Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Study on the distribution of extractable organic matter in pores of lacustrine shale; an example of Zhangjiatan Shale from the Upper Triassic Yanchang Formation, Ordos Basin, China

Yu Yuxi, Luo Xiaorong, Cheng Ming, Lei Yuhong, Wang Xiangzeng, Zhang Lixia, Jiang Chengfu and Zhang Likuan
Study on the distribution of extractable organic matter in pores of lacustrine shale; an example of Zhangjiatan Shale from the Upper Triassic Yanchang Formation, Ordos Basin, China
Interpretation (Tulsa) (May 2017) 5 (2): SF109-SF126

Abstract

Shale oil and gas have been discovered in the lacustrine Zhangjiatan Shale in the southern Ordos Basin, China. To study the distribution of extractable organic matter (EOM) in the Zhangjiatan Shale (R (sub o) ranges from 1.25% to 1.28%), geochemical characterization of core samples of different lithologies, scanning electron microscope observations, low-pressure N (sub 2) and CO (sub 2) adsorption, and helium pycnometry were conducted. The content and saturation of the EOM in the pores were quantitatively characterized. The results show that the distribution of the EOM in the shale interval is heterogeneous. In general, the shale layers have a higher EOM content and saturation than siltstone layers. The total organic content and the original storage capacity control the EOM content in the shale layers. For the siltstone layers, the EOM content is mainly determined by the original storage capacity. On average, 75% of the EOM occurs in the mesopores, followed by 14% in the macropores, and 11% in the micropores. The EOM saturation in the pores decreases with the increase in pore diameter. The distribution of EOM in the shale pores is closely related to the pore type. Micropores and mesopores developed in the kerogens and pyrobitumens and the clay-mineral pores coated with organic matter are most favorable for EOM retention and charging.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 5
Serial Issue: 2
Title: Study on the distribution of extractable organic matter in pores of lacustrine shale; an example of Zhangjiatan Shale from the Upper Triassic Yanchang Formation, Ordos Basin, China
Affiliation: Chinese Academy of Sciences, Institute of Geology and Geophysics, Beijing, China
Pages: SF109-SF126
Published: 201705
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 59
Accession Number: 2017-069973
Categories: Economic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. chart, strat. col., 4 tables, sketch map
N32°00'00" - N36°00'00", E108°00'00" - E116°00'00"
Secondary Affiliation: Shaanxi Yanchang Petroleum Company, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201737
Close Modal

or Create an Account

Close Modal
Close Modal