Geochemical Characteristics of Elements and Main Controlling Factors of Organic Matter Enrichment in Shale from Wufeng Formation to Submember Long-11 in Southern Sichuan
Abstract
:1. Introduction
2. Geological Condition
3. Sample and Method
4. Laboratory Result
4.1. TOC
4.2. Chemical Characteristics of Elements
5. Discussion
5.1. Relationship between REDOX Conditions and Total Organic Carbon Content
5.2. Primary Productivity
5.3. Terrigenous Material Content
5.4. Relative Height of Sea Level
6. Conclusions
- (1)
- The trace elements such as Mo, U, Ba and Ni are relatively enriched in the shale of Wufeng Formation–Submember Long-11 in the Changning area, while the Co element is deficient. The distribution pattern of rare earth is flat, which indicates that the shale deposits in the research area are weakly influenced by terrigenous materials.
- (2)
- During the shale deposition period of Wufeng Formation–Submember Long-11 in the Changning area, the REDOX conditions of the water body changed many times, and they were generally dominated by an anaerobic environment. The shale of Bed Long-111 and Bed Long-112 was generally an anaerobic environment, the shale of Bed Long-113 was generally an oxygen-poor environment, and the shale of Bed Long-114 changed from an oxygen-poor environment to an oxygen-rich environment. The water REDOX conditions of the Wufeng Formation varied greatly, mainly in terms of the oxygen-poor and anaerobic environment.
- (3)
- Organic matter enrichment in Wufeng Formation–Submember Long-11 in the Changning area was mainly controlled by REDOX conditions; the amount of terrigenous injection in Wufeng Formation was higher than that in Bed Long-111, and the amount of terrigenous injection gradually increased from Bed Long-111 to Bed Long-114, which resulted in the reduction and dilution of organic matter, and this was an important reason for the decrease in organic matter content. A relatively high sea level has a positive effect on organic matter enrichment. There is no obvious relationship between the paleoproductivity and organic matter enrichment.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Xiong, R.; Zhong, Q.; Ren, Z. Geochemical Characteristics of Elements and Main Controlling Factors of Organic Matter Enrichment in Shale from Wufeng Formation to Submember Long-11 in Southern Sichuan. Appl. Sci. 2023, 13, 8864. https://doi.org/10.3390/app13158864
Xiong R, Zhong Q, Ren Z. Geochemical Characteristics of Elements and Main Controlling Factors of Organic Matter Enrichment in Shale from Wufeng Formation to Submember Long-11 in Southern Sichuan. Applied Sciences. 2023; 13(15):8864. https://doi.org/10.3390/app13158864
Chicago/Turabian StyleXiong, Rong, Quan Zhong, and Zhenxing Ren. 2023. "Geochemical Characteristics of Elements and Main Controlling Factors of Organic Matter Enrichment in Shale from Wufeng Formation to Submember Long-11 in Southern Sichuan" Applied Sciences 13, no. 15: 8864. https://doi.org/10.3390/app13158864