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Study advances on organic pores in organic matter-rich mud shale

LUO Xiao-ping;WU Piao;ZHAO Jian-hong;YANG Ning;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology;Research Institute of Exploration and Development,Zhongyuan Oilfield Company, SINOPEC;  
The organic pore is the main kind of pore type in the mud shale reservoir and one of the key factors influencing the enrichment of shale gas.In recent years,the genesis and the influencing factors of the organic pore as well as properties of the reservoir and permeability of the shale gas reservoir have achieved great progress.These researches show that the types of the organic pore include the pores formed by the generation of hydrocarbon in kerogen and that formed by tar cracking.According to the sizes,the organic pores can classified into macropore,mesopore and micropore.The shale gas is restored in mesopores and micropores as an absorbed phase,and in macropores as a free phase.The free gas in the organic macropores flows in non-Darcian way.The organic maturity(Ro)of the organic matter is 0.9%~3.6%,the organic type with sapropelic and vitrinite type,and the high TOC content(2.0%)are the favorable factors for the development of organic pores.The mud shale with high compaction degree,high fluid pressure and high content of brittle minerals are the advantageousconditions for the preservation of the organic pores.
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