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Geological conditions and exploration potential of Permian marineecontinent transitional facies shale gas in the Sichuan Basin 被引量：2
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作者 Guo Xusheng Hu Dongfeng +2 位作者 Liu Ruobing Wei Xiangfeng Wei Fubin 《Natural Gas Industry B》 2019年第3期198-204,共7页
Marineecontinent transitional facies shale of the Longtan Fm,Upper Permian is an important source rock stratum in the Sichuan Basin.The previous researches on it mainly focus more on source rock evaluation,but less on... Marineecontinent transitional facies shale of the Longtan Fm,Upper Permian is an important source rock stratum in the Sichuan Basin.The previous researches on it mainly focus more on source rock evaluation,but less on shale gas accumulation.In this paper,the test and analysis results of Well DYS1,the coring well of Longtan Fm were dissected.Combined with the drilling results of its adjacent area,the organic rich shale in the Longtan Fm were studied from the aspects of distribution,geochemical,reservoir,gas-bearing characteristics and roof and floor conditions,and then compared with the shale strata with similar sedimentary background and good shale gas shows.And accordingly,its geological conditions for the formation of Longtan shale gas and its exploration potential were made clear.And the following research results were obtained.First,in the southeastern Sichuan Basin,the organic rich shale of transitional facies of Longtan Fm is developed with a thickness of more than 40 m.It is characterized by high brittle mineral content,high porosity,high total organic carbon(TOC),moderate thermal evolution(R_(o))and good gas-bearing property.Therefore,it is geologically favorable for the formation of shale gas.Second,compared with the existing transitional facies shales at home and abroad,the Longtan shale is better in terms of porosity,TOC,R_(o),gas content and other key parameters.Third,the type of organic matters is the main reason for the low development degree of organic pores in the Longtan shale.And during its shale gas exploration and selection,the coal seam enriched sections shall be avoided.In conclusion,considering the development degree,interlayer thickness,depth and preservation conditions of organic rich shale comprehensively,the QijiangeChishui area is the best exploration area for the transitional facies shale gas of Longtan Fm in the Sichuan Basin.©2019 Sichuan Petroleum Administration. 展开更多
关键词 Sichuan basin Late Permian Longtan Fm Marineecontinental transitional facies SHALE Total organic carbon Thermal evolution maturity Gas content Shale gas exploration potential
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