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通过详细的油气地质特征研究及油 (气 )源对比 ,确定了珠三坳陷的主力生、储、盖层。根据广义的油气系统概念和研究方法 ,结合构造和沉积特征分析 ,对坳陷进行了油气系统研究。研究表明 ,在不同的地质历史阶段 ,珠三坳陷中油气系统发育具有不同的特征 ,即早期 (渐新世晚期—早中新世 )只在文昌 A凹陷中发育一个石油系统 ,而到了晚期 (中中新世—上新世 )则在多个凹陷及凸起上发育多个油气系统。此外 ,对每个油气系统的特征及其中的油气运移规律和成藏特征进行了探讨 ,并提出了勘探建议。
Through the detailed study on the geologic characteristics of oil and gas and the comparison of oil and gas sources, the main formation, reservoir and caprock of the Zhuansan Depression are identified. According to the generalized concepts and research methods of petroleum system, combined with the analysis of tectonic and sedimentary characteristics, the petroleum system of the depression was studied. The results show that there are different characteristics of petroleum system development in the different stages of geological history, that is, the early (Late Oligocene-Early Miocene) developed an oil system only in the Wenchang A depression and the late (Middle Miocene-Pliocene) developed multiple hydrocarbon systems over multiple depressions and bumps. In addition, the characteristics of each oil and gas system as well as the hydrocarbon migration laws and reservoir forming characteristics are discussed, and the exploration suggestions are put forward.