Accumulation Timing and History of Kuche Petroleum System, Tarim Basin
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摘要: 根据圈闭形成时间法、生烃史法、油藏地球化学方法、包裹体测温法、露点压力法、油气水界面追溯法等多种方法对库车油气系统油气成藏期综合分析认为,该油气系统具有多期成藏、多阶连续的成藏特点。其主要成藏期有3期:即晚第三纪康村早中期(17 #10 Ma)、康村晚期—库车早中期(10 #3 Ma)、库车晚期—第四纪西域期(3 #1 Ma)。前2 期为轮台凸起油气藏形成的主要时期,形成三叠系湖相油藏以及侏罗系中低成熟煤成凝析油气藏。库车晚期—西域期是库车坳陷气藏的主要形成时期,主要形成高—过成熟气藏以及少量次生油藏,最近发现的克拉2 大气田以及克拉3 、大北1 、依南2 、吐孜1 等气藏均属该时期成藏。Abstract: The Kuche petroleum system is a forland type one riched in oil and particularly natural gas generated from the Triassic and Jurassic source rocks including coal source. Many natural gas and condensate fields as well as some oil fields have been discovered, of which the natural gas and condensate are thought to have been generated mainly from coal source of Jurassic and the normal oil from the Triassic mudstone source. Study of these fields' accumulation timing and filling history is significant to exploration in Kuche and therefore the major concern of this paper. Based on synthetic analyses of trap timing, reservoir geochemistry (gas maturity correlation), hydrocarbon fluid inclusions, dew-point pressure and oil/gas-water contact evolution, 3 periods of the formation and filling history of oil and natural gas reservoirs in the Kuche petroleum system are discerned, i.e. early-middle Kangcun period (17~10 Ma), late Kangcun to early-middle Kuche period (10~3 Ma) and late Kuche to Xiyu period (3~1 Ma). The late Kuche to Xiyu period is the major one for formation of natural gas fields of high maturity to over-maturity in Kuche forland thrust belts, in which the discovered gas fields of Kela 2, Kela 3, Dabei 1, Yinan 2 and Tuzi 1 were formed. The late Kangcun to early-middle Kuche period is a critical moment for accumulation of oil and condensate of low to intermediate maturity. And the early-middle Kuche period is a minor one for formation of low-maturity oil and gas reservoirs sourced from coal-type organic matter. Oil and gas fields of early-middle Kangcun and late Kangcun to early-middle Kuche periods were distributed mainly in the Luntai uplift, whereas gas fields of late Kuche to Xiyu period totally in the Kuche forland thrust belts. The early formed oil and condensate accumulations in the forland thrust belts, if there is, have possibly been adjusted and even destroyed by the later strong orogeny and/or the intrusion of natural gas of high maturity and over maturity. The remanined oil accumulations in the thrust belts were mostly secondary reformed during the late Kuche to Xiyu period.
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[1] 1. 李先奇。塔里木盆地天然气聚集及地球化学特征[J].勘探家,1997,2(2):31~36[Li Xianqi.Natural gas accumulation and geochemical characteristics of the Tarin basin[J].Explorationists,1997,2(2):31~36]
2. 戴金星,戚厚发,宋岩。鉴别煤成气和油型气若干指标的初步探讨[J].石油学报,1985,6(2):31~38[Dai Jinxing,Qi Houfa,Song Yan.Discussion on the identification indicators for coal-formed and oil-associated gases[J].Acta Petrolei Sinica,1985,6(2):31~38
3. 戴金星,宋岩,关德师,甘立灯。鉴别煤成气的指标[A].见:煤成气地质研究[C].北京:石油工业出版社,1987.156~170[Dai Jinxing,Song Yan,Guan Deshi,Gan Lideng.The indicators for coal-formed gas identification[A].In:Symposium on geological research of coal-formed gas [C].Beijing:The Petroleum Industry Publishing House,1987.156~170]
4. Haszeldine R S,Samson I M.Cornfort C.Dating diagenesis in a petroleum basin:a new fluid inclusion method[J].Nature,1984,307: 354~357
5. Burrus R,Cercone K R ,Harris P M.Timing of hydrocarbon migration: evidenced from fluid inclusions incalcite cerments,tectonics and burial history[A].Schneidermann N,Harris P M,eds.In: Carbonate cements[C].Soc Econ Paleontol Mineral,Tula,1985.277~289
6. McLimans R K.The application of fluid inclusions to migration of oil and diagenesis in petroleum reservoirs[J].App.Geochem.,1987,(2):585~603
7. Karlsen D A,Nedkvitne T,Larter S R,et al.Hydrocarbon composition of authigenic inclusions: application to elucidation of petroleum reservoir filling history[J].Geochimica et Comochimca Acta,1993,57: 3 641~3 659
8. Pagel M,Walgenwitz F,Dubessy J.Fluid inclusions in oil and gas-bearing sedimentary formations[A].In:Burrus J,ed.Thermal modeling in sedimentary basins[C].Houston,Texas:Gulf Publishing Comp.,1985.565~583
9. 周兴熙等。塔里木盆地天然气形成条件及分布规律[M].北京:石油工业出版社,1998.1~188[Zhou Xingxi,et al.Generation and occurrence of natural gas in Tarim basin.[M].Beijing:The Petroleum Industry Publishing House,1998.1~118]
10. 赵靖舟。油气水界面追溯法与塔里木盆地海相油气成藏期分析[J].石油勘探与开发,2001,28(4): 55~58[Zhao Jingzhou.Timing marine petroleum accumulation in the Tarim basin by oil/gas-water contact retrospecting[J].Petroleum Exploration and Development,2001,28(4):55~58]
11. 赵靖舟。油气水界面追溯法-研究烃类流体运聚成藏史的一种重要方法[J].地学前缘,2001,8(4):373~378[Zhao Jingzhou.Hydrocarbon-water contact retrospection:an effective method in timing hydrocarbon fluid accumulation[J].Earth Science Frontiers,2001,8(4):373~378]
12. 徐永昌等。天然气成因理论及应用[M].北京:科学出版社,1994.1~414[Xu Yongchang,et al.Origin of natural gas:theory and application[M].Beijing:Science Press,1994.1~414]
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