At present, the southwestern Shunan region has become a hot spot for exploration and a key area. According to measured and collected data of source rocks, parameters, such as organic carbon content, organic matter type, maturity of organic matter and the intensity to generate hydrocarbon have been evaluated. It shows that source rocks in the area are mainly developed in the Lower Cambrian Qiongzhusi Formation, the Lower Silurian Longmaxi Formation, the Permian Yangxin Series and Lower Triassic Jialingjiang Formation. Among them, clay\|stone is predominant. The organic carbon content is high in the source rock. The organic material type is good. The main kerogen type is Ⅰ—Ⅱ1. Maturity is high. Gas generation is predominant during the high mature and post mature phases. The hydrocarbon generation intensity shows that the condition of Lower Cambrian and Lower Silurian source rock is the best. And they are the main source layer systems in this area. The average hydrocarbon generation intensity is 63×108m 3/km 2 and 44.5×10 8m 3/km 2, respectively.
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