediction of reservoir.This paper predicted the porosity of major oil layer formation in Mabei oilfield by using few key well data, strati-graphic correlation, picking up of amplitude, matching step by step，restriction of She-crikin and reflection coefficient, conversion of porosity in different intervals, and better result is obtained. References | Related Articles | Metrics

SUBERINITE IN JURASSIC SOURCE ROCKS OF XINJIANG He Ping, Wang Feiyu, Zhao Changyi 1995, 16 (4):  301-306.  Abstract ( 112 )   PDF (553KB) ( 110 )   Save Suberinite occurs commonly in Jurassic coals and terrestrial organic source rocks of Xinjiang, which is formed from suberized cell walls, particularly in plant perid-erm.The proportion of suberinite in organic macerals is generallyless than 2% if only suberized cell walls are counted, and reached up to about 20% if both suberized cell walls and corpocollinite which are contained within the cork cells are counted.At R.=0.35%~0.70%，significant optical change of suberinite is demonstrated,but its changes in mor-phology and content are insignificant.Those phenomena reflected that the suberin and wax fractions in suberized cell walls were obviously lost in low mature stage, and lignified cellulose and cellulose fractions as skeleton of cell walls show indistinct changes.Suberi-nite is progressively evolved to telinite or telocollinite in optical properties during ther mal maturation.At Rup to 0.90%，suberinite is impossibly to be identified.suberinite ex-hibits early thermal degradation to generate hydrocarbon, but suberinite is insubstantial Oil-generated macerals because the content of suberinite in organic matters is relatively low in Jurassic source rocks of Xinjiang. References | Related Articles | Metrics

ORIGIN OF MESOZOIC-CENOZOIC CONTINENTAL FACIES OIL AND HYDROCARBON-GENERATED POTENCIAL EVALUATION OF SOURCE ROCK, LUN-TAI FAULTED UPLIFT ZONE IN TARIM BASIN Zhang Shuichang, Deng Pan, Peng Yan, Xu Zhiming, Li Mei, Xiao Zhongyuan, Yan Gang 1995, 16 (4):  307-311.  Abstract ( 117 )   PDF (424KB) ( 140 )   Save On the basis of correlation of geochemical characteristics of oil-oil and oil-source rock, it is considered that oil in the middle and western parts of Luntai faulted up-lift zone was generated from lacustrine mudstone of Huangshanjie formation (Triassic) in Kuqa depression, and oil in the eastern part was from limnetic coal measure of Jurassic in Kuqa depression, which have extremely high hydrocarbon-generated potencial. Related Articles | Metrics

FRESH WATER APUS FOSSIL GROUP IN JURASSIC AND TRIASSIC IN XINJIANG Yong Tianshou 1995, 16 (4):  312-318.  Abstract ( 159 )   PDF (454KB) ( 148 )   Save The discovered Apus fossils in Jurassic and Triassic have been analyzed and compared in three large basins in Xinjiang.It is considered that the fossils discovered in Kuqa Depression of Tarim basin, MidUpper Triassic of Turpan-Hami basin, Tuosi-tai area in southern Junggar basin, Sangtanghu basin， Yanqi basin, and Mid-Lower Jurassic in Tabei uplift of 1arim basin, all belong to Karamay Apus fossil group, which occurred in late period of Middle Triassic to early and middle periods of Middie Jurassic. Related Articles | Metrics

DISCUSSION ON GENETIC MECHA-NISM AND MODEL FOR DOLOMITIZATION, LOWER PALEOZOIC,TARIM BASIN Shen Zhaoguo, Chen Yongwu, Guo Jianhua 1995, 16 (4):  319-323.  Abstract ( 151 )   PDF (524KB) ( 156 )   Save Dolomite is an important reservoir rock in the carbonate of the Lower Paleozoic,Tarim basin，in which dolomitization took place in (1)capillary concentration and seawater-seepage/reflux, (2)mixed-water, and (3)deeper burial compaction flow at late diagenetic stage.To develop related dolomitization genetic models contributes to understanding and predicting the distribution of dolomite in time and space, guiding the petroleum exploration.Dolomites occurred in different areas and different geologic time in Tarim basin showed different diagenetic mechanism, in which dolomitization of deeper burial compaction flow and mixed water at late diagenetic stage contributes more to the reservoir rock.Deeper burial dolomite with good pore space can form prolific reservoir. References | Related Articles | Metrics

A STUDY ON MESOZOIC-CENOZOIC CONTINENTAL SE-QUENCE STRATIGRAPHY AND ITS APPLICATION IN JUNGGAR BASIN Wang Longzhang 1995, 16 (4):  324-330.  Abstract ( 129 )   PDF (528KB) ( 195 )   Save Five sequences were classfied in Mesozoic-Cenozoic in Junggar basin based on first-order lake level fluctuation.The favourable reservoirs include lowstand system tract, transgression system tract and slope break margin system tract, highstand system tract is both possible source bed and regional caprock.Lithological trap may be developed during second-order lake level fluctuation.This paper primarily discussed favourable reservoir facies beltvS in northwest margin in Junggar basin based on study of the lake level fluctuation and sequence stratigraphy. References | Related Articles | Metrics

A STUDY ON PERMIAN IN SHUANGJINGZI SECTION, KELAMEILI AREA OF JUNGGAR BASIN Ji Liming, Deng Yunshan, Wu Zhiyong 1995, 16 (4):  331-334.  Abstract ( 124 )   PDF (355KB) ( 162 )   Save By means of analysis and comparison of distribution and assemblage characteristics of Permian sporopollen fossils in Shuangjingzi section in Kelameili area of Junggar basin, it is considered that the geologic time of Pingdiquan formation is Middle Kazanian-Middle Tatarian period in middle period of late Permian, combining with the study results of magnetic bed and isotopic age. References | Related Articles | Metrics

LITHOFA-CIES AND PALEOGEOGRAPHY (UPPER PALEOZOIC) IN FUHA1 AREA OF NORTH XINJIANG Wu Xiaozhi, Xiang Shuzheng, Zhao Yongde, Wang Xu, Wu Shaozhu 1995, 16 (4):  335-342.  Abstract ( 155 )   PDF (732KB) ( 163 )   Save Fuhai area of Xinjiang is located in north margin of Kazakhstan，adjacent to Siberian ancient plate, and belongs to island arc and back arc basin structural environ-ment with strong tectonic activity.The types of sedimentary basin constantly change in Upper Paleozoic, including oceanic basin, residual sea basin, island arc basin, periconti-nental arc basin and landlocked rift basin, etc., and there is a complete set of lithofacies types，including deep sea facies，neritic facies，littoral facies，delta facies，fluvial fades， lake facies and marsh facies.Sedimentary facies zones are complicated in distribution, and alternatively developed multiple subfacies formed mixed subfacies zones in the same area.In Late Carboniferous.following the thorough marine regression, continental deposits occourred entirely and enormous changes in paleoclimate had taken place correspondingly.At the end of Early Permian, history of Paleozoic deposition is generally finished, which is resulted in widespread absence of deposits of Late Permian in Fuhai area. References | Related Articles | Metrics

ESTABLISHMENT OF A PORE STRUCTURE CHART AND ITS PRACTICAL SIGNIFICANCE IN TERTIARY RECOVERY PILOT AREA IN KARAMAY OILFIELD Yue Xinjian 1995, 16 (4):  343-346.  Abstract ( 115 )   PDF (405KB) ( 184 )   Save On the basis of 41 measured capillary pressure curves and analysis data of permeability and porosity in Lower Karamay formation reservoir (T2k) in tertiary recovery pilot area in middle District No.2 in Karamay oilfield, this paper established the plot of permeability and porosity, mercury saturation under different pressures by adopting data-matching method.Results show better agreement between predicted and measured capillary pressure curves. References | Related Articles | Metrics

APPLICATION OF RESERVOIR DESCRIPTION TECHNIQUE IN KARAMAY OILFIELD Du Shekuan, Liu Jishan, Lei Dewen, Jia Mingchen, Niu Zhijie 1995, 16 (4):  347-351.  Abstract ( 97 )   PDF (499KB) ( 147 )   Save With respect to Wuerhe formation reservoir (Upper Permian), south District No.5 in northwest margin of Junggar basin, the reservoir description has been made with 2~D seismic data.Based on the reservoir framework description, 26 high-quality 2-D seismic profiles which travel through more holes have been selected in work area, the fine interpretation has been made on CHARISMA (Schlumberger Co.) and INTEGRAL (CGG Co.) exploration workstations.The data of seismic, logging, drill stem testing, and lab analysis were wholly used to undergo the structure and sedimentology description, lateral tracing of oil and gas bed, backward modelling of absolute wave impedance and porosity profiles, and studies in change of porosity in plane.Gas/oil contact and oil/water contact were determined by using varied information of seismic event and absolute wave impedance profile.The agreement between the above results and drilling results suggest that the fine reservoir description with 2 D seismic data in northwest margin of Junggar basin is feasible. References | Related Articles | Metrics

DETERMINATION OF AGE OF JURASSIC RESERVOIR IN JUNGGAR BASIN BY D1AGENETIC METHOD Liu Shuhui, Haliya 1995, 16 (4):  352-356.  Abstract ( 67 )   PDF (516KB) ( 139 )   Save There are different periods of reservoirs in Jurassic in Junggar basin, which can be divided into two types by diagenetic method, one formed during Yanshan orogeny (Permian source rock), the other formed during Himalayan orogeny (Jurassic source rock).Larger scale reservoirs formed during Yanshan orogeny may exist in Jurassic in hinterland of Junggar basin. References | Related Articles | Metrics

AN INJECTION-PRODUCTION-CURVE METHOD FOR PRE-DICTING THERMAL HEAVY OIL PERFORMANCE Liu Xinfu, Wu Xia 1995, 16 (4):  357-361.  Abstract ( 73 )   PDF (389KB) ( 124 )   Save Thermal heavy oil recovery case study showed that there is better linear relation between lg2Np and lglgQS,lgLPNp and lg2QS during the certain stage of thermal heavy oil recovery, where Np is cumulative oil production, Lp is cumulative liquid production, and QS is cumulative steam injection.On the basis of these linear relations, the formula can be derived to calculate each development index and to predict thermal heavy oil performance. References | Related Articles | Metrics

DEVELOPMENT AND APPLICATION PROSPECT OF IN SITU COMBUSTION TECHNIQUE IN KARAMAY OILFIELD Chen Gan, Yue Xinjian 1995, 16 (4):  362-367.  Abstract ( 83 )   PDF (641KB) ( 188 )   Save Based on the in situ combustion technique and its application condition from abroad，this paper summerizes the experiences of field test of in situ combustion in northwest margin of Junggar basin.It is considered that sufficient conditions have provided here to develop this technique.Having analyzed the development situation and research condition of enhanced oil recovery tests of each oilfield in northwest margin of Junggar basin, this paper points out that it is necessary to develop this technique.It not only has extensively application prospect，but also has important significance in maintaining production to increase continously and obtaining huge economic benefit. References | Related Articles | Metrics

DISCUSSION ON GENETIC MECHANISM AND MODEL FOR DOLOMITIZATION, LOWER PALEOZOIC, TARIM BASIN Shen Zhaoguo, Chen Yongwu, Guo Jianhua 1995, 16 (4):  368-374.  Abstract ( 66 )   PDF (375KB) ( 124 )   Save Dolomite is an important reservoir rock in the carbonate of the Lower Paleozoic, Tarim basin, in which dolomitization took place in (l) capillary concentration and seawater-seep-age/reflux, (2) mixed-water, and (3) deeper burial compaction flow at late diagenetic stage.To develop related dolomitization genetic models contributes to understanding and predicting the distribution of dolomite in time and space, guiding the petroleum exploration.Dolomites oc-curred in different areas and different geologic time in Tarim basin showed different diagenetic mechanism, in which dolomitization of deeper burial compaction flow and mixed water at late dia-genetic stage contributes more to the reservoir rock.Deeper burial dolomite with good pore space can form prolific reservoir. References | Related Articles | Metrics