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Geologic characterization of a Lower Cambrian marine shale; implications for shale gas potential in northwestern Hunan, south China

Xiao Zhenghui, Liu Jisong, Tan Jingqiang, Yang Rongfeng, Jason Hilton, Zhou Ping, Wang Zhaohui and Cao Yunjiang
Geologic characterization of a Lower Cambrian marine shale; implications for shale gas potential in northwestern Hunan, south China
Interpretation (Tulsa) (August 2018) 6 (3): T635-T647

Abstract

We have investigated the geologic features of the lower Cambrian-aged Niutitang Shale in the northwestern Hunan province of South China. Our results indicate that the Niutitang Shale has abundant and highly mature algal kerogen with total organic carbon (TOC) content ranging from 0.6% to 18.2%. The equivalent vitrinite reflectance (equal-Ro) value is between 2.5% and 4.3%. Mineral constituents are dominated by quartz and clay. The average quartz content (62.8%) is much higher than that of clay minerals (26.1%), and this suggests a high brittleness index. Organic-matter pores, interparticle pores, intraparticle pores, interlaminated fractures, and structural fractures are all well developed. The porosity ranges from 0.6% to 8.8%, with an average of 4.8%, whereas the permeability varies from 0.0018 to 0.0600 mu D (microdarcy) (averaging 0.0182 mu D). The porosity of TOC- and clay-rich shale samples is generally higher than that of quartz-rich shale samples. The gas adsorption capacity of the Niutitang Shale varies from 2.26 to 4.53 cm3/g, with a mean value of 3.11 cm3/g. The TOC content appears to significantly influence gas adsorption capacity. In general, TOC-rich samples exhibit a much higher adsorption capacity than TOC-poor samples.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 6
Serial Issue: 3
Title: Geologic characterization of a Lower Cambrian marine shale; implications for shale gas potential in northwestern Hunan, south China
Affiliation: Hunan University of Science and Technology, School of Resource, Environment and Safety Engineering, Xiangtan, China
Pages: T635-T647
Published: 201808
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 45
Accession Number: 2019-007389
Categories: Economic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, sketch maps
N28°00'00" - N30°00'00", E109°00'00" - E112°00'00"
Secondary Affiliation: Central South University, CHN, ChinaUniversity of Birmingham, GBR, United KingdomHunan Institute of Engineering, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 2019
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