Geological controls of shale gas accumulation and enrichment mechanism in Lower Cambrian Niutitang Formation of western Hubei, Middle Yangtze, China

Xu, Lulu; Huang, Saipeng; Liu, Zaoxue; Wen, Yaru; Zhou, Xianghui; Zhang, Yanlin; Xiongwei, Li; Deng, Wang; Luo, Fan; Chen, Cheng

doi:10.1007/s11707-021-0892-y

Cited by 6 publications

(12 citation statements)

References 41 publications

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“…The study area in western Hubei belongs to the middle Yangtze Block, which is located in the north central of the Yangtze Block and is close to the Sichuan Basin of upper Yangtze in the west, the oldland in the east, the Qinling Ocean in the north bounded by the Xiangguang fault, and the Nanhua Ocean in the south ( Figure 1 a,b). 7 , 29 The sedimentary facies from west to the east of ϵ 1 n 1 developed successively from shallow shelf, deep shelf, shallow shelf, and oldland in central Hubei, and the black shale of ϵ 1 n is mainly deposited in the deep shelf east of Chongqing and west of Yichang city ( Figure 1 b). 7 …”

Section: Geological Settingmentioning

confidence: 99%

“… 7 , 29 The sedimentary facies from west to the east of ϵ 1 n 1 developed successively from shallow shelf, deep shelf, shallow shelf, and oldland in central Hubei, and the black shale of ϵ 1 n is mainly deposited in the deep shelf east of Chongqing and west of Yichang city ( Figure 1 b). 7 …”

Section: Geological Settingmentioning

confidence: 99%

“…During that period, with the extensive and rapid transgression, the Yangtze block changed from a carbonate platform to a shallow and deep shelf environment and then the ϵ 1 n was deposited widely with a series of black siliceous carbonaceous shale, calcareous shale, silty shale, and limestone. The study area in western Hubei belongs to the middle Yangtze Block, which is located in the north central of the Yangtze Block and is close to the Sichuan Basin of upper Yangtze in the west, the oldland in the east, the Qinling Ocean in the north bounded by the Xiangguang fault, and the Nanhua Ocean in the south (Figure a,b). , The sedimentary facies from west to the east of ϵ 1 n 1 developed successively from shallow shelf, deep shelf, shallow shelf, and oldland in central Hubei, and the black shale of ϵ 1 n is mainly deposited in the deep shelf east of Chongqing and west of Yichang city (Figure b) …”

Section: Geological Settingmentioning

confidence: 99%

“…4 , 5 Exploration practice has shown that the ORS of ϵ 1 n 1 formed in a deep shelf with a high total organic carbon (TOC) value and a large shale thickness, and is the main shale gas exploration target layer. 6 , 7 …”

Section: Introductionmentioning

confidence: 99%

“…The lower cambrian Niutitang formation (ϵ 1 n ) is one of the most promising marine shale gas reservoirs and has been widely developed in the Yangtze block. − It is widely accepted that ϵ 1 n can be divided into two sections, and organic-rich shale (ORS) is mainly developed in the first section (ϵ 1 n 1 ). , Exploration practice has shown that the ORS of ϵ 1 n 1 formed in a deep shelf with a high total organic carbon (TOC) value and a large shale thickness, and is the main shale gas exploration target layer. , …”

Section: Introductionmentioning

confidence: 99%

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Paleoenvironment Evolutionary Characteristics of Niutitang Shale in Western Hubei, Middle Yangtze, China

Huang

Liu

et al. 2022

ACS Omega

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The black shale developed in the first section of the Niutitang formation (ϵ 1 n 1 ) is one of the most important shale gas reservoirs in western Hubei, and its geological characteristics have been sufficiently studied by many predecessors. However, there are still three aspects that need further research: the origin of silicon, the discrimination of the euxinic sulfuretted and the anoxic ferruginous conditions, and the main controlling factors of organic matter enrichment. Based on geochemical data from well ZD1 located in the city of Yichang in western Hubei, first, the geochemical characteristics of ϵ 1 n 1 are analyzed, then the provenance, depositional site, and paleoenvironment evolution are discussed, and finally, the main controlling factor of organic matter enrichment is revealed. The results show that ϵ 1 n 1 can be divided into two units, organic-rich shales (ORS) and organic-lean shales (OLS), which have average total organic carbon contents of 4.21 and 0.84%, respectively. Additionally, the ORS is characterized by high contents of SiO 2 , U, V, Ni, Zn, and Cu and left-inclining types of rare earth element distribution curves. ϵ 1 n 1 is located in a passive continental margin with a material source mainly from mixed felsic and mafic rocks. Compared with the OLS, the content of biological quartz is much greater, and the terrigenous input is less in the ORS. The paleoclimate is cold and humid with low salinity in the ORS, whereas it is hot and dry with high salinity in the OLS. ϵ 1 n 1 is deposited in a semistagnant basin, and the ORS shows a relatively lower stagnant degree with euxinic to anoxic conditions and moderate to high paleoproductivity, while the OLS shows a high stagnant degree with suboxic to oxic conditions and lower paleoproductivity. The redox conditions are the main controlling factors affecting organic matter enrichment. The environmental evolution model with three stages shows that there is a good causal relationship between redox conditions, paleoproductivity, and sea level fluctuation. The black carbonaceous siliceous in the lower part of the ORS with a thickness of approximately 40 m is the most favorable layer, which will provide a theoretical basis for further shale gas exploration of ϵ 1 n 1 in the western Hubei.

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Paleoenvironment Evolutionary Characteristics of Niutitang Shale in Western Hubei, Middle Yangtze, China

Huang

Liu

et al. 2022

ACS Omega

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Geologic characterization of the Lower Paleozoic black shale of the Niutitang Formation: Implications for a shale gas potential in western Hunan, China

Awan,

Liu,

Yasin

et al. 2024

Marine and Petroleum Geology

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Origin of Authigenic Quartz in Organic-Rich Shales of the Dalong Formation (NW Middle Yangtze Basin), South China: Implications for Pore Network Development

Liu,

Zhu,

Qiao

et al. 2024

Energy Fuels

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To investigate the origin of quartz and its effect on shale reservoirs in the Dalong Formation, we conducted a thorough analysis of shale samples using various techniques including optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), low-temperature N 2 adsorption, and geochemical analysis. Our findings reveal the presence of different types of quartz in the Dalong Formation shale, namely, detrital quartz, siliceous biogenic quartz, and quartz resulting from the transformation of clay minerals (S−I quartz). The geochemical data show that the contents of TiO 2 and Al 2 O 3 in shale are low, with SiO 2 showing a negative correlation with those of TiO 2 and Al 2 O 3 . The average value of Al/(Al + Fe + Mn) was determined to be 0.66, while the average value of δ 30 Si was 0.68‰. The results indicate that the silica in the Dalong Formation shale was mainly derived from biogenic sources and was not influenced by a hot liquid. The contribution of terrestrial silica is minimal. The content of silica from different sources was quantified, with an average of 71.37% biogenic quartz, 20.22% terrigenous detrital quartz, and 8.40% S−I quartz. By investigating the pore loss mechanism and analyzing N 2 adsorption data, we discovered that biogenic quartz and S−I quartz have a significant impact on pore development in shale. Biogenic quartz acts as a rigid particle, resisting shale compaction and facilitating pore preservation. On the other hand, S−I quartz, which forms through the transformation of clay minerals, promotes further rock compaction and acts as cement, inhibiting pore development. The presence of terrestrial detrital quartz hinders the formation of mesopores in the shale.

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Geological controls of shale gas accumulation and enrichment mechanism in Lower Cambrian Niutitang Formation of western Hubei, Middle Yangtze, China

Cited by 6 publications

References 41 publications

Paleoenvironment Evolutionary Characteristics of Niutitang Shale in Western Hubei, Middle Yangtze, China

Paleoenvironment Evolutionary Characteristics of Niutitang Shale in Western Hubei, Middle Yangtze, China

Geologic characterization of the Lower Paleozoic black shale of the Niutitang Formation: Implications for a shale gas potential in western Hunan, China

Origin of Authigenic Quartz in Organic-Rich Shales of the Dalong Formation (NW Middle Yangtze Basin), South China: Implications for Pore Network Development

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