松辽盆地北部敖古拉–他拉哈断裂带对油气成藏控制作用分析

Analysis on the Control of Aogula-Talaha Fault Belt in the North of Songliao Basin on Hydrocarbon Accumulation

敖古拉–他拉哈断裂带附近已发现有利油气聚集区沿断裂带串珠状分布,呈现出对断裂带较强的依赖性。搞清断裂带构造几何学、运动学特征,及生排烃期断层启闭性,对于断裂带附近油气资源发现具有重要意义。通过平面和剖面的构造演化分析,发现断裂带纵向四期、平面两期构造变形期次,对比分析发现断裂带对油气成藏控制作用具有“北强南弱”的特征,同时,沿断裂带分析发现多处构造变换带特征,油气聚集条件有利,为断裂带控藏区滚动增储和开发部署提供理论依据。

Beneficial oil and gas accumulation areas have been discovered near the Aogula Talaha fault zone, distributed in a bead like pattern along the fault zone, showing a strong dependence on the fault zone. Understanding the structural geometry and kinematic characteristics of fault zones, as well as the opening and closing characteristics of faults during hydrocarbon generation and expulsion periods, is of great significance for the discovery of oil and gas resources near fault zones. Through the analysis of the structural evolution of the plane and profile, it was found that the fault zone had four stages of vertical and two stages in the plane of tectonic deformation. Comparative analysis revealed that the control effect of the fault zone on oil and gas accumulation was characterized by “strong in the north and weak in the south”. At the same time, multiple structural transformation zones have been discovered along the fault zone, providing favorable conditions for oil and gas accumulation, and providing a theoretical basis for the rolling increase of reserves and development deployment in the oil and gas accumulation controlled by fault zone areas.