辽中凹陷南洼A走滑构造特征及成因分析

Strike-slip structure characteristics and genesis analysis of A tectonic,south of Liaozhong sag in the Liaodong bay depression

基于三维地震资料精细解释结果,在辽中凹陷南洼A识别出两条主干走滑断层,受其发育特征差异性的控制,形成了不同的伴生构造类型。结合物理模拟实验对其构造成因进行了分析,结果表明,由于两条主走滑断层两侧在不同位置应力条件和活动性的差异,走滑断层与其伴生断层形成了多级"Y"形、负花状和下铲上花状三种构造样式,并相应形成走滑双控叠覆伸展构造、走滑主控断内伸展构造和走滑主控断内挤压构造三种构造类型,各种构造类型具有不同的圈闭效应和油气运移条件。

Based on 3D seismic data interpretation results,two main strike-slip faults in A tectonic,south of the Liaozhong sag in the Liaodong bay depression were identified.Under the control of the diversity of its developmental characteristics,different kinds of associated tectonic were formed.Combined with the physical simulation experiment,the tectonic causes were analyzed.The results indicated the clear existence of strike-slip faults and its associated tectonic formed by the petroleum geological significance and two major strike-slip faults on both sides because of the difference of stress conditions and activity in different positions,strike-slip faults and their associated fault formed multi-stage‘Y',negative flower structure and shovel type negative flower structure three types of tectonic style,and accordingly formed strike-slip double stretch superposition structure,strike-slip master fault extensional structure and strike-slip fault in extrusion structure control three structure types,with different trap effect and hydrocarbon migration conditions.