Geometric Heterogeneity of Continental Shale in the Yanchang Formation, Southern Ordos Basin, China

Abstract Favorable prospects for the exploration of shale gas have been demonstrated in the Ordos Basin, China. Outcrop and core observations indicate that there are abundant laminas in the shale strata, which exert a great influence on hydro-fracture propagation, gas storage and fluid flow. In this...

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Autores principales:	Lihui Li, Beixiu Huang, Yufang Tan, Xiaolong Deng, Yanyan Li, Hu Zheng
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/25add96e2f91470b923fc96990fc6023
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spelling	oai:doaj.org-article:25add96e2f91470b923fc96990fc60232021-12-02T15:05:10ZGeometric Heterogeneity of Continental Shale in the Yanchang Formation, Southern Ordos Basin, China10.1038/s41598-017-05144-z2045-2322https://doaj.org/article/25add96e2f91470b923fc96990fc60232017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05144-zhttps://doaj.org/toc/2045-2322Abstract Favorable prospects for the exploration of shale gas have been demonstrated in the Ordos Basin, China. Outcrop and core observations indicate that there are abundant laminas in the shale strata, which exert a great influence on hydro-fracture propagation, gas storage and fluid flow. In this study, the continental shale of the Chang 72 Member, collected from the south of Ordos Basin, was investigated to characterize the geometric heterogeneity. Laminas at multiple scales were observed and measured using conventional logging, borehole TV, core analysis, scanning electron microscopy, and the Particle and Crack Analysis System. These measurement tools correspond to the meter scale, decimeter scale, centimeter scale, millimeter scale and ten-micrometer scale, respectively, with measured thicknesses of 2.26 m, 2.09 dm, 1.70 cm, 1.48 mm and 11.70 μm, respectively. Fractal theory was used to analyze the power exponent distribution of the lamina thickness, with a resulting fractal dimension of 1.06. Finally, a geometric heterogeneity model was proposed for the Upper Triassic Yanchang Formation in the study area and verified by a modeled thickness of 26.30 m for the Chang 72 Member at the 10-m scale. The model facilitates cross-scale analysis and provides parameter guidance for heterogeneity characterization in the numerical simulation and model test of the shale gas reservoir.Lihui LiBeixiu HuangYufang TanXiaolong DengYanyan LiHu ZhengNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Lihui Li Beixiu Huang Yufang Tan Xiaolong Deng Yanyan Li Hu Zheng Geometric Heterogeneity of Continental Shale in the Yanchang Formation, Southern Ordos Basin, China
description	Abstract Favorable prospects for the exploration of shale gas have been demonstrated in the Ordos Basin, China. Outcrop and core observations indicate that there are abundant laminas in the shale strata, which exert a great influence on hydro-fracture propagation, gas storage and fluid flow. In this study, the continental shale of the Chang 72 Member, collected from the south of Ordos Basin, was investigated to characterize the geometric heterogeneity. Laminas at multiple scales were observed and measured using conventional logging, borehole TV, core analysis, scanning electron microscopy, and the Particle and Crack Analysis System. These measurement tools correspond to the meter scale, decimeter scale, centimeter scale, millimeter scale and ten-micrometer scale, respectively, with measured thicknesses of 2.26 m, 2.09 dm, 1.70 cm, 1.48 mm and 11.70 μm, respectively. Fractal theory was used to analyze the power exponent distribution of the lamina thickness, with a resulting fractal dimension of 1.06. Finally, a geometric heterogeneity model was proposed for the Upper Triassic Yanchang Formation in the study area and verified by a modeled thickness of 26.30 m for the Chang 72 Member at the 10-m scale. The model facilitates cross-scale analysis and provides parameter guidance for heterogeneity characterization in the numerical simulation and model test of the shale gas reservoir.
format	article
author	Lihui Li Beixiu Huang Yufang Tan Xiaolong Deng Yanyan Li Hu Zheng
author_facet	Lihui Li Beixiu Huang Yufang Tan Xiaolong Deng Yanyan Li Hu Zheng
author_sort	Lihui Li
title	Geometric Heterogeneity of Continental Shale in the Yanchang Formation, Southern Ordos Basin, China
title_short	Geometric Heterogeneity of Continental Shale in the Yanchang Formation, Southern Ordos Basin, China
title_full	Geometric Heterogeneity of Continental Shale in the Yanchang Formation, Southern Ordos Basin, China
title_fullStr	Geometric Heterogeneity of Continental Shale in the Yanchang Formation, Southern Ordos Basin, China
title_full_unstemmed	Geometric Heterogeneity of Continental Shale in the Yanchang Formation, Southern Ordos Basin, China
title_sort	geometric heterogeneity of continental shale in the yanchang formation, southern ordos basin, china
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/25add96e2f91470b923fc96990fc6023
work_keys_str_mv	AT lihuili geometricheterogeneityofcontinentalshaleintheyanchangformationsouthernordosbasinchina AT beixiuhuang geometricheterogeneityofcontinentalshaleintheyanchangformationsouthernordosbasinchina AT yufangtan geometricheterogeneityofcontinentalshaleintheyanchangformationsouthernordosbasinchina AT xiaolongdeng geometricheterogeneityofcontinentalshaleintheyanchangformationsouthernordosbasinchina AT yanyanli geometricheterogeneityofcontinentalshaleintheyanchangformationsouthernordosbasinchina AT huzheng geometricheterogeneityofcontinentalshaleintheyanchangformationsouthernordosbasinchina
_version_	1718388879068758016

Geometric Heterogeneity of Continental Shale in the Yanchang Formation, Southern Ordos Basin, China

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