Journal
FUEL
Volume 294, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2021.120500
Keywords
Shale formations; Korogen-Go2interaction; Counter-current division; Enhansteed shelean gas recovery; CO2 acqueration; Molecular dynamics simulation
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Funding
- Natural Science Foundation of China [42090024, 51774310]
- National Science and Technology Major Project [2016ZX05023-001, 2017ZX05049-004, 2016ZX05006-001]
- Fundamental Research Funds for the Central Universities [20CX06016A]
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This study investigated the CO2-kerogen interaction using molecular dynamics simulation, revealing that the strong affinity of CO2 to kerogen leads to efficient hydrocarbon extraction and CO2 storage in kerogen. Analysis of pressure, temperature, hydrocarbon composition, and kerogen type provided insights into enhancing hydrocarbon recovery and CO2 sequestration in shale formations. Field application methods were proposed for evaluating the enhanced recovery and storage capacity of shale formations.
The affinity of CO2 to kerogen represents an opportunity to increase shale oil/gas recovery using CO2, and as well represents great potential for CO2 sequestration in shale formations. In this study, the CO2-kerogen interaction dominated counter-current diffusion was investigated using molecular dynamics simulation. Molecular models of ad-/absorbed hydrocarbons extraction from kerogen using CO2 were constructed, and the CO2-hydrocarbon counter-current displacement processes were simulated. Results showed that the stronger interaction between kerogen and CO2 than that between kerogen and hydrocarbons results in a spontaneous counter-current diffusion process. That is, the ad-/absorbed hydrocarbons in kerogen can effectively be extracted out and CO2 can flow into and be stored in kerogen simultaneously. Effects of pressure, temperature, hydrocarbon, and the type of kerogen on the efficiency of hydrocarbon extraction, and CO2 storage capacity were analyzed. Further, in field applications, methods of evaluating the enhanced hydrocarbon recovery and the CO2 storage capacity of shale formations were proposed. Results obtained from this study provide guidance for enhancing shale oil/gas recovery using CO2 and for CO2 sequestration in shale formations.
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