NNW 油田长3储层沉积微相研究

摘要

NNW oilfield reservoir is mainly controlled by sedimentary microfacies,so reasonable microfacies types and microfacies boundary values are the key to study sedimentary microfacies of the area.Based on the traditional methods for sedimentary microfacies,the methods of dominant sedimentary facies and cross plots are introduced to divide sedimentary microfacies and determine sedimentary microfacies boundary.The results show that the Chang3 reservoir can be divided in-to two sedimentary microfacies of distributary channel and distributary bay,and 0.5 is the more reasonable sedimentary mi-crofacies boundary parameters of three sedimentary units of Chang3 1 ,Chang32 and Chang33 .Finally sedimentary microfa-cies maps are drawn.Compared with the actual production,this study explained the production status of the area and veri-fied the feasibility of the methods well.%NNW 油田油藏主要受沉积微相控制，合理的划分微相类型及给定微相边界值是该区沉积微相研究的关键。在分析传统沉积微相研究方法基础之上，利用优势相分析及离散图方法来划分微相类型及确定微相边界，结果认为长3储层可以划分为分流河道与河道间两种沉积微相，0.5作为长31、长32与长33三个沉积单元的沉积微相边界值较为合理，最后编制了研究区沉积微相平面图。与实际生产对比，微相划分结果较好地印证了研究区生产状况，也验证了研究方法的可行性。