Sedimentology and Geochemistry of the Upper Permian Linghao Formation Marine Shale, Central Nanpanjiang Basin, SW China

The Upper Permian Linghao Formation marine shale and contemporaneous transitional are the most potential gas targets in Nanpanjiang basin, which is characterized by considerable TOC content, wide distribution, thickness. On basis of division Formation, petrographic, mineralogical, high-resolution geochemical analyses were integrated to reveal sedimentary environment including paleoproductivity, paleoredox conditions, detrital influx, paleoclimate, paleosalinity. There two organic-rich intervals Ling 1 member lower 3 member. dominated deep-water shelf facies, high value (0.93%–6.36%, avg. 2.43%), influx proxies (Zr, 746–1508 ppm, 1093 ppm; Ti, 19278–128730 16091 ppm), relatively warm–humid paleoclimate condition (CIA*, 75.94-91.90, 82.26), low paleosalinity (Sr/Ba, 0.13-0.34, 0.22), paleoproductivity (P/Al (10 ?2 ), 1.06-2.06, 1.63; Mn/Ca ?3 27.37-291.69, 128.07). Detrital gravity flow plays a critical role enrichment organic matter. upper same as that 1. Unlike 1, these proxies, moderate weathering, proxies. volcanic ash Emei volcanism felsic South China matter 3, respectively. models for can factors controlling