Geochemical characteristics and sedimentary environment of the Middle Devonian organic-rich shales in the Northwest of Guizhong Depression, Southwest China

Yuan, Kun; Huang, Wenhui; Fang, Xingxing; Li, Shizhen; Wang, Ting; Lin, Tian; Liu, Guoheng

doi:10.31035/cg2020062

Cited by 9 publications

(4 citation statements)

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“…It indicates that the organic matter contributes more to the micropores, which was also observed from all of the densely packed organic matter pores in Figure 4. Through the comparison of the shale mineral content and pore characteristics, it is found that there is a certain correlation between shale pores and mineral content in different pore size ranges [35]. The specific surface area and pore volume show a positive correlation with quartz and clay minerals, but a negative correlation with carbonate minerals.…”

Section: Discussion On Shale Pore Controlmentioning

confidence: 94%

“…In addition, the pores between carbonate particles are easily cemented and filled by clay minerals and organic matter, so the content of carbonate minerals is negatively correlated with the pore volume and specific surface area (Figure 10c,d). Through the comparison of the shale mineral content and pore characteristics, it is found that there is a certain correlation between shale pores and mineral content in different pore size ranges [35]. The specific surface area and pore volume show a positive correlation with quartz and clay minerals, but a negative correlation with carbonate minerals.…”

Section: Discussion On Shale Pore Controlmentioning

confidence: 94%

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The Whole-Aperture Pore Structure Characteristics and Their Controlling Factors of the Dawuba Formation Shale in Western Guizhou

et al. 2022

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Since shale gas mainly occurs in shale pores, research on pore structure characteristics is the key to understanding the shale gas accumulation mechanism. The pore structure of the Lower Carboniferous Dawuba Formation shale in the Qianxi area, represented by the well QSD-1, which obtains a daily shale gas flow of 10,000 m3 and represents an important breakthrough in the investigation of marine shale gas in the Upper Paleozoic region of southern China, is characterized by high-pressure mercury compression experiments and low-temperature gas adsorption (N2 and CO2) experiments with whole pore size. The main controlling factors affecting the pore development of the shale are discussed. (i) The micropores and mesopores are more developed in the shale, and the macropores are the second most developed in the shales of the Dawuba Formation in the Qianxi area, among which the mesopores and macropores contribute most to the pore volume and the micropores and mesopores contribute most to the pore-specific surface area. (ii) The microfractures and interlayer pores of clay minerals are developed in the shales of the Dawuba Formation, which are the main storage spaces for hydrocarbon gases. (iii) The main factors affecting the adsorption capacity of the shales of the Dawuba Formation in the Qianxi area are the organic carbon content and clay mineral content of the shales, both of which have an obvious positive correlation with the variation of pore structure.

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Section: Discussion On Shale Pore Controlmentioning

confidence: 94%

Section: Discussion On Shale Pore Controlmentioning

confidence: 94%

The Whole-Aperture Pore Structure Characteristics and Their Controlling Factors of the Dawuba Formation Shale in Western Guizhou

et al. 2022

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“…By the Triassic, the Yuebei and Yangtze blocks collided, and the stress direction within the aulacogen began to change. The Paleo-Tethys subducted to the north and east, causing intense subsidence within the aulacogen, and by the end of the Late Triassic, seawater completely withdrew, the basin closed, and the aulacogen was uplifted to form a landmass [31][32][33][34][35]. An NW-trending fold-fault belt formed along the structural line.…”

Section: Geological Settingmentioning

confidence: 99%

Carboniferous Shale Gas Accumulation Characteristics and Exploration Directions in South China

et al. 2023

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China has focused on the exploration and development of shale gas resources to reduce its reliance on coal and shift to cleaner energy sources. While significant progress has been made in the Sichuan Basin, unlocking the shale gas potential in other regions of South China has proven challenging due to the complex geology and mountainous terrain. In 2021, Well QSD-1 was deployed in southwestern Guizhou and achieved a daily shale gas flow of 11,011 m3 in the Dawuba Formation, marking the first time an industrial gas flow had been obtained from shale gas drilling in the marine strata of the Upper Paleozoic in China. This breakthrough has deepened the understanding of the southern China Carboniferous marine strata and highlighted key aspects of the formation: (1) Sedimentation occurred in alternating platforms and basins, with most organic-rich shale developed in sloping and basin areas; (2) the formation exhibits favorable static indicators, with a relatively thick section (over 200 m), and an organic carbon content of approximately 1%; (3) the intercalation of argillaceous limestone and shale intervals is conducive to the preservation of shale gas within the formation. These results demonstrate the potential for the Upper Paleozoic in South China to become a significant shale gas producer, which could contribute significantly to China’s energy security. Furthermore, exploring shale gas in the region may have positive economic and environmental impacts, including reducing China’s dependence on coal and decreasing greenhouse gas emissions.

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“…The Youjiang Basin is an important oil and gas resource area in southern China, and also the main area of marine sedimentation in the Upper Paleozoic (Wang and Groves, 2018). The shale of the Middle Devonian Luofu Formation is characterized by shallow burial depth, large sediment thickness and su cient hydrocarbon generation potential (Du et al, 2009;Yuan et al, 2020). During the Middle Devonian period, the paleogeographic pattern of platform basin alternation led to different distributions of shale organic matter.…”

Section: Introductionmentioning

confidence: 99%

A novel method for evaluating shale gas preservation conditions in an area on a regional scale

Liu,

Shi,

Feng

et al. 2024

Preprint

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The Youjiang Basin is the main area of the Middle Devonian shale gas resources in southern China, with complex geological conditions, diverse stratigraphic structures, low level of exploration and limited hydrocarbon geological data. In this study, a method is proposed for evaluating the regional shale gas preservation conditions, by which it is easy to obtain information (using available data from regional geological maps) and to process data (processed by computer software). This method was applied to the evaluation of the preservation conditions of the Middle Devonian shale gas in the Youjiang Basin. Information extracted from geologic maps includes exposed stratum, magmatic rock distribution, stratigraphic occurrence and surface fracture distribution. Evaluation criteria for three indexes (stratigraphy index, dip angle index and fracture index) were established to classify the preservation conditions into five types from good to bad. Based on the calculated values of comprehensive index (CI), the comprehensive evaluation each area: 11621.23 km2 for CI of 0.7 - 1.0, 37162.67 km2 for CI of 0.5 - 0.7, 57784.43 km2 for CI of 0.3 - 0.5, 69303.77 km2 for CI of 0.1 - 0.3, and 69303.77 km2 for CI of 0.0 - 0.1, accounting for 3.19%, 10.19%, 15.84%, 18.99% and 51.80% of the whole area, respectively. These results are highly consistent with the actual exploration discoveries, showing that in the northern and central parts of the Guizhong Basin, the southern part of the Xidamingshan Uplift, and the northern part of the Qiannan Basin, there are large areas with good shale gas preservation conditions.

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Geochemical characteristics and sedimentary environment of the Middle Devonian organic-rich shales in the Northwest of Guizhong Depression, Southwest China

Cited by 9 publications

References 0 publications

The Whole-Aperture Pore Structure Characteristics and Their Controlling Factors of the Dawuba Formation Shale in Western Guizhou

The Whole-Aperture Pore Structure Characteristics and Their Controlling Factors of the Dawuba Formation Shale in Western Guizhou

Carboniferous Shale Gas Accumulation Characteristics and Exploration Directions in South China

A novel method for evaluating shale gas preservation conditions in an area on a regional scale

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