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 4 Basic parameters of each reservoir in the example.

Reservoir Matrix Porosity/% Density/(g·cm-3) Shale content/% Pore fluid composition A Sandstone 30 2.114 0 14 With CO2 saturation of 20%, water saturation of 30%, and oil saturation of 50% B Sandstone 20 2.484 0 0 With CO2 saturation of 70%, water saturation of 10%, and oil saturation of 20% respectively C Sandstone 35 1.941 5 15 With CO2, water, oil and CH4 saturations of 50%, 5%, 25%, and 20% respectively D Limestone 25 2.182 5 0 With CO2 and oil saturations of 50% and 50% E Mudstone 30 2.046 6 71 With CO2 and oil saturations of 70% and 30% respectively F Sandstone 20 2.250 0 31 With CO2 and water saturations of 60% and 40% respectively