珠江口盆地西部区域的珠三坳陷文昌组和恩平组地层具有巨大的生烃潜力,但在勘探中一直未有重大发现,对油气运移聚集等问题认识不清楚.为此,在WC-A凹陷、WC-B凹陷和WC-C凹陷认识的基础上,开展了以精细构造解释研究为基础的大比例尺工业制图、构造特征研究、油气运移及聚集规律等技术攻关,进一步深化了珠三坳陷油气分布特征及油气成藏规律认识.WC区伴随着珠三坳陷断陷、断坳和坳陷的演化,经历了特殊的演化过程,具有先正后逆的独特构造演化特征,形成了wc浅层反转背斜构造.通过对WC反转背斜构造成藏匹配关系的分析,认识到WC反转背斜构造形成时间晚于烃源岩大量生排烃时间,油气的供给主要来源于后期近东西向和北两向断层对早期油气藏的再分配.%There is great hydrocarbon generating potential in Wenchang Formation and Enping Formation of Zhu Ⅲ Depression in western area of Zhujiangkou Basin, but no significant exploration discovery has been made due to insufficient understanding of hydrocarbon transportation and accumulation. Based on the understanding of WC-A,WC-B and WC-C sag, large scale industrial cartography, structural characteristics research and regulation of hydrocarbon transportation and accumulation are studied on the basis of fine structure interpretation, and the hydrocarbon distribution and reservoir formation in Zhu IⅢ Depression is better understood. The evolution in WC area takes different progress along with faulting, subsidence and depression of Zhu Ⅲ Depression, which is featured by normal faulting before reverse faulting and forms shallow reversal anticline structure. Through the analysis of matching relationship of WC reversal anticline structure and reservoir formation, it is realized that reversal anticline structure formation is later than substantial hydrocarbon expulsion of source rock and that the source of hydrocarbon is from the redistribution of early hydrocarbon reservoir through late EW and NE faults.
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