Lithofacies Architecture and Distribution Patterns of Lacustrine Mixed Fine-Grained Rocks —a Case Study of Permian Lucaogou Formation in Jimsar Sag, NW China

As the controlling effect of complex lithofacies of lacustrine mixed fine-grained rocks on the shale oil sweet spot remains unclear, core, outcrop, general logging, nuclear magnetic resonance (NMR) logging, testing, and production data were used to study the types, combination pattern, and genesis o...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Senlin Yin, Baiyu Zhu, Youxin Wu, Feng Xu
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	mixed fine-grained rocks lithofacies architecture shale oil UAV sweet-spot lucaogou formation Science Q
Acceso en línea:	https://doaj.org/article/af1048efab52425f9aab3581155c3dac
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:af1048efab52425f9aab3581155c3dac
record_format	dspace
spelling	oai:doaj.org-article:af1048efab52425f9aab3581155c3dac2021-11-08T11:04:21ZLithofacies Architecture and Distribution Patterns of Lacustrine Mixed Fine-Grained Rocks —a Case Study of Permian Lucaogou Formation in Jimsar Sag, NW China2296-646310.3389/feart.2021.782208https://doaj.org/article/af1048efab52425f9aab3581155c3dac2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/feart.2021.782208/fullhttps://doaj.org/toc/2296-6463As the controlling effect of complex lithofacies of lacustrine mixed fine-grained rocks on the shale oil sweet spot remains unclear, core, outcrop, general logging, nuclear magnetic resonance (NMR) logging, testing, and production data were used to study the types, combination pattern, and genesis of lithofacies architectures of lacustrine mixed fine-grained rocks in the study area by lithofacies hierarchy analysis, X-ray fluorescence (XRF) logging, UAV, and 3D geological modeling. The research shows that: 1) According to lithology and sedimentary structure, the mixed fine-grained rocks can be divided into 13 lithofacies types of different origins in 5 sub-categories and 2 categories. 2) UAV photography was combined with a traditional field survey to characterize the 3D spatial distribution of lithofacies architecture of the Lucaogou Formation on the outcrop, and it is found that the lithofacies architecture patterns of mixed fine-grained rocks include three types: gradual change type, abrupt change type, and special type. The gradual change type with higher sand development degree and symmetrical lithofacies architecture has a high quality reservoir with dissolution pores, and is mixed beach-bar sand in the mixed zone. It is high in development degree and often appears as several similar cycles stacking over each other. The abrupt change type can be subdivided into two sub-types, asymmetric and smaller in reservoir thickness. It is very high in development degree and often comes in several similar cycles. The special type belongs to thick clastic rock relatively independent in the mixed fine-grained rocks with a high development degree of sand. The sand is a higher quality reservoir with properties of tight reservoir. It often appears as stacking of single cycle sand. 3) The different lithofacies architectures in the mixed fine-grained rocks have significant differences in distribution. The gradual change type is mainly composed of mudstone, dolomitic siltstone, and sandy dolomite, dolomitic siltstone, and mudstone, and appears in lenticular shape overlapping with each other on the plane. The abrupt change type is made up of felsic siltstone, dolomitic siltstone, sandy dolomite, and mudstone, and appears as isolated thin layers on the plane. The special type is mainly composed of mudstone and felsic siltstone, and mudstone, and turns up as lenses of different sizes on the plane.Senlin YinBaiyu ZhuYouxin WuYouxin WuFeng XuFrontiers Media S.A.articlemixed fine-grained rockslithofacies architectureshale oilUAVsweet-spotlucaogou formationScienceQENFrontiers in Earth Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	mixed fine-grained rocks lithofacies architecture shale oil UAV sweet-spot lucaogou formation Science Q
spellingShingle	mixed fine-grained rocks lithofacies architecture shale oil UAV sweet-spot lucaogou formation Science Q Senlin Yin Baiyu Zhu Youxin Wu Youxin Wu Feng Xu Lithofacies Architecture and Distribution Patterns of Lacustrine Mixed Fine-Grained Rocks —a Case Study of Permian Lucaogou Formation in Jimsar Sag, NW China
description	As the controlling effect of complex lithofacies of lacustrine mixed fine-grained rocks on the shale oil sweet spot remains unclear, core, outcrop, general logging, nuclear magnetic resonance (NMR) logging, testing, and production data were used to study the types, combination pattern, and genesis of lithofacies architectures of lacustrine mixed fine-grained rocks in the study area by lithofacies hierarchy analysis, X-ray fluorescence (XRF) logging, UAV, and 3D geological modeling. The research shows that: 1) According to lithology and sedimentary structure, the mixed fine-grained rocks can be divided into 13 lithofacies types of different origins in 5 sub-categories and 2 categories. 2) UAV photography was combined with a traditional field survey to characterize the 3D spatial distribution of lithofacies architecture of the Lucaogou Formation on the outcrop, and it is found that the lithofacies architecture patterns of mixed fine-grained rocks include three types: gradual change type, abrupt change type, and special type. The gradual change type with higher sand development degree and symmetrical lithofacies architecture has a high quality reservoir with dissolution pores, and is mixed beach-bar sand in the mixed zone. It is high in development degree and often appears as several similar cycles stacking over each other. The abrupt change type can be subdivided into two sub-types, asymmetric and smaller in reservoir thickness. It is very high in development degree and often comes in several similar cycles. The special type belongs to thick clastic rock relatively independent in the mixed fine-grained rocks with a high development degree of sand. The sand is a higher quality reservoir with properties of tight reservoir. It often appears as stacking of single cycle sand. 3) The different lithofacies architectures in the mixed fine-grained rocks have significant differences in distribution. The gradual change type is mainly composed of mudstone, dolomitic siltstone, and sandy dolomite, dolomitic siltstone, and mudstone, and appears in lenticular shape overlapping with each other on the plane. The abrupt change type is made up of felsic siltstone, dolomitic siltstone, sandy dolomite, and mudstone, and appears as isolated thin layers on the plane. The special type is mainly composed of mudstone and felsic siltstone, and mudstone, and turns up as lenses of different sizes on the plane.
format	article
author	Senlin Yin Baiyu Zhu Youxin Wu Youxin Wu Feng Xu
author_facet	Senlin Yin Baiyu Zhu Youxin Wu Youxin Wu Feng Xu
author_sort	Senlin Yin
title	Lithofacies Architecture and Distribution Patterns of Lacustrine Mixed Fine-Grained Rocks —a Case Study of Permian Lucaogou Formation in Jimsar Sag, NW China
title_short	Lithofacies Architecture and Distribution Patterns of Lacustrine Mixed Fine-Grained Rocks —a Case Study of Permian Lucaogou Formation in Jimsar Sag, NW China
title_full	Lithofacies Architecture and Distribution Patterns of Lacustrine Mixed Fine-Grained Rocks —a Case Study of Permian Lucaogou Formation in Jimsar Sag, NW China
title_fullStr	Lithofacies Architecture and Distribution Patterns of Lacustrine Mixed Fine-Grained Rocks —a Case Study of Permian Lucaogou Formation in Jimsar Sag, NW China
title_full_unstemmed	Lithofacies Architecture and Distribution Patterns of Lacustrine Mixed Fine-Grained Rocks —a Case Study of Permian Lucaogou Formation in Jimsar Sag, NW China
title_sort	lithofacies architecture and distribution patterns of lacustrine mixed fine-grained rocks —a case study of permian lucaogou formation in jimsar sag, nw china
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/af1048efab52425f9aab3581155c3dac
work_keys_str_mv	AT senlinyin lithofaciesarchitectureanddistributionpatternsoflacustrinemixedfinegrainedrocksacasestudyofpermianlucaogouformationinjimsarsagnwchina AT baiyuzhu lithofaciesarchitectureanddistributionpatternsoflacustrinemixedfinegrainedrocksacasestudyofpermianlucaogouformationinjimsarsagnwchina AT youxinwu lithofaciesarchitectureanddistributionpatternsoflacustrinemixedfinegrainedrocksacasestudyofpermianlucaogouformationinjimsarsagnwchina AT youxinwu lithofaciesarchitectureanddistributionpatternsoflacustrinemixedfinegrainedrocksacasestudyofpermianlucaogouformationinjimsarsagnwchina AT fengxu lithofaciesarchitectureanddistributionpatternsoflacustrinemixedfinegrainedrocksacasestudyofpermianlucaogouformationinjimsarsagnwchina
_version_	1718442459715862528

Lithofacies Architecture and Distribution Patterns of Lacustrine Mixed Fine-Grained Rocks —a Case Study of Permian Lucaogou Formation in Jimsar Sag, NW China

Ejemplares similares