A preliminary study on the geological conditions and indexes for the accumulation of shale gas in the marine-continental transitional facies sediments in the South North China Basin

At present, the Carboniferous-Permian shale gas in South North China Basin is still exploration stage, and understanding of microscopic pore structures, mineral composition hydrocarbon enrichment law marine-continental transitional reservoirs this area extremely limited. In paper, taking reservoir as an example, geological conditions accumulation have been systematically studied using a large amount sedimentary, logging, seismic, core, geochemical, physical property, scanning electron microscope data. The study shows that dark stable widely distributed Basin. Among them, average thickness high-quality Taiyuan Formation 67 m, while Shanxi 56 m. Carboniferous Permian are main strata for distribution resources. developed Formations has largest highest organic matter abundance. addition, types Upper Paleozoic coal-measure source rocks mainly II 2 -III types, small part them belong to 1 types. brittle minerals target quartz, content illite among clay minerals. Porosity negatively correlated with content, positively quartz TOC content. permeability Finally, criteria key indicators were developed.