A method of monitoring gas saturation in carbon dioxide injection heavy oil reservoirs by pulsed neutron logging technology

FAN Jilin,ZHANG Feng,TIAN Lili,LIANG Qixuan,ZHANG Xiaoyang,FANG Qunwei,LU Baoping,LI Xianghui

Table 1 The σf values of different media with certain densities.

Medium Density/ (g∙cm-3) σf/m-1 Medium Density/ (g∙cm-3) σf/m-1 Quartz 2.65 9.64 Water 1.00 14.00 Calcite 2.71 11.09 CO2 0.50 2.53 Dolomite 2.87 11.82 CH4 0.20 5.35 Chlorite 2.76 8.64 Heavy oil 0.95 13.50