文昌A凹陷恩平组异常高压与油气成藏关系
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摘要
综合应用地质、地震、地球化学及井筒岩电等资料,运用成藏动力学等手段,对文昌A凹陷恩平组异常高压的分布、成因及其与油气成藏的关系进行了系统研究。结果表明:凹陷中心恩平组普遍发育异常高压,超压形成的主要原因是早渐新世泥岩快速沉降形成的欠压实作用及后期的生烃作用;恩平组高压幕式排烃、运移形成珠海组、珠江组2套有利的成藏组合,其中珠海组二、三段是处于正常压力带—压力过渡带的低孔低渗成藏组合,珠江组是处于正常压力带的成油组合,这2套成藏组合具有不同的运移特征及成藏期次,形成了"凹中深层聚气、斜坡聚油气及隆起聚油"的油气分布格局。根据上述新认识提出了2种成藏模式,即陡坡带垂向运聚模式和缓坡带垂向+侧向运聚模式,认为凹陷北部缓坡带和珠三南断裂下降盘是下步勘探的重要方向。
By comprehensively using several kinds of data,such as geology,seism ic,geochem istry and w ellbore rock-electricity, and applying the approach of hydrocarbon accum ulation dynam ics,the distribution, origin of abnorm ally high pressure in E nping Form ation and its relationship w ith hydrocarbon accum ulation in W enchang A sag,Zhu III depression,w ere system atically studied.The results are as follow s: Abnorm ally high pressure generally develops in E nping form ation w ithin the center of the sag,and its m ain origin m ay be the undercom paction resulted from rapid subsidence of Low er Oligocene m udstone and the late hydrocarbon generation; The episodic hydrocarbon expulsion and m igration under high pressure in E nping Form ation have resulted in favorable plays in Zhuhai and Zhujiang Form ation, w ith ZH-Ⅱ and ZH-Ⅲ M em bers and Zhujiang Form ation respectively being a play w ith low porosity and perm eability in norm al-transition pressure zone and an oil play in norm al pressure zone.These tw o plays are different in m igration pattern and accum ulation periods,w hich has led to a hydrocarbon distribution of "gas in the deep sag,oil and gas on the slope and oil on the uplift". From these new concepts, tw o m odes of hydrocarbon accum ulation are presented, i. e. a vertical m igration-accum ulation m ode on the steep slope and a vertical-lateral m igration-accum ulation m ode on the gentle slope,and the north gentle slope in the sag and the dow nthrow n side of Zhu III south fault are considered as the im portant targets in the next hydrocarbon exploration.
引文
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