Petroleum accumulation conditions in Enping Sag, Pearl River Mouth Basin
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摘要: 恩平凹陷位于珠一坳陷西端,目前虽然有油气发现,但是一直没有获得商业性突破。从油气成藏条件研究出发,通过分析认为生烃洼陷控制了本区油气的平面分布,具有环洼分布、近源聚集的特征;由于断裂活动和烃源岩地层整体向南抬升,造成南部缓坡内带是油气运移的优势方向;本区发育了文昌组、恩平组上段和珠江组—韩江组3套储盖组合,并控制了油气的纵向分布。最后,结合周围已钻井失利原因分析,指出了本区油气藏的成藏条件,建立了油气成藏模式。综合分析认为,恩平凹陷具备良好的油气成藏条件,南部缓坡构造带内带浅层和中央断裂构造带深层是恩平凹陷最有利、最具潜力的成藏区带。Abstract: The Enping Sag locates in the west of the Zhu Ⅰ Depression.Petroleum has been found in the sag;however,no industrial breakthrough has been made.Source depression controls the horizontal distribution of petroleum in the study area.Petroleum accumulates around depression and near to source.Due to fault activity and the southward uplifting of source formation,the southern gentle slope is the favorable target for petroleum migration.3 sets of reservoir and cap combinations have been found in the region,including the Wenchang Formation,the upper Enping Formation,and the Zhujiang—Hanjiang Formation,which control the vertical distribution of petroleum.Based on the experiences from failed wells,the accumulation conditions in the area have been pointed out and the accumulation model has been established.The Enping Sag is favorable for petroleum accumulation.The shallow layers in the southern gentle slope and the deep layers in the central fault belt are the most potential targets for exploration in the Enping Sag.
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