盐下地震相识别优质烃源岩

An Identification of High Quality Source Rocks by Seismic Facies Under Salt Bed

根据地震资料,对西非南加蓬次盆裂陷盆地盐下Barremian阶地层的追踪解释。在井资料少的情况下,借助地震特征识别出优质烃源岩地震相特征主要为强振幅、低频、连续性好、平行或亚平行的反射特征。通过对地震相和沉积相的分析,建立了Barremian阶Melania组中下部的那套烃源岩地震相与沉积相的转换模式,并对南加蓬次盆Barremian阶优质烃源岩的分布进行预测,研究表明南加蓬次盆Barremian阶优质烃源岩主要分布在Leopard西北部地堑区、N’komi东北部地堑区和N’komi西南部地堑区以及Leopard东部地堑区。

Based on the seismic data,the seismic stratigraphic interpretation is accomplished for the Barremian stage in the south of Gabon basin of western Africa. According to the seismic features,the features of seismic facies for high quality hydrocarbon source rocks will present us a strong amplitude, including low frequency with well cotinuity and parallel or sub-parallel in the case of lacking the drilling data. Based on the analysis of the relationship between the seismic facies and sedimentary facies, the conversion mode is established in Barremian stage Melania group. Meanwhile, the distributions of high quality hydrocarbon source rocks of Barremian in Gabon basin are predicted. The research shows that the high quality hydrocarbon source rocks of Barremian in Gabon basin are distributed in the graben of northwest Leopard,including the graben of west Leopard,the graben of northeast Nkomi and the graben of southwest Nkomi.