Mechanisms for the Accumulation of Organic Matter in Sediments of the Middle Permian around Bogda Mountain, Southern Junggar Basin, NW China

The organic-rich shales and mudstones of the Middle Permian are the most important unconventional petroleum targets in the southern Junggar Basin of northwestern China. Although numerous studies have been vigorously conducted on paleoenvironment reconstructions, the organic matter enrichment mechani...

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Veröffentlicht in:Minerals (Basel) 2023-03, Vol.13 (3), p.332
Hauptverfasser: Jin, Xiao, Feng, Yanfang, Qiu, Wenhong Johnson, Luo, Xiaoling, Wen, Xinyu, Zhang, Suowen, Zhang, Zhihuan
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container_issue 3
container_start_page 332
container_title Minerals (Basel)
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creator Jin, Xiao
Feng, Yanfang
Qiu, Wenhong Johnson
Luo, Xiaoling
Wen, Xinyu
Zhang, Suowen
Zhang, Zhihuan
description The organic-rich shales and mudstones of the Middle Permian are the most important unconventional petroleum targets in the southern Junggar Basin of northwestern China. Although numerous studies have been vigorously conducted on paleoenvironment reconstructions, the organic matter enrichment mechanism is still controversial due to the utilization of problematic geochemical proxies established in early studies. In this study, major and trace elemental compositions, molecular markers, stable carbon isotopic compositions, and organic petrology were used to study multiple factors affecting the accumulation of organic matter in sediments. According to the results, a relatively hydrostatic, brackish, anoxic environment is proposed in the northern periphery of the Bogda Mountain, where the original structure of organic matter could be preserved with non-correlations between the productivity proxies (P and Ba) and TOC. In the western Bogda area, organic-rich sediments were deposited under suboxic conditions, with frequent fluctuation occurring between the top and bottom water columns. The accumulation of organic matter was the result of productivity blooms and rapid sedimentation. This improved study of the enrichment of organic matter in the Middle Permian around the Bogda Mountain can contribute to improved evaluations of the petroleum potential and distinguishing the characteristics of different organic matter enrichment models.
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source MDPI - Multidisciplinary Digital Publishing Institute; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection
subjects Accumulation
Anoxia
Anoxic sediments
Basins (Geology)
Biomarkers
Blooms
Bottom water
Carbon
Chromatography
Composition
Enrichment
Hydrocarbons
Isotopes
Laboratories
Mass spectrometry
Mountains
Organic matter
Permian
Petroleum
Petrology
Productivity
Scientific imaging
Sediment
Sediments
Sediments (Geology)
Total organic carbon
Trace elements
Water circulation
Water column
title Mechanisms for the Accumulation of Organic Matter in Sediments of the Middle Permian around Bogda Mountain, Southern Junggar Basin, NW China
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