Research On The Characteristics Of Sedimentary Micro-facies In Heidimiao Oil Reservoir Of Daqingzi Area

To study reservoirs, sedimentary facies study is indispensable, while in different stages,the research degrees of sedimentary facies are distinguishing. For example, in the explorationstage, we just need to study facies and subfacies, but by the development stage, we need tosubtly describe sedimentary microfacies in the study area. Sedimentary microfacies are themost basic building blocks in the sedimentary system, which is also the basis of single welland multi-wells reservoir evaluation. Sedimentary microfacies control the macroscopicdistribution of reservoir sand body and seepage barrier, and it is of great significance foroilfield development, at the same time.The study area, Heidimiao oil reservoir in Daqingzijing area, is at the early stages ofexploration and development, which need us to study further about division and contrast of oillayers, sedimentary microfacies and distribution of sedimentary microfacies. Filtrate wells inthe study area, choose the exploratory wells and appraisal wells that contain all layers, goodborehole log, reasonable boundaries, and strong separability, as stratification standard well, inorder to achieve stratigraphic classification and correlation of the study area, and adjust theK1n3and K1n4layers of study area dividually.Using "cycle contrast, hierarchical control"contrast method,8sand groups of1922wells in the study area has carried on the detailedcomparison. On the basis of this, the sedimentary microfacies of Ⅵ sand formation of K1n4layer in main layer were studied. By observing the11coring wells within the scope of thestudy area,combining with the sedimentary background of the research region, and then get ageneral understanding on sedimentary subfacies and microfacies types in this area.Combining the principle of log facies, the same sedimentary microfacies characteristic of thetypical logging curve has carried on the induction and summary, and a variety of loggingmicrofacies model of sedimentary microfacies has been completed. On this basis, loggingmicrofacies of272exploration evaluation wells on each sand group in the study area areidentified, which combine microfacies of the sand group in the plane. The sedimentarymicrofacies figures and sedimentary model of Ⅵ sand group in K1n4layer are compiled andanalyzed, and the control of the oil and gas accumulation by sedimentary facies is studied,which guides and provides the beneficial reference about the encryption scheme adjustment,well placement and development in this area.