Palaeoenvironment evolution and organic matter enrichment mechanisms of the Wufeng-Longmaxi shales of Yuanán block in western Hubei, middle Yangtze: Implications for shale gas accumulation potential

Xu, Lulu; Huang, Saipeng; Wang, Yan; Zhou, Xianghui; Liu, Zaoxue; Wen, Yaru; Zhang, Yanlin; Sun, Mengdi

doi:10.1016/j.marpetgeo.2023.106242

Cited by 8 publications

(11 citation statements)

References 92 publications

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“…The Yangtze Platform and the Cathaysia Block constitute the South China Plate. , The Yangtze platform was covered by the extensive epicontinental sea (Yangtze Sea) at the end of the Ordovician and bordered by the China Sea in the southeast, and the China Sea may be connected to the world ocean . The Yangtze Sea is divided by the Jiujiang Strait into the Upper Yangtze Sea in the west and the Lower Yangtze Sea in the east (Figure B) . From Late Ordovician to Early Silurian, under the effect of Caledonian movement, the Upper Yangtze plate was squeezed, and many uplifts around the Yangtze plate began to rise, such as the central Sichuan uplift in the northwest, the ancient Yunnan-Guizhou land in the south (Qianzhong uplift), and the Xuefeng uplift in the southeast (Figure B) .…”

Section: Geologic Settingmentioning

confidence: 99%

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Constraints of Sedimentary Environment on Shale Organic Matter Enrichment: Insights from Elemental Geochemistry and Multiple Factor Analysis

Shao,

Xu,

Jiang

et al. 2024

ACS Omega

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The organic-rich shale of the Wufeng−Longmaxi formation is an important section for shale gas exploration. The traditional univariate or bivariate analysis causes researchers to have great controversy about its enrichment mechanism. This study explores the combination of multiple factor analysis (MFA) and element geochemistry to calculate the contribution rate of a paleoenvironment to organic matter enrichment and clarify the main controlling factors of organic matter enrichment. Research has shown that there is generally high productivity from the Wufeng (O 3 w)−Longmaxi formation (S 1 l) deposition. The degree of terrigenous clastic input and weathering during the period of the O 3 w is relatively low, and sedimentary water restriction is strong, mainly developing an anoxic−dysoxic sedimentary environment. During the deposition of S 1 l 1 , the input intensity and weathering of terrigenous debris were slightly enhanced, and the increase of the water column led to the development of an anoxic environment at the bottom of the water layer. During the S 1 l 2+3 period, the degree of terrigenous debris and weathering is the largest, and the high oxygen content of the water column is mainly a normal oxic environment. An MFA calculation shows that the paleoproductivity and paleoredox environment of the organic-rich shale section have the highest contribution rate of about 59.57% to the enrichment of organic matter, which is higher than that of paleoclimate conditions and terrigenous clastic input, indicating that the enrichment of organic matter is mainly controlled by paleoproductivity and the preservation environment. This study provides a basis for the application of MFA in element geochemistry and can serve as a model for other studies.

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Section: Geologic Settingmentioning

confidence: 99%

“…453−445 Ma) 26. (B) Late Ordovician-Early Silurian paleogeographic map of the Yangtze region 30. (C) Plane distribution map of shale thickness in the Upper Ordovician Wufeng formation−Lower Silurian Longmaxi formation in the Upper Yangtze area 33.…”

mentioning

confidence: 99%

Constraints of Sedimentary Environment on Shale Organic Matter Enrichment: Insights from Elemental Geochemistry and Multiple Factor Analysis

Shao,

Xu,

Jiang

et al. 2024

ACS Omega

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“…Chen & Wan, 1999;Fu et al, 2018). The palaeoclimate index (C) is also an effective indicator for studying palaeo-climate and is defined as the ratio of the elements that prefer a humid climate to a dry climate, with high and low values corresponding to warm-humid and cold-dry climates, respectively (L. L. Xu et al, 2023). The calculation formula for C is as follows (L. L. Xu et al, 2023).…”

Section: Palaeo-climatementioning

confidence: 99%

“…Determining the redox conditions of sedimentary environments is crucial for understanding the preservation of organic matter, which in turn impacts the development of source rocks (Fu et al, 2018;L. L. Xu et al, 2023).…”

Section: Palaeo-redox Conditionsmentioning

confidence: 99%

“…The changes in palaeoenvironment not only regulate the sedimentation process by influencing rainfall, palaeo-water depth, sediment transport, and other factors, but also determine the types and quantities of biological communities, ultimately influencing the accumulation and distribution of organic matter (Burdige, 2007;Salduondo et al, 2022;Spychala et al, 2020; L. L. Xu et al, 2023). Therefore, reconstructing palaeoenvironments is crucial for a better understanding of the formation and evolution of sediments, and can provide an essential scientific basis for oil and gas resource exploration.…”

Section: Introductionmentioning

confidence: 99%

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Analysing of palaeoenvironment and organic matter enrichment: A case study from the Triassic Yanchang Formation in the southern Ordos Basin, China

Yang,

Li,

et al. 2023

Geological Journal

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The organic‐rich shale of the seventh Oil Member (Chang 7 Member for short) of the Middle‐Late Triassic Yanchang Formation is extensively distributed in the southern margin of the Ordos Basin. Understanding the palaeoenvironmental conditions during the sedimentary period of the Chang 7 Member is crucial to exploring the main factors that control the enrichment of organic matter in high‐quality source rocks. In this study, lithofacies analysis was conducted, and samples were collected from the N36 well located in the southern part of the Ordos Basin. Subsequently, element geochemical analysis was performed to reconstruct the palaeoenvironment, and total organic carbon (TOC) tests were conducted to analyse the characteristics of organic matter enrichment. The findings indicate that the sedimentary period of the Chang 7 Member was characterized by a relatively warm and humid palaeo‐climate and a brackish water environment with oxygen‐poor or sub‐oxygen‐rich conditions, and a gradual decrease in palaeo‐water depth. The parent rock types were mainly felsic igneous rock and intermediate igneous rock, which provide limited nutritional elements for primary producers. The enrichment of organic matter in the Chang 7 Member is influenced by several factors, mainly including palaeo‐salinity, palaeo‐water depth, palaeo‐redox conditions, terrestrial inputs, and palaeo‐climate. The warm and humid palaeo‐climate, higher palaeo‐productivity, relatively higher palaeo‐salinity, lower terrigenous input, deeper palaeo‐water depth, and better preservation conditions are conducive to the development of high‐quality source rock in the Chang 7 Member.

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Provenance history, depositional conditions andtectonic settings during late Cenomanian – early Turonian time in the Gongola Sub-Basin of the Upper Benue Trough Nigeria: Evidence from major and trace elements geochemistry of the Kanawa shales from the Pindiga Formation

Abubakar,

Hohl,

Usman

et al. 2024

Journal of African Earth Sciences

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Palaeoenvironment evolution and organic matter enrichment mechanisms of the Wufeng-Longmaxi shales of Yuanán block in western Hubei, middle Yangtze: Implications for shale gas accumulation potential

Cited by 8 publications

References 92 publications

Constraints of Sedimentary Environment on Shale Organic Matter Enrichment: Insights from Elemental Geochemistry and Multiple Factor Analysis

Constraints of Sedimentary Environment on Shale Organic Matter Enrichment: Insights from Elemental Geochemistry and Multiple Factor Analysis

Analysing of palaeoenvironment and organic matter enrichment: A case study from the Triassic Yanchang Formation in the southern Ordos Basin, China

Provenance history, depositional conditions andtectonic settings during late Cenomanian – early Turonian time in the Gongola Sub-Basin of the Upper Benue Trough Nigeria: Evidence from major and trace elements geochemistry of the Kanawa shales from the Pindiga Formation

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