基于模糊评价的烃类气驱候选油藏优选方法

Preferred Method of Screening Candidate Reservoirs by Hydrocarbon Gas Injection Based on Fuzzy Evaluation

综合分析影响注烃气开发效果的各因素,结合大量国内外油藏成功注烃气开发实例,筛选出11个影响参数,构成候选油藏注烃气提高采收率适宜度的评价指标,并对建立各项评价指标划分等级。采用模糊统计法、层次分析法及专家评估修正法得到各个评价参数的综合权重,运用多层次模糊综合评价法给出候选油藏注烃气开发的潜力大小。通过对J油田3个候选油藏进行多层次模糊评价分析,对比数值模拟结果表明该方法能对油藏进行正确的注烃气适宜度评价,为类似筛选候选油藏开展注烃气提高采收率提供了依据。

Eleven parameters affecting oil reservoir development via hydrocarbon gas injection were identified by conducting comprehensive analysis on the factors affecting the development of oil reservoir via hydrocarbon gas injection while taking the successful hydrocarbon gas injection development examples both at home and abroad into consideration,and these eleven parameters constitute the index system for evaluating the suitability of increasing candidate reservoir recovery efficiency via hydrocarbon gas injection. The grades of evaluation indexes were established. The comprehensive weight values of the evaluation parameters can be obtained by fuzzy statistical method,analytic hierarchy process and expert evaluation method,and the potential size of candidate reservoir for the development via hydrocarbon gas injection can be determined by multi- level fuzzy comprehensive evaluation. Multi- level fuzzy evaluation method was used to analyze three candidate reservoirs in Oilfield J,and numerical modeling results were compared. According to the modeling results,this method can be used to evaluate the suitability of the development of oil reservoir via hydrocarbon gas injection properly,and can provide the basis for selecting similar method for increasing the recovery efficiency of candidate reservoir via hydrocarbon gas injection