灰色关联分析在辽河滩海地区储层油气产能评价中的应用

The application of grey relating analysis in prediction for reservoir production capacity in the Tanhai Area, Liaohe oil-field

西安石油学院,西安710065

Xi'an Petroleum College, Xi'an 710065

油气储层的产能影响因素可分为人为因素和储层因素两类。一个油区,在各种作业方式等人为因素大致相同的前提条件下,储层产能主要取决于储层自身的性质。我们从达西二维产量公式出发,研究储层产能的理论方程,以相对渗透率与含水饱和度的函数关系为纽带,导出油气储层产能与储层有效孔隙度、渗透率以及电阻率之间的多元关系式。在此基础上,结合测井学的基本理论,将其作为储层产能综合评价的参数,采用灰色关联分析法建立了储层产能预测系统。该方法不仅可以综合定量地评价储层产能的分类,还可以通过关联度给出评价结果的可靠程度。

The factors that influence the oil and gas production capacity include artificial factors and reservoir factors. For a specific oil zone, the production capacity of a reservoir is determined by the self features of the reservoir if the artificial factors, such as various treatment manners, are the same. In this paper, the theoretical equation of a reservoir's production capacity was studied from Darcy's two dimensional production equation. The complicated relation between production capacity and effective porosity, permeability, and resistivity is established, through the functional relationship between relative permeability and water saturation. Based on the above work and basic logging theory, we finally established the methodology of reservoirs production capacity via grey relating analysis. This method can not only quantitatively evaluates the classification of reservoir's production capacity, but also gives the reliability of evaluation results by relation degree. The method has been successfully used for the oil gas production capacity prediction for the third segment, Dongying Formation, of Hainan structural belt, Tanhai area, Liaohe Oil field.