Gas-in-place and its influence factors of the upper Paleozoic coal-bearing shale in the Qinshui Basin, China

Lu, Chengang; Gao, Ping; Li, Gang; Yuan, Feng; Qu, Xiaorong; Su, Yufei; Xiao, Xia

doi:10.1007/s11707-022-1045-7

Cited by 3 publications

(8 citation statements)

References 83 publications

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“…Clay minerals usually contain lots of micropores, which can provide larger pore SSA, and therefore is considered an important factor affecting adsorption capacity. ,, In contrast, Chen et al observed a negative correlation between the methane adsorption capacity and clay content, suggesting that the clay minerals may also lead to a decrease in methane adsorption capacity . It is noteworthy that the types and quantities of clay minerals are also important reasons for the different phenomena mentioned above.…”

Section: Resultsmentioning

confidence: 99%

“… 15 , 25 However, Lu et al discovered a positive correlation between the methane adsorption capacity and TOC content (0.92% < TOC < 5.24%), followed by a negative correlation (TOC > 8.54%). 46 Some scholars have also proposed that the negative correlation between adsorption capacity and excessive TOC content is mainly related to the collapse of some OM-hosted pores. 47 , 48 In this study, there is a certain positive correlation between TOC and adsorption capacity ( Figure 2 a), but the correlation is weak ( R 2 = 0.681), and it is speculated that the weaker correlation is closely related to the modification of OM-hosted pores by tectonic compression.…”

Section: Resultsmentioning

confidence: 99%

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Characteristics and Controlling Factors of Methane Adsorption of the Longmaxi Shale in Northeastern Chongqing: Implications for Shale Gas Occurrence in Complex Structural Areas

Miao,

Shang,

Zhu

et al. 2024

ACS Omega

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Accurately determining the adsorption capacity of Longmaxi shale in complex structural areas is crucial for evaluating the shale gas resources in northeastern Chongqing. However, studies on the pore characteristics and methane adsorption capacity of these Longmaxi shales are currently limited. In this paper, we collected core samples from the YDB-1 well in northeastern Chongqing and determined the pore structure and adsorption capacity of the Longmaxi shale using low-pressure gas adsorption and high-temperature, high-pressure methane adsorption experiments, respectively. The results indicate that the adsorption capacity of shale in complex structural areas is significantly positively correlated with the organic matter (OM) content, weakly positively correlated with the quartz content, and weakly negatively correlated with clay minerals. Meanwhile, gas-in-place content is simultaneously controlled by the pressure and temperature of the reservoir, and with increasing depth, the adsorbed gas rapidly increases to a maximum value (at 0.8 km) and then slowly decreases, whereas the free gas continuously increases. Compared with the shale in the stable structural areas, the Longmaxi shale in complex structural areas usually develops OM-hosted pores and intergranular pores of OM and minerals and contains more micropores due to tectonic compression, resulting in a relatively larger specific surface area and adsorption capacity. This is the reason shale in complex structural areas has high development potential. The final result can provide an important basis for the evaluation of the gas content and the optimization of dessert areas in the Lower Paleozoic shale gas in southern China.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Characteristics and Controlling Factors of Methane Adsorption of the Longmaxi Shale in Northeastern Chongqing: Implications for Shale Gas Occurrence in Complex Structural Areas

Miao,

Shang,

Zhu

et al. 2024

ACS Omega

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“…24 This approach utilizing astronomical cycles has become another novel method for studying OM enrichment in shale deposits, leveraging the cyclic nature of astronomical cycles and global depositional setting provided by astronomical time scales to provide much information on OM enrichment. 25−28 During the C−P epoch, the Qinshui Basin received a series of MCT, 29 which is situated within the center region of the North China Block (NCB). The coal-bearing shale deposits of the Upper Carboniferous−Lower Permian Taiyuan Formation (TY) and Shanxi Formation (SX) hold substantial shale gas resource potential.…”

Section: Introductionmentioning

confidence: 99%

“…During the C–P epoch, the Qinshui Basin received a series of MCT, which is situated within the center region of the North China Block (NCB). The coal-bearing shale deposits of the Upper Carboniferous–Lower Permian Taiyuan Formation (TY) and Shanxi Formation (SX) hold substantial shale gas resource potential .…”

Section: Introductionmentioning

confidence: 99%

Geochemical Constraints and Astronomical Forcing on Organic Matter Accumulation of Marine–Continental Transitional Shale Deposits in the Qinshui Basin during the Carboniferous–Permian Transition

Lu,

Gao,

Tiong

et al. 2024

ACS Earth Space Chem.

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During the Carboniferous–Permian transition, the paleoclimate of Earth transitioned from an icehouse to a greenhouse state, severely impacting the burial patterns of organic matter (OM). Within the Upper Carboniferous–Lower Permian Taiyuan–Shanxi formations (TY–SX) in the Qinshui Basin, North China, lie a series of marine–continental transitional organic-rich shale deposits. However, the mechanism behind the enrichment of OM in these shale deposits, formed during the icehouse–greenhouse transition, remains unclear. To address this issue, a suite of transitional shale deposits was investigated by using geochemical and astronomical cyclostratigraphic analyses. The results show that the depositional age of TY–SX spans from 293.65 to 300.64 ± 0.412 Ma. The depositional environments of these TY–SX shales tended toward oxidation, with the TY shales slightly more reducing than the SX shales. The paleoclimate of the TY–SX shales suggests warm and humid environments with comparatively strong chemical weathering intensity. Primary productivity in these TY–SX shales was estimated to be low, but the influx of terrigenous detritus was robust, driving OM accumulation through terrigenous inputs. The 405-kyr astronomical cycle had a forcing effect on the paleoenvironment variations, and the 173-kyr astronomical cycle showed a covariance with OM enrichment. The TY shales exhibited a stable and moderate sedimentation rate, with enhanced terrigenous OM input leading to OM enrichment, whereas the OM contents of the SX shales, deposited under conditions of low primary productivity and oxidation, experienced dilution of the OM content owing to detrital inputs.

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“…Conventional pore structure parameters of shales mainly include pore size, pore size distribution (PSD), pore types, pore-specific surface area (SSA), and pore volume (PV). − A variety of techniques and methods has been applied to quantitatively characterize the shale pore structure, such as low-pressure CO 2 and N 2 adsorptions (LPCA and LPNA), high-pressure mercury injection (MICP), small and ultrasmall angle neutron scattering (SANS/USANS), and nuclear magnetic resonance (NMR). ,− In these methods, LPCA and LPNA experiments are usually applied to obtain PSD, SSA, and PV, which are effective in characterizing the shale pore structure. ,,− …”

Section: Introductionmentioning

confidence: 99%

Fractal Characteristics of Nanopores and Their Controlling Factors of the Lower Cambrian Shale in the Western Hubei Area, South China

Li,

Gao,

et al. 2023

Energy Fuels

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The Lower Cambrian shale is one of the most important marine shale reservoirs in South China, which has huge potential for shale gas resources. However, the Lower Cambrian shale displays strong pore heterogeneity, influencing shale gas exploration. Based on the low-pressure N2 adsorption (LPNA) of the Lower Cambrian shale samples and their isolated kerogens in the western Hubei area, South China, fractal dimensions and their controlling factors of shale nanopores have been investigated. In this study, the pore specific surface area (SSA) and pore volume (PV) of isolated kerogen samples are mainly contributed from micropores and non-micropores, respectively, which are consistent with those of whole-rock samples. The average fractal dimensions of whole-rock samples are higher than those of isolated kerogen samples, suggesting that organic matter (OM) controls the shale pore structure and exerts major influences on fractal characteristics of nanopores and inorganic mineral (IM) enhances the complexity of shale nanopores. The correlations between fractal dimensions and total organic carbon (TOC) and IM contents of whole-rock samples further indicate that the OM simultaneously affects the heterogeneities of the pore surface and structure, while the IM mainly affects the heterogeneity of the pore structure. They both control the fractal characteristics of nanopores in the Lower Cambrian shale. Compared with the Upper Carboniferous–Lower Permian marine-continental transitional (MCT) shale and the Lower Silurian marine shale, the D 1 and D 2 of the studied marine shale display relatively lower and higher values, respectively, revealing that the Lower Cambrian shale has relatively weak adsorption capacity, as well as poor permeability and connectivity.

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Gas-in-place and its influence factors of the upper Paleozoic coal-bearing shale in the Qinshui Basin, China

Cited by 3 publications

References 83 publications

Characteristics and Controlling Factors of Methane Adsorption of the Longmaxi Shale in Northeastern Chongqing: Implications for Shale Gas Occurrence in Complex Structural Areas

Characteristics and Controlling Factors of Methane Adsorption of the Longmaxi Shale in Northeastern Chongqing: Implications for Shale Gas Occurrence in Complex Structural Areas

Geochemical Constraints and Astronomical Forcing on Organic Matter Accumulation of Marine–Continental Transitional Shale Deposits in the Qinshui Basin during the Carboniferous–Permian Transition

Fractal Characteristics of Nanopores and Their Controlling Factors of the Lower Cambrian Shale in the Western Hubei Area, South China

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