超压盆地油气垂向运移高度研究

发布时间：2018-03-01 08:06

本文关键词： 超压断层水头起始位置垂向运移高度　出处：《地质学报》2017年07期 　论文类型：期刊论文

【摘要】：在超压盆地中,当断层活动断开超压烃源岩时,油气会沿断层面发生涌流式垂向运移,这一瞬态涌流过程为油气大规模运聚成藏提供了重要的油气来源。然而,对于油气沿断层垂向运移距离问题的研究,停留在定性分析阶段,较少考虑到断层开启时造成的泄压作用,也很少区分地层水和油气运移距离的差异。本文认为,油气顺断层向上运移的距离主要由源岩超压带内超压幅度决定,油气垂向运移理论高度可由超压幅度折算,因而超压幅度越大,油气垂向运移距离越远,油气上涌顶界面埋深越浅。油气初次上涌的起始位置不是地表面,而是有效烃源岩顶面。另外,由于油气的大量上涌,超压带快速泄压,大部分油气上涌实际距离不能达到理论上涌的最大距离。同时,考虑到沿断层运移时受到阻力作用,油气实际上垂向运移高度远远小于理论运移高度。
[Abstract]:In the overpressure basin, when the fault disconnects the overpressure source rock, the oil and gas flow along the fault plane will occur an inrush vertical migration, which provides an important source of oil and gas for the large-scale migration and accumulation of oil and gas reservoir. The study on the vertical migration distance of oil and gas along the fault stays at the stage of qualitative analysis, and seldom considers the pressure relief caused by the fault opening, and seldom distinguishes the difference between the formation water and the migration distance of oil and gas. The distance of upward migration of oil and gas along the fault is mainly determined by the amplitude of overpressure in the overpressure zone of source rock. The theoretical height of vertical migration of oil and gas can be converted from the amplitude of overpressure, so the larger the amplitude of overpressure, the longer the distance of vertical migration of oil and gas. The deeper the interface of oil and gas upwelling is, the shallower it is. The starting position of the initial upwelling of oil and gas is not the surface of the ground, but the top surface of the effective source rock. In addition, because of the large upwelling of oil and gas, the overpressure zone releases the pressure rapidly. Most of the actual distances of oil and gas upwelling can not reach the theoretical maximum. Meanwhile, considering the resistance to migration along the fault, the vertical migration height of oil and gas is much lower than the theoretical migration height.
【作者单位】：中国石油大学油气资源与探测国家重点实验室;中国石油大学地球科学学院;中国石油冀东油田公司;中国科学院地质与地球物理研究所;
【基金】：国家油气专项(编号2011ZX05001-001-04)资助成果
【分类号】：P618.13

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