What does this research mean for the field?

In marine-continental transitional source rocks, preservation conditions such as water stratification and rapid sedimentation can outweigh material input in determining organic matter enrichment, challenging the assumption that terrestrial input is the primary factor. Novelty: ClaimNovelty.CONTRADICTORY. Consensus alignment: ConsensusAlignment.CHALLENGES_CONSENSUS.

What question did this study set out to answer?

To determine how multi-source organic inputs and dynamic sedimentary environmental factors interact to govern organic matter enrichment and preservation in marine-continental transitional source rocks.

September 14, 2026Geological Journal

Coupling Effect Between Multi‐Source Supply and Sedimentary Environment Factors on Organic Matter Enrichment: A Case Study of Marine‐Continental Transitional Source Rock, Xihu Sag

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Authors

XLXingyu LiMinzu University of China ZJZaixing JiangChina University of Geosciences (Beijing)JWJunhui WangChina University of Petroleum, Beijing

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Implication

Geological analysis reveals that preservation conditions outweigh multi-source material supply in transitional source rocks, highlighting key mechanisms driving organic matter enrichment.

Key Points

To determine how multi-source organic inputs and dynamic sedimentary environmental factors interact to govern organic matter enrichment and preservation in marine-continental transitional source rocks.
Evaluated Eocene lower Pinghu Formation coal-measure source rocks from the Bao-Wu area within the Xihu Sag, East China Sea Basin.
Integrated organic geochemistry, elemental geochemistry, core descriptions, and seismic interpretation, comparing profiles between Well NB19-6-6D and Well NB19-6-2.
Identified mixed organic matter sources driven by hydrothermal, terrestrial, bacterial, and planktonic inputs.
Demonstrated that peak organic matter enrichment occurs under moderate terrestrial supply coupled with increased planktonic and bacterial growth, stable water stratification, rapid sedimentation, and restricted basin connectivity.
Showed that Well NB19-6-6D attained higher organic matter content than Well NB19-6-2 despite being located in a less favorable sedimentary facies, confirming that preservation mechanisms can override total material input.

Cite This Study

Li et al. (2026) studied this question.

synapsesocial.com/papers/6aa7dfc60926e14a848b3e89 https://doi.org/10.1002/gj.70482

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Implication

Geological analysis reveals that preservation conditions outweigh multi-source material supply in transitional source rocks, highlighting key mechanisms driving organic matter enrichment.

Coupling Effect Between Multi‐Source Supply and Sedimentary Environment Factors on Organic Matter Enrichment: A Case Study of Marine‐Continental Transitional Source Rock, Xihu Sag

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Implication

Key Points

Cite This Study

Coupling Effect Between Multi‐Source Supply and Sedimentary Environment Factors on Organic Matter Enrichment: A Case Study of Marine‐Continental Transitional Source Rock, Xihu Sag

Discussion

Member takes

Implication

Key Points

Cite This Study

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