南海琼东南盆地深水区油气勘探潜力

Petroleum exploration potential in abyssal zone of Qiongdongnan Basin, South China Sea

朱廷祥 段铁军

Zhu Tingxiang Duan Tiejun

湖北国土资源职业学院, 武汉430000 2. 中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所, 无锡214126

Hubei Land Resources Vocational College, Wuhan, Hubei 430000, China 2. Wuxi Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

南海琼东南盆地经历了始新世的陆内断陷、渐新世的裂谷和中新世以来的被动陆缘坳陷等3个演化阶段,特别是在深水区形成了断陷期湖相、裂谷期海陆过渡相到海相及被动陆缘坳陷期海相等多套生烃物质;3期构造沉降作用伴随了3次高热流事件,利于烃源岩的成熟;多储集体类型、多套储盖组合,为油气富集提供了广阔的空间;多期构造运动,形成多种圈闭类型,利于油气聚集成藏。

The evolution of the Qiongdongnan Basin in the South China Sea can be divided into three stages including intracontinental rift during Eocene, rift during Oligocene, and passive continental margin depression ever since Miocene. Multiple sets of petroleum generating materials of different facies were deposited in abyssal zone. For example, lacustrine facies in the first stage, marine-continental and continental facies in the second stage, and marine facies in the third stage. Three high thermal fluid events took place during the three evolution stages, contributing to the maturation of source rocks. Multiple types of reservoir and multiple sets of reservoir-cap assemblage provided abundant room for the enrichment of petroleum. Various types of trap formed during stages of tectonic movements were favorable for accumulation.

https://doi.org/10.11781/sysydz201203277