基于砂体叠合与层间参数差异的层系评价方法研究

油田开发后期,受储层非均质、油水黏度差、井网井距等因素影响,层系内小层间矛盾逐步加剧,开发效果变差,而进一步开展开发层系的细分重组,是解决层间矛盾、提高采收率的主要技术手段之一.为解决现有层系评价技术模糊不具体、层系调整时机把握困难的问题,该文利用模糊数学的最大隶属度理论方法,选择界限含油面积覆盖率、界限含油砂体叠合率...

Research on Stratification Evaluation Method Based on Sandbody Superimposition and Difference in Interlayer Parameters

At the late stage of oilfield development, due to the influence of reservoir heterogeneity, poor oil-water viscosity, well pattern and spacing, etc., the contradictions of small layers within strata gradually intensifies, and the effect of development becomes worse. Therefore, further subdivision and reorganization of developed strata is one of the main technical means to solve the contradiction between layers and enhance oil recovery. In order to solve problems that the evaluation technology of existing strata is fuzzy and unspecific and the timing of adjustment is difficult to grasp, the theory method of maximum membership degree in fuzzy mathematics is used in this paper. The inter-layer variation coefficients of boundary oil-bearing area coverage rate, boundary oil-bearing sand body superposition rate, oil-bearing rate, saturation, seepage resistance and other indicators are selected as the evaluation of strata. By evaluating and recognizing the present situation of strata from a quantitative and hierarchical perspective, the evaluation of the development status within strata and the timing of the adjustment within strata are quantitatively evaluated, which is very important guiding significance for understanding the current stage of the oilfield strata and further enhancing oil recovery through the adjustment within strata.