Characteristics, capability, and origin of shale gas desorption of the Longmaxi Formation in the southeastern Sichuan Basin, China

Tang, Xianglu; Jiang, Zhenxue; Jiang, Shu; Lü, Cheng; Zhong, Ningning; Tang, Ling; Chang, Jiaqi; Zhou, Wen

doi:10.1038/s41598-018-37782-2

Cited by 15 publications

(13 citation statements)

References 51 publications

(59 reference statements)

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“…Moreover, increasing trend of BET surface area with respect to the organic matters has already been stated by many workers (Yang et al, 2014;Shao et al, 2017;Tang et al, 2019;etc. ), and no significant correlation has been observed by Sun et al (2016) and Ross and Bustin (2009).…”

Section: Discussionmentioning

confidence: 59%

Pore structures and fractal dimensions in Early Permian Barakar shales of Rajmahal Basin, Jharkhand, India

et al. 2021

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The proximate, low-pressure N 2 sorption, X-ray diffraction, and organic petrography parameters have been used to delineate the pore structures and fractal dimensions in the Barakar shales of Rajmahal Basin, India. The information has been utilized for the assessment of shale gas reservoir and to know about the mode of occurrence and storage capacity of shales for the entrapment of methane (CH 4 ). The studied shales are characterized by high fixed carbon contents (10.14-46.09 wt.%) and contain significant abundance of brittle minerals, like quartz (6.0-51.6%) and mica (1.0-41.2%). The petrographic observations show that the studied samples comprise of numerous laths of vitrinite (collotelinite and vitrodetrinite) and semifusinite macerals and quartz grains. The data of low-pressure N 2 sorption analysis indicates the shales encompass mainly meso-to macropores and microfractures. The total pore volume, average pore size, and multipoint BET surface area of the studied shales vary from 0.012 to 0.023 cc/g, 8.295 to 10.840 nm, and 5.752 to 10.390 m 2 /g respectively. Two types of fractal dimensions (D 1 and D 2 ) have been calculated by using FHH (Frankel-Halsey-Hill) method from the N 2 adsorption isotherm. The high values of fractal dimensions (2.1949 < D 1 < 2.4837 and 2.6668 < D 2 < 2.7247) are indicating the highly rugged pore surface or complexity in the pore structures.

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Section: Discussionmentioning

confidence: 59%

Pore structures and fractal dimensions in Early Permian Barakar shales of Rajmahal Basin, Jharkhand, India

et al. 2021

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“…Additionally, the vitrinite relative to the other ingredients has a stronger adsorption ability, and III kerogen contains a higher concentration of vitrinite, thus, enhancing the adsorption ability of the shale. The Longmaxi and Qiongzhusi shales, of the same organic type as North American shales, are highly thermally evolved with more developed organic pores, leading to increased adsorption capacity [4,28,31].…”

Section: Discussionmentioning

confidence: 99%

“…China's shale gas production reached 154 × 10 8 m 3 in 2019. The Sichuan Basin is an important petroliferous basin where China's shale gas exploration and development has made the most rapid progress and the earliest commercial development [4,5].…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Origin of Methane Adsorption Capacity of Marine, Transitional, and Lacustrine Shales in Sichuan Basin, China

Tang

Wu²,

Zhong³

et al. 2021

Geofluids

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Adsorbed gas is an important component of shale gas. The methane adsorption capacity of shale determines the composition of shale gas. In this study, the methane adsorption capacity of marine, transitional, and lacustrine shales in the Sichuan Basin was analyzed through its isothermal adsorption, mineral composition, water content, etc. The results show that the methane adsorption capacity of marine (Qiongzhusi Formation and Longmaxi Formation), transitional (Longtan Formation), and lacustrine (Xujiahe Formation and Ziliujing Formation) shales is significantly different. The Longtan Formation has the strongest methane adsorption capacity. This is primarily related to its high organic matter and organic matter type III content. The methane adsorption capacity of the lacustrine shale was the weakest. This is primarily related to the low thermal evolution degree and the high content of water-bearing clay minerals. Smectite has the highest methane adsorption capacity of the clay minerals, due to its crystal structure. The water content has a significant effect on methane adsorption largely because water molecules occupy the adsorption site. Additionally, the temperature and pressure in a specific range significantly affect methane adsorption capacity.

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“…Shale gas is stored in and yields from the micro-nano scale pore network of shale, which is of high complexity and high heterogeneity. The storage and microstructural properties of the pore system in shale are crucial to the estimation of geological reserves and the gas exploitation process. , Numerous studies have been done on the storage and structural properties’ characterization for shallow shale, , and the shale composition is found to be important to the storage capacity (e.g., porosity and gas adsorption capacity). − As compared to the shallow shale, deep shale has undergone more intense compaction and thermal evolution, which are crucial to the pore evolution and fluid storage property. − However, the studies on storage property and its controlling factor analysis of deep shale are rarely carried out because the breakthrough of deep shale gas development in the Luzhou Block was achieved only two years ago (in 2019). , Therefore, quantitative characterization of the fluid storage and structural properties of deep shale and further clarifying their controlling factors are essential to the development of deep shale gas reservoirs in Sichuan Basin as the next step.…”

Section: Introductionmentioning

confidence: 99%

“…The storage and microstructural properties of the pore system in shale are crucial to the estimation of geological reserves and the gas exploitation process. 10,11 Numerous studies have been done on the storage and structural properties' characterization for shallow shale, 12,13 and the shale composition is found to be important to the storage capacity (e.g., porosity and gas adsorption ca- pacity). 14−17 As compared to the shallow shale, deep shale has undergone more intense compaction and thermal evolution, which are crucial to the pore evolution and fluid storage property.…”

Section: Introductionmentioning

confidence: 99%

Controlling Factor Analysis of Microstructural Property and Storage Capacity of Deep Longmaxi Formation Shale in Sichuan Basin

et al. 2021

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As the commercial development of shallow shale gas reservoirs has been successfully achieved in Sichuan Basin, the deep shale gas reservoirs become the key development target in the next step. The accurate quantitative characterization of the fluid storage and structural properties of deep shale is of great significance in resource evaluation and gas exploitation. In this study, fifteen deep Longmaxi Formation shale samples belonging to three sublayers are collected from the L208 well area, Luzhou Block, southern Sichuan Basin. Nuclear magnetic resonance and nitrogen adsorption are conducted on these samples to obtain the fluid storage capacity and microstructural information. Pore fractal dimension and surface fractal dimension are interpreted from these experimental data for quantitative evaluation of the pore distribution complexity and pore surface irregularity, respectively. The controlling factors of storage and microstructural properties of these deep shales are analyzed. From the perspective of stratigraphic division, the shales belonging to the lower sublayers possess a larger transverse relaxation time of the main peak, a weaker nitrogen adsorption amount, a lower pore volume, a lower specific surface area, and a higher surface fractal dimension as compared to those of the shales from the upper sublayer. From the perspective of shale composition, clay mineral content and total organic carbon content are the main and minor controlling factors of the storage capacity, pore fractal dimension, and surface fractal dimension of deep Longmaxi shale, respectively. Moreover, the pore surface irregularity is relevant to the average pore diameter and specific surface area.

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Characteristics, capability, and origin of shale gas desorption of the Longmaxi Formation in the southeastern Sichuan Basin, China

Cited by 15 publications

References 51 publications

Pore structures and fractal dimensions in Early Permian Barakar shales of Rajmahal Basin, Jharkhand, India

Pore structures and fractal dimensions in Early Permian Barakar shales of Rajmahal Basin, Jharkhand, India

Characteristics and Origin of Methane Adsorption Capacity of Marine, Transitional, and Lacustrine Shales in Sichuan Basin, China

Controlling Factor Analysis of Microstructural Property and Storage Capacity of Deep Longmaxi Formation Shale in Sichuan Basin

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