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北部湾盆地涠西地区于W4井渐新统涠洲组三段获高产工业油气流,实现了北部湾盆地新区油气勘探突破。通过对W4井古近系原油及相关钻井岩心样品实验测试结果的研究,结合区内勘探新资料与邻区原油测试成果,重点开展了油源对比与成藏主控因素分析。研究认为,涠西地区W4井涠洲组三段油气藏属于断块型油气藏,其原油来自于母质类型较好的流沙港组成熟烃源岩,油气成藏受控于断层侧向封堵与盖层条件2个关键因素。
The Beixi Basin in the Beibu Gulf Basin achieved high-yield industrial oil and gas flow in the third member of the Weifang Formation in the W4 well, achieving a breakthrough in oil and gas exploration in the Beibu Gulf Basin. Through the study of the experimental results of Paleogene oil from W4 well and related drilling core samples and the combination of new exploration data in the area and the results of crude oil testing in the neighboring areas, the main control factors of hydrocarbon source contrast and accumulation are analyzed. The study shows that the third member of the Weizhou Formation in the W4 well in western Guangxi is a fault block type reservoir. The crude oil comes from the mature source rock of the Liushagang Formation with good parental quality. The hydrocarbon accumulation is controlled by lateral sealing of the fault Two key factors with cover conditions.