Influence of anisotropic and heterogeneous permeability coupled with in-situ stress on CO2 sequestration with simultaneous enhanced gas recovery in shale: Quantitative modeling and case study

Liu, Jun; Xie, Lingzhi; He, Bo; Gan, Quan; Zhao, Peng

doi:10.1016/j.ijggc.2020.103208

Cited by 44 publications

(26 citation statements)

References 49 publications

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“…The higher the tectonic activity intensity is, the more severe the denudation. The longer the influence time is, the more serious the damage to the preservation conditions (Gambelli, Castellani, Nicolini, & Rossi, 2019; Liu et al, 2015, 2018; Liu, Xie, He, Gan, & Zhao, 2021; Naeher et al, 2019). The south‐eastern Sichuan Basin experienced rapid uplift at the end of the Cretaceous.…”

Section: Discussionmentioning

confidence: 99%

A new type of unconventional gas reservoir from the nodular limestones of the Middle Permian Maokou Formation in the south‐eastern Sichuan Basin, south‐west China

Shan

Luo

et al. 2021

Geological Journal

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A set of nodular limestones was developed in the first member of the Middle Permian Maokou Formation (denoted as the Mao‐1 member) in the south‐eastern Sichuan Basin, south‐west China. Borehole coring has shown excellent signals of oil and gas from the Mao‐1 member carbonates, and many drilling wells have obtained industrial‐level gas flow. To assess the natural gas exploration potential of the Mao‐1 member in this area, sedimentary characteristics of drilling cores are described, and the formation mechanism of natural gas reservoir and its key controlling factors are also evaluated using data obtained from field geological survey, core observation, and laboratory experimental analysis. On this basis, the process of natural gas accumulation and evolution is examined. The results show that the Mao‐1 member nodular limestone comprises abundant marls and packstone to wackestone, and they were deposited in a lower part of the carbonate ramp setting. The marls exhibit rather high organic‐matter abundance and hydrocarbon generation capacity. Natural gas is mostly enriched in the marls developed talc diagenetic shrinkage pores and a certain number of organic‐matter pores, and their reservoir properties are much better than that of packstone‐wackestone. The natural gas in the Mao‐1 member is mainly self‐generated oil pyrolysis gas. The gas reservoir is characterized by the co‐existence of source rocks and reservoir, a lithology‐controlled reservoir, and a structure‐fracture‐controlled enrichment mechanism. Organic‐matter‐rich marl constitutes the material basis for natural gas accumulation. Talc diagenetic shrinkage pores provide storage space for natural gas. Preservation conditions are the key to natural gas accumulation, and natural fractures are beneficial to high gas production. The gas reservoir is characterized by early intraformational enrichment and late interformational adjustment. The finding of the nodular limestone gas reservoir of the Mao‐1 member provides new insights into unconventional gas exploration in the Sichuan Basin, and shows great potential for increasing natural gas reserves and production in China.

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Section: Discussionmentioning

confidence: 99%

A new type of unconventional gas reservoir from the nodular limestones of the Middle Permian Maokou Formation in the south‐eastern Sichuan Basin, south‐west China

Shan

Luo

et al. 2021

Geological Journal

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“…Yang et al [13] combined the evolution of stress, damage, and gas permeability with the deformation of coal and rock. Gao et al [14] and Liu et al [15] considered the thermal effect for extraction of coal seam gas with slotted boreholes. Zhao et al [16] simulated the influence of combination forms of an intact sublayer and a tectonically deformed sublayer of coal on the gas drainage performance of boreholes.…”

Section: Introductionmentioning

confidence: 99%

Coal Seam Gas Extraction by Integrated Drillings and Punchings from the Floor Roadway considering Hydraulic-Mechanical Coupling Effect

et al. 2022

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Owing to the exhaustion of shallow coal resources, deep mining has been occupied in coal mines. Deep buried coal seams are featured by the great ground stress, high gas pressure, and low permeability, which boost the risk of gas disasters and thus dramatically threaten the security about coal mines. Coal seam gas pressure and gas content can be decreased by gas extraction, which is the primary measure to prevent and control mine gas disasters. The coal mass is simplified into a continuous medium with dual structure of pores and fractures and single permeability. In consideration of the combined effects of gas slippage and two-phase flow, a hydraulic-mechanical coupling model for gas migration in coals is proposed. This model involves the equations of gas sorption and diffusion, gas and water seepage, coal deformation, and evolution of porosity and permeability. Based on these, the procedure of gas extraction through the floor roadway combined with hydraulic punching and ordinary drainage holes was simulated, and the gas extraction results were used to evaluate the outburst danger of roadway excavation and to verify the engineering practice. Results show that gas extraction can reduce coal seam gas pressure and slow down the rate of gas release, and the established hydraulic-mechanical coupling model can accurately reveal the law of gas extraction by drilling and punching boreholes. After adopting the gas extraction technology of drilling and hydraulic punching from the floor roadway, the remaining gas pressure and gas content are reduced to lower than 0.5 MPa and 5.68 m3/t, respectively. The achievements set a theoretical foundation to the application of drilling and punching integrated technology to enhance gas extraction.

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“…With CH 4 as its main ingredient, shale gas is treated as a clean and high-efficiency energy resource, making the shale gas industry booming over the past decade. − As shale is identified as pretty tight, how to improve shale gas recovery is one of the key issues for meeting the increasing demand for energy all over the world. ,− Therein, current knowledge indicates that the injection of CO 2 into shale reservoirs is a promising technique and is able to achieve CO 2 sequestration and to enhance gas recovery (CS-EGR) from shale at the same time, resulting in the shale-based CS-EGR being paid increasing attention. − Although this promising technique has been investigated extensively, CS-EGR in shale is still under development and has not yet been implemented widely in the field. Therefore, the CS-EGR technique in shale needs to be strengthened further and thus deserves more investigation, aiming to the potential field practice in a responsible manner.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Permeability Influencing the Performance of Free CH₄ and Free CO₂ during the Process of CO₂ Sequestration and Enhanced Gas Recovery (CS-EGR) from Shale

Zhao

Xie

et al. 2021

ACS Sustainable Chem. Eng.

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To explore how anisotropic permeability affects the performance of free gases (CO 2 and CH 4 ) during the process of sequestrate CO 2 and enhance gas recovery (CS-EGR) in shale reservoirs, this work develops an integrated thermo-hydromechanical (THM) coupling model, where the anisotropic parameter k (k = k h /k v ) is embedded, where k v and k h represent the permeability in the vertical and horizontal directions, respectively. Results indicate that anisotropic permeability has a significant influence on the free gas density, the porosity of shale matrix or fracture, and the content of free gas. A higher k usually enables more free CO 2 to be accumulated in the shale matrix/ fracture and more free CH 4 to be recovered from production wells. Besides, k variation also significantly affects the distribution of free gases, and more free gases tend to migrate along the direction that has a greater permeability. Depending on two self-defined parameters, a higher k makes more adsorbed CH 4 be desorbed and thus is more appropriate for the CH 4 recovery via CS-EGR operation, while ∼65% injected CO 2 is trapped as the adsorbed phase in shale reservoirs under variable k values. Hopefully, the fresh approach in this work will be helpful for deepening knowledge on the CS-EGR behavior in shale.

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Influence of anisotropic and heterogeneous permeability coupled with in-situ stress on CO2 sequestration with simultaneous enhanced gas recovery in shale: Quantitative modeling and case study

Cited by 44 publications

References 49 publications

A new type of unconventional gas reservoir from the nodular limestones of the Middle Permian Maokou Formation in the south‐eastern Sichuan Basin, south‐west China

A new type of unconventional gas reservoir from the nodular limestones of the Middle Permian Maokou Formation in the south‐eastern Sichuan Basin, south‐west China

Coal Seam Gas Extraction by Integrated Drillings and Punchings from the Floor Roadway considering Hydraulic-Mechanical Coupling Effect

Anisotropic Permeability Influencing the Performance of Free CH₄ and Free CO₂ during the Process of CO₂ Sequestration and Enhanced Gas Recovery (CS-EGR) from Shale

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Influence of anisotropic and heterogeneous permeability coupled with in-situ stress on CO2 sequestration with simultaneous enhanced gas recovery in shale: Quantitative modeling and case study

Cited by 44 publications

References 49 publications

A new type of unconventional gas reservoir from the nodular limestones of the Middle Permian Maokou Formation in the south‐eastern Sichuan Basin, south‐west China

A new type of unconventional gas reservoir from the nodular limestones of the Middle Permian Maokou Formation in the south‐eastern Sichuan Basin, south‐west China

Coal Seam Gas Extraction by Integrated Drillings and Punchings from the Floor Roadway considering Hydraulic-Mechanical Coupling Effect

Anisotropic Permeability Influencing the Performance of Free CH4 and Free CO2 during the Process of CO2 Sequestration and Enhanced Gas Recovery (CS-EGR) from Shale

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Anisotropic Permeability Influencing the Performance of Free CH₄ and Free CO₂ during the Process of CO₂ Sequestration and Enhanced Gas Recovery (CS-EGR) from Shale