川西南井研地区灯影组断溶体形成机制与识别

Forming mechanism and identification of fault-karst carbonate reservoirs of Dengying Formation in Jingyan area, southwestern Sichuan Basin

李一超 杨飞 徐天鑫 夏文豪 王晴 3

长江大学油气资源与勘探技术教育部重点实验室，湖北 武汉 430100 长江大学地球物理与石油资源学院，湖北 武汉 430100 长江大学地球科学学院，湖北 武汉 430100

MOE Key Laboratory of Exploration Technologies for Oil and Gas Resources, Yangtze University, Wuhan 430100, China College of Geophysics and Petroleum Resources, Yangtze University, Wuhan 430100, China College of Geosciences, Yangtze University, Wuhan 430100, China

川西南井研地区震旦系灯影组地层经桐湾多幕升降运动，发生多期构造变形和岩溶作用，岩溶储层发育。经早寒武世兴凯地裂运动，灯影组内形成一系列层间断层，该系列断层沟通灯影组顶面不整合面，并以断层面发生溶蚀扩大。依据高精度三维地震资料解释，通过构造演化分析，明确了区内灯影组层间断层形成机制；经JS1井钻遇，结合正演模拟分析，借鉴塔河地区断溶体圈闭理论，提出了井研地区灯影组碳酸盐岩断溶体发育模式，明确了断溶体地震响应特征；利用地震多属性分析，结合剖面上的追踪与刻画，明确了断溶体展布特征，为有利区优选提供有力依据。

The Sinian Dengying Formation strata in the Jingyan area of southwestern Sichuan Basin has undergone multi-stage up-and-down tectonic movement of Tongwan, resulting in multi-period tectonic deformation, karstification and karst reservoir development. A series of inter-layer faults formed in Dengying Formation through the Xingkai taphrogenesis in Early Cambrian. This series of faults communicated with the unconformity surface on the top of Dengying Formation, and the carbonate karst was enlarged by fault plane. Based on the interpretation of high-precision 3D seismic data, the formation mechanism of inter-layer faults in Dengying Formation is clarified by structural evolution analysis; by using Well JS1 drilling data, forward modeling analysis and the theory of fault-karst reservoir in Tahe area, the development model of fault-karst carbonate rocks in Dengying Formation of Jingyan is proposed, and the seismic response characteristic of fault-karst carbonate rocks is clarified; based on seismic multi-attribute analysis and tracking and characterization of seismic section, the distribution characteristics of the fault-karst carbonate rocks is obtained, which provides a strong basis for selecting favorable reservoir.

10.6056/dkyqt202002011