水下复合河道内单一河道的精细识别方法

A novel method developed for precise identification of single channel in underwater compound channel

针对三角洲前缘水下复合河道砂体内局部储层注采效果不好的问题,利用岩心、密井网等资料,重新精细刻画葡北二断块水下复合河道砂体。垂向上,通过物性、泥质、钙质三种夹层标志,将水下复合河道细分至单一期次。平面上,提出定量参数与定性参数相结合计算综合系数的新方法,用以追踪、预测井间单一河道边界。应用实例证明,该方法可以提高水下复合河道砂体精细刻画的准确性和可操作性,在油田实际开发调整中取得良好的效果。

This paper is motivated by the need for eliminating a poor local injection-production effect in composite channel sand reservoir in the delta front underwater. The study involves a new fine description of underwater composite channel sand body in Pubei two blocks using core,dense well pattern and other data; vertically subdividing the underwater complex channel into a single phase using the physical,muddy,calcareous three kinds of interlayer mark; and developing a new planar method for calculating the comprehensive coefficient by combining quantitative parameters with qualitative parameters in a way that tracks and predicts the single channel boundary between wells. The application shows that the method enables an improved accuracy and maneuverability when applied to the fine description of underwater composite channel sand body,and provides better results in actual oilfield development and adjustment.