Causes and geochemical significance of total organic carbon anomaly in solid residue samples from source rock pyrolysis simulation experiments in a closed system

CANG Hui; CHEN Zhijun; YANG Dong; CHEN Yiguo; HAN Changchun; LI Ziliang; CHEN Lingling

doi:10.11781/sysydz2024061275

Volume 46 Issue 6

Nov. 2024

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Article Navigation > PETROLEUM GEOLOGY & EXPERIMENT > 2024 > 46(6): 1275-1285

CANG Hui, CHEN Zhijun, YANG Dong, CHEN Yiguo, HAN Changchun, LI Ziliang, CHEN Lingling. Causes and geochemical significance of total organic carbon anomaly in solid residue samples from source rock pyrolysis simulation experiments in a closed system[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(6): 1275-1285. doi: 10.11781/sysydz2024061275

Citation:

CANG Hui, CHEN Zhijun, YANG Dong, CHEN Yiguo, HAN Changchun, LI Ziliang, CHEN Lingling. Causes and geochemical significance of total organic carbon anomaly in solid residue samples from source rock pyrolysis simulation experiments in a closed system[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(6): 1275-1285. doi: 10.11781/sysydz2024061275

Citation:

CANG Hui, CHEN Zhijun, YANG Dong, CHEN Yiguo, HAN Changchun, LI Ziliang, CHEN Lingling. Causes and geochemical significance of total organic carbon anomaly in solid residue samples from source rock pyrolysis simulation experiments in a closed system[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(6): 1275-1285. doi: 10.11781/sysydz2024061275

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Causes and geochemical significance of total organic carbon anomaly in solid residue samples from source rock pyrolysis simulation experiments in a closed system

doi: 10.11781/sysydz2024061275

1.
Research Institute of Yanchang Petroleum (Group) Co., Ltd., Xi'an, Shaanxi 710075, China
2.
College of Resources and Environment, Yangtze University, Wuhan, Hubei 430100, China
3.
Downhole Services Company of CNPC Bohai Drilling Engineering Company Limited, Renqiu, Hebei 062552, China

Received Date: 2024-06-09
Rev Recd Date: 2024-09-27
Publish Date: 2024-11-28

Abstract

Abstract

Under natural evolution, the total organic carbon (TOC) content of source rocks typically decreases as maturity increases. However, in later stages of pyrolysis simulation experiments conducted in a closed system, the TOC content of solid residue samples would anomalously increase instead of decreasing. By analyzing data from pyrolysis simulation experiments on lacustrine source rock samples from the Mesozoic Yingen-Ejinaqi Basin, the causes of this TOC content anomaly were investigated, and its geochemical significance was explored. The results suggested that this anomaly was related to secondary cracking of crude oil. In the closed system of the experiments, early-formed crude oil was trapped in the reactor, unable to be discharged. As the temperature increased, large-scale oil cracking occurred, converting it into gaseous hydrocarbons and generating pyrobitumen. The insoluble pyrobitumen adhered to the solid residue samples, resulting in an increase of TOC content. Based on TOC variation curve of solid residue samples from the pyrolysis simulation experiments, a new method was established to determine the main gas generation threshold for oil cracking in different types of source rocks. The significant amount of pyrobitumen generated, accompanied by an increase in TOC content, indicated the onset of large-scale oil cracking and gas generation. This method overcomes the shortcomings of existing methods, such as inevitable human errors in determining the main gas generation threshold and the inability to conduct more in-depth study on mixed-source oils.

Author CHEN Zhijun is a Young Editorial Board Member of this journal, and he did not take part in the peer review or decision-making of this article.
This study was designed by CANG Hui. Sample analysis and data organization were completed by LI Ziliang. Causes of total organic carbon anomaly in solid residue samples from the source rock pyrolysis simulation experiments were studied by CHEN Zhijun. The method for determining the main cracking gas generation threshold of cracking oil in different types of source rocks was established by CANG Hui. The manuscript was drafted and revised by CHEN Zhijun. Figures were drawn by YANG Dong and CHEN Lingling. The manuscript was proofread by CHEN Yiguo and HAN Changchun. All authors have read the last version of the paper and consented to its submission.

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References(47)

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Causes and geochemical significance of total organic carbon anomaly in solid residue samples from source rock pyrolysis simulation experiments in a closed system

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Causes and geochemical significance of total organic carbon anomaly in solid residue samples from source rock pyrolysis simulation experiments in a closed system

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