Hydrocarbon generation and storage mechanisms of deep-water shelf shales of Ordovician Wufeng Formation-Silurian Longmaxi Formation in Sichuan Basin, China

GUO Xusheng,LI Yuping,BORJIGEN Tenger,WANG Qiang,YUAN Tao,SHEN Baojian,MA Zhongliang,WEI Fubin

Table 1 Variation characteristics of porosity and specific surface area of siliceous shale samples.

Sample type Formation Porosity/% Specific surface area/(m2∙g-1) Ro/% Diatomaceous earth Quaternary 80-90 19-65 Siliceous shale Nenjiang Formation of Upper Cretaceous 51.43 92.81 0.40 Siliceous shale Nenjiang Formation of Upper Cretaceous 46.36 74.23 0.40 Siliceous shale Nenjiang Formation of Upper Cretaceous 31.20 68.69 0.40 Siliceous shale Longmaxi Formation of Lower Silurian (Deep-water shelf) 6.34 25.30 2.63 Clay shale Longmaxi Formation of Lower Silurian (Shallow-water shelf) 5.16 17.50 2.63