INVESTIGATION ON PREDICTION METHODS OF FAVORABLE AREA FOR PETROLEUM MIGRATION AND ACCUMULATION——TAKING THE DONGYING SAG OF BOHAI BAY BASIN AS AN EXAMPLE
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摘要: 通过对渤海湾盆地东营凹陷地质历史上主要石油地质演化阶段的地层孔隙流体压力场研究,以及东营凹陷勘探现状、沉积特征、东营剥蚀期和明化镇剥蚀期剥蚀卸载引起的砂岩回弹量和地层孔隙流体古压力场变化的关联性分析,提出了针对主要由砂岩和泥岩组成的含油气盆地预测石油运移聚集成藏有利区的2种较有效的方法:1)通过地质历史上盆地持续沉降成烃后的盆地整体上升剥蚀阶段的烃源岩区和储集岩区的压力场分化动态分析研究,预测石油运移的有利方向;2)通过地质历史上盆地持续沉降成烃后的盆地整体上升剥蚀阶段的砂岩回弹量的动态分析,同时结合地质历史上该阶段储盖层的配置研究预测石油聚集成藏有利区.Abstract: Integrated researches of formation pore fluid pressure field on main geological evolution stages occurred in the Dongying Sag of the Bohai Bay Basin,its exploration status and sedimentary characteristics,sandstone rebounding amount caused by the erosion unloading during the Dongying phase of the Oligocene and the Minghuazhen phase of the Pliocene and their interaction analysis of formation pore fluid paleo-pressure field,the paper proposes 2 more effective methods of predicting hydrocarbon migration and accumulation for petroliferous basins which are mainly composed of sandstone and mudstone.Two methods are follows as:1)Predicting favorable direction of petroleum migration based on dynamics research of pressure field differentiated of hydrocarbon rocks reservoir area at stages of basin uplift denudation after forming hydrocarbon by sustainable subsidence;2)Predicting favorable zones of hydrocarbon accumulation based on dynamics research of sandstone rebounding amount at stages of basin uplift denudation after forming hydrocarbon by sustainable subsidence,and meanwhile,combining with the distribution of reservoir cap rocks at the same stage in geological time.
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