Volume 32 Issue 1
Feb.  2026
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Article Navigation >  Journal of Geomechanics  > 2026  >  32(1): 107-123
LU M，DUAN G Q，Zhang T X，et al.，2026. Impact of middle to late Triassic climate change on organic matter enrichment in hydrocarbon source rocks of the Chang 7 Member, Yanchang Formation, southeastern Ordos Basin[J]. Journal of Geomechanics，32（1）：107−123 doi: 10.12090/j.issn.1006-6616.2025139
Citation: LU M，DUAN G Q，Zhang T X，et al.，2026. Impact of middle to late Triassic climate change on organic matter enrichment in hydrocarbon source rocks of the Chang 7 Member, Yanchang Formation, southeastern Ordos Basin[J]. Journal of Geomechanics，32（1）：107−123 doi: 10.12090/j.issn.1006-6616.2025139
shu

Impact of middle to late Triassic climate change on organic matter enrichment in hydrocarbon source rocks of the Chang 7 Member, Yanchang Formation, southeastern Ordos Basin

doi: 10.12090/j.issn.1006-6616.2025139
  • 1.

    Hainan Institute, China University of Petroleum (Beijing), Sanya 572025, Hainan, China

  • 2.

    College of Geoscience, China University of Petroleum (Beijing), Beijing 102249, China

Funds:  This research was financially supported by the National Natural Science Foundation of China (Grant No. 42402137) and the Science Foundation of China University of Petroleum, Beijing (Grant No. 2462024BJRC006).
More Information
  • Received: 2025-09-22
  • Revised: 2026-01-08
  • Accepted: 2026-01-12
    • Available Online: 2026-01-16
  • Published: 2026-02-27
    Abstract
  •   Objective  The middle to late Triassic was a period of critical climatic transition in Earth's history. Multiple global humid climate events during this time profoundly impacted both marine and terrestrial depositional environments, facilitating the development of marine and continental source rocks.   Methods  This study focuses on the hydrocarbon source rocks of the seventh member of the Yanchang Formation (Chang 7 Member) in the southeastern Ordos Basin. Based on integrated elemental geochemical and molecular organic geochemical analyses, this study explores the relationship between middle to late Triassic humid climatic events and organic matter enrichment in lacustrine settings.   Results  The lower to middle interval of Submember 3 of Chang 7 Member (695–660 m in depth) is characterized by high total organic carbon content and good hydrocarbon generation potential. Chemical weathering indices indicate that this interval was deposited underwarmer and more humid climatic conditions, while the overlying upper portion of Submember 3 and Submembers 2 and 1 were deposited under cooler and drier conditions. By combining global characteristics of middle to late Triassic humid events with palynostratigraphy, zircon U–Pb geochronology, and carbon isotope stratigraphy, this study links the lower to middle interval of the Submember 3 and the middle to late Triassic Ladinian–Carnian humid climate event.  Conclusions  The findings suggest that, under the influence of humid climate events, enhanced terrestrial nutrient influxes stimulated primary productivity in the lake. Concurrently, intensified water column stratification and bottom-water anoxia created favorable conditions for organic matter preservation, leading to the deposition of high-quality source rocks. Following the event, the climate shifted towards colder and drier conditions. This reduced terrestrial input, decreased primary lake productivity, lowered oxygen depletion in the water, and led to less favorable conditions for organic matter preservation and enrichment. [ Significance] This study not only provides new evidence for paleoclimatic and paleoenvironmental reconstruction during the middle to late Triassic but also offers an important reference for understanding organic matter enrichment mechanisms during major climatic transitions in Earth’s history.

     

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