神狐隆起WC15-1构造油气成藏模式探讨

Study on Petroleum Accumulation Patterns in WC15-1 Structure in Shenhu Uplift

从油气藏形成的地质背景、原油类型和烃源岩演化过程等方面,对神狐隆起WC15-1油气藏原有的3种油气运聚模式进行了深入分析,认为前人研究所得出的3种模式均存在一定的缺陷。在对珠三坳陷的充填演化、凹陷结构及珠三南断裂研究的基础上提出了WC15-1构造油气成藏的新模式。研究认为,WC15-1油气藏油气主要来源于文昌C凹陷文昌组。该构造油气成藏模式的准确建立对文昌C凹陷本身及类似的边缘凹陷油气勘探具有重要的意义。

From the aspects of geology background of reservoir development,crude oil types and source rock evolution process,etc.,the original three types of petroleum migration and accumulation patterns in WC15-1 reservoir in the Shenhu Uplift were further analyzed. The study results indicate that the original three patterns all have some defects. Based on the studies of infilling evolution,structures of the Zhu 3 Depression and the Southern Zhu 3 faults,new petroleum accumulation pattern of WC15-1 structure was proposed. According to this study,petroleum in WC15-1 reservoir was mainly from Wenchang Fm in the Wenchang C sag.The accurate establishment of this structural reservoir accumulation pattern has significant means for petroleum exploration in the Wenchang C sag and similar marginal sags.