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珠江口盆地西部文昌B凹陷及周边已发现油田具有“复式”油气聚集特点;该区发育珠江组滨海潮坪及三角洲砂-背斜成藏组合、珠海组扇三角洲砂-断背斜及断块成藏组合以及文昌、恩平组扇三角洲及浊积砂成藏组合等3套主力成藏组合;珠海组二段具有“断-砂优势输导和断背斜、断块成藏”模式,珠江组具有“长距离汇聚、背斜成藏”模式。在上述认识基础上,预测了各成藏组合的有利勘探区带及潜力目标。文昌B凹陷南断裂带下降盘X构造和琼海凸起Y构造的钻探成功,证实了钻前对该区成藏组合及有利区带的认识。
The discovered oil field in the Wenchang B depression and its periphery in the west of the Pearl River Mouth Basin has the characteristics of “complex” oil and gas accumulation. In this area, the coastal tidal flat and delta sand-anticline assemblage of the Pearl River Formation, the sand-faulted anticline of the Zhuhai Formation fan delta Block assemblage and three main reservoir assemblages such as Wenchang, Enping Formation fan delta and turbidite sand accumulation assemblage. The second member of Zhuhai Formation has the advantages of “fault-sand dominant transport and faulted anticline and fault block accumulation” Mode, the Pearl River Group has “long-distance convergence, anticline into reservoir ” mode. On the basis of the above understanding, the favorable exploration zones and potential targets of each reservoir combination are predicted. The success of the X-shaped descent disk in the southern fault zone of Wenchang B depression and the drilling of Y structure in Qionghai Boulder confirm the understanding of the pre-drill formation and favorable zones in the area.