珠江口盆地恩平凹陷油气充注期次及时间

应用储层流体包裹技术研究了恩平凹陷油气的成藏规律.结果表明,该区油气主要有两期充注,第一期充注时间较早(20 Ma),以油为主,原油主要来自深部文昌组中深湖相烃源岩,大量油气见于浅层储层;第二期充注时间较晚(5 Ma以后),以天然气为主,天然气主要源自文昌组烃源岩,油气主要分布在深层储集层中.研究认为第一期油气充注与盖层形成时间匹配不好,可能是浅层勘探失利的主要原因之一,因此勘探方向应以深层储层(文昌组)为主,寻找深层早期构造更为重要,是下一步勘探的重要领域.

Hydrocarbon Accumulation Period and Age in Enping Depression,Pearl River Estuary Basin

The characteristics of oil and gas and hydrocarbon accumulation in Enping depression were synthetically analyzed by studying fluid inclusions in the reservoirs.The result showed that there were two stages of hydrocarbon charge in Enping depression,the first charge stage was earlier(~20Ma) and was dominated by oil,the crude oil was mainly derived from wenchang source rock of middle-deep lacustrine facies,the oil formed in this stage was largely found in the shallow reservoir;the second charge stage was later...