走滑构造变形特征及其形成圈闭分布

Deformation Features and Trap Distribution of Strike-slip Structures

为了揭示走滑构造圈闭的分布规律,指导油气勘探,以油区构造解析理论为指导,在走滑构造变形以及演化特征分析的基础上,总结走滑构造圈闭的成因与分布模式。走滑构造圈闭总体沿着走滑断层带水平位移转换为垂直位移的区段带状分布;不同分布位置都存在增压收缩和释压拉张2种应力状态。增压收缩区多发育背斜—断背斜类圈闭,圈闭较为整装单一,面积较大;而释压拉张区一般发育断块—断鼻类圈闭,圈闭较为分散,规模相对较小。勘探实践证实,走滑构造圈闭分布规律认识可以较好地指导走滑变形区圈闭的成因分析和构造落实。

In order to reveal the distribution rules of strike-slip structural traps and instruct oil/gas exploration,the origin and distribution mode of such traps are investigated according to the analytical theory of structures of oil zones and based on the analysis on deformation and evolution features of strike-slip structures. Generally,the strike-slip structural traps distribute in bands along the strike-slip fault,and transform from horizontal displacement to vertical displacement. There are two types of stress state,namely,pressurized contraction and released tension,in different locations. Anticline-faulted anticline traps mainly develop in pressurizedcontraction area,where traps are characterized by uniformity and large area. Faulted blocks – faulted noses mainly develop in released tension area,where traps are characterized by scattered distribution and small scale. The exploration practices have proved that the understanding of the distribution rules of strike-slip structural traps can guide the analysis on the origin of traps in strike-slip deformation area as well as the confirmation of structures.