Maturation-induced modification of organic matter in shales: Implications for geological CO2 storage

Onwumelu, Chioma; Kolawole, Oladoyin; Nordeng, Stephan

doi:10.1016/j.jfueco.2021.100009

Cited by 8 publications

(10 citation statements)

References 11 publications

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“…13,58 Similarly, the wetting tendency of shales has been correlated to its application for geological CO 2 storage to be a function of shale-TOC, with a higher TOC suggesting an increased potential for CO 2 -wetting of shales which implies a reduced sealing efficiency and CO 2 containment risks in shales. 13,14,58 Thus, in the shales considered in this study, analysis of the results (Fig. 9D) suggests that injecting CO 2 into immature shales may reduce their TOC by 25% after attaining future maturity, which may yield an additional layer of sealing efficiency to mitigate CO 2 containment risks associated with current shale formations for considered long-term CO 2 sequestration and storage.…”

Section: Implications For Co 2 Utilization and Sequestration In Shalementioning

confidence: 85%

“…The complete description and procedure of the pyrolysis analysis are established in Espitalié et al 34 . and Onwumelu et al 14,17,35,59 . Approximately 60–80 mg of the subsurface shale samples were analyzed using the Stratum Reservoir's Source Rock Analyzer (SRA) at the University of North Dakota (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…The source rock analysis utilizes the pyrolysis process for determining the thermal and chemical decomposition of shale rock samples at elevated temperatures in an inert atmosphere (simulating the diagenetic process). The complete description and procedure of the pyrolysis analysis are established in Espitalié et al 34 and Onwumelu et al 14,17,35,59 Approximately 60-80 mg of the subsurface shale samples were analyzed using the Stratum Reservoir's Source Rock Analyzer (SRA) at the University of North Dakota (Fig. 1C).…”

Section: Induced Thermal Maturation Using Source Rock Analysismentioning

confidence: 99%

“…Carbon dioxide (CO 2 ) is injected into shale formations (mostly mature Shales) for CO 2 ‐enhanced oil recovery (CO 2 ‐EOR) 5–7 or for CO 2 storage 8–13 . Thermal maturation is a diagenetic process of heating a source rock, such as shale, thereby inducing temperature–time‐driven reactions leading to the conversion of sedimentary organic matter to oil and gas 14–17 …”

Section: Introductionmentioning

confidence: 99%

“…[8][9][10][11][12][13] Thermal maturation is a diagenetic process of heating a source rock, such as shale, thereby inducing temperature-time-driven reactions leading to the conversion of sedimentary organic matter to oil and gas. [14][15][16][17] A supercritical CO 2 (scCO 2 ) state exists above the critical point of temperature and pressure of 31.8°C and 7.38 MPa, respectively, where CO 2 behaves like a gas but with a density like a liquid. 8,18 There are three recognized geological formations for CO 2 storage (GCS): saline aquifers, depleted oil and gas fields, and coalbeds.…”

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confidence: 99%

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CO₂‐Induced alterations due to thermal maturation in shale: Implications for CO₂ utilization and storage

Onwumelu,

Kolawole,

Bouchakour

et al. 2023

Greenhouse Gases

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Shales have low to ultra‐low porosity and permeability, which makes them an attractive candidate for CO2 utilization during CO2‐enhanced oil recovery (CO2‐EOR) or for geologic CO2 storage (GCS). Shale are source rocks, and thus, there is a continuous induced diagenetic process that can alter their properties as they reaches maturity at greater in situ temperature. However, there are significant knowledge gaps in the possibility of CO2 utilization during this diagenetic process (thermal maturation) to achieve long‐term CO2 storage. This experimental study investigates the potential for CO2 utilization in shale due to induced thermal maturation at in situ conditions, and the implications of pre‐maturation CO2 injection in shale for GCS and CO2‐EOR. Here, we used subsurface hydrocarbon‐rich Bakken and Green River shales exposed to CO2 for a specific period. This is followed by inducing the unexposed and CO2‐exposed shales to thermal maturity. Subsequently, we evaluated the total organic carbon (TOC), liberated hydrocarbons (S2), and the mineralogical and mechanical properties of the mature and CO2‐exposed mature shales. We further assessed the implications of CO2 utilization and storage in thermally matured Bakken and Green River shales for long‐term storage or CO2‐EOR. The results indicate that if CO2 is injected into shales before attaining maturity, higher hydrocarbon production and more significant mechanical weakness can be expected when they attain maturity in Bakken shales (+30% liberated hydrocarbons; −31% Young's modulus; −34% hardness) and Green Rivers shales (+8% liberated hydrocarbons; −40% Young's modulus; −30% hardness), and this is relative to Bakken and Green River shales without CO2 injection before attaining thermal maturity. Further, CO2‐exposed mature Bakken and Green River shales can alter the minerals in shales with the dissolution of dolomite and precipitation of calcite, which promotes mineral trapping and achieve a lower TOC (Bakken shale = −24%; Green River shale = −26%), and this is relative to Bakken and Green River shales without CO2 injection before attaining maturity. Analyses of the results suggest that the application of this proposed CO2 injection and utilization in immature shales could access more excellent CO2‐storage reservoirs in Bakken and Green River shales without waiting for a more extended period for the shales to become viable and mature, which is the case with the present GCS and CO2‐EOR operations in shale reservoirs globally. Also, our proposed pre‐maturation CO2 injection could rejuvenate mature shales for increased hydrocarbon production through CO2‐EOR, yield a greater sealing efficiency, and mitigate leakage risks for long‐term CO2 storage. The results from this study provide novel insights that can advance CO2 utilization for future GCS and/or CO2‐EOR in immature Bakken and Green River shales while at the same time providing an immediate and viable option for storage by depleting atmospheric CO2 to meet the global net‐zero by 2050. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Implications For Co 2 Utilization and Sequestration In Shalementioning

confidence: 85%

Section: Methodsmentioning

confidence: 99%

Section: Induced Thermal Maturation Using Source Rock Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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CO₂‐Induced alterations due to thermal maturation in shale: Implications for CO₂ utilization and storage

Onwumelu,

Kolawole,

Bouchakour

et al. 2023

Greenhouse Gases

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Emerging advances in CO₂ storativity and trappability within shale reservoirs

Hameli,

Belhaj,

AlDhuhoori

et al. 2024

Energy Science & Engineering

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Geological carbon storage and utilization is widely regarded as the most realistic method of reducing carbon emissions throughout the energy transition era. In recent times, the implementation of carbon dioxide (CO2) injection has emerged as a potential method for increasing the recovery of hydrocarbon and facilitating the interaction of CO2 in shale reservoirs. This methodology enables the mitigation of total carbon emissions released into the earth's atmosphere. The concept of using CO2 geological sequestration in unconventional shale formations seems to be a prudent approach in responding to both the growing energy demand and mandating environmental requirements simultaneously. Shale reservoirs have received significant interest in the global context because to their substantial reserves and widespread distribution. This research offers a comprehensive analysis of the essential components involved in the sequestration of CO2 in shales, therefore improving the trapping and long‐term storage of CO2. In addition, it explores the extraction of hydrocarbons in this context. Gaining a comprehensive understanding of the fundamental factors that contribute to the storativity and trappability of CO2 is crucial for improving the displacement of methane gas (CH4) during shale gas recovery. This is particularly relevant in depleted the reservoirs of shale gas, where the aim is to enhance the effectiveness of in situ CO2 sequestration while reducing the leakage risk.

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An integrated multi-scale model for CO2 transport and storage in shale reservoirs

et al. 2023

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Maturation-induced modification of organic matter in shales: Implications for geological CO2 storage

Cited by 8 publications

References 11 publications

CO₂‐Induced alterations due to thermal maturation in shale: Implications for CO₂ utilization and storage

CO₂‐Induced alterations due to thermal maturation in shale: Implications for CO₂ utilization and storage

Emerging advances in CO₂ storativity and trappability within shale reservoirs

An integrated multi-scale model for CO2 transport and storage in shale reservoirs

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Maturation-induced modification of organic matter in shales: Implications for geological CO2 storage

Cited by 8 publications

References 11 publications

CO2‐Induced alterations due to thermal maturation in shale: Implications for CO2 utilization and storage

CO2‐Induced alterations due to thermal maturation in shale: Implications for CO2 utilization and storage

Emerging advances in CO2 storativity and trappability within shale reservoirs

An integrated multi-scale model for CO2 transport and storage in shale reservoirs

Contact Info

Product

Resources

About

CO₂‐Induced alterations due to thermal maturation in shale: Implications for CO₂ utilization and storage

CO₂‐Induced alterations due to thermal maturation in shale: Implications for CO₂ utilization and storage

Emerging advances in CO₂ storativity and trappability within shale reservoirs