应用成岩岩相分析法研究非均质性储层

The Research on Heterogeneous Reservoir by the Analysis Technique of the Diagenetic Lithofacies

储层研究表明后期成岩作用是形成靖安油田非均质性较强的主要原因 ,因此 ,对非均质储层的研究应该注意储层的成岩作用的影响。应用成岩岩相分析方法 ,通过沉积微相分析以及大量岩石显微薄片观察 ,将陕北盆地北部靖安油田长 6储层的成岩相总结为 6种常见类型 ,并分析了 3种沉积序列与成岩相的关系。第Ⅰ种沉积序列为叠置水下分流河道微相 ,主要发育绿泥石 -浊沸石胶结相 ,在叠置水下分流河道靠近湖盆一侧 ;第Ⅱ种沉积序列为水下分流河道微相 ,主要发育绿泥石 -方解石胶结相 ;第Ⅲ种沉积序列为水下分流间湾微相 ,主要发育钙质 -泥质胶结相。结合上述分析 ,作出长61 2 和长 621 两个重点含油层位储集层成岩相的平面展布 。

The Diagenesis is the main reason for very strong heterogenous reservoir in Jing′an oilfield. So we should pay attention to the influence of diagenesis on heterogenous reservoir. This article builds six common diagenetic lithofacies of Chang 6 reservoir in Jing′an oilfield of the north basin of Shanbei by the analysis of diagenetic lithofacies, and discusses three kinds relationship between deposition sequence and diagenetic lithofacies, through analyzing sedimentary micro-facies and observing many thin sections. The first kind deposition sequence is the superposition underwater distributary, forming chlorite and Laumontite cementation near the side of lake. The second deposition sequence is underwater distributary, forming chlorite and calcite cementation. The third deposition sequence is underwater river-bay, forming calcium and mud cementation. According to the above mentioned, authors work out the plane distribution of diagenetic lithofacies for Chang 6~1_2 and 6~2_1 reservoirs and predict the benefit areas.