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Hydrocarbon generation and evolution of the source rocks of the lower Es3 and upper Es4 Members of the Shahejie Formation in the Niuzhuang Sub-sag, Jiyang Depression, Bohai Bay Basin, eastern China

Huang Zhenkai, Li Maowen, Liu Quanyou, Xie Xiaomin, Liu Quanyou, Xie Xiaomin, Liu Peng, Cao Tingting, Jiang Qigui and Li Zhiming
Hydrocarbon generation and evolution of the source rocks of the lower Es3 and upper Es4 Members of the Shahejie Formation in the Niuzhuang Sub-sag, Jiyang Depression, Bohai Bay Basin, eastern China
Interpretation (Tulsa) (November 2018) 6 (4): SN11-SN21

Abstract

Systematic organic petrology and geochemistry analyses have been conducted in the source rocks of the lower Es3 and upper Es4 members of the Shahejie Formation in the Niuzhuang Sub-sag, Jiyang Depression, Bohai Bay Basin, eastern China. The results indicate that the main organic types of shale and nongypsum mudstone in the lower Es3 and upper Es4 member are I-II (sub 1) kerogen, and the predominant (> 8o%) activation energy frequencies range from 57 to 60 Kcal/mol. The similar distribution characteristics in the two source rocks indicate that they have a similar hydrocarbon maturation process. An extensive pyrolysis analysis indicates that the source rocks of the upper Es4 member do not have an obvious double peak hydrocarbon generation model. Previous studies indicate that the hydrocarbon index peak at a depth of 2500-2700 m is affected by migrating hydrocarbon. Major differences are not observed in the hydrocarbon generation and evolution process of the shale and nongypsum mudstone. The primary oil generation threshold of the lower Es3 and upper Es4 members is approximately 3200 m, and the oil generation peak is approximately 3500 m. The activation energy distribution of the gypsum mudstone of the upper Es4 member is wider than that of the shale and nongypsum mudstone, and lower activation energies account for a larger proportion of the activation energies. The above factors may lead to a shallower oil generation threshold for gypsum mudstone compared with that for shale and nongypsum mudstone.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 6
Serial Issue: 4
Title: Hydrocarbon generation and evolution of the source rocks of the lower Es3 and upper Es4 Members of the Shahejie Formation in the Niuzhuang Sub-sag, Jiyang Depression, Bohai Bay Basin, eastern China
Affiliation: SINOPEC, China and Petroleum Exploration and Production Research Institute, State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, China
Pages: SN11-SN21
Published: 201811
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
Accession Number: 2019-007369
Categories: Economic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Special section; Shale oil and gas enrichment mechanisms and effective development
Illustration Description: illus. incl. strat. col., 1 table, geol. sketch maps
N37°00'00" - N37°30'00", E117°30'00" - E118°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 2019
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