Source Rock Evaluation and Hydrocarbon Generation Model of a Permian Alkaline Lakes—A Case Study of the Fengcheng Formation in the Mahu Sag, Junggar Basin
The alkaline lake source rocks of the Fengcheng Formation are developed in the Mahu Sag of the Junggar Basin. Different from traditional continental fresh water and saltwater lake source rocks, alkaline lake source rocks lack targeted evaluation criteria, and it is unknown whether their hydrocarbon...
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| Veröffentlicht in: | Minerals (Basel) 2021-06, Vol.11 (6), p.644 |
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| creator | Tang, Yong He, Wenjun Bai, Yubin Zhang, Xiang Zhao, Jingzhou Yang, Sen Wu, Heyuan Zou, Yang Wu, Weitao |
| description | The alkaline lake source rocks of the Fengcheng Formation are developed in the Mahu Sag of the Junggar Basin. Different from traditional continental fresh water and saltwater lake source rocks, alkaline lake source rocks lack targeted evaluation criteria, and it is unknown whether their hydrocarbon generation models are consistent with traditional models. Therefore, in the present study, evaluation standards and hydrocarbon generation models of alkaline lake source rocks are discussed based on geological and organic geochemical data and a systematic summary of the geochemical characteristics of the Fengcheng Formation source rocks. The Fengcheng Formation source rocks are mainly diamictite with mixed argillaceous rock and dolomite; most total organic carbon (TOC) values range from 0.2–1.4%; and the kerogen is primarily oil-prone type II, reaching low- to high-maturity stages. Based on the types of organic matter in source rocks and the relationships between organic matter abundance parameters, the evaluation standard of alkaline lake source rocks is proposed. The Fengcheng Formation is mainly composed of good to excellent source rocks (55.5%) with high hydrocarbon generation potential. The single-peak hydrocarbon generation model of the Fengcheng Formation is similar to that of traditional freshwater or saltwater lakes, with a high hydrocarbon generation rate, two to five times that of the traditional model; its main particularity is in the formation of naphthenic crude oil from the kerogen of bacteria and algae. A new understanding of the hydrocarbon generation potential and model of alkaline lake source rocks in the Fengcheng Formation can provide support for tight oil and shale oil exploration in the Mahu Sag. |
| doi_str_mv | 10.3390/min11060644 |
| format | Article |
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Different from traditional continental fresh water and saltwater lake source rocks, alkaline lake source rocks lack targeted evaluation criteria, and it is unknown whether their hydrocarbon generation models are consistent with traditional models. Therefore, in the present study, evaluation standards and hydrocarbon generation models of alkaline lake source rocks are discussed based on geological and organic geochemical data and a systematic summary of the geochemical characteristics of the Fengcheng Formation source rocks. The Fengcheng Formation source rocks are mainly diamictite with mixed argillaceous rock and dolomite; most total organic carbon (TOC) values range from 0.2–1.4%; and the kerogen is primarily oil-prone type II, reaching low- to high-maturity stages. Based on the types of organic matter in source rocks and the relationships between organic matter abundance parameters, the evaluation standard of alkaline lake source rocks is proposed. The Fengcheng Formation is mainly composed of good to excellent source rocks (55.5%) with high hydrocarbon generation potential. The single-peak hydrocarbon generation model of the Fengcheng Formation is similar to that of traditional freshwater or saltwater lakes, with a high hydrocarbon generation rate, two to five times that of the traditional model; its main particularity is in the formation of naphthenic crude oil from the kerogen of bacteria and algae. A new understanding of the hydrocarbon generation potential and model of alkaline lake source rocks in the Fengcheng Formation can provide support for tight oil and shale oil exploration in the Mahu Sag.</description><identifier>ISSN: 2075-163X</identifier><identifier>EISSN: 2075-163X</identifier><identifier>DOI: 10.3390/min11060644</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Algae ; Bacteria ; Biomarkers ; Carbon ; Crude oil ; Dolomite ; Dolostone ; Evaluation ; Fresh water ; Freshwater ; Freshwater lakes ; Geochemistry ; Hydrocarbons ; Inland water environment ; Kerogen ; Lakes ; Lithology ; Oil and gas exploration ; Oil exploration ; Oil shale ; Organic carbon ; Organic matter ; Particle size ; Permian ; Quality standards ; Rocks ; Saline water ; Salinity ; Sedimentary rocks ; Shale ; Shale oil ; Stratigraphy ; Total organic carbon</subject><ispartof>Minerals (Basel), 2021-06, Vol.11 (6), p.644</ispartof><rights>2021 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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Different from traditional continental fresh water and saltwater lake source rocks, alkaline lake source rocks lack targeted evaluation criteria, and it is unknown whether their hydrocarbon generation models are consistent with traditional models. Therefore, in the present study, evaluation standards and hydrocarbon generation models of alkaline lake source rocks are discussed based on geological and organic geochemical data and a systematic summary of the geochemical characteristics of the Fengcheng Formation source rocks. The Fengcheng Formation source rocks are mainly diamictite with mixed argillaceous rock and dolomite; most total organic carbon (TOC) values range from 0.2–1.4%; and the kerogen is primarily oil-prone type II, reaching low- to high-maturity stages. Based on the types of organic matter in source rocks and the relationships between organic matter abundance parameters, the evaluation standard of alkaline lake source rocks is proposed. The Fengcheng Formation is mainly composed of good to excellent source rocks (55.5%) with high hydrocarbon generation potential. The single-peak hydrocarbon generation model of the Fengcheng Formation is similar to that of traditional freshwater or saltwater lakes, with a high hydrocarbon generation rate, two to five times that of the traditional model; its main particularity is in the formation of naphthenic crude oil from the kerogen of bacteria and algae. A new understanding of the hydrocarbon generation potential and model of alkaline lake source rocks in the Fengcheng Formation can provide support for tight oil and shale oil exploration in the Mahu Sag.</description><subject>Algae</subject><subject>Bacteria</subject><subject>Biomarkers</subject><subject>Carbon</subject><subject>Crude oil</subject><subject>Dolomite</subject><subject>Dolostone</subject><subject>Evaluation</subject><subject>Fresh water</subject><subject>Freshwater</subject><subject>Freshwater lakes</subject><subject>Geochemistry</subject><subject>Hydrocarbons</subject><subject>Inland water environment</subject><subject>Kerogen</subject><subject>Lakes</subject><subject>Lithology</subject><subject>Oil and gas exploration</subject><subject>Oil exploration</subject><subject>Oil shale</subject><subject>Organic carbon</subject><subject>Organic matter</subject><subject>Particle size</subject><subject>Permian</subject><subject>Quality 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Rock Evaluation and Hydrocarbon Generation Model of a Permian Alkaline Lakes—A Case Study of the Fengcheng Formation in the Mahu Sag, Junggar Basin</title><author>Tang, Yong ; He, Wenjun ; Bai, Yubin ; Zhang, Xiang ; Zhao, Jingzhou ; Yang, Sen ; Wu, Heyuan ; Zou, Yang ; Wu, Weitao</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a321t-508cdf7450c244b017bdb8e9409cae93af54bc2aef54f3d22edf998389abf4953</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Algae</topic><topic>Bacteria</topic><topic>Biomarkers</topic><topic>Carbon</topic><topic>Crude oil</topic><topic>Dolomite</topic><topic>Dolostone</topic><topic>Evaluation</topic><topic>Fresh water</topic><topic>Freshwater</topic><topic>Freshwater lakes</topic><topic>Geochemistry</topic><topic>Hydrocarbons</topic><topic>Inland water environment</topic><topic>Kerogen</topic><topic>Lakes</topic><topic>Lithology</topic><topic>Oil and gas exploration</topic><topic>Oil exploration</topic><topic>Oil shale</topic><topic>Organic carbon</topic><topic>Organic matter</topic><topic>Particle size</topic><topic>Permian</topic><topic>Quality standards</topic><topic>Rocks</topic><topic>Saline water</topic><topic>Salinity</topic><topic>Sedimentary rocks</topic><topic>Shale</topic><topic>Shale oil</topic><topic>Stratigraphy</topic><topic>Total organic carbon</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Tang, Yong</creatorcontrib><creatorcontrib>He, Wenjun</creatorcontrib><creatorcontrib>Bai, Yubin</creatorcontrib><creatorcontrib>Zhang, Xiang</creatorcontrib><creatorcontrib>Zhao, Jingzhou</creatorcontrib><creatorcontrib>Yang, Sen</creatorcontrib><creatorcontrib>Wu, Heyuan</creatorcontrib><creatorcontrib>Zou, Yang</creatorcontrib><creatorcontrib>Wu, Weitao</creatorcontrib><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Oceanic 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Jingzhou</au><au>Yang, Sen</au><au>Wu, Heyuan</au><au>Zou, Yang</au><au>Wu, Weitao</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Source Rock Evaluation and Hydrocarbon Generation Model of a Permian Alkaline Lakes—A Case Study of the Fengcheng Formation in the Mahu Sag, Junggar Basin</atitle><jtitle>Minerals (Basel)</jtitle><date>2021-06-01</date><risdate>2021</risdate><volume>11</volume><issue>6</issue><spage>644</spage><pages>644-</pages><issn>2075-163X</issn><eissn>2075-163X</eissn><abstract>The alkaline lake source rocks of the Fengcheng Formation are developed in the Mahu Sag of the Junggar Basin. Different from traditional continental fresh water and saltwater lake source rocks, alkaline lake source rocks lack targeted evaluation criteria, and it is unknown whether their hydrocarbon generation models are consistent with traditional models. Therefore, in the present study, evaluation standards and hydrocarbon generation models of alkaline lake source rocks are discussed based on geological and organic geochemical data and a systematic summary of the geochemical characteristics of the Fengcheng Formation source rocks. The Fengcheng Formation source rocks are mainly diamictite with mixed argillaceous rock and dolomite; most total organic carbon (TOC) values range from 0.2–1.4%; and the kerogen is primarily oil-prone type II, reaching low- to high-maturity stages. Based on the types of organic matter in source rocks and the relationships between organic matter abundance parameters, the evaluation standard of alkaline lake source rocks is proposed. The Fengcheng Formation is mainly composed of good to excellent source rocks (55.5%) with high hydrocarbon generation potential. The single-peak hydrocarbon generation model of the Fengcheng Formation is similar to that of traditional freshwater or saltwater lakes, with a high hydrocarbon generation rate, two to five times that of the traditional model; its main particularity is in the formation of naphthenic crude oil from the kerogen of bacteria and algae. A new understanding of the hydrocarbon generation potential and model of alkaline lake source rocks in the Fengcheng Formation can provide support for tight oil and shale oil exploration in the Mahu Sag.</abstract><cop>Basel</cop><pub>MDPI AG</pub><doi>10.3390/min11060644</doi><orcidid>https://orcid.org/0000-0002-5140-3606</orcidid><orcidid>https://orcid.org/0000-0002-9865-2730</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Algae Bacteria Biomarkers Carbon Crude oil Dolomite Dolostone Evaluation Fresh water Freshwater Freshwater lakes Geochemistry Hydrocarbons Inland water environment Kerogen Lakes Lithology Oil and gas exploration Oil exploration Oil shale Organic carbon Organic matter Particle size Permian Quality standards Rocks Saline water Salinity Sedimentary rocks Shale Shale oil Stratigraphy Total organic carbon |
| title | Source Rock Evaluation and Hydrocarbon Generation Model of a Permian Alkaline Lakes—A Case Study of the Fengcheng Formation in the Mahu Sag, Junggar Basin |
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