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在区域构造作用方式和方向产生变化及复杂边界条件的综合影响下,分析复杂构造变形及所形成构造的特征及其油气成藏.本文以黄金带油田为例,利用新处理的高品质三维地震资料,对本区构造特征进行精细刻画,分析应力场演化,并探讨构造对油气成藏条件的控制作用.认为本区沙三期存在北西-南东向的伸展构造作用;东营期为走滑构造变形体制,最大主压应力方向为近东西向,表现为北东向右旋走滑、东西向挤压和南北向伸展的构造变形特征,同时,二界沟断层作为构造带边界对局部应力场的方向造成改变.研究结果表明:在复杂的应力条件下,伸展构造、走滑构造、挤压构造、反转构造在本区均有发育,并存在特殊的构造现象:断层与褶皱枢纽的走向出现规律性渐变、走滑断层平直段存在“海豚效应”现象.结合区域应力场的变化以及构造带边界的影响,构造变形叠加和复杂的先存构造条件是产生复杂构造现象的原因.构造活动与油气成藏在时间上相契合,对油气成藏与保存起到了至关重要的作用.
Under the combined influence of regional tectonic mode of action and direction change and complex boundary conditions, the complex tectonic deformation and the characteristics of the tectonic formations and their hydrocarbon accumulation are analyzed.In this paper, taking the Huangjinzhai oilfield as an example, the newly-treated high-quality 3D seismic Data of the tectonic features of this area to describe the evolution of the stress field and to explore the tectonic controls on hydrocarbon accumulation conditions.It is concluded that there is a NW-SSE extensional tectonics in the third member of this area and a strike-slip structure Deformation system, the direction of maximum principal compressive stress is near east-west, which shows the tectonic deformation features of northeastward dextral strike-slip, east-west extrusion and north-south extension. At the same time, the Erjiangou fault acts as a boundary between the structural zone and the local stress field The results show that under the complicated stress conditions, extensional structure, strike-slip structure, crushed structure and inverted structure all develop in this area, and there are some special tectonic phenomena: the strike of fault and fold hinge There is regular gradual change, and the “dolphin effect” phenomenon exists in the straight section of the strike-slip fault.According to the change of regional stress field and the influence of tectonic zone boundary, the deformation stack And the complex structure of pre-existing conditions is the cause of the phenomenon of complex structures. Tectonic activity and hydrocarbon accumulation in time relative fit of hydrocarbon accumulation and preservation has played a crucial role.