【摘要】 富烃凹陷是当今油气勘探的主战场,中国近海已发现的油气储量主要集中在14个富烃凹陷中。利用钻井、测井、地震及化验测试等资料,结合最新油气勘探成果,从温压系统、储盖组合、热流体活动及油气输导与聚集等方面分析、总结了中国近海典型已证实富烃凹陷的油气成藏特征。研究表明:中国近海富烃凹陷深层超压普遍发育,地温梯度高,复合型温压系统构成,为油气成藏提供了充足的动力;主力储层物性好,发育1～2套优质的区域性盖层,至少存在2套有利的储盖组合;发育多种类型的烃类包裹体,油气主成藏期集中,并存在快速幕式充注现象;发育高效优势输导体系、多种圈闭与油气藏类型,存在多种油气成藏模式,油气呈带状差异富集与分布。更多还原

【Abstract】 The hydrocarbon-rich depression is the main object for hydrocarbon exploration at present.Most discovered hydrocarbon reserves in offshore China are distributed in 14 hydrocarbon-rich depressions.By using the data of drilling,well logging,seismic and testing and combined with the newest results of petroleum exploration,the hydrocarbon accumulation characteristics,such as geotemperature-geopressure system,reservoir-caprock assemblage,thermal fluid activity and petroleum conduit and accumulation,of some typical verified hydrocarbon-rich depression in offshore China have been studied.The research indicates that the hydrocarbon-rich depressions in offshore China usually develop overpressure in deep formations with high geothermal gradient and multiple geotemperature-geopressure system in vertical,which can provide enough driving force for its hydrocarbon accumulation.It has at least two favourable reservoir-caprock assemblages with a good reservoir property and one or two excellent regional seals.These depressions often developed many kinds of hydrocarbon inclusions,and had an unify hydrocarbon accumulation period accompanying fluid episodic filling rapidly.The hydrocarbon-rich depressions in offshore China existed predominant conduit system with high efficience,many kinds of trap and pool and multiple hydrocarbon accumulation models,and its hydrocarbons were enriched differently in a banded distribution pattern.更多还原