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五指山构造区位于四川盆地西南边缘,由于构造运动频繁、地质条件复杂,在一定程度上制约了其油气勘探进程。根据区域地质调查结果以及实测的有机地球化学数据,分别从残余有机碳含量、有机质类型、有机质成熟度以及生烃强度等4个方面对其烃源岩进行定量评价。结果表明:该区烃源岩主要发育在下寒武统筇竹寺组、下志留统龙马溪组、下二叠统;烃源岩有机质类型好,主要以腐泥—偏腐泥混合型为主;成熟度较高,现今处于高成熟—过成熟阶段,以产气为主;生烃强度计算结果表明,下寒武统、下志留统烃源岩条件最好,是其主力烃源层系,平均生烃强度分别为:63×108m3/km2、44.5×108m3/km2。从烃源岩条件看,五指山构造具备形成大中型气田的物质基础。
The Wuzhishan structural zone is located on the southwestern margin of the Sichuan Basin. Due to its frequent tectonic movement and complicated geological conditions, the Wuzhishan structural zone has restricted its hydrocarbon exploration process to a certain extent. According to the results of regional geological survey and the measured organic geochemical data, the source rocks of the source rocks are quantitatively evaluated from the aspects of residual organic carbon content, organic matter type, organic matter maturity and hydrocarbon generation intensity. The results show that the source rocks of this area are mainly developed in the Lower Cambrian Qiongzhusi Formation and the Lower Silurian Longmaxi Formation and the Lower Permian. The organic matter types of source rocks are good, The main maturity is high. Nowadays, it is in the stage of high maturity and over maturity, with gas generation as the main source. The calculation of hydrocarbon generation intensity shows that the Lower Cambrian and Lower Silurian source rocks have the best conditions and are the main source of hydrocarbon Layer, the average hydrocarbon generation intensity is: 63 × 108m3 / km2, 44.5 × 108m3 / km2. From the source rock conditions, the Wuzhishan structure has the material basis for forming large and medium-sized gas fields.