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Pore structure of the Cretaceous lacustrine shales and shale-oil potential assessment in the Songliao Basin, northeast China

Zeng Weizhu, Zhou Guoyi, Cao Taotao and Song Zhiguang
Pore structure of the Cretaceous lacustrine shales and shale-oil potential assessment in the Songliao Basin, northeast China
Interpretation (Tulsa) (February 2021) 9 (1): T21-T33

Abstract

Aiming to study the pore structure and its impact on shale oil enrichment, a total of nine lacustrine shales (including one immature shale and eight mature shales) from the Qingshankou Formation in the Songliao Basin were subjected to low-pressure gas sorption (LPGS) of CO (sub 2) and N (sub 2) and mercury intrusion capillary pressure (MICP) measurements. The combination of the LPGS and MICP methods demonstrates that the pore volumes of these shales are mainly associated with mesopores, whereas the micropores and macropores are relatively undeveloped. The correlation between the shale compositions and pore volumes of LPGS suggests that the micropores and mesopores are mainly contributed by illite/smectite mixed layer mineral. On the contrary, we have found that the oil/bitumen and carbonates could occupy the micropores and mesopores, respectively, and reduce these pore volumes significantly. The oil saturation index (OSI) was found to display a positive correlation with the maturity Ro value in the range of 0.37%-1.24%, and this may suggest that the shale-oil content is controlled by hydrocarbon generation. However, the pore structure also exerts a great influence on the shale oil enrichment. We suggested that the porosity of MICP could be considered as an index for appraising the shale-oil potential of a given shale player because there is a good positive correlation between the porosity of MICP and the OSI value. Furthermore, a negative correlation between the micropore volume and the OSI value may imply that the shale oil could be adsorbed in micropores, whereas a good positive correlation between the OSI value and the Hg-retained ratio suggests that shale oil is a kind of residual hydrocarbon, which is closely related with the mesopore volume of these shales.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 9
Serial Issue: 1
Title: Pore structure of the Cretaceous lacustrine shales and shale-oil potential assessment in the Songliao Basin, northeast China
Affiliation: Chinese Academy of Sciences, Guangzhou Institute of Geochemistry, Laboratory of Organic Geochemistry, Beijing, China
Pages: T21-T33
Published: 202102
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 47
Accession Number: 2021-011695
Categories: Economic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map, 3 tables, strat. col.
N46°00'00" - N47°00'00", E125°00'00" - E126°00'00"
Secondary Affiliation: Hunan University of Science and Technology, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, 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: 2021
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