Sequence architecture and sedimentary characteristics of a Middle Jurassic incised valley, western Sichuan depression, China

Abstract The Middle Jurassic Shaximiao Formation encompasses tens of meters of thick lowstand meandering valley (LMV) strata in the western Sichuan foreland basin. Ancient LMVs newly discovered in this area were further studied based on sequence stratigraphy and seismic sedimentology. The aim of the...

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Autores principales:	Jun-Long Liu, Wei Yin, You-Liang Ji, Tian-Yun Wang, Fu-Xiang Huang, Hai-Yue Yu, Wen-Shu Li
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2018
Materias:	Sequence architecture Sedimentary characteristic Lowstand meandering valley Western Sichuan depression Shaximiao Formation Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/0aa3f92c574845d299b7361a5e18d8d6
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id	oai:doaj.org-article:0aa3f92c574845d299b7361a5e18d8d6
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spelling	oai:doaj.org-article:0aa3f92c574845d299b7361a5e18d8d62021-12-02T07:24:43ZSequence architecture and sedimentary characteristics of a Middle Jurassic incised valley, western Sichuan depression, China10.1007/s12182-017-0211-01672-51071995-8226https://doaj.org/article/0aa3f92c574845d299b7361a5e18d8d62018-02-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-017-0211-0https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract The Middle Jurassic Shaximiao Formation encompasses tens of meters of thick lowstand meandering valley (LMV) strata in the western Sichuan foreland basin. Ancient LMVs newly discovered in this area were further studied based on sequence stratigraphy and seismic sedimentology. The aim of the present study was to investigate the sedimentary characteristics, sequence architecture, and the controls on LMV deposition in this tectonically active basin using field survey data, seismic sections, seismic amplitude imaging, core description, and comprehensive application of drilling data. The results show the following: (1) Three regional sequence boundaries and two flooding surfaces were recognized, and the Shaximiao Formation was divided into two-third-order sequences and four systems tracts. (2) Three sedimentary facies associations were identified: incised valley-fill, tributary channel, and overbank facies. Incised valleys are 5–17 km wide, 20–60 m deep and traceable for 120 km along their axes. (3) In the downstream segment, the role of tectonism gradually diminishes, and periodic base-level changes control the form and evolution of the incised valleys. Three types of LMVs—A1, A2, and A3—developed with changes in base level (lake level); of these types, the base level of the A3 LMV was likely the lowest.Jun-Long LiuWei YinYou-Liang JiTian-Yun WangFu-Xiang HuangHai-Yue YuWen-Shu LiKeAi Communications Co., Ltd.articleSequence architectureSedimentary characteristicLowstand meandering valleyWestern Sichuan depressionShaximiao FormationScienceQPetrologyQE420-499ENPetroleum Science, Vol 15, Iss 2, Pp 230-251 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Sequence architecture Sedimentary characteristic Lowstand meandering valley Western Sichuan depression Shaximiao Formation Science Q Petrology QE420-499
spellingShingle	Sequence architecture Sedimentary characteristic Lowstand meandering valley Western Sichuan depression Shaximiao Formation Science Q Petrology QE420-499 Jun-Long Liu Wei Yin You-Liang Ji Tian-Yun Wang Fu-Xiang Huang Hai-Yue Yu Wen-Shu Li Sequence architecture and sedimentary characteristics of a Middle Jurassic incised valley, western Sichuan depression, China
description	Abstract The Middle Jurassic Shaximiao Formation encompasses tens of meters of thick lowstand meandering valley (LMV) strata in the western Sichuan foreland basin. Ancient LMVs newly discovered in this area were further studied based on sequence stratigraphy and seismic sedimentology. The aim of the present study was to investigate the sedimentary characteristics, sequence architecture, and the controls on LMV deposition in this tectonically active basin using field survey data, seismic sections, seismic amplitude imaging, core description, and comprehensive application of drilling data. The results show the following: (1) Three regional sequence boundaries and two flooding surfaces were recognized, and the Shaximiao Formation was divided into two-third-order sequences and four systems tracts. (2) Three sedimentary facies associations were identified: incised valley-fill, tributary channel, and overbank facies. Incised valleys are 5–17 km wide, 20–60 m deep and traceable for 120 km along their axes. (3) In the downstream segment, the role of tectonism gradually diminishes, and periodic base-level changes control the form and evolution of the incised valleys. Three types of LMVs—A1, A2, and A3—developed with changes in base level (lake level); of these types, the base level of the A3 LMV was likely the lowest.
format	article
author	Jun-Long Liu Wei Yin You-Liang Ji Tian-Yun Wang Fu-Xiang Huang Hai-Yue Yu Wen-Shu Li
author_facet	Jun-Long Liu Wei Yin You-Liang Ji Tian-Yun Wang Fu-Xiang Huang Hai-Yue Yu Wen-Shu Li
author_sort	Jun-Long Liu
title	Sequence architecture and sedimentary characteristics of a Middle Jurassic incised valley, western Sichuan depression, China
title_short	Sequence architecture and sedimentary characteristics of a Middle Jurassic incised valley, western Sichuan depression, China
title_full	Sequence architecture and sedimentary characteristics of a Middle Jurassic incised valley, western Sichuan depression, China
title_fullStr	Sequence architecture and sedimentary characteristics of a Middle Jurassic incised valley, western Sichuan depression, China
title_full_unstemmed	Sequence architecture and sedimentary characteristics of a Middle Jurassic incised valley, western Sichuan depression, China
title_sort	sequence architecture and sedimentary characteristics of a middle jurassic incised valley, western sichuan depression, china
publisher	KeAi Communications Co., Ltd.
publishDate	2018
url	https://doaj.org/article/0aa3f92c574845d299b7361a5e18d8d6
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Sequence architecture and sedimentary characteristics of a Middle Jurassic incised valley, western Sichuan depression, China

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