鄂尔多斯盆地东南部宜川—黄龙地区马五段白云岩次生灰化作用特征与成因分析

石灰岩的白云岩化作用因能形成较好的储层而备受关注,以往学者开展大量的分析和研究工作,但对白云岩的次生灰化作用的研究和认识程度均较低。次生灰化是发生在碳酸盐岩中重要的成岩作用类型之一,对储层的储集性能具有显著的影响作用。分析鄂尔多斯盆地东南部宜川—黄龙地区奥陶系马家沟组马五段次生灰岩岩石学特征及其形成的成岩阶段,并对次生灰岩的成因及主控因素进行探讨,指出古地貌低洼部位有利于白云岩次生灰化作用的发生,裂缝体系也是次生灰化作用的控制因素之一,泥晶含膏白云岩在低温条件下易于发生次生灰化作用。这些认识在碳酸盐岩风化壳储层预测方面具有理论指导意义,在油气勘探实践中具有重要的应用价值。

Secondary Limestone Action on Ma5 Member Dolomites in Yichuan-Huanglong Region of Southeastern Ordos Basin

Dolomitization of limestone is paid attention since it improves the reservoir ability,and a lot of works have been done.But,it is paid less attention to secondary limestone of dolomites.The secondary limestone of dolomites is one of the important types of diagenesis in carbonate reservoir research and has great effects on reservoir.In this paper,we measure the petrology of secondary limestones and in the 5th Member of Majiagou Formation,Ma5 Member and the digenetic stage its formation.We discuss the genesis...