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《Oil & Gas Geology》 2005-06
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Analysis of highly efficient gas reservoiring process in Kuqa depression

Zhao Wenzhi~1,Wang Hongjun~1,Shan Jiazeng~2,Wang Zhaoyun~1,Zhao Changyi~1,Wang Zecheng~1(1.Research Institute of Petroleum Exploration & Development,PetroChina,Beijing; 2.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing)  
Kuqa depression in Tarim basin has the basic geologic conditions to form medium and large gas pools.The Triassic-Jurassic source rocks not only have very large cumulative gas generating intensity,but also have experienced a very rapid gas generating and discharging process since Neogene;thus they have become highly efficient gas kitchens and played a key role in the formation of Kela 2 type high efficient gas pools.The piedmont thrust zone in Kuqa depression has been strongly deformed due to the compression since Neogene.Vertical superimposition of Cretaceous-Jurassic strata below the halite resulted in increment of rock volume.Being sealed by good caprock,the rock volume enlargement would lead to structural swabbing,an important process for the formation of Kela 2 type high efficient gas pools.Simulation experiments of hydrocarbon-generating kinetics and tectophysics have proved these new understandings and further revealed the effective gas generation of Jurassic source rocks and effective gas migration and accumulation process in Kuqa depression.
【Fund】: 国家重点基础研究发展规划(973)项目(2001CB209100)
【CateGory Index】: P618.130.2
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