杨娇,戴建文,吴雪晴,涂乙,董硕,李琦

• 1:中海石油(中国)有限公司深圳分公司

摘要(Abstract)：

为了厘清菱铁矿胶结物的成因，研究菱铁矿胶结物对储层的影响及其储层地质模式，探讨含菱铁矿的储层对于油田开发生产的影响，开展菱铁矿胶结物成因及对物性的影响研究。基于常规岩心、薄片鉴定、X衍射等资料，对珠江口盆地恩平油区中浅储层胶结物类型及特征统计发现，该区菱铁矿胶结物富集。通过古海洋氧化还原状态和沉积环境研究了其成因机制，并定量研究了菱铁矿对储集层质量的影响。结果表明：研究区储层中菱铁矿是成岩作用过程中由有机质降解产生的CO_2与孔隙水中富集的Fe~(2+)结合的产物，形成于砂岩原生孔隙发育的早成岩期，对储层整体孔隙的保存具有积极意义；但菱铁矿胶结的局部(多发育于薄层泥质条带中),由于其占据了较大比例的原生孔隙空间，对储层具有较大破坏性。菱铁矿胶结物的“控渗”作用使泥质条带处纵向渗透率远远低于其他方向渗透率，从而大大增加了泥质薄层对底水的遮挡效果。研究成果在B油田进行应用时发现，富菱铁矿胶结物含水平条带状夹层导致高部位出现能量供给不足，通过“自源闭式助流注热水”用以增能，促使油田产量翻番，大幅提高油藏采出程度。

关键词(KeyWords)： 珠江口盆地;恩平油区;中浅层油藏;菱铁矿;胶结物;渗透率;泥质薄层

Abstract:

Keywords:

基金项目(Foundation): 中海石油(中国)有限公司深圳分公司项目(CCL2022SZPS0130)

作者(Author): 杨娇,戴建文,吴雪晴,涂乙,董硕,李琦

DOI: 10.19509/j.cnki.dzkq.tb20210574

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