焦石坝地区五峰组-龙马溪组页岩气成藏地质特征

Geological Feature of Shale Gas Reservoir in Jiaoshiba Area

基于焦石坝地区页岩气勘探、研究与实践,从页岩层厚度、地化、储集、岩矿等多个方面剖析了焦石坝地区五峰组-龙马溪组页岩气成藏地质特征。结果表明：焦石坝地区优质页岩储层厚度均大于30m,一般在35~45m;储层页岩有机质含量高、热演化程度适中,有机质类型以腐泥无定形体＋藻类体为主;储集层矿物成分以石英和黏土矿物为主,微裂缝发育活跃;深水陆棚相沉积中富含大量含硅质及碳酸盐矿物的生物,较其它层位的页岩具有更高的脆性矿物含量。

This paper analyzes the geological feature of shale gas reservoir from Wufeng formation to Longmaxi forma- tion in Jiaoshiba area in light of thickness of shale bed, geochemistry, accumulation as well as rock and minerals, and then argues that the reservoir thickness of high grade shale there is from 35 meters to 45 meters. Its organic matters consist mainly of amorphous--state propel and alginate. Its mineral compositions are largely quartz and clay miner- als and its micro fractures are well--developed. There are abundant creatures with silicon and carbonate minerals in the deposition with deep shelf facies.