FAULT CHARACTERIZATION AND RESERVOIR FORMING UNDER CONTROL OF “SOURCE-FAULT-TRAP”: A CASE OF THE BOUNDARY FAULTS IN THE SOUTHERN PART OF MIAOXINAN UPLIFT
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摘要:
为研究庙西南凸起南侧断阶带油藏油气差异分布规律，快速寻找油气高丰度区，结合该区油气成藏期，新建立了一套适用于研究区断裂高效输导效率的确定方法。通过新采集处理的三维地震资料，结合已有的钻井和测井资料，从几何学和运动学方面对该构造的4条边界断裂进行精细刻画研究，结果表明F1和F2断裂不存在凸面脊，且油气成藏期活动速率小，不利于油气向上输导；F3断裂在油气成藏期最大活动速率达106 m/Ma，并与断裂凸面脊重合，油气输导效率较高；F4断裂存在的凸面脊在油气成藏期活动速率为63 m/Ma，油气高效输导效率次之。最后结合烃源岩和断圈配置的关系，确定F3断裂具有较好的“源-断-圈”耦合关系，对应的W圈闭具有较大可能成为油气高丰度区块。该方法不仅在渤海秦皇岛33构造区和旅大16构造区的勘探中得到了较好的应用，而且也将为渤海地区下一步浅层油气的勘探提供重要的参考意义。
Abstract:In order to reveal the petroleum distribution pattern in the southern part of the Miaoxinan Uplift so as to quickly find some oil and gas enriched areas, various approaches are used to seek for favorable paths for efficient migration and accumulation of oil and gas, based on the hydrocarbon reservoir forming stages established for this area. Four boundary faults are depicted meticulously in geometry and kinematics by the recently collected and processed 3D seismic data, the completed well information and logging data. The results show that the faults F1 and F2 have no convex surface ridge, and their activity rate is too small in the period of hydrocarbon reservoir formation, and thus they are disadvantaged for hydrocarbon to migrate up to higher position. However, the F3 fault has an obvious convex surface ridge and most of the activity rate may be as high as 106 m/Ma, so the oil and gas transporting efficiency of this fault is relatively high. The fault F4 has also some convex surface ridges and the activity rate is 63 m/Ma, so it is advantaged for hydrocarbon migration to higher position. Finally combining source rock and the disposition relationship between faults and traps, it is concluded that the fault F3 has good coupling relationship of “source-fault-trap”, and the trap W in the step-fault zone of the southern part of Miaoxinan Uplift has bigger potential in oil and gas enrichment. This method is not only applied in the exploration of QHD33 and LD16 areas of the Bohai Sea, but also provide important reference for oil and gas exploration in the Bohai area.
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