Thermal maturity calibration of extremely high-mature pre-Devonian strata: A case study from the Lower Cambrian Qiongzhusi Formation in the Sichuan Basin, South China

Wang, Ye; Qiu, Nansheng; Ni, Tao; Xie, Xiaomin; Cheng, Hongfei; Zuo, Zhaoxi; Ma, Zhongliang; Shen, Baojian; Borjigin, Tenger

doi:10.1016/j.geoen.2022.211411

Cited by 4 publications

(1 citation statement)

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“…Figure 6b reveals that the Dalong Formation is in the lower left corner of the intersection map, while the Wujiaping Formation is in the lower right corner of the intersection map; this suggests that the Wujiaping Formation, the Maokou Formation and the Dalong Formation are all in brackish environments. The V/Ni values are higher in the Wujiaping Formation and lower in the Dalong Formation; the palaeohydrates of the Wujiaping Formation are more saline, the Dalong Formation is lower, and the Maokou Formation is located between the two [66,67]. Fe/Mn values can also be used as an indicator of palaeoclimate, with high values indicating humid climates and low values indicating arid climates.…”

Section: Palaeosalinity Characteristicsmentioning

confidence: 99%

Organic Petrologic Characterization and Paleoenvironmental Analysis of Permian Shale in Northeast Sichuan Province, China

Jiang,

Xie

2024

Applied Sciences

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The Permian shale in Northeast Sichuan is an important shale oil and gas resource potential area, and the study of its organic matter characteristics and paleoenvironmental analysis is of great significance for revealing the shale oil and gas formation mechanism and resource evaluation. In this study, the organic matter of Permian shales in northeast Sichuan was carefully studied based on various analytical tools, such as petrology, laser Raman, microscopy, and principal trace elements, and the paleoenvironmental parameters of the shales were comprehensively analysed. A detailed study of the organic matter characteristics of Permian shales in northeast Sichuan reveals important features such as organic matter fractions, structural characteristics, maturity and sources. The results show that the organic matter of the shale consists mainly of solid bitumen, putrescine group, specular group and multicellular planktonic algae. Petrological observations and laser Raman analyses indicate a high maturity of the organic matter and a high content of organic carbon (TOC), showing good hydrocarbon potential. In this study, we reconstructed the palaeoenvironmental parameters and inferred the palaeoenvironmental evolution through palaeoenvironmental analyses of Permian shales in northeast Sichuan. The results of the comprehensive multi-indicator study show that the type of palaeoenvironment at the time of shale deposition was mainly an anoxic-reducing environment, and the depositional conditions were favourable to the enrichment and preservation of organic matter. In summary, the organic matter characteristics and paleoenvironmental analyses of the Permian shales in Northeast Sichuan provide important geological background information for an in-depth understanding of the formation mechanism, exploration potential and development prospect of shale hydrocarbons in this area. The results of this study can provide a scientific basis for the evaluation and development of shale oil and gas resources in this area, which is of great significance to geologists and the energy industry.

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Section: Palaeosalinity Characteristicsmentioning

confidence: 99%