济阳坳陷印支—燕山期构造运动特征与油气藏的关系

RELATIONSHIP BETWEEN TECTONICS AND HYDROCARBON RESERVOIRS FROM INDO-CHINESE EPOCH TO STAGE OF YANSHAN IN JIYANG DEPRESSION

济阳坳陷位于渤海湾盆地东南部,是我国东部重要的含油气盆地。中生代印支运动和燕山运动是对济阳坳陷有重大改造的2次构造运动,印支期主要发育NW向逆推断层,燕山早期则为逆断层向正断层的过渡阶段,燕山中、晚期NW向断层发生构造反转,由逆断层转换为正断层。认为中生代的这2次构造运动不仅直接对济阳坳陷古生代地层有很大的改造作用,而且也影响了该坳陷中生代地层的发育,对中生代的油气运聚成藏也产生了重要的制约作用。

Jiyang depression is located in the southeast of Bohai Bay basin and is an important oil-gas basin in China. The Indo-Chinese movement and Yanshan movement were two important tectonic movements in the Mesozoic era. NW-trending reversed faults were well-developed in the Indo-Chinese epoch. The early stage of Yanshan is a transitional stage from reversed faults to normal faults. The reversal tectonic activity took place in the medium-late stage of Yanshan among the NW-trending reversed faults, and the reversed faults were translated into normal faults. The stratigraphic sequences of Paleozoic were reformed largely after the Indo-Chinese movement and the stratigraphic feature of Mesozoic was affected after the Yanshan movement. The hydrocarbon resources of Mesozoic were also constrained greatly by these two tectonic movements.