东濮凹陷长垣断层系中转换斜坡的特征与油气勘探

The characteristic of relay ramps in fault system of the placanticline in Dongpu sag and their relevance to hydrocarbon exploration

东濮凹陷西部长垣断层系为由 5条断层首尾相互叠覆组成的雁列状断层系 ,断层叠覆段发育转换斜坡。转换斜坡连接一条断层的上盘和另一断层的下盘 ,具有特殊的变形特征 ,在转换斜坡近旁的断层系上盘伴生横向背斜。叠覆断层间通过转换斜坡的变形和断层两盘位移进行位移传递。转换斜坡的成因与叠覆断层系的分段演化有关。转换斜坡及横向背斜对烃源岩和储集层的发育及分布有重要影响 ,是有利的油气勘探目标。图 5参

The fault system of the placanticline in western Dongpu sag is an en echelon fault system consisting of five overlapping faults, relay ramps lie in the overlapping segments. They connect the hanging wall of one fault to the footwall of another fault, and have special deforming feature, beside them on the hanging wall there are transverse anticlines. Displacement transfer between overlapping faults by deforming and faulting on them, their origin is related to segmentation of fault system. Relay ramps and transverse anticlines have great influence on the distribution of source and reservoir rock, they are potential targets.