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The Volcanic Impacts on the Formation of Organic-Rich Shales From the Freshwater to Saline Lakes: Cases Study in the Ordos and the Junggar Basins
Wang, Xiaojun1; Gao, Jiahong2; Zhong, Liang3; He, Wenjun1; Jin, Zhijun2; Zhu, Rukai2,4; Liang, Xinping2; Liu, Kouqi2; Zhang, Wang5
2022-05-31
Source PublicationFRONTIERS IN EARTH SCIENCE
Volume10Pages:12
AbstractHigh organic matter abundance is necessary for large-scale hydrocarbon accumulation and enrichment in shale oil. Comparing conventional marine basins with lacustrine ones, the formation of organic matter in the latter usually changes rapidly with strong heterogeneity, which brings great challenges to identify sweet spot prediction and resource evaluation. In addition, water columns with different redox conditions also affect the burial and preservation of organic matter during the deposition of lacustrine shales, especially under the impact of ephemeral critical geological events such as volcanic activities. Therefore, determining the properties and the influencing factors on the water columns is one of the key scientific issues in revealing the differential enrichment of organic matter in such basins. By comparing the petrological and geochemical characteristics of organic-rich shales between a typical freshwater and a saline lacustrine basin, this study analyzes the depositional environment and water column properties during the burial and preservation of organic matter in the Ordos and Junggar basins. The results demonstrate that volcanic activity intensifies the degree of hypoxia during the formation of organic-rich matter, which in turn affects organic matter preservation. The sulfate reduction index (SRI) indicates that the organic-rich shale of the Chang seven Member (Ch(7)) of Yanchang Formation in the Ordos Basin and the Lucaogou Formation (P(2)l) in the Jimsar Sag of Junggar Basin in freshwater-saline environments have a certain intensity of sulfate reduction (BSR) (SRI <1.375). The organic matter consumed by BSR is lower than the preserved organic matter, resulting a higher TOC content. However, excessive volcanic activity or the input of hydrothermal fluids caused strong BSR (SRI >1.375) of the Fengcheng Formation (P(2)f) in saline lake of the Mahu Sag in Junggar Basin. This indicates that a large amount of organic matter was degraded and consumed, causing more iron oxides (and other iron-containing minerals) dissolve gradually to form pyrite, reducing the TOC content. This study enabled us to understand the shale oil enrichment, sweet spot prediction and evaluation, and propose a better theoretical and practical model for hydrocarbon accumulation in shale formations, to guide future exploration efforts.
Keywordvolcanic activity the freshwater and saline lakes Fengcheng Formation Lucaogou Formation Chang 7 Member organic-rich shale
DOI10.3389/feart.2022.918391
Funding OrganizationNatural Science Foundation of China ; Natural Science Foundation of China ; scientific research project of Sinopec ; scientific research project of Sinopec ; CNPC Xinjiang Company ; CNPC Xinjiang Company ; Natural Science Foundation of China ; Natural Science Foundation of China ; scientific research project of Sinopec ; scientific research project of Sinopec ; CNPC Xinjiang Company ; CNPC Xinjiang Company ; Natural Science Foundation of China ; Natural Science Foundation of China ; scientific research project of Sinopec ; scientific research project of Sinopec ; CNPC Xinjiang Company ; CNPC Xinjiang Company ; Natural Science Foundation of China ; Natural Science Foundation of China ; scientific research project of Sinopec ; scientific research project of Sinopec ; CNPC Xinjiang Company ; CNPC Xinjiang Company
WOS KeywordPYRITE FORMATION ; TIGHT OIL ; FENGCHENG FORMATION ; SULFATE REDUCTION ; IRON ; MATTER ; CARBON ; SULFUR ; SAG ; TRANSITION
Language英语
Funding ProjectNatural Science Foundation of China[42090025] ; Natural Science Foundation of China[42172151] ; scientific research project of Sinopec[P20049-1] ; CNPC Xinjiang Company
Funding OrganizationNatural Science Foundation of China ; Natural Science Foundation of China ; scientific research project of Sinopec ; scientific research project of Sinopec ; CNPC Xinjiang Company ; CNPC Xinjiang Company ; Natural Science Foundation of China ; Natural Science Foundation of China ; scientific research project of Sinopec ; scientific research project of Sinopec ; CNPC Xinjiang Company ; CNPC Xinjiang Company ; Natural Science Foundation of China ; Natural Science Foundation of China ; scientific research project of Sinopec ; scientific research project of Sinopec ; CNPC Xinjiang Company ; CNPC Xinjiang Company ; Natural Science Foundation of China ; Natural Science Foundation of China ; scientific research project of Sinopec ; scientific research project of Sinopec ; CNPC Xinjiang Company ; CNPC Xinjiang Company
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000811053000001
PublisherFRONTIERS MEDIA SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/106092
Collection中国科学院地质与地球物理研究所
Corresponding AuthorJin, Zhijun; Liang, Xinping
Affiliation1.PetroChina Xinjiang Oilfield Co, Res Inst Explorat & Dev, Karamay, Peoples R China
2.Peking Univ, Inst Energy, Beijing, Peoples R China
3.PetroChina Xinjiang Oilfield Co, Operat Area Fengcheng Oilfield, Karamay, Peoples R China
4.PetroChina, Res Inst Petr Explorat & Dev, Beijing, Peoples R China
5.Inst Geol & Geophys, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Wang, Xiaojun,Gao, Jiahong,Zhong, Liang,et al. The Volcanic Impacts on the Formation of Organic-Rich Shales From the Freshwater to Saline Lakes: Cases Study in the Ordos and the Junggar Basins[J]. FRONTIERS IN EARTH SCIENCE,2022,10:12.
APA Wang, Xiaojun.,Gao, Jiahong.,Zhong, Liang.,He, Wenjun.,Jin, Zhijun.,...&Zhang, Wang.(2022).The Volcanic Impacts on the Formation of Organic-Rich Shales From the Freshwater to Saline Lakes: Cases Study in the Ordos and the Junggar Basins.FRONTIERS IN EARTH SCIENCE,10,12.
MLA Wang, Xiaojun,et al."The Volcanic Impacts on the Formation of Organic-Rich Shales From the Freshwater to Saline Lakes: Cases Study in the Ordos and the Junggar Basins".FRONTIERS IN EARTH SCIENCE 10(2022):12.
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