Abstract
Continental shale, especially lacustrine shale, has great hydrocarbon generation potential and abundant oil and gas resource in China. Due to the limitation of thermal evolution, the lacustrine shales in Sichuan Basin are mainly oil reservoirs. Thus, there are few studies on the gas-bearing characteristics of lacustrine shale gas reservoirs. For the highly evolved lacustrine shale in the first member of Qianfoya Formation in Puguang area, the gas bearing characteristics and main controlling factors in the study area are analyzed from the micro and macro perspectives by means of on-site analytical gas content test, total organic carbon content test, whole rock X-ray diffraction and pore structure test, combined with the gas-bearing properties and preservation condition parameters of typical wells in the study area. The research shows that： microscopically, the more developed the laminae, the better the enrichment and retention capacity of shale gas; macroscopically, there is a large-scale accumulation and enrichment area within the stable syncline, and the local micro fault development area in the syncline area is a dominant enrichment area. Like the marine enrichment theory, the sedimentary environment and preservation conditions are still the preconditions for the enrichment of lacustrine shale gas reservoirs.
论文详情