General comment Eight outcrop sections are selected to systematically analyze the organic geochemistry of 8 sets of marine source rocks in northwestern Sichuan, including Doushantuo Formation of Lower Sinian, Dengsan Formation of Upper Sinian, Qiongzhusi Formation of Lower Cambrian, Longmaxi Formation of Lower Silurian, Middle Devonian, Maokou Formation of Middle Permian, Longtan Formation/Wujiaping Formation of Upper Permian and Dalong Formation, and discuss the natural gas exploration potential in this area. |