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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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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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.</description><identifier>ISSN: 2075-163X</identifier><identifier>EISSN: 2075-163X</identifier><identifier>DOI: 10.3390/min13030332</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>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</subject><ispartof>Minerals (Basel), 2023-03, Vol.13 (3), p.332</ispartof><rights>COPYRIGHT 2023 MDPI AG</rights><rights>2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). 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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. 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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.</description><subject>Accumulation</subject><subject>Anoxia</subject><subject>Anoxic sediments</subject><subject>Basins (Geology)</subject><subject>Biomarkers</subject><subject>Blooms</subject><subject>Bottom water</subject><subject>Carbon</subject><subject>Chromatography</subject><subject>Composition</subject><subject>Enrichment</subject><subject>Hydrocarbons</subject><subject>Isotopes</subject><subject>Laboratories</subject><subject>Mass spectrometry</subject><subject>Mountains</subject><subject>Organic matter</subject><subject>Permian</subject><subject>Petroleum</subject><subject>Petrology</subject><subject>Productivity</subject><subject>Scientific 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Organic Matter in Sediments of the Middle Permian around Bogda Mountain, Southern Junggar Basin, NW China</atitle><jtitle>Minerals (Basel)</jtitle><date>2023-03-01</date><risdate>2023</risdate><volume>13</volume><issue>3</issue><spage>332</spage><pages>332-</pages><issn>2075-163X</issn><eissn>2075-163X</eissn><abstract>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.</abstract><cop>Basel</cop><pub>MDPI AG</pub><doi>10.3390/min13030332</doi><orcidid>https://orcid.org/0000-0002-7845-1253</orcidid><oa>free_for_read</oa></addata></record> |
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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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