灰色关联分析法在双河油田储层评价中的应用

摘要

The fine reservoir evaluation is important to oil and gas field exploration, in which, the most important is to determine weight coefficient of every evaluation parameter. Taking formation H3Ⅲ-1 for example, rationale of grey system theory was intro⁃duced. Six evaluation indexes related to the reservoir such as porosity, permeability, sandstone thickness, ratio of sand body, shale content and variation coefficient were selected. By gray correlative analysis method, weight coefficient of every index was obtained and comprehensive evaluation factors of every reservoir unit were acquired. On this basis, inflection point method was applied to de⁃termine classification thresholds of reservoir evaluation. Accordingly, comprehensive quantitative assessment was conducted in for⁃mation H3Ⅲ-1 of block 438 in Shuanghe oilfield. The research results show that, by this method, the contradictory results of evalu⁃ating reservoir by using single factor can be avoided. The calculation is simple and needs fewer data. Its result is in accordance with real production data. The method can effectively explain differential problems occurred in reservoir productivity under the same advantage and it is worth promoting in reservoir evaluation and classification.%对储层进行精细评价对油气田勘探开发意义重大，其中最重要的是确定各个评价参数的权重系数。以双河油田438块核三段Ⅲ油组1小层为例，介绍了灰色系统理论的基本原理，并选取与储层相关的孔隙度、渗透率、砂厚、砂地比、泥质含量及变异系数等6个评价指标，通过灰色关联分析法求得各个指标的权系数，得出研究区各个储层单元的综合评价因子。在此基础上，用拐点法确定储层评价的分类阀值，从而对双河油田438块核三段Ⅲ油组1小层储层进行综合定量评价。研究结果表明：该方法能有效避免使用单因素评价储层出现的结果相互矛盾的问题，计算简单，所需数据量小，与油田实际生产数据一致，并且能有效解释同一优势相下储层产能存在差异性的问题，是一种值得推广的储层评价与分类方法。