Construction of a novel brittleness index equation and analysis of anisotropic brittleness characteristics for unconventional shale formations

Abstract The brittleness prediction of shale formations is of interest to researchers nowadays. Conventional methods of brittleness prediction are usually based on isotropic models while shale is anisotropic. In order to obtain a better prediction of shale brittleness, our study firstly proposed a n...

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Autores principales:	Ke-Ran Qian, Tao Liu, Jun-Zhou Liu, Xi-Wu Liu, Zhi-Liang He, Da-Jian Jiang
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2019
Materias:	Brittleness Shale Rock Physics Anisotropy Voigt–Reuss–Hill average Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/a0c20454c1054b2587d70b1faac23544
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spelling	oai:doaj.org-article:a0c20454c1054b2587d70b1faac235442021-12-02T11:20:56ZConstruction of a novel brittleness index equation and analysis of anisotropic brittleness characteristics for unconventional shale formations10.1007/s12182-019-00372-61672-51071995-8226https://doaj.org/article/a0c20454c1054b2587d70b1faac235442019-10-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-019-00372-6https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract The brittleness prediction of shale formations is of interest to researchers nowadays. Conventional methods of brittleness prediction are usually based on isotropic models while shale is anisotropic. In order to obtain a better prediction of shale brittleness, our study firstly proposed a novel brittleness index equation based on the Voigt–Reuss–Hill average, which combines two classical isotropic methods. The proposed method introduces upper and lower brittleness bounds, which take the uncertainty of brittleness prediction into consideration. In addition, this method can give us acceptable predictions by using limited input values. Secondly, an anisotropic rock physics model was constructed. Two parameters were introduced into our model, which can be used to simulate the lamination of clay minerals and the dip angle of formation. In addition, rock physics templates have been built to analyze the sensitivity of brittleness parameters. Finally, the effects of kerogen, pore structure, clay lamination and shale formation dip have been investigated in terms of anisotropy. The prediction shows that the vertical/horizontal Young’s modulus is always below one while the vertical/horizontal Poisson’s ratio (PR) can be either greater or less than 1. Our study finds different degrees of shale lamination may be the explanation for the random distribution of V ani (the ratio of vertical PR to horizontal PR).Ke-Ran QianTao LiuJun-Zhou LiuXi-Wu LiuZhi-Liang HeDa-Jian JiangKeAi Communications Co., Ltd.articleBrittlenessShaleRock PhysicsAnisotropyVoigt–Reuss–Hill averageScienceQPetrologyQE420-499ENPetroleum Science, Vol 17, Iss 1, Pp 70-85 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Brittleness Shale Rock Physics Anisotropy Voigt–Reuss–Hill average Science Q Petrology QE420-499
spellingShingle	Brittleness Shale Rock Physics Anisotropy Voigt–Reuss–Hill average Science Q Petrology QE420-499 Ke-Ran Qian Tao Liu Jun-Zhou Liu Xi-Wu Liu Zhi-Liang He Da-Jian Jiang Construction of a novel brittleness index equation and analysis of anisotropic brittleness characteristics for unconventional shale formations
description	Abstract The brittleness prediction of shale formations is of interest to researchers nowadays. Conventional methods of brittleness prediction are usually based on isotropic models while shale is anisotropic. In order to obtain a better prediction of shale brittleness, our study firstly proposed a novel brittleness index equation based on the Voigt–Reuss–Hill average, which combines two classical isotropic methods. The proposed method introduces upper and lower brittleness bounds, which take the uncertainty of brittleness prediction into consideration. In addition, this method can give us acceptable predictions by using limited input values. Secondly, an anisotropic rock physics model was constructed. Two parameters were introduced into our model, which can be used to simulate the lamination of clay minerals and the dip angle of formation. In addition, rock physics templates have been built to analyze the sensitivity of brittleness parameters. Finally, the effects of kerogen, pore structure, clay lamination and shale formation dip have been investigated in terms of anisotropy. The prediction shows that the vertical/horizontal Young’s modulus is always below one while the vertical/horizontal Poisson’s ratio (PR) can be either greater or less than 1. Our study finds different degrees of shale lamination may be the explanation for the random distribution of V ani (the ratio of vertical PR to horizontal PR).
format	article
author	Ke-Ran Qian Tao Liu Jun-Zhou Liu Xi-Wu Liu Zhi-Liang He Da-Jian Jiang
author_facet	Ke-Ran Qian Tao Liu Jun-Zhou Liu Xi-Wu Liu Zhi-Liang He Da-Jian Jiang
author_sort	Ke-Ran Qian
title	Construction of a novel brittleness index equation and analysis of anisotropic brittleness characteristics for unconventional shale formations
title_short	Construction of a novel brittleness index equation and analysis of anisotropic brittleness characteristics for unconventional shale formations
title_full	Construction of a novel brittleness index equation and analysis of anisotropic brittleness characteristics for unconventional shale formations
title_fullStr	Construction of a novel brittleness index equation and analysis of anisotropic brittleness characteristics for unconventional shale formations
title_full_unstemmed	Construction of a novel brittleness index equation and analysis of anisotropic brittleness characteristics for unconventional shale formations
title_sort	construction of a novel brittleness index equation and analysis of anisotropic brittleness characteristics for unconventional shale formations
publisher	KeAi Communications Co., Ltd.
publishDate	2019
url	https://doaj.org/article/a0c20454c1054b2587d70b1faac23544
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Construction of a novel brittleness index equation and analysis of anisotropic brittleness characteristics for unconventional shale formations

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