Fine dissection of meandering river sand bodies under dense well nets

Abstract

The main oil layer of Grape Flower in X Oilfield has entered the late stage of high-extra-high water cut, and the remaining oil distribution is uneven, so as to ensure the development effect of the purpose block. Based on the theory of fine sedimentology, the sedimentation characteristics of PІ11 and PІ212 deposition time units were studied. Combined with the sedimentary and logging data of the meandering river delta, the logging facies model was classified in detail and established. Eleven microfacies of 2 subfacies in the delta and the delta shunt plain were identified. PІ11 and PІ212 deposition microphase layout maps were drawn. According to the sedimentary microfacies and conventional flooded logging interpretation data, four flooding distribution histograms were plotted to obtain the residual oil distribution law. The research results provide theoretical support for the later development adjustment.

Keywords

• deposition time unit
• logging phase model
• sedimentary microfacies
• flooding characteristics
• residual oil distribution