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| Relationships between Organic Structure Carbonization and Organic Pore Destruction at the Overmatured Stage: Implications for the Fate of Organic Pores in Marine Shales | |
| Song, Dongjun1,2,3; Wu, Chenjun4; Tuo, Jincai5 | |
| 2022-07-07 | |
| Source Publication | ENERGY & FUELS
 |
| ISSN | 0887-0624 |
| Volume | 36Issue:13Pages:6906-6921 |
| Abstract | ABSTRACT: To reveal the relationships between kerogen structure variations and the evolution of organic pore (OP) characteristics in overmatured shales, we transform infrared spectroscopy, gas (N2 and CO2) adsorption tests, and fieldemission scanning electron microscopy on a high-maturity Silurian shale from South China, alongside its solid residues (kerogen) produced from semi-closed pyrolysis. The results showed that the TOC value of solid residues increased significantly during heating, and the chemical structure of organic matter (OM) in kerogen samples abruptly changed at 500 degrees C (3.49% Rmc), which is interpreted as recording intense carbonization of OM. These variations in the OM structure lead to reductions in the pore volume and specific surface area of bulk-rock and kerogen samples at 450-500 degrees C. Oval, elliptical, and spongy OPs gradually became interconnected and coalesced into organic microcracks. The diameter of newly formed microcracks increased with the degree of graphitization, exceeding 200 nm at temperatures above 500 degrees C. During this process, the rock matrix changed from being relatively compact to being relatively loose. Cambrian shale located in South China has irregular and arcuate OP boundaries under normal geological conditions, and the high thermal maturity of this shale may indicate that the coupling of OM carbonization and mechanical compaction is responsible for its poor development of OPs. Here, we present a schematic model for pore evolution in type-I/II marine shales that encompasses the entire hydrocarbon generation stage, which is based on semi-closed pyrolysis analyses. The model is examined using the collected and compilated data for many type-I/II marine shales around the world. These data show that naturally matured marine shales acquire a maximum porosity at 2.5% < Ro < 3.0%. This study provides an important guide for marine shale gas exploration and development in China. |
| DOI | 10.1021/acs.energyfuels.2c014206906 |
| Funding Organization | National Natural Science Found of China ; Key Laboratory of Petroleum Resources Research, Gansu Province ; National Natural Science Found of China ; Key Laboratory of Petroleum Resources Research, Gansu Province ; National Natural Science Found of China ; Key Laboratory of Petroleum Resources Research, Gansu Province ; National Natural Science Found of China ; Key Laboratory of Petroleum Resources Research, Gansu Province |
| WOS Keyword | SILURIAN LONGMAXI FORMATION ; LOWER CAMBRIAN SHALE ; SICHUAN BASIN ; HYDROCARBON GENERATION ; GAS-ADSORPTION ; JIAOSHIBA AREA ; RICH MUDSTONES ; ALBANY SHALE ; FE-SEM ; MATTER |
| Language | 英语 |
| Funding Project | National Natural Science Found of China[41672127] ; National Natural Science Found of China[41972213] ; Key Laboratory of Petroleum Resources Research, Gansu Province[SZDKFJJ20211003] |
| Funding Organization | National Natural Science Found of China ; Key Laboratory of Petroleum Resources Research, Gansu Province ; National Natural Science Found of China ; Key Laboratory of Petroleum Resources Research, Gansu Province ; National Natural Science Found of China ; Key Laboratory of Petroleum Resources Research, Gansu Province ; National Natural Science Found of China ; Key Laboratory of Petroleum Resources Research, Gansu Province |
| WOS Research Area | Energy & Fuels ; Engineering |
| WOS Subject | Energy & Fuels ; Engineering, Chemical |
| WOS ID | WOS:000826370400001 |
| Publisher | AMER CHEMICAL SOC |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.iggcas.ac.cn/handle/132A11/106840 |
| Collection | 兰州油气中心 |
| Corresponding Author | Wu, Chenjun; Tuo, Jincai |
| Affiliation | 1.Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Gansu, Peoples R China 2.Lanzhou Univ, Key Lab Mineral Resources Western China, Lanzhou 730000, Gansu, Peoples R China 3.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China 4.Yangtze Univ, Hubei Key Lab Petr Geochem & Environm, Wuhan 434023, Peoples R China 5.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China |
| Recommended Citation GB/T 7714 | Song, Dongjun,Wu, Chenjun,Tuo, Jincai. Relationships between Organic Structure Carbonization and Organic Pore Destruction at the Overmatured Stage: Implications for the Fate of Organic Pores in Marine Shales[J]. ENERGY & FUELS,2022,36(13):6906-6921. |
| APA | Song, Dongjun,Wu, Chenjun,&Tuo, Jincai.(2022).Relationships between Organic Structure Carbonization and Organic Pore Destruction at the Overmatured Stage: Implications for the Fate of Organic Pores in Marine Shales.ENERGY & FUELS,36(13),6906-6921. |
| MLA | Song, Dongjun,et al."Relationships between Organic Structure Carbonization and Organic Pore Destruction at the Overmatured Stage: Implications for the Fate of Organic Pores in Marine Shales".ENERGY & FUELS 36.13(2022):6906-6921. |
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