Petroleum Exploration and Development >

2021 , Vol. 48 >Issue 6: 1420 - 1429

DOI: https://doi.org/10.1016/S1876-3804(21)60298-7

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

  • Jilin FAN ,
  • Feng ZHANG ,
  • Lili TIAN ,
  • Qixuan LIANG ,
  • Xiaoyang ZHANG ,
  • Qunwei FANG ,
  • Baoping LU ,
  • Xianghui LI
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  • 1. School of Geosciences, China University of Petroleum, Qingdao 266580, China
    2. Shandong Provincial Key Laboratory of Deep Oil and Gas, Qingdao 266580, China
    3. CNPC Well Logging Technology Research Center, Xi’an 710000, China
    4. Isotope Research Institute of Henan Academy of Sciences Co., Ltd., Zhengzhou 450000, China

Received date: 2021-01-25

  Revised date: 2021-09-23

  Online published: 2021-12-29

Supported by

National Natural Science Foundation of China(41974127);National Natural Science Foundation of China(41974155);China University of Petroleum (East China) Graduate Student Innovation Project Funding Project(YCX2020008)

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Abstract

A method is proposed to characterize the fast neutron scattering cross-section (σf) quantitatively by the combination of inelastic gamma rays and captured gamma rays, so as to realize the gas saturation evaluation of CO2-injected heavy oil reservoirs based on the three-detector pulsed neutron logging technology. Factors influencing of the evaluation effect of this method are analyzed and the effectiveness of this method is verified by a simulation example. By using the Monte Carlo simulation method and the physical model of bulk-volume rock, the relationship between σf and CO2 saturation is studied, and the saturation interpretation model is established. The influences of formation temperature and pressure, heavy oil density, borehole fluid and reservoir methane content on the evaluation results of CO2 saturation are analyzed. The results show that the characterization of σf by the combination of secondary gamma information can eliminate the influence of formation lithology, borehole fluid and methane content are the main factors affecting the quantitative monitoring of CO2 saturation, and the effects of formation temperature and pressure and heavy oil density are negligible. The simulation example verified the feasibility of the method for evaluating the CO2 saturation of CO2-injected heavy oil reservoirs.

Key words： CO2 flooding; gas saturation; heavy oil reservoir; pulsed neutron logging; fast neutron scattering cross-section; secondary gamma-ray; Monte Carlo simulation

Cite this article

Jilin FAN , Feng ZHANG , Lili TIAN , Qixuan LIANG , Xiaoyang ZHANG , Qunwei FANG , Baoping LU , Xianghui LI . A method of monitoring gas saturation in carbon dioxide injection heavy oil reservoirs by pulsed neutron logging technology[J]. Petroleum Exploration and Development, 2021 , 48(6) : 1420 -1429 . DOI: 10.1016/S1876-3804(21)60298-7

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