塔里木盆地走滑断裂构造变形特征及油气意义——以顺北地区1号和5号断裂为例

塔里木盆地顺北地区发育一系列中小尺度的板内走滑断裂,断裂带油气富集,但断裂空间结构、断裂演化及其对断控缝洞型储层的控制机理尚不明确.以富含油气的顺北1号断裂与顺北5号断裂为研究对象,对走滑断裂垂向构造样式、平面分段样式、空间结构开展系统研究,并结合生产动态资料深入探讨了走滑断裂构造变形对油气富集的控制作用.基于重要构造...

Structural deformation characteristics of strike-slip faults in Tarim Basin and their hydrocarbon significance: a case study of No.1 fault and No.5 fault in Shunbei area

A series of small and medium-scale intraplate strike-slip faults are developed in the Shunbei area of Tarim Basin, and the fault zone is rich in oil and gas. However, it is unclear about the spatial structure and evolution of the faults, and their control mechanisms on fault-controlled fracture-vug reservoirs. Taking the hydrocarbon-rich Shunbei No.1 and Shunbei No.5 faults as examples, this paper systematically studies the tectonic style of vertical structure, plane segmentation style, and spatial structure of the strike-slip faults, and probes into the control effect of the tectonic deformation of strike-slip faults on hydrocarbon accumulation based on production performance. According to the characteristics of key tectonic revolution periods and lithologies, this paper divides the Paleozoic strata in the Shunbei area into six structural layers, and proposes that the strike-slip faults in different structural layers have the characteristics of layered deformation and staged evolution. The vertical structural sequence of the Shunbei No.1 fault is relatively simple, the number of planar sections in deep linear strike-slip faults is few, and the longitudinal spatial structure association of the fault is simple. The vertical structural sequence of the Shunbei No.5 fault is complex, and a set of gypsum rock detachment structures is developed. The tectonic deformation characterized by layered deformation and staged evolution leads to a complex spatial structure of faults. Meanwhile, the tectonic style of strike-slip faults in different structural layers plays an important role in controlling the accumulation elements of fault-controlled fracture-vug reservoirs. The difference in planar segmentation, longitudinal structure, activity intensity and spatial structure of strike-slip faults is the fundamental reason for the difference in hydrocarbon enrichment between the Shunbei No.1 and Shunbei No.5 faults.