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三间房组油藏储层辫状河三角州平原和前缘亚相比较发育。其主要微相由辫状河分流河道、心滩、水下分流河道、分流间区等组成。受沉积微相控制，储层砂体在平面上的分布特征导致和影响了注水开发中的油水运动和产量变化。由于河道砂体物性好、连通性好、吸水强度大，且具有明显的方向性，故注入水沿河道砂体发育方向推进速度快，油井含水上升也快，从而造成沿主河道砂体方向上的高产井初期不含水，后期高含水的现状。剖面上受沉积旋回控制，动用程度较高的层段主要集中在每一砂层组中下部的第３ 、４ 小层。
The Sanfangfang reservoir reservoir developed along the braided river delta plain and frontier subfacies. The main microfacies are composed of braided river distributary channel, heart beach, underwater distributary channel and shunt area. Under the control of sedimentary microfacies, the distribution characteristics of reservoir sand in the plane lead to and affect the oil-water movement and the change of output in waterflood development. Because of good physical properties, good connectivity, high water absorption strength and obvious directivity, riverbed sand body has the advantages of fast propulsion in the direction of sand body development and rapid rising of water content in the well, resulting in a large amount of water along the main channel sand body High-yield wells on the initial non-water, the status of high water-cut later. Sedimentary cycles controlled by sedimentary cycles in the section are mainly concentrated in layers 3 and 4 of the lower part of each sand group.