Volume 32 Issue 1
Feb.  2026
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Article Navigation >  Journal of Geomechanics  > 2026  >  32(1): 15-30
TANG S，WANG X F，CHEN A Q，et al.，2026. The marine environment and organic matter enrichment model of the intracontinental Upper Yangtze Craton during the Middle Triassic[J]. Journal of Geomechanics，32（1）：15−30 doi: 10.12090/j.issn.1006-6616.2025055
Citation: TANG S，WANG X F，CHEN A Q，et al.，2026. The marine environment and organic matter enrichment model of the intracontinental Upper Yangtze Craton during the Middle Triassic[J]. Journal of Geomechanics，32（1）：15−30 doi: 10.12090/j.issn.1006-6616.2025055
shu

The marine environment and organic matter enrichment model of the intracontinental Upper Yangtze Craton during the Middle Triassic

doi: 10.12090/j.issn.1006-6616.2025055
  • 1.

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

  • 2.

    Central Sichuan Oil and Gas District, PetroChina Southwest Oil & Gas Field Company, Suining 629018, Sichuan, China

  • 3.

    Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China

Funds:  This research was financially supported by the National Natural Science Foundation of China (Grant No. U24A20591) and the Innovative Group Project of Sichuan Science and Technology Program (Grant No. 2023NSFSC1986).
More Information
  • Received: 2025-05-21
  • Revised: 2026-01-09
  • Accepted: 2026-01-09
    • Available Online: 2026-01-13
  • Published: 2026-02-27
    Abstract
  •   Objective  The exploration of marlstone reservoirs represents a current frontier for expanding oil and gas resources. The recent discovery of unconventional marine oil and gas in the Lei 3-2 sub-member of the Middle Triassic Leikoupo Formation in Well CT-1 reveals a new prospective area. However, the organic matter enrichment mechanisms and exploration potential of this sub-salt lagoon marlstone remain unclear, hindering further exploration.   Methods  This study, focusing on Well CT-1 in the central Sichuan Basin, investigates the organic matter enrichment mechanism through rock mineralogy and paleo-oceanographic geochemical proxies. This study also characterizes the reservoir properties and distribution via reservoir characterization and sedimentary facies analysis to evaluate its potential.   Results  The marlstone was deposited in an anoxic, deep-water lagoon of a carbonate platform with high paleo-productivity. The enrichment of organic matter, with an average total organic carbon (TOC) content of 1.16% (reaching up to 1.78%), was co-controlled by these reducing conditions and high productivity. Analyses (CT and SEM) of the high-quality "sweet spot" intervals show that the storage space is predominantly composed of nano- to micro-scale pores and microfractures, with porosity exceeding 3%. The reservoir developed in a deep-water, marlstone- and gypsum-rich lagoon within an epicontinental sea carbonate platform.   Conclusion  The widespread distribution of deep-water lagoons during the deposition of the Lei 3-2 sub-member is associated with a maximum flooding event. Concurrently, the prevailing monsoon climate significantly enhanced weathering and nutrient input, while the overlying regressive evaporites provided a seal for long-term and efficient organic matter preservation. [Significance] Comprehensive analysis suggests that the extensively distributed, organic-rich deep-water lagoon marlstone formed during this transgression in the intracontinental sag of the Upper Yangtze Craton is not only a viable unconventional exploration target but also likely acts as a hydrocarbon source for conventional reservoirs within the Leikoupo Formation.

     

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