Oil pyrolysis with carbonate minerals: Implications for the thermal stability of deep crude oil

Maimaiti, Aizimaiti; Wang, Qi; Hao, Fang; Yang, Xianzhang; Zhang, Haizu; Tian, Jinqiang

doi:10.1016/j.marpetgeo.2022.105929

Cited by 8 publications

(2 citation statements)

References 77 publications

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“…For example, abundant potassium ions in saltwater environments accelerate smectite illitization, resulting in earlier hydrocarbon generation . In some cases, mineral protection may also inhibit the cracking of liquid hydrocarbons, extending the maximum depth of oil preservation. , Therefore, oil and gas exploration can not only consider the role of temperature but also consider the influence of the subsurface chemical environment.…”

Section: Discussionmentioning

confidence: 99%

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Multistage Hydrocarbon Generation of Saline Lacustrine Source Rocks in Hydrous Pyrolysis: Insights from Clay Mineral–Organic Matter Interactions

Cai

et al. 2023

ACS Omega

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The organic matter (OM) in shale is closely associated with clay minerals, and its maturation is usually accompanied by the diagenesis of these minerals, especially smectite illitization. However, the effect of mineral transformation and its accompanying change of mineral–OM interactions in shale on hydrocarbon generation is still unclear. To investigate this question, smectite-rich immature shale was selected to carry out hydrous pyrolysis. Organic geochemistry and mineralogy of pyrolysates at different temperatures show that the maturation of OM is accompanied by the transformation of bulk and clay minerals. Based on the change in hydrocarbon yield, Rock-Eval parameters, and mineral composition, hydrocarbon generation in this study is divided into three stages: 25–300, 300–400, and 400–500 °C, which are the result of the synergistic evolution of clay minerals and OM. Multistage hydrocarbon generation can be attributed to the mineral transformation-induced desorption of mineral-bound soluble OM (SOM), decarboxylation and hydrocracking of kerogen promoted by solid acids, and cross-linking and cracking reactions of free SOM and residual kerogen under high temperatures. Although different from the classical hydrocarbon generation model of kerogen, this multistage hydrocarbon generation is consistent with the characteristics of the saline lacustrine source rocks in nature. The mineral transformation-induced desorption of SOM is a new pathway for petroleum formation, which can well explain the formation of low-mature oils in nature. In addition, the release of mineral-bound and kerogen-bound biomarkers results in two reversals of isomerization ratios. Considering mineral transformation and mineral–OM interactions can help us better understand and refine the hydrocarbon generation theory of OM.

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Section: Discussionmentioning

confidence: 99%

“… 95 In some cases, mineral protection may also inhibit the cracking of liquid hydrocarbons, extending the maximum depth of oil preservation. 96 , 97 Therefore, oil and gas exploration can not only consider the role of temperature but also consider the influence of the subsurface chemical environment.…”

Section: Discussionmentioning

confidence: 99%

Multistage Hydrocarbon Generation of Saline Lacustrine Source Rocks in Hydrous Pyrolysis: Insights from Clay Mineral–Organic Matter Interactions

Cai

et al. 2023

ACS Omega

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Effects of the combined use of kaolinite and dolomite as catalysts for the heavy oil oxidation

Dai,

Zhang,

et al. 2024

Applied Clay Science

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Crude oil cracking under geological conditions: A case study of the Ediacaran reservoir, central Sichuan Basin, China

Li,

Liu,

Song

et al. 2024

Fuel

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Oil pyrolysis with carbonate minerals: Implications for the thermal stability of deep crude oil

Cited by 8 publications

References 77 publications

Multistage Hydrocarbon Generation of Saline Lacustrine Source Rocks in Hydrous Pyrolysis: Insights from Clay Mineral–Organic Matter Interactions

Multistage Hydrocarbon Generation of Saline Lacustrine Source Rocks in Hydrous Pyrolysis: Insights from Clay Mineral–Organic Matter Interactions

Effects of the combined use of kaolinite and dolomite as catalysts for the heavy oil oxidation

Crude oil cracking under geological conditions: A case study of the Ediacaran reservoir, central Sichuan Basin, China

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