CHARACTERISTICS OF PRECENOZOIC AND CENOZOIC FAULT SYSTEMS UNDER A TENSILE STRESS FIELD IN WESTERN BOHAI SEA AND THEIR CONTROL OVER HYDROCARBON RESERVOIRS
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摘要:
渤海西部发育NE、NW、EW向3组断裂体系，NE、NW向断裂形成了复杂的共轭断裂体系，断裂系统的复杂性直接影响了区内油气差异富集。在区域应力场特征研究基础上，基于伸展背景下先存共轭—新生断裂物理模拟实验，对先存构造控制下新生断裂体系特征及控藏作用进行了研究。研究区深、浅部构造的耦合是“区域应力场、先存基底形态”共同决定的，地幔热活动对区域应力场的影响更加明显，并导致区内主要以伸展作用为主。先存断裂在近SN向斜向伸展作用下，断裂选择性复活。先存构造走向与区域伸展作用力方向的差异，导致同一断层不同段的应力性质存在不同，并直接影响油气的聚集与保存。先存断裂与近SN向拉伸方向的夹角越大，断裂的伸展分量越强，以拉张作用为主，有利于油气浅层聚集，反之，则走滑分量增强，以走滑作用为主，有利于深层油气保存。
Abstract:Three groups of fault systems extending in NE, NW and EW directions respectively are well developed in the west of Bohai Sea. The NE and NW faults are from a complex conjugate fault system. The complexity of the fault system directly affects the differential enrichment of oil and gas in the region. Based on the study of regional stress field and the physical simulation experiment for preexisting conjugate faults under an extensional regime, this paper aims to reveal the characteristics of the Cenozoic fault system controlled by the preexisting structure and its influence on oil and gas reservoir formation. It is clarified that the coupling of deep and shallow structures in the study area is jointly determined by the regional stress field and pre-existing basement morphology. The influence of mantle thermal activity on regional stress field is obvious, which leads to the regional extension of the study area. Under the extensional action of the syncline nearly in SN direction, some of the pre-existing faults are selectively reactivated. The difference between the strike of pre-existing structure and the direction of regional extension force leads to different stress properties in different sections of a fault, and directly affects the accumulation and preservation of oil and gas. The larger the angle between the pre-existing fault and the near SN stretching direction, the stronger the extension component of the fault will be. Tensional faults are conducive to oil and gas accumulation in the shallow layer. On the contrast, once the strike slip component is enhanced and dominated, it will be conducive to oil and gas accumulation and preservation in the deep.
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Key words:
- pre-existing structure /
- conjugate fault /
- reservoir control /
- extensional stress /
- west of Bohai Sea
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