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Hydrocarbon storage space within lacustrine gas shale of the Triassic Yanchang Formation, Ordos Basin, China

Wang Xiangzeng, Zhang Lixia, Jiang Chengfu and Fan Bojiang
Hydrocarbon storage space within lacustrine gas shale of the Triassic Yanchang Formation, Ordos Basin, China (in China shale gas and shale oil plays, Shu Jiang (prefacer), Hongliu Zeng (prefacer), Zhang Jinchuan (prefacer), Neil Fishman (prefacer), Baojun Bai (prefacer), Xiao Xianming (prefacer), Tongwei Zhang (prefacer), Geoffrey Ellis (prefacer), Li Xinjing (prefacer), Bryony Richards-McClung (prefacer), Cai Dongsheng (prefacer) and Ma Yongsheng (prefacer))
Interpretation (Tulsa) (May 2015) 3 (2): SJ15-SJ23


The Triassic Yanchang Formation lacustrine shale is a source of conventional oil accumulation in the Ordos Basin, China. The Yanchang Formation, a hybrid system of organic-rich shale, interbedded silty shale, and siltstone, is believed to be a potential unconventional oil and gas play. Our crossdisciplinary investigation of the storage space included the outcrop description, core observation, thin sections, and scanning electron microscope pore imaging. We evaluated the results from these techniques to reveal that the storage space within the Yanchang Formation shales included primary intergranular pores, secondary generated pores, tectonic fractures, and bedding-parallel fractures. We conducted adsorption experiments, combined with burial and thermal history, in which the primary migration process can be divided into three stages. In the Early Jurassic, organic matter did not reach the oil generation threshold. From the Late Jurassic to the Early Cretaceous, organic matter entered the oil generation window, and gas was generated and stored as adsorbed gas, dissolved gas, and free gas. From the Middle to Late Cretaceous, the storage of shale gas was dynamically transformed by tectonic uplift. Variations in chemical and carbon isotopic compositions from canister-core desorption were directly related to the gas supply in shales. An abrupt decrease in gas dryness and positive d (super 13) C (sub 1) values indicated the depletion of gas supply drainage. Our ultimate recovery factor reached 70%.

ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 3
Serial Issue: 2
Title: Hydrocarbon storage space within lacustrine gas shale of the Triassic Yanchang Formation, Ordos Basin, China
Title: China shale gas and shale oil plays
Author(s): Wang XiangzengZhang LixiaJiang ChengfuFan Bojiang
Author(s): Jiang, Shuprefacer
Author(s): Zeng, Hongliuprefacer
Author(s): Zhang Jinchuanprefacer
Author(s): Fishman, Neilprefacer
Author(s): Bai, Baojunprefacer
Author(s): Xiao Xianmingprefacer
Author(s): Zhang, Tongweiprefacer
Author(s): Ellis, Geoffreyprefacer
Author(s): Li Xinjingprefacer
Author(s): Richards-McClung, Bryonyprefacer
Author(s): Cai Dongshengprefacer
Author(s): Ma Yongshengprefacer
Affiliation: Shaanxi Yanchang Petroleum Company, Research Institute, Shaanxi, China
Affiliation: University of Utah, Energy and Geoscience Institute, Salt Lake City, UT, United States
Pages: SJ15-SJ23
Published: 201505
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 38
Accession Number: 2015-073908
Categories: Economic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Secondary Affiliation: Bureau of Economic Geology, USA, United StatesChina University of Geosciences, CHN, ChinaHess Corporation, USA, United StatesMissouri University of Science and Technology, USA, United StatesChinese Academy of Sciences, Guangzhou Institute of Geochemistry, CHN, ChinaU. S. Geological Survey, USA, United StatesPetroChina, CHN, ChinaChina National Offshore Oil Corporation, CHN, ChinaSinopec, 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: 201532
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