川西孝泉-丰谷构造带须三段致密油气成藏主控因素分析

川西坳陷须三段烃源岩层属于低孔低渗-特低孔特低渗致密储层，具有源内找气的巨大勘探潜力。基于油气分布规律、目标区域的成藏地质背景，以及对关键井、优质烃源岩的解剖，并结合前人的成果，通过对孝泉-丰谷构造带的烃源岩特征、沉积相分布、油气演化过程和压力系统的研究，明确了该地区为纵向叠置-平面交织-近距离叠覆运聚模式，源内成藏为三角洲前缘亚相的气藏成藏类型。总结出研究区成藏主控因素为优质烃源岩的发育、有利相带的发育、异常压力的形成和保持。

Analysis of Main Controlling Factors of Tight Oil and Gas Accumulation In The Third Member of Xujiahe Formation in Xiaoquan-Fenggu Structural Belt of Western Sichuan

The third member of Xujiahe Formation in the Western Sichuan Depression belongs to low porosity and low permeability-ultra-low porosity and ultra-low permeability tight reservoirs, which have great exploration potential for finding gas within the source. Based on the distribution of oil and gas, the geological background of accumulation in the target area, and the dissection of key wells and high-quality source rocks, combined with previous achievements, the characteristics of source rocks and sedimentary facies in the Xiaoquan-Fenggu structural belt, spatial distribution, oil and gas evolution process, and pressure system research, the main controlling factors of accumulation in the Xiaoquan-Fenggu structural belt were analyzed, and it is clarified that this area is a vertical superposition-plane interweaving-close superposition migration and accumulation mode, In-source accumulation is the gas accumulation type of delta front subfacies. It is concluded that the main controlling factors for accumulation in the study area are the development of high-quality source rocks, the development of favorable facies belts, the formation and maintenance of abnormal pressure.