Analysis of Oil-Water Distribution Law and Main Controlling Factors of Meandering River Facies Reservoir Based on the Single Sand Body: A Case Study from the Yan 932 Layer of Y Oil Area in Dingbian, Ordos Basin

Abstract

After the oilfield development enters the medium and high water cut stage, the fine three-dimensional description of the single sand body, the distribution rules of the remaining oil, and its main controlling factors have become the focus of research. The premise is to understand the original oil and water distribution characteristics and the important influencing factors of the reservoir. Taking the Yan 932 reservoir of Y oil area in Dingbian as an example, combined with the meandering river sedimentary model, this paper uses dense well pattern logging data to dissect single sand body on the foundation of the core and logging results. The conclusion shows that, first, Yan 932 layer is divided into two stages: Yan 932-1 and Yan 932-2, which constitute four single sand body superposition configuration modes, namely, type I, type II, type I & II, and type I/II. Second, type I & II is mainly developed in the sand body of the main channel. In the west of the main channel sand body, type I, type II, and type I/II are developed. Only type II is developed in the east of the main channel sand body. Thirdly, sedimentary microfacies, sand body thickness, sand body configuration, and structural characteristics are the key factors influencing the oil-water distribution law of the Yan 932 reservoir.

A New Methodology for Determination of Layered Injection Allocation in Highly Deviated Wells Drilled in Low-Permeability Reservoirs

“…The flow unit is based on the reservoir lithology, physical properties, sedimentation, pore throat, and fluid characteristics to divide the reservoir into different seepage units, mainly reflecting seepage characteristics. Although sand body configuration identification [45][46][47] and flow unit division [48,49] have been studied by predecessors, how to combine the two methods to correct sand body connectivity has not been reported. After the combination of the two methods, boundary identification of single sand bodies is carried out, which corrects the deficiency of a single sand body identification with the sand body configuration and realizes an accurate evaluation of connectivity between sand bodies.…”