涟源坳陷中部构造带勘探潜力分析

裸露海相地层的勘探潜力一直是石油地质工作者所关心的问题。从涟源坳陷中部构造带基底性质、沉积盖层演化等方面入手,分析了各构造运动时期的应力性质,重点分析了中部构造带的构造样式及其形成机理,指出中部构造带的构造样式是盖层滑脱型,其关键构造要素是犁式叠瓦状逆冲断层和倾向腹地式的双冲断层系,构造变形主要发育于印支期,定型于燕山早-中期。结合烃源岩特征、资源潜力、储层盖层条件、埋藏情况等,查明了主要的生烃时期。通过分析油气运移与构造圈闭形成之间的配套关系,指出了勘探方向。

THE TECTONIC CHARACTERISTICS OF THE MIDDLE STRUCTURAL BELT IN LIANYUAN DEPRESSION AND ITS PROSPECT ON GAS POOL FORMATION

It is always a big problem in hydrocarbon resource exploration in exposed marine strata. Based on the analysis of basement, the evolution of the cap rocks, and the stress property of each structure stages, the structure style has been studied in detail. The tectonic pattern is of cap rock detachment style, and the key tectonic elements are duplex and listric nappe thrust. It is concluded that the main tectonic pattern was developed in the Indo-Chinese Stage, and settled in the middle to late of Yanshan Stage. With the analysis of source rocks, pootential of hydrocarbon and trap condition, the main trap types have been classified. By the consistency analysis of hydrocarbon movement and structural traps formation, the next steps in exploration have been brought forward.