岩性油气藏 ›› 2021, Vol. 33 ›› Issue (4): 5262.doi: 10.12108/yxyqc.20210406
徐宁宁1,2, 王永诗3, 张守鹏2, 邱隆伟4, 张向津5, 林茹6
XU Ningning1,2, WANG Yongshi3, ZHANG Shoupeng2, QIU Longwei4, ZHANG Xiangjin5, LIN Ru6
摘要: 为了明确鄂尔多斯盆地大牛地气田二叠系盒1段致密碎屑岩储层特征及成岩圈闭的发育机制,开展了储层含气性分析、铸体薄片鉴定和碳氧同位素分析,并通过对岩石成岩微观特征分析和定量统计,明确了研究区二叠系盒1段气层段和干层段的岩石学特征和成岩-孔隙演化的差异性,阐释了成岩圈闭发育机制。结果表明:①大牛地气田二叠系盒1段干层段比含气段的石英颗粒体积分数低15%左右,填隙物以方解石胶结物和假杂基为主。干层段主要分布于沿主河道方向的2个沉积中心之间的过渡地带、横向河道边部以及较为孤立的透镜体砂岩中。②研究区成岩圈闭封堵层按照成因差异可划分为钙质胶结交代型和压实压溶硅质胶结型,前者方解石胶结特征显著,在成藏期前(中晚侏罗世—白垩世)达到致密程度;后者颗粒间紧密接触,假杂基化特征显著,表现为“边成藏边致密”,储层致密化和油气充注同时发生。③研究区2类圈闭的形成得益于2方面,一是具有良好的储层致密化-成藏耦合关系,二是中成岩A1期的大规模方解石胶结和高塑性岩屑含量导致的持续减孔效应。该研究成果对具有类似地质条件的成岩圈闭勘探具有借鉴作用。
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