碳酸盐岩储层孔隙度超声波评价数值模拟  

Carbonate reservoir porosity ultrasonic evaluation by numerical simulation

作　　者：王森[1] 刘向君 陈乔[3] 梁利喜 周龙涛 

机构地区：[1]中国科学院重庆绿色智能技术研究院,重庆400714 [2]油气藏地质及开发国家重点实验室,成都610500 [3]中国科学院水库水环境重点实验室,重庆400714

出　　处：《地球物理学进展》2015年第1期267-273,共7页Progress in Geophysics

基　　金：中国石油科技创新基金(2009D-5006-03-02);重庆市基础与前沿研究计划项目(cstc2014jcyjA90008);重庆市国土资源和房屋管理局科技计划项目(CQGT-KJ-2014017)联合资助

摘　　要：孔隙度是地质勘探、储层评价及产能预测的重要基础参数.本文利用理想岩心和对实际岩样图像进行数字图像处理建立数字岩心,在此基础上进行二雏超声波数值模拟计算,开展孔洞型储层孔隙度预测研究.研究表明:wyllie平均时间公式在孔洞型地层中并非完全不适用,其适用性由孔洞尺寸及孔洞密度共同控制;当孔密度为0.08~0.064(个/mm^2)时实测孔隙度-波速关系背离wyllie理论计算值,当孔密度大于0.096(个/mm^2)时实测孔隙度-波速的关系趋近wyllie计算值;定孔隙度时,孔隙密度-品质因数呈Q^(-1)=aln(ρ)+b对数规律变化;定孔隙密度时,孔隙度-品质因数呈φ=aQ^(-1)+b线性规律变化,预测模型的系数直接受到孔隙密度的影响,孔隙密度越大则b值越大.Porosity is basic parameter for reservoir evaluation and production capacity forecast.In this paper,the ideal core and digital image processing of the actual rock sample image is the establishment of digital core.Calculated on the basis of the numerical simulation of two-dimensional acoustic.To carry out the the vug reservoir porosity prediction research.Studies have shown that：wyllie average time formula is not completely unsuitable in vug carbonate formation.Jointly controlled by the pore size and pore density.When the hole density of 0.08-0.064 measured porosity-wave velocity relationship to deviate from wyllie theory calculated.The actual porosity-wave velocity of the relationship the approach wyllie calculated when the hole density greater than 0.096.Given porosity,pore density-the quality factor was Q-^1=aln（ρ）＋b logarithmic law changes.Given porosity,porosity-the quality factor was φ=aQ^-1 ＋ b logarithmic law changes.The coefficients of the prediction model are directly affected by the influence of the pore density,the greater pore density the greater the b value.

关 键 词：时间平均公式 孔隙度 品质因数 孔洞密度 

分 类 号：P631[天文地球—地质矿产勘探]