南黄海盆地北部坳陷白垩系地震相分析

在数千公里地震剖面解释基础上,选用频率、振幅、连续性及内部反射结构等4个地震参数,采用“构形 结构 振幅 频率 连续性”的地震相复合命名原则,总结出南黄海盆地北部坳陷白垩系近10种地震相单元,5种沉积相类型。沉积特征分析表明,在没有钻井揭示的白垩系中、下部,其油气潜力有可能比泰州组更加可观,是很好的烃源岩。钻井资料也表明白垩系具有生、聚油过程,这进一步说明白垩系中、下部的生烃潜力。中、新生界的数套物性较好的储、盖层和众多与油气大规模运移时间匹配良好的构造圈闭,使白垩系成为南黄海盆地找油的首要对象。

Cretaceous seismic facies analysis of northern South Yellow Sea Basin

Based on seismic section explanation of thousands of kilometers,the authors selected 4 seismic parameters(frequency,swing,continuity and inner reflect configuration),adopted multiple nomenclative principle of seismic facies of"figure+configuration+swing+frequency+continuity"and generalized 10 seismic and 5 sedimentary facies for the northern sag of South Yellow Sea Basin. Sedimentary characteristic analysis shows that sedimentation ply thick and acreage amplitude of middle and lower parts of Cretaceous have better hydrocarbon source rock. The oil and gas potential of the middle and lower parts of Cretaceous is more considerable than that of Taizhou Group. The drilling data show that the oil generation and accumulation processes may happen in the Cretaceous strata. There developed several suits of source rocks,physically better reservoir,capping and numerous good trapping structures. Cretaceous strata may be the best target for future exploration in this basin.