SBM-DEA模型在储层综合定量评价中的应用

Application of SBM-DEA model in comprehensive quantitative evaluation of reservoir

针对传统储层评价方法中人为主观性较强、计算过程复杂、结果分析不充分等问题,根据数据包络分析原理,探讨SBM-DEA模型在储层综合定量评价中的应用。实践表明,该模型在储层评价中具有以下优点:①能同时考虑多个正相关和负相关指标,无需事先给定评价标准及指标权重值,避免主观因素影响,具有较强客观性;②以线性规划为工具,无需进行指标无量纲化等数据预处理,有效简化评价过程;③评价结果介于0~1之间,除对评价单元进行排序、分类外,还可以提供评价非有效的原因及可改进信息。将其应用到苏里格气田苏X井区盒8下亚段低渗透气藏早期储层分类评价和刻画中,将研究区储层分为4类,其中Ⅰ,Ⅱ类为有利储层,总体评价结果与传统模糊综合评价结果具有较好对应关系,与气田生产实际及地质认识也基本吻合,并给出了评价实例非有效的主要差距及改进措施,表明该方法在实际应用中具有可信度及可行性,为实现类似高效、客观的储层评价提供了新的思路。

Aiming at the problems of strong subjectivity,complicated calculation procedures and inadequate analysis in traditional reservoir evaluation,the application of the Slack Based Measure model of Data Envelopment Analysis(SBM-DEA model)in comprehensive quantitative evaluation of reservoir was discussed.It is shown that this model has the following advantages:①It could take into account of both the positive and negative related indicators,and is more objective that there is no need to determine the evaluation criterion and index weights by subjective analysis in advance;②Taking the linear programming as the tool,it could simplify the calculation procedure that it does not have to standardize the evaluation indexes;③The evaluation result is between 0-1 naturally,and it can be not only used for sorting and classification of evaluation units,but also providing the reason that units are not efficient as well as the suggestion on how to improve them.The new method was applied in early low-permeability gas reservoir evaluation on the lower section of the eighth member of Shihezi Formation(Middle Permain)in SuX region of Sulige gasfield.Four types of reservoir are classified in the study area and the type I and II would be the favorable targets.The new evaluation results obtained generally accorded with the traditional fuzzy comprehensive reservoir evaluation results,and showed good consistence with practical field production and geological knowledge.At the same time,the main advice on insufficiency and improvements for this case was given.It is proved that this evaluation method is reliable and practical in application,and provides new thought for similarly effective and objective reservoir evaluation as well.