Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (6): 1645-1653.doi: 10.13278/j.cnki.jjuese.20170173

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Quantitative Method of Crushed Gas in Shale and Its Geological Significance

Wang Taoli1,2, Wang Qingtao1, Liu Wenping3,4, Lu Hong1, Liu Dayong1   

  1. 1. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Exploration and Development Institute of Southwest Oil & Gas Field Company, PetroChina, Chengdu 610051, China;
    4. Sichuan Province Key Laboratory of Shale Gas Evaluation & Exploitation, Chengdu 610051, China
  • Received:2017-06-21 Published:2018-11-26
  • Supported by:
    Supported by National Natural Science Foundation of China (41602130), Natural Science Foundation of Guangdong Province (2016A030310116), Strategic Priority Research Program of the Chinese Academy of Sciences (Class B) (XDB10010501), and Strategic Priority Research Program of the Chinese Academy of Sciences (Class A) (XDA14010102)

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Abstract: A device was designed and manufactured to release the crushed gas in shales under vacuum. The gas from this device was geochemically and quantitatively analyzed by the device combined with the enrichment module and gas chromatography. Meanwhile, the comprehensive chemical composition and the stable carbon isotopic composition were obtained through analyzing the gas sealed in the glass tube. With the mixed standard gases calibrating, the correlation coefficient between concentrations of organic and inorganic gases and gas chromatographic response reached 0.999, which indicates that the device is stable for a quantitative analysis of the crushed gas. The result showed a good parallelism between the gas yields and stable carbon isotope values when the different outcrop shales (the Lower Silurian Longmaxi Formation in Xishui County, Guizhou, the Lower Cambrian Niutitang Formation in Mufu Mountain, Nanjing and Upper Triassic Yanchang Formation in Yan'an, Shaanxi) were analyzed, and reported the chemical and stable carbon isotopic compositions of the crushed gases of the core samples from the Lower Silurian Longmaxi Formation, southern Sichuan basin. The results revealed that the crushed gases are mainly inorganic gases (N2 and CO2) with a little hydrocarbon gas that are mainly composed of CH4 and extremely low content of C2H6 and C3H8. The δ13C1 values of crushed gas range from -38.1‰ to -33.9‰ with a mean value of -35.8‰, which is similar to the value of shale gas in the same area proposed by previous studies. In addition, the crushed gas of shale at low depths of (20-46) m showed a weakly positive relationship between the yield of crushed gas and w(TOC) values/carbonate content, while a negative correlation between the yields of crushed gas with DFT surface area and BJH pore volume. This suggests that the commercial shale gas is possibly originated from the Lower Silurian Longmaxi Formation, corresponding to the strict definition of shale gas. Hence, the crushed gases are neither adsorbed nor dissociated in shale gas reservoir, but sealed up in the enclosed pores in shales.

Key words: crushed gas, quantitative, gas source, stable carbon isotope, shale gas

CLC Number: 

  • P593
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