潮汕坳陷中生界含油气系统

中国近海油气勘探中,至今没有发现完全由中生界形成的含油气系统。潮汕坳陷为中生界的残留坳陷,埋藏浅,为揭示潮汕坳陷的成藏特征以及有利勘探区带,从烃源岩、储盖组合、断裂特征、构造特征等基本石油地质条件出发,分析了钻井失利的原因,对油气成藏规律和成藏模式进行总结,通过成藏条件对比,指出中央隆起带为有利勘探区带,同时分析其成藏风险,并为下步工作提出建议。

Analysis of Mesozoic hydrocarbon-bearing system in Chaoshan depression

Up to now,hydrocarbon-bearing system fully formed from Mesozoic has not been found in China offshore oil and gas exploration.Chaoshan depression is a residual depression in Mesozoic group,with shallow buried depth.In view of revealing the accumulation characteristics and favorable exploration zones of Chaoshan depression,starting from the basic petroleum geological conditions,such as hydrocarbon source rocks,reservoir-seal assemblage,fracture characteristics,tectonic characteristics,and etc.,drilling failure reasons have been analyzed,and hydrocarbon accumulation regularities and reservoir forming models have been summarized.By comparison with accumulation conditions,the central uplift belt has been pointed as the favorable exploration zone.Meantime,reservoir-forming risks have been analyzed,and it provides suggestions for the next step work.