A robust NMR method to measure porosity of low porosity rocks

Yan, Weibo; Sun, Jianmeng; Sun, Yang; Golsanami, Naser

doi:10.1016/j.micromeso.2018.02.022

Cited by 40 publications

(22 citation statements)

References 8 publications

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“…The difficulty in the characterization of shale reservoirs is the quantitative description of micropore and mesopore structures. A variety of experiments have been used to study the pore structure, including scanning electron microscopy (SEM) [15][16][17], atomic force microscopy (AFM) [18,19], small-angle X-ray (SAXS) [20,21], small-angle/ultra-small-angle neutron scattering (SANS/USANS) [22][23][24][25][26], nuclear magnetic resonance (NMR) [27][28][29][30], high-pressure mercury intrusion (HMIP) [31][32][33][34] and low-temperature liquid nitrogen/carbon dioxide adsorption (LP-N 2 /CO 2 GA) [23][24][25]31,35]. Among these, LP-N 2 /CO 2 GA analysis has been proven to be an effective method in characterizing the pore size distribution of micropores and mesopores [23][24][25]31].…”

Section: Introductionmentioning

confidence: 99%

Fractal Characteristics of Micro- and Mesopores in the Longmaxi Shale

2020

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To better understand the variability and heterogeneity of pore size distributions (PSDs) in the Longmaxi Shale, twelve shale samples were collected from the Xiaoxi and Fendong section, Sichuan Province, South China. Multifractal analysis was employed to study PSDs of mesopores (2–50 nm) and micropores (<2 nm) based on low-pressure N2/CO2 adsorption (LP-N2/CO2GA). The results show that the PSDs of mesopores and micropores exhibit a multifractal behavior. The multifractal parameters can be divided into the parameters of heterogeneity (D−10–D10, D0–D10 and D−10–D0) and the parameters of singularity (D1 and H). For both the mesopores and micropores, decreasing the singularity of the pore size distribution contributes to larger heterogeneous parameters. However, micropores and mesopores also vary widely in terms of the pore heterogeneity and its controlling factors. Shale with a higher total organic carbon (TOC) content may have a larger volume of micropores and more heterogeneous mesopores. Rough surface and less concentrated pore size distribution hinder the transport of adsorbent in mesopores. The transport properties of micropores are not affected by the pore fractal dimension.

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Section: Introductionmentioning

confidence: 99%

Fractal Characteristics of Micro- and Mesopores in the Longmaxi Shale

2020

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“…21,29,30 EGS reservoirs consist of the complex fracture network, propagation and fracture roughness 31 that were formed during the fracturing process. The morphology of the fracture void 32 and the matrix pores 33 influence the flow behavior and inaccurate prediction of the CO 2 sequestration. Using THM coupled model and multi-fracture discrete network, Shi et al 34,35 performed numerical simulation in an EGS using CO 2 as a circulating fluid.…”

Section: Discussionmentioning

confidence: 99%

Combination of double and single cyclic pressure alternation technique to increase CO ₂ sequestration with heat mining in enhanced geothermal reservoirs by thermo‐hydro‐mechanical coupling method

Sun

Bongole

et al. 2020

Int J Energy Res

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Summary The rise in global temperature due to an unceasingly increase in non‐condensable gases (NCG) prompts more development of safe and economical CCUS (Carbon Capture Utilization and Storage) technologies. Carbon dioxide (CO2) sequestration with heat mining in deep enhanced geothermal systems (EGSs) is one of the promising methods to reduce CO2 emitted to the atmosphere. In this study, a cyclic alternation of pressures at the injection and production wells is applied in an EGS for heat mining together with CO2 deposit. Simultaneous alternation of the injection and production pressures can significantly increase the amount of CO2 sequestrated compared to applying a fixed pumping or withdrawing pressures at the injector and producer respectively. At the injection well, alternation in pumping pressures at high frequency (small interval of days) increased CO2 sequestration rate. Reducing the pumping frequency resulted in the lowering of the total amount of CO2 sequestrated, lesser than using a fixed pumping pressure. The alternation in pumping frequency has a direct relationship to the CO2 sequestration rate. The frequency of the injection and production pressures refers to the interval in days of the interchange in pressure between high to a low value and vice‐versa. Furthermore, simultaneous alternation of pressures at the injection and production wells respectively (double cyclic method) improved geothermal heat extraction efficiency, thus higher performance for both geothermal and CO2 sequestration projects.

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“…The composition of shale matrix, organic matter characteristics i.e. type, richness and maturity, structure of pores, pressure, temperature and water content are the main controlling factors that affect the physics and laws in shale gas storage [28][29]. The mechanism of shale gas storage changes due to these controlling factors and resulted behavior of free, adsorbed and absorbed gas (total gas storage) is altered.…”

Section: Mechanism and Parameters For Shale Gip Calculationsmentioning

confidence: 99%

“…The adsorbed and absorbed gas contributes in term of total gas storage about 20-80% [11] and 22% [12], respectively. The absorbed gas remains associated with adsorbed gas but previous studies underestimated such gas in predicting the gas sorption and production behavior [13][14][15][16]; However, it is broadly recognized as gas dissolved into organic matter but has not yet attracted enough attention [17,18].…”

Section: Introductionmentioning

confidence: 99%

Measurement of shale gas in place based on different approaches and their comparison study

Memon

Ren

et al. 2021

THERM SCI

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The understanding of gas sorption mechanism is essential to characterize the original gas-in-place for shale gas reservoirs. In this study, experimental data of five shale samples have been used to estimate the shale gas-in-place with new sights. Langmuir model is commonly used to measure the amount of adsorbed gas but this model does not include the amount of absorbed gas and its behavior. However, such gas usually contributes about 22% in respect to total gas storage even though its input remains undefined. Sorption model used in this study includes adsorbed and absorbed gas. Good results are obtained from sorption model as compared to Langmuir model. Variable range of total gas storage is observed using different approaches in all shale samples. Initially at low pressure, total gas storage is observed to be higher because of gas absorption contribution in new proposed approach when compared to approach-2. When pressure increases, total gas storage is altered in keeping with characteristics of adsorption and absorption of gas. Adsorbed and sorbed porosity is estimated at two different approaches and where total gas storages capacity is affected due to adsorbed or sorbed porosity. Further, the contribution of absorbed gas amount is found at about 19-22% in respect to total gas storage in all shale samples and that is in same range as mentioned in literature. The sorption model and new proposed approach includes adsorption and absorption of gases and provides new insights to understand the gas storage mechanisms and estimation of shale gas-in-place.

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A robust NMR method to measure porosity of low porosity rocks

Cited by 40 publications

References 8 publications

Fractal Characteristics of Micro- and Mesopores in the Longmaxi Shale

Fractal Characteristics of Micro- and Mesopores in the Longmaxi Shale

Combination of double and single cyclic pressure alternation technique to increase CO ₂ sequestration with heat mining in enhanced geothermal reservoirs by thermo‐hydro‐mechanical coupling method

Measurement of shale gas in place based on different approaches and their comparison study

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A robust NMR method to measure porosity of low porosity rocks

Cited by 40 publications

References 8 publications

Fractal Characteristics of Micro- and Mesopores in the Longmaxi Shale

Fractal Characteristics of Micro- and Mesopores in the Longmaxi Shale

Combination of double and single cyclic pressure alternation technique to increase CO 2 sequestration with heat mining in enhanced geothermal reservoirs by thermo‐hydro‐mechanical coupling method

Measurement of shale gas in place based on different approaches and their comparison study

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Combination of double and single cyclic pressure alternation technique to increase CO ₂ sequestration with heat mining in enhanced geothermal reservoirs by thermo‐hydro‐mechanical coupling method