差分进化算法在岩石孔隙结构研究中的应用  

Application of differential evolution in study of rock pore structure

作　　者：李鹏举[1,2] 徐若谷 蒋青 Li Pengju;Xu Ruogu;Jiang Qing(School of Earth Science,Northeast Petroleum University,Daqing 163318,China;Accumulation&Development of Unconventional Oil&Gas,State Key Laboratory Cultivation Base Jointly-Constructed by Heilongjiang Province&Ministry of Science&Technology,Northeast Petroleum University,Daqing 163318,China)

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318 [2]东北石油大学非常规油气成藏与开发省部共建国家重点实验室培育基地,黑龙江大庆163318

出　　处：《黑龙江科技大学学报》2023年第4期609-613,621,共6页Journal of Heilongjiang University of Science And Technology

摘　　要：应用岩心核磁共振横向弛豫时间谱研究岩心孔隙结构的核心在于横向弛豫时间与毛管压力的转换系数,传统方法在转换过程中需要用到一些岩石特性参数,实用难度较大。在确定了两者幂函数转换关系的基础上,建立了伪毛管压力曲线转换模型,采用差分进化算法反演得到最佳转换参数,通过文中方法得到的平均孔喉半径、分选系数、排替压力等孔隙结构参数与3块岩心数据进行对比,结果表明,该方法具有较高的准确性,计算的分选参数效果最好,相对误差在2%以内,其他参数相对误差最小的为0.2%,最大的也仅为37%。This paper is concerned with the insight that the core of using core nuclear magnetic resonance lateral relaxation time spectrum to study core pore structure lies in the conversion coefficient between lateral relaxation time and capillary pressure;and traditional methods require some rock characteristic parameters during the conversion process,which is difficult to apply.On the basis of determining power function conversion relationship,the study involves establishing a pseudo capillary pressure curve conversion model;using the differential evolution to inverse to obtain the best conversion parameters;and comparing the pore structure parameters of average pore throat radius,sorting coefficient,displacement pressur with the three cores' data by the proposed method.The results show that the proposed method has high accuracy,and the calculated sorting parameters shows the best effect within a relative error of 2%;and the minimum relative error of other parameters is 0.2%,and the maximum is only 37%.

关 键 词：核磁共振测井 伪毛管压力曲线 孔隙结构 差分进化算法 

分 类 号：P618[天文地球—矿床学]