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川西合兴场须家河二段气藏为非常规的裂缝性气藏,对该区的断裂体系进行分析,深入认识该区的断裂分布规律与演化特征对气藏的开发尤为重要。通过对合兴场主要地震剖面进行构造分析和解释,发现研究区内发育有深、浅两套断裂体系,典型构造样式为正花状构造、突发构造、构造三角楔、X共轭逆冲断层。通过对不整合面的分析和生长地层的研究,确定断裂体系的形成期次:深层断裂体系的形成始于T3x3中后期,并在T3x4~T3x5沉积期间持续活动,在J沉积前基本停止;浅层断裂体系形成于燕山期,其构造活动持续并加强。深层断裂体系具逆冲-走滑构造特征,空间上呈X型共轭关系,分别对应南北向与东西向断层。
The gas reservoir in the second part of Xujiahe, Hexingchang, in western Sichuan, is an unconventional fractured gas reservoir. Based on the analysis of the fault system in this area, it is particularly important to understand the fracture distribution and evolution characteristics in this area. Through the structural analysis and interpretation of the main seismic sections of Hexing Field, it is found that there are two sets of deep and shallow fault systems in the study area. The typical tectonic styles are positive flower structure, sudden structure, structural triangular wedge, X conjugate thrust Fault. Through the analysis of unconformity and the study of growth strata, the formation of fault system was confirmed. The formation of deep fault system began in the middle and late stage of T3x3 and continued during the deposition of T3x4 ~ T3x5 and stopped basically before deposition of J; The fault system formed in the Yanshanian period and its tectonic activity continued and strengthened. Deep fault system with thrust-strike-slip tectonic features, the space was X-type conjugate relationship, respectively, corresponding to the north-south and east-west fault.