Sedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of China
Abstract The Upper Ordovician–Lower Silurian mudstones (including the Wufeng, Guanyinqiao and Longmaxi Formations) in the Sichuan Basin are some of the most important shale gas plays in China. In order to enhance our understanding of the process of formation of organic carbon up to 10%, optical, mic...
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doaj-94dc5f90c0304b5d93466191ecd3e8602020-11-25T02:33:20ZengSpringerOpenPetroleum Science1672-51071995-82262018-12-01161445710.1007/s12182-018-0283-5Sedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of ChinaLei Yang0Bo Ran1Yu-Yue Han2Shu-Gen Liu3Yue-Hao Ye4Christopher Xiao5Wei Sun6Di Yang7Guo-Dong Xia8Shi-Yu Wang9School of Earth Sciences and Resources, China University of GeosciencesState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of TechnologyState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of TechnologyState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of TechnologyState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of TechnologyUniversity of HoustonState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of TechnologyState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of TechnologyState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of TechnologyResearch Institute of Yanchang Petroleum (Group) Co. LtdAbstract The Upper Ordovician–Lower Silurian mudstones (including the Wufeng, Guanyinqiao and Longmaxi Formations) in the Sichuan Basin are some of the most important shale gas plays in China. In order to enhance our understanding of the process of formation of organic carbon up to 10%, optical, microscopy and geochemical methods have been used to investigate the petrographic and geochemical characteristics of the formation. Firstly, three mudstone lithofacies were identified based on a wide variety of mudstone laminations. These are: (a) indistinctly laminated mudstone; (b) parallel-laminated mudstone; and (c) nonparallel-laminated mudstone. Then, combining with the evidence from depocenter migration, Th/U ratios and total organic carbon, the abundant organo-minerallic fabrics suggest that organic carbon was preferentially deposited and preserved in anoxic, low energy and stagnant water conditions during deposition of the Wufeng and Longmaxi Formations. On the contrary, the Guanyinqiao Formation with poor organic carbon was deposited in oxic and high-energy water conditions.http://link.springer.com/article/10.1007/s12182-018-0283-5Guanyinqiao FormationSichuan BasinMudstoneLaminated mudstoneWater condition |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Lei Yang Bo Ran Yu-Yue Han Shu-Gen Liu Yue-Hao Ye Christopher Xiao Wei Sun Di Yang Guo-Dong Xia Shi-Yu Wang |
spellingShingle |
Lei Yang Bo Ran Yu-Yue Han Shu-Gen Liu Yue-Hao Ye Christopher Xiao Wei Sun Di Yang Guo-Dong Xia Shi-Yu Wang Sedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of China Petroleum Science Guanyinqiao Formation Sichuan Basin Mudstone Laminated mudstone Water condition |
author_facet |
Lei Yang Bo Ran Yu-Yue Han Shu-Gen Liu Yue-Hao Ye Christopher Xiao Wei Sun Di Yang Guo-Dong Xia Shi-Yu Wang |
author_sort |
Lei Yang |
title |
Sedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of China |
title_short |
Sedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of China |
title_full |
Sedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of China |
title_fullStr |
Sedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of China |
title_full_unstemmed |
Sedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of China |
title_sort |
sedimentary environment controls on the accumulation of organic matter in the upper ordovician wufeng–lower silurian longmaxi mudstones in the southeastern sichuan basin of china |
publisher |
SpringerOpen |
series |
Petroleum Science |
issn |
1672-5107 1995-8226 |
publishDate |
2018-12-01 |
description |
Abstract The Upper Ordovician–Lower Silurian mudstones (including the Wufeng, Guanyinqiao and Longmaxi Formations) in the Sichuan Basin are some of the most important shale gas plays in China. In order to enhance our understanding of the process of formation of organic carbon up to 10%, optical, microscopy and geochemical methods have been used to investigate the petrographic and geochemical characteristics of the formation. Firstly, three mudstone lithofacies were identified based on a wide variety of mudstone laminations. These are: (a) indistinctly laminated mudstone; (b) parallel-laminated mudstone; and (c) nonparallel-laminated mudstone. Then, combining with the evidence from depocenter migration, Th/U ratios and total organic carbon, the abundant organo-minerallic fabrics suggest that organic carbon was preferentially deposited and preserved in anoxic, low energy and stagnant water conditions during deposition of the Wufeng and Longmaxi Formations. On the contrary, the Guanyinqiao Formation with poor organic carbon was deposited in oxic and high-energy water conditions. |
topic |
Guanyinqiao Formation Sichuan Basin Mudstone Laminated mudstone Water condition |
url |
http://link.springer.com/article/10.1007/s12182-018-0283-5 |
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