西非加蓬B区块盐下Gamba组储层发育特征研究

Study on the reservoir characteristics of the sub-salt Gamba Formation in Block B of Gabon,West Africa

通过钻测井、岩心及分析化验等资料,对Gamba组砂岩开展储层发育特征综合研究,结果表明:储层以中孔—中低渗为主,岩石学特征差异导致的成岩作用不同是造成区块盐下Gamba组储层横向变化的主要原因。N-1井Gamba组抗压实能力较强,保留了部分原生孔隙,同时在成岩过程中强烈的长石溶蚀作用对储层物性具有明显的积极作用,产生大量次生孔隙,储层物性优于L-1B及L-2井。

Based on the data of drilling and logging,core analysis and previous research results,carried out the comprehensive study of reservoir development characteristics.The results show that:The reservoir is dominated by medium porosity and mediumlow permeability.Different diagenesis caused by different petrological characteristics is the main reason for the lateral change of Gamba Formation reservoir.The Gamba Formation of well N-1 has strong anti compaction ability and retains some primary pores.At the same time,the strong feldspar dissolution in the process of diagenesis has a significant positive effect on the physical properties of the reservoir,producing a large number of secondary pores.The physical properties of the reservoir are better than those of well L-1B and well L-2.