Considering the key problems of complex sediment provenance,rapid facies variation and difficulties in locating and predicting high-quality reservoirs in the Wushi Sag continental rift basin,we have carried out a detailed analysis on the fault evolution stage,plane activity variability along the fault cross-section,and sedimentation system.Using key techniques,such as fine identification and description of marine continental complex fault block/fault,micro landform restoration,and faciescontrolled reservoir prediction,we arrived to the conclusion that the dominant sand-body distribution could be determined from the strike slope formed by differential activity of three NE-direction sedimentary faults.We have also proposed a source-sink time-space coupling model for sand control,and predicted the development of a high-quality reservoir on the downthrown side of the F2 fault.Guided by these results,a new drilling was initiated,which led to the discovery of a major oil reservoir.This has greatly promoted the exploration and development of the Wushi Oilfield.%针对乌石凹陷陆相断陷湖盆物源体系复杂、相变快,难以寻找、预测优质储层分布这一亟待解决的关键问题,开展了断裂演化期次、断层剖面平面活动差异性及沉积体系精细研究.采用海上陆相复杂断块断层精细识别解释、微地貌恢复及相控储层预测等关键技术,获得了研究区内3条北东向控沉积断裂差异性活动形成的走向斜坡具有控制砂体优势展布的重要认识,提出了源-汇时空耦合的控砂模式,预测了F2断层下降盘发育优质储层.在此研究成果的指导下,新钻井获得重大发现,极大地推动了乌石油田群的勘探开发进程.
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