惠民凹陷南斜坡构造体系研究

Research on the Mesozoic tectonic system in south slopes of Huimin Sag

惠民凹陷中浅层认识程度较高,油气勘探程度中等;而中深层地质构造复杂,勘探还处于初期阶段。在研究了大量地球物理资料和区域地质资料的基础上,分析了新生代构造特征,重新对惠民凹陷南斜坡进行了立体构造解释,发现了中生代北西西基底剪切带和其伴生构造,认为新生界主要受控于喜马拉雅运动产生的张扭应力,而中生界则受控于燕山运动的压扭应力场,两种构造体系在时间上的叠加和空间上的组合造成惠民凹陷深、浅构造差异明显。

For Huimin Sag,the middle-shallow formations were well recognized,and its hydrocarbon exploration at the middle stage,while the middle-deep formations have complex structures and its hydrocarbon exploration is still at the early stage.After studying abundant geophysical data and local geologic data,the Cenozoic tectonic characteristics were analyzed,and stereo structure interpretation was carried out on the south slope in Huimin Sag.Then,the NWW shear belt of Mesozoic base and its concomitant structures were discovered.It is thought that Cenozoic and Mesozoic were separately controlled by the tense-shear stress generated in the Himalayan movement and the compressive-shear stress field generated in the Yanshanian movement period.Moreover,the two kinds of tectonic systems stack in time and combine in space,which causes the obvious contrast of shallow and deep structures in Huimin Sag.