Investigation of Organic Matter Sources and Depositional Environment Changes for Terrestrial Shale Succession from the Yuka Depression: Implications from Organic Geochemistry and Petrological Analyses

Shiming Liu; Lian Jiang; Bangjun Liu; Cunliang Zhao; Shuheng Tang; Furong Tan

doi:10.1007/s12583-022-1617-1

Volume 34 Issue 5

Oct 2023

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Journal of Earth Science > 2023 > 34(5): 1577-1595.

Shiming Liu, Lian Jiang, Bangjun Liu, Cunliang Zhao, Shuheng Tang, Furong Tan. Investigation of Organic Matter Sources and Depositional Environment Changes for Terrestrial Shale Succession from the Yuka Depression: Implications from Organic Geochemistry and Petrological Analyses. Journal of Earth Science, 2023, 34(5): 1577-1595. doi: 10.1007/s12583-022-1617-1

Citation:

Shiming Liu, Lian Jiang, Bangjun Liu, Cunliang Zhao, Shuheng Tang, Furong Tan. Investigation of Organic Matter Sources and Depositional Environment Changes for Terrestrial Shale Succession from the Yuka Depression: Implications from Organic Geochemistry and Petrological Analyses. Journal of Earth Science, 2023, 34(5): 1577-1595. doi: 10.1007/s12583-022-1617-1

Citation:

Shiming Liu, Lian Jiang, Bangjun Liu, Cunliang Zhao, Shuheng Tang, Furong Tan. Investigation of Organic Matter Sources and Depositional Environment Changes for Terrestrial Shale Succession from the Yuka Depression: Implications from Organic Geochemistry and Petrological Analyses. Journal of Earth Science, 2023, 34(5): 1577-1595. doi: 10.1007/s12583-022-1617-1

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Investigation of Organic Matter Sources and Depositional Environment Changes for Terrestrial Shale Succession from the Yuka Depression: Implications from Organic Geochemistry and Petrological Analyses

doi: 10.1007/s12583-022-1617-1

1.
Key Laboratory of Resource Exploration Research of Hebei Province, Hebei University of Engineering, Handan 056038, China
2.
Department of Earth and Environmental Sciences and MQ Marine Research Centre, Macquarie University, Sydney NSW 2109, Australia
3.
School of Energy Resource, China University of Geosciences, Beijing 100083, China
4.
Department of Geology, Northwest University, Xi' an 710069, China

More Information

Corresponding author: Bangjun Liu, liubangjun@hebeu.edu.cn
Received Date: 01 Nov 2021
Accepted Date: 15 Jan 2022

Available Online: 14 Oct 2023

Issue Publish Date: 30 Oct 2023

Abstract

Abstract

Continental organic-rich shales are well developed in the Dameigou Formation within the Yuka Depression of the Qaidam Basin. Here, the Rock-Eval pyrolysis, biomarkers, organic petrology, and stable carbon isotope have been carried out on the Middle Jurassic Dameigou Formation source rocks from the northwest part of Yuka Depression, Qaidam Basin in order to study their thermal maturity, source of organic matter (OM), and palaeoenvironment changes. The Rock-Eval pyrolysis data (e.g., T_max), vitrinite reflectance, and biomarker-derived thermal maturity parameters (e.g., carbon preference index, Ts/(Ts+Tm), C₂₉ Ts/(C₂₉Ts+C₂₉ αβ hopane), C₃₀ αβ/(αβ+βα) hopanes, C₂₉ ααα 20S/(20S+20R) steranes, and C₂₉ αββ/ (αββ+ααα) steranes) suggest all studied samples stay between immature and low mature stage. The maceral compositions, stable carbon isotope compositions, n-alkane distributions, and biomarker-derived source parameters (e.g., C₂₇/C₂₉ ααα 20R sterane, ternary diagram of C₂₇-C₂₈-C₂₉ steranes, C₂₄ tetracyclic terpane) indicate both aquatic organisms and higher plants are the source of OM in the shales, but land plants are dominant. Generally low gammacerane concentration and environment-related parameters (e.g., cross-plots of C₂₇/C₂₉ ααα 20R sterane vs. Pr/Ph) indicate these source rocks may be derived from lacustrine and fluvial-deltaic environments with fresh water, which is also supported by the variations of stable carbon isotopes from OM in the source rocks. However, the stable carbon isotope compositions of OM in the source rocks were influenced by multiple factors (e.g., source types and depositional environment) in the Yuka Depression. Slightly brackish condition is recorded in the upper part of the ZK6-1 well favor the formation of lacustrine algae, as confirmed by high contents of C₂₇ steranes and short-chain n-alkanes. The variation of reducing to oxidizing condition of study area is possibly associated with the periodical flooded river-influenced aquatic condition during the deposition of the Middle Jurassic Dameigou Formation.
- biomarker,
- stable carbon isotopes,
- dameigou formation,
- lacustrine sediments,
- paleoenvironment,
- petroleum geology

The authors declare that they have no conflict of interest.

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