大庆油田北三区西部井网加密的实践和认识

试验区PI 1-4油层属河流-三角洲相沉积，水淹严重且极不均匀，各沉积单元水淹状况与单元的油层发育、注采完善状况紧密相连。砂体发育决定了水淹厚度具有南北条带的一致性，并且西部水淹程度比东部高，油层纵向上呈多段水淹，高中水淹部位大部分集中在各沉积单元的底部。指出试验区内有6种剩余油分布，并总结出了井网加密后对水驱的认识，为进行三元复合驱试验奠定了基础。

Practice and Understanding of the Infilling Patterns in the Western Part of Third Block in Northern Area in Daqing Oilfield

This paper summarizes the understanding of the infilling pattern of Beisanxi ASP flooding test area. The PI1-4 layer of the test area is the fluvial-delta deposition and the water-flooded situation is severe and non-uniform. The water-flooded situation of each sedimentary unit is relevant. To the development of the layer and the system of injection-production, the development of the sandbody determines the consistency of south-north belt in waterflooded thickness, the waterflooded extent of the western part is higher than that of the east part. The layers are multi-segment waterflooded vertically and the part that is waterflooded seriously is mainly centralized in the bottom of each sedimentary unit. There are six kinds of residual oil in the test area: the residual oil retained at the peak of the channel,the residual oil at the matching belt of the channel, the residual oil dispersed locally at the channel, the residual oil sheltered from the abandoned channel, the residual oil at the crevasse channel, the residual oil at the thin inter-channel sands. The understanding of the waterflooding is also concluded after drilling the infill wells. This study lays a foundation for the ASP flooding.