Temperature and pressure determine whether hydrocarbons form petroleum or natural gas
Geological and geochemical studies consistently demonstrate that subsurface temperature and pressure are primary thermodynamic factors determining the maturation of organic matter and whether hydrocarbons evolve into petroleum or natural gas.
The retrieved papers provide extensive experimental and modeling evidence showing that temperature and pressure (alongside kerogen type and heating kinetics) directly control the thermal maturation stages of organic matter, dictating the transition from primary oil generation to secondary gas cracking. Therefore, the claim is strongly supported by the literature.
Onishenko Y, Tajik A, Vakhin A, Dengaev A, Oscar FK, Sitnov S, Duglav Y, Ismaeel M, Mirzaev O, Aliev F. Hydrothermal Transformation of Organic Matter in the Case of Domanik Shale Deposits.. 2026. https://doi.org/10.3390/molecules31081239
The study demonstrates that temperature conditions directly govern kerogen maturation, bitumoid yield, and secondary cracking into lighter hydrocarbons and gas.
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Wang H, Li J, Zhou S, Wu T, Fu D, Wang X, Wu Y. Unraveling the Two-Stage Phase Evolution Mechanism of Deep Lacustrine Type I Kerogen: Integrated Insights from Pyrolysis Kinetics, Isotopic Fingerprinting, and PVT Modeling.. 2026. https://doi.org/10.1021/acsomega.5c12431
The research highlights how deep temperature and pressure conditions dictate the two-stage evolution from oil generation to secondary oil cracking into gas.
Hakimi MH, Kumar A, Lashin A, Abass AM, Mustapha KA, Mathews RP, Nurgaliev DK, Talha Qadri SM, Singh PK. Molecular structure and thermal decomposition kinetics of kerogen from the Paleocene oil-shale facies in the Bikaner-Nagaur Basin, western India.. 2026. https://doi.org/10.1038/s41598-026-40152-y
The findings show that subsurface temperature regimes dictate the thermal decomposition and release of specific petroleum types from kerogen.
Jinmei B, Kun Q, Xiaojun W, Xiangji D, Yanfeng H. Thermal cracking for upgrading medium-low maturity shale oil: evolution of organic matter occurrence.. 2025. https://doi.org/10.1038/s41598-025-27082-x
The simulation experiments establish that thermal cracking temperature directly controls the degradation rate and the transformation sequence of heavy hydrocarbons into lighter products.
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