模糊综合评判法在水驱开发效果评价中的应用

注水油藏水驱开发效果评价是提高有效注水、分析油藏开发开采水平和提出下步合理调整措施的重要依据。传统的评价方法大多是基于行业标准和矿场实际情况对某些影响水驱开发效果的生产指标进行分析来评价油藏开发效果,这种方法对不同流体性质、不同储层物性、不同开发阶段油藏水驱开发规律的差异性和整理评价性体现不够。本文在充分考虑油藏地质特征和开发动态的基础上,参考行业标准,结合机理模型数值模拟方法,筛选影响厚层砂岩油藏注水开发效果的12种重要参数,构成水驱开发效果指标评价体系,引入模糊综合评判法,建立厚层砂岩油藏水驱效果评价方法。评价指标的权重计算应用层次分析法,评判矩阵中单因素评价向量的确定采用因素评判矩阵法。利用此评价方法对B油田注水开发效果进行评价,结果认为该油田目前水驱效果较差,与油田实际开发动态相符,注水有待进一步加强和细化。文中所用评价方法简单、实用,可以为油藏今后的开发调整提供依据。

Application of fuzzy comprehensive evaluation method in assessment of water flooding effect

The evaluation of development effect of water flooding reservoir is an essential prerequisite to analyze level of development, enhance effective water injection and come up with reasonable and practical adjustment measures for the next stage. Traditional evaluation method is generally to analyze the effects of some development indicators on development according to certain standard in the industry, which has not thoroughly investigated the differences of the law of development between reservoirs of different fluids and different attributes and at different development stages.On the basis of a thorough analysis of reservoir geologic features and development dynamics with reference to the standard in the industry, and in combination with numerical simulation method, twelve essential indicators were selected to establish a set of evaluation system. Then the evaluation method for water flooding effect in thick reservoirs was set up through introducing fuzzy comprehensive evaluation method, in which the analytic hierarchy process was used to calculate the weight factor of each indicator and the element evaluation matrix was used to determine single element evaluation vector.The evaluation result shows that the current water flooding effect of B oilfield fails to meet expectations thus the water injection work needs to be further strengthened and refined. The method established in this paper is simple and practical and can provide basis for future adjustment in B oilfield.