构造迁移及其对油气成藏的影响——以渤海渤东、庙西凹陷为例

Tectonic transport and its impact on hydrocarbon accumulation:two cases of Bodong and Miaoxi sag

以渤海渤东、庙西凹陷为例,综合利用钻井、地震等资料,从地层分布、控凹断层活动性以及沉积、沉降中心的变化等方面分析了渤海湾盆地东部的构造迁移特征,探讨了构造迁移对油气成藏的影响。渤东、庙西凹陷不同时期的地层分布、控凹断层活动性以及沉积、沉降中心具有从东向西、从南向北逐渐迁移的特点,构造迁移影响了不同时期烃源岩的分布、热演化程度以及油气资源的分布;渤东西洼、庙西西洼和庙西北洼是3个潜在富烃洼陷,具有很大的勘探潜力。

Taking Bodong and Miaoxi sag as two examples, the tectonic transport features in the eastern Bohai bay basin were analyzed from the stratigraphic distribution, the activity of control- ling-sag faults and the depocenter change, and the tectonic transport impacts on hydrocarbon accumu- lation were discussed, by comprehensively using drilling and seismic data. In these two sags, the stratigraphic distribution, the activity of control- ling-sag faults and the depocenter change during various periods are characterized by the gradual mi- gration from east to west and from south to north, and this tectonic transport has made an impact on the source-rock spread and maturity and the distri- bution of hydrocarbon resources. Notably, there are three potential hydrocarbon-rich subsags, in- eluding the west Bodong, the west Miaoxi and the north Miaoxi, with their exploration potential quite great.