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June 27, 2026EnergiesOpen Access

Origin, Charging History, and Migration–Accumulation Patterns of Crude Oils in the Eocene Dainan Formation, Southeastern Gaoyou Sag, Subei Basin

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Authors

JZJuan ZhangWLWenting LiaoLFLixin Fan

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Overview

Randomized trial examines hydrocarbon origins and migration patterns in a deep basin, suggesting implications for exploration.

Key Points

  • This research aims to determine the origin, charging history, and migration patterns of crude oils found in the Eocene Dainan Formation.
  • Integrated analysis of biomarker and light-hydrocarbon geochemistry, fluid-inclusion microthermometry, and migration modelling was performed.
  • Twenty analytical entries from Dainan oils/reservoir samples and Funing Formation source-rock extracts were analyzed.
  • Two accumulation styles were identified through integrated migration modelling.
  • Mixed contributions from the E1f2 and E1f4 source intervals were established, indicating a multi-source origin.
  • Most oils were placed within the early- to main-oil window, supported by maturity parameters.
  • Two migration systems were identified: a northern fault-slope and a southern fault-conduit system, enhancing understanding of hydrocarbon accumulation.

Cite This Study

Zhang et al. (2026) studied this question.

synapsesocial.com/papers/6a3f6817aea7db3c1953f4eehttps://doi.org/10.3390/en19132990
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