上扬子地台北缘古生代广泛沉积了一套海相碳酸盐岩和泥质岩。通过对16条沉积剖面系统采样，结合样品有机地球化学分析结果，认为该区有效烃源岩主要发育在下二叠统、下志留统下部、上奥陶统和下寒武统地层中；烃源岩以I型、Ⅱ 型为主，生烃能力较强，未丧失生气能力。综合评价认为下寒武统及下二叠统是区内的主力烃源岩；下志留统下部及上奥陶统在局部地区可能存在有利的烃源岩发育层段。

In Paleozoic, it widely deposited a set ofmarine carbonatite and pelite rocks in the northern margin of Upper Yangtze Platform. By means of systematic sampling among 16 sedimentary sections in this area, combined with organic geochemical analysis, it confirms that the effective source rocks mainly developed in Lower Permian, Lower Silurian, Upper Ordovician and Lower Cambrian. The types of the source rocks are Ⅰ and Ⅱ1, which have good capability of hydrocarbon generation, and still have the capacity of gas production. It is concluded that the main source rocks are from Lower Cambrian and Lower Permian，and maybe there are some good source enrichment layers in parts of Lower Silurian and Upper Ordovician.