Shale gas exploration and development in the Sichuan Basin: Progress, challenge and countermeasures

Zhang, L.; He, Xiaojia; Li, X.; Li, K.; He, Jianhua; Zhang, Z.; Guo, Jianchun; Chen, Y.; Liu, W.

doi:10.1016/j.ngib.2021.08.024

Cited by 40 publications

(23 citation statements)

References 2 publications

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“…Commercial shale gas exploitation in the United States has provided favorable insights for many countries. − After long-term theoretical research and exploitation practice, China has made continuous breakthroughs in gas production in Fuling, Changning, and Weiyuan in the Sichuan Basin, South China. The annual shale gas production in China exceeded 200 × 10 8 m 3 in 2020. − At present, shale gas development in China is concentrated in marine shale with a large thickness, excellent continuity, high organic matter (OM) abundance and maturity, and high brittle mineral content . Compared with marine shale, coal measure shale formed in the marine–continental transitional environment is more widely distributed in China, and the recoverable resources account for 35.8% of the total shale gas .…”

Section: Introductionmentioning

confidence: 99%

“…Coal measure shale is adjacent to coal seams, which is accompanied by a large cumulative thickness, wide variation in OM abundance and maturity, and high clay mineral content. − Several coal measure gas production bases have been established in the eastern Ordos Basin and southern Qinshui Basin, North China . For South China, coal measure shale is mainly distributed in Sichuan, eastern Yunnan, and western Guizhou, which is formed on the basis of late Permian coal-bearing formations. , In 2020, the Jinghe-1well obtained a gas flow of 12019 m 3 /d in the Permian shale, which indicates excellent potential for gas exploitation …”

Section: Introductionmentioning

confidence: 99%

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Geochemical Composition and Microstructure of Coal Measure Shale in the Upper Permian, Western Guizhou, China: Implications for Methane Generation and Storage

Zhang

Kang

et al. 2022

Energy Fuels

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Substantial coal measure gas is reserved in the Upper Permian shale in western Guizhou, China, but the mechanism of gas generation and enrichment remains unclear. In this study, rock-eval pyrolysis, stable carbon isotope, and low-temperature N2/CO2 adsorption (LN2/CO2A) experiments were conducted on coal measure shale collected from western Guizhou. The geochemical composition and pore morphology were clarified, and the shale gas generation and storage characteristics were ultimately revealed. The results show that the total organic carbon (TOC) contents of most samples exceed 2%, indicating a high organic matter (OM) abundance. The average R o and T max are 2.89% and 576 °C, respectively, corresponding to the overmature stage, leading to the poor current hydrocarbon generation potential. Unlike marine shale with dense organic pores, these pores are generally poorly developed and heterogeneous in the samples. Densely distributed microfractures are favorable methane migration channels. The pores are dominated by mesopores, with an average pore volume (PV) proportion of 53.55%, while the specific surface area (SSA) is mainly contributed by micropores. The LCO2A-SSA and LCO2A-PV show a positive correlation with the TOC, T max, and S1, but the LN2A-SSA and LN2A-PV are poorly correlated with these parameters, indicating that micropores are mainly derived from organic pores and that hydrocarbons generated by OM pyrolysis are mainly reserved in micropores. When δ13COM shows a negative anomaly, R o, T max, and S1 all show a negative drift in the vertical sequence, suggesting that the chemical parameters are closely related during thermal maturation. Accompanied by hydrocarbon generation, 12CH4 is preferentially separated from the OM, resulting in a higher δ13COM. Meanwhile, the generated methane is mainly reserved in the form of adsorption, and the micropores/mesopores provide a favorable place for shale gas storage.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geochemical Composition and Microstructure of Coal Measure Shale in the Upper Permian, Western Guizhou, China: Implications for Methane Generation and Storage

Zhang

Kang

et al. 2022

Energy Fuels

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“…The east of the Sichuan Basin is the Daloushan Fold Belt, the south is the Emeishan Fold Belt, the west is the Longmenshan Fault Zone, and the north is the Qinling-Dabieshan Orogenic Belt. According to the regional tectonic characteristics, the interior of the Sichuan Basin is further divided into six secondary structural units, namely, the low-gentle structural belt in northern Sichuan, the low-steep structural belt in western Sichuan, the gentle structural belt in central Sichuan, the high-steep structural belt in eastern Sichuan, the low-fold structural belt in southwestern Sichuan, and the low-steep structural belt in southern Sichuan (Zhang, 2021;Zhang et al, 2021;Zou et al, 2022). The study area is located in the low-steep structural belt in southern Sichuan (Figure 1).…”

Section: Geological Backgroundmentioning

confidence: 99%

Evaluation of fracturability of shale reservoirs in the longmaxi formation in southern sichuan basin

et al. 2022

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Major breakthroughs have been made in the exploration and development of shale gas in the Longmaxi Formation in the southern Sichuan Basin, China. The previous have adopted various methods to study the fracturability of shale, but the quantitative characterization of the comprehensive properties of shale during hydraulic fracturing is still difficult. For this reason, in this study, taking the Longmaxi Formation shale in the Changning and Luzhou Blocks in the southern Sichuan Basin as an example, the mineral composition, petrophysical properties, rock mechanical properties and in-situ stress of the shale were systematically studied using X-ray diffraction, pulsed porosity-permeability analysis, rock mechanics and in-situ stress tests. Furthermore, the brittle mineral content, elastic modulus, and in -situ stress parameters were calculated, and the Analytic Hierarchy Process (AHP) method was adopted to establish a comprehensive evaluation index of shale fracturability. The research results show that the shale of the Longmaxi Formation in southern Sichuan is dominated by mixed shale facies, and it has the characteristics of high content of brittle minerals, low porosity, large compressive strength and Young’s modulus, and small value of in-situ stress difference coefficient. Therefore, the Longmaxi Formation shale has good fracturing conditions. TOC and quartz contents have important effects on the fracturability of the Longmaxi shale. The analytic hierarchy process was adopted to determine the weight coefficients of the modulus brittleness index, mechanical brittleness index, in-situ stress difference coefficient, rock compressive strength and TOC content. Furthermore, a comprehensive evaluation index of fracturability was constructed. Calculations show that the comprehensive fracability indices of shale in the Changning and Luzhou Blocks are 0.49 and 0.59, respectively. Moreover, the quality of shale in the Luzhou Block is better than that in the Changning Block, which is related to the organic matter and quartz content and the microscopic pore structures inside the shale.

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“…China began shale gas exploration and development in 2012 and is currently developing shale gas on a large commercial scale in the Sichuan Basin. China has produced 20.04 billion m 3 of shale gas, ranking second worldwide in 2020 [2]. In addition, as the development area expands, deeper shales with depths of more than 4000 m are being developed [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Influence of Particle Size on the Low-Temperature Nitrogen Adsorption of Deep Shale in Southern Sichuan, China

Zhan

et al. 2022

Minerals

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Pore characteristics are one of the most important elements in the study of shale reservoir properties and are a key parameter for the evaluation of the potential of shale oil and gas resources. Low-temperature nitrogen adsorption is a common laboratory method that is used to characterize the pore structure of shale. However, the effect of shale’s particle size on the experimental results of the nitrogen adsorption of deep shale samples is still unclear. In this paper, using deep shale samples of different mesh sizes from the Luzhou Block as an example, we studied the effect of particle size on the pore structure of deep shale, as characterized by nitrogen adsorption experiments. The results showed that the pore volume of deep shale is mainly distributed in the mesoporous range, with a pore size ranging from 2 to 20 nm. The pore volume, as measured by nitrogen adsorption, increases slowly as the particle size decreases and then it increases rapidly. The particle size of shale has no obvious effect on the measurement of the specific surface area. The fractal dimension of deep shale gradually increases as the particle size of the shale samples increases and the smaller the particle size, the higher the correlation coefficient, R2, of the fractal dimension fitting. In this paper, different recommended sizes are given for selecting suitable particle sizes in nitrogen adsorption experiments on deep shale with different structural parameters, which will increase the accuracy of the study of the pore structure of deep shale.

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Shale gas exploration and development in the Sichuan Basin: Progress, challenge and countermeasures

Cited by 40 publications

References 2 publications

Geochemical Composition and Microstructure of Coal Measure Shale in the Upper Permian, Western Guizhou, China: Implications for Methane Generation and Storage

Geochemical Composition and Microstructure of Coal Measure Shale in the Upper Permian, Western Guizhou, China: Implications for Methane Generation and Storage

Evaluation of fracturability of shale reservoirs in the longmaxi formation in southern sichuan basin

Influence of Particle Size on the Low-Temperature Nitrogen Adsorption of Deep Shale in Southern Sichuan, China

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