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《Petroleum Exploration and Development》 2010-06
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Geological characteristics,formation mechanism and resource potential of shale gas in China

Zou Caineng1,2,Dong Dazhong1,2,Wang Shejiao1,2,Li Jianzhong1,2,Li Xinjing1,2,Wang Yuman1,2,Li Denghua1,2,Cheng Keming1,2(1.PetroChina Research Institute of Petroleum Exploration & Development,Beijing 100083,China;2.State Key Laboratory of EOR,Beijing 100083,China)  
With Sichuan Basin as focus,this paper introduces the depositional environment,geochemical and reservoir characteristics,gas concentration and prospective resource potential of three different types of shale in China: marine shale,marine-terrigenous shale and terrigenous shale.Marine shale features high organic abundance(TOC: 1.0%-5.5%),high-over maturity(Ro: 2.0%-5.0%),rich accumulation of shale gas(gas concentration: 1.17-6.02 m3/t) and continental shelf deposition,mainly distributed in the Paleozoic in the Yangtze area,Southern China,the Paleozoic in Northern China Platform and the Cambrian-Ordovician in Tarim Basin;Marine-terrigenous coalbed carbonaceous shale has high organic abundance(TOC: 2.6%-5.4%) and medium maturity(Ro: 1.1%-2.5%);Terrigenous shale in the Mesozoic and Cenozoic has high organic abundance(TOC: 0.5%-22.0%) and low to middle maturity(Ro: 0.6%-1.5%).The study on shale reservoirs in the Lower Paleozoic in Sichuan Basin firstly indicated that Cambrian and Silurian marine shale developed lots of micro-and nanometer-sized pores,which is quite similar to the conditions in North America.Through comprehensive evaluation,it is thought that several shale gas intervals in Sichuan Basin are the practical targets for shale gas exploration and development,and that the Weiyuan-Changning area in the Mid-South of Sichuan Basin is the core area for shale gas exploration and development,which is characterized by high thermal evolution degree(Ro: 2.0%-4.0%),high porosity(3.0%-4.8%),high gas concentration(2.82-3.28 m3/t),high brittle mineral content(40%-80%) and proper burial depth(1 500-4 500 m).
【Fund】: 国家大型气田与煤层气开发项目(2008ZX05001)
【CateGory Index】: P618.13
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