曙22块杜家台油层沉积特征

Sedimentary Features of Dujiatai Reservoir of Shu 22 Blocks

搞清砂体的沉积环境及其沉积特征是正确认识其非均质特征、估计其开发效果以及进一步加密调整的基础和关键．曙２２块杜家台油层是在复杂的古构造及古地形基础上发育起来的一套扇三角洲沉积，处于区域相模式的控制下．在对岩心观察描述的基础上，应用电性组合，结合砂体发育程度及其平面、空间的分布状况，对杜Ⅱ８～Ⅱ１１层及杜Ⅲ３～Ⅲ５层进行了沉积微相研究．确认研究区两主力油层分别为扇三角洲前缘亚相及前扇三角洲亚相，扇三角洲前缘亚相又进一步细分为分流河道微相、分流河道间微相、河口砂坝微相、前缘薄层砂微相，各微相发育于不同的小层中，具有各自的沉积特征．

To gain a clear idea of the sedimentary environment and its sedimentary feature of a sand body is the basis and key to understanding the heterogeneity, evaluating the exploitation effect and making further adjustment. Dujiatai reservoir of Shu 22 blocks is a set of fan delta sediment which developed on the base of complex paleostructure and paleotopography. It is necessary to dissect the DuⅡ 8～Ⅱ 11 and DuⅢ 3～Ⅲ 5 layer of the research area and make further study about its sedimentary microfacies by applying electrical assemblage, combining the development extent of the sand body with the condition of its plane and space distribution. The two major reservoirs of the research area are both the frontal subfacies of fan delta and the subfacies of frontal fan delta. And the frontal subfacies of fan delta can also be subdivided into distributary microfacies, interdistributary microfacies channel mouth bar microfacies and frontal thin bedded sand microfacies. Each microfacies developed from different small layers, and each microfacies has its own sedimentary features.