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Formation and enrichment mode of Jiaoshiba shale gas field,Sichuan Basin

Guo Tonglou;Zhang Hanrong;Exploration Southern Company,Sinopec;  
The Silurian Longmaxi shale gas play in the Jiaoshiba structure in the southeast margin of the Sichuan Basin is studied to discuss the key control factors of shale gas enrichment in complex tectonic and high evolution zone.The Jiaoshiba structure is a faulted anticline which experienced multiphase tectonic movement.The Longmaxi Formation has high thermal evolution degree with Ro more than 2.2%,and has a 35-45 meters thick high-quality shale(TOC 2%) in its lower part.The reservoir is overpressure with a pressure coefficient of 1.55,and the shale gas production and pressure are stable.Structure type,evolution and geochemical analysis show that there are several stages of hydrocarbon generation,migration and accumulation in the Longmaxi Formation.The joint action of two groups(two stages) of fault systems and the detachment surface at the bottom of the Longmaxi Formation controls the development of reticular cracks and overpressure preservation,and it is the key to the shale gas accumulation and high yield.The closed box system in the Longmaxi Formation ensures the gas reservoir dynamic balance.The model of high yield and enrichment of the Jiaoshiba shale gas play is "ladder migration,anticline accumulation,fault–slip plane controlling fractures,and box shape reservoir".Like in conventional gas plays,good preservation and tectonic conditions are also required to form high yield shale plays in areas which have complex structures,experienced multi-stage tectonic movement,and have high evolution shale.
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