黄骅坳陷孔南地区孔东断层演化特征研究

Evolution Characteristics of Kongdong Fault and its Relation with Oil and Gas in the South of Huanghua Depression

从孔南地区新生代成盆演化特征入手,通过对孔东断层及派生次级断裂古落差的计算分析,对孔东断层形成机理及演化特征进行研究。其形成于孔一上段,可细分为孔一上段初始弱活动期、沙三段—沙一段强烈活动期,沙一段后平静期三个阶段。孔东断层活动期正是孔二段烃源岩的生排烃期,为油气运移聚集的有利输导体系,而沿断裂形成一系列的圈闭为油气的有利聚集带,成为油气评价开发的有利场所。

This paper,based on the characteristics of Cenozoic basin evolution in the southern area of the Huanghua depression, studies the formation mechanism and evolution characteristics of the fault through the calculation and analysis of ancient drop of the secondary fault. The fault comes into being in upper First Member of the Kongdian Formation, and it can be subdivided into three stages ： Initial weak active pe-riod in upper First Member of the Kongdian Formation, intense activity period in Third - First Member of Shahejie Formation, and the quiet period after First Member of the Shahejie Formation. Kongdong fault activity period is exactly the time for hydrocarbon generation and expul-sion of the Second Member of Kongdian Formation, and it is favorable for oil and gas transportation system. A series of traps formed along the fault are favorable for oil and gas accumulation, becoming a favorable place for the oil and gas accumulation.