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鄂尔多斯盆地环县地区延长组长8段为典型的低孔隙度低渗透率致密砂岩储层.由于其孔隙结构复杂、非均质性较强,因而对其渗透率的分析预测是该区储层研究的难点,结合环县地区长8储层的具体地质特征和测井曲线类型,利用遗传算法全局寻优的特点,建立了适合本地区致密砂岩储层渗透率计算的公式.研究表明,使用公式预测的渗透率与利用岩心分析的渗透率结果有较高的符合率.因此,遗传算法在致密砂岩储层渗透率计算公式的研究中具有很好的应用前景.
Because of its complex pore structure and strong heterogeneity, the 8th member of Yanchang Formation in Huanxian area, Ordos Basin, is a typical tight sandstone reservoir with low porosity and permeability. Therefore, the permeability of this reservoir is predicted to be the reservoir According to the geological characteristics of Chang 8 reservoir and the type of well logging curve in Huanxian area, the formula of permeability calculation of tight sandstone reservoir in this area is established by using the characteristics of global optimization of genetic algorithm.Research shows that, The permeability predicted by the formula has a high coincidence rate with the result of permeability analysis using core analysis, therefore, the genetic algorithm has a good application prospect in the study of permeability formula of tight sandstone reservoir.