核磁共振测井对致密砂岩储层进行有效性表征及分级预测  

Using Nuclear Magnetic Resonance(NMR)Logging to Characterize Tight Sandstone Reservoirs Validity and Predict Formation Types

作　　者：张子为[1] 赵雅庆 黄文科[1] 薛媛竹 潘晓丽[1] 邓宝康 于江[1] ZHANG Ziwei;ZHAO Yaqing;HUANG Wenke;XUE Yuanzhu;PAN Xiaoli;DENG Baokang;YU Jiang(The first gas production plant,Petro China Changqing Oilfield Company,Jingbian 718500,China;Sichuan OGT Technology Development of Oilfield Co.Ltd.,Chengdu 610041,China)

机构地区：[1]中国石油长庆油田分公司第一采气厂,靖边718500 [2]四川奥吉特油田科技开发有限公司,成都610059

出　　处：《核电子学与探测技术》2024年第3期573-579,共7页Nuclear Electronics & Detection Technology

基　　金：国家科技重大专项资助项目(No.2011ZX05044)。

摘　　要：以鄂尔多斯盆地安塞地区三叠系致密砂岩油层为例,利用两个截止值将岩石孔隙空间划分为小尺寸孔隙、中等尺寸孔隙和大尺寸孔隙3部分,分别计算了小尺寸中等尺寸和大尺寸孔隙占整个岩石孔隙尺寸的百分比。结合核磁孔隙度、核磁共振T_(2)几何均值,构建了反映致密砂岩储层孔隙结构差异的有效性指数,利用其直观定量表征目标储层的有效性。分析了储层有效性指数与米采液指数之间的对应关系,利用其将目标储层划分为3类。Taking the Triassic Chang 8 Member of Ansai Region,Ordos Basin as an example,two T_(2)cutoff were chosen to classify the T_(2)spectra into three parts,which are defined as the pores with small pore size,median pore size and large pore size,separately.The percentage compositions of small pore size,median pore size and large pore size were calculated.Combining with NMR total porosityT_(2)geometric mean(T2lm)and the percentage compositions of small pore size,median pore size and large pore size,a parameter,which is named as formation effective index(NVI)and used to reflect tight sandstone reservoir pore structure,is established,and it is used to quantify formation validity.Relationship between NVI and oil displacement index is analyzed,and the target tight sandstone reservoirs are categorized into three types.

关 键 词：核磁共振测井 储层有效性 分级预测 致密砂岩 

分 类 号：P613.813[天文地球—矿床学]