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Combining Isotopic Geochemical Data and Logging Data to Predict the Range of the Total Gas Content in Shale: A Case Study from the Wufeng and Longmaxi Shales in the Middle Yangtze Area, South China

  • Ziyi Liu
    Ziyi Liu
    State Key Laboratory of Petroleum Resources and Prospecting  and  College of Geosciences, China University of Petroleum, Beijing 102200, China
    More by Ziyi Liu
  • Dongxia Chen*
    Dongxia Chen
    State Key Laboratory of Petroleum Resources and Prospecting  and  College of Geosciences, China University of Petroleum, Beijing 102200, China
    *E-mail: [email protected]
    More by Dongxia Chen
  • Jinchuan Zhang
    Jinchuan Zhang
    Key Laboratory of Shale Gas Exploration and Evaluation (Ministry of Land and Resources), China University of Geosciences (Beijing), Beijing 100083, China
  • Xiuxiang Lv
    Xiuxiang Lv
    State Key Laboratory of Petroleum Resources and Prospecting  and  College of Geosciences, China University of Petroleum, Beijing 102200, China
    More by Xiuxiang Lv
  • Wei Dang
    Wei Dang
    School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an 710065, China
    More by Wei Dang
  • Yang Liu
    Yang Liu
    Key Laboratory of Shale Gas Exploration and Evaluation (Ministry of Land and Resources), China University of Geosciences (Beijing), Beijing 100083, China
    More by Yang Liu
  • Wenhao Liao
    Wenhao Liao
    State Key Laboratory of Petroleum Resources and Prospecting  and  College of Geosciences, China University of Petroleum, Beijing 102200, China
    More by Wenhao Liao
  • Jinheng Li
    Jinheng Li
    State Key Laboratory of Petroleum Resources and Prospecting  and  College of Geosciences, China University of Petroleum, Beijing 102200, China
    More by Jinheng Li
  • Ziyi Wang
    Ziyi Wang
    State Key Laboratory of Petroleum Resources and Prospecting  and  College of Geosciences, China University of Petroleum, Beijing 102200, China
    More by Ziyi Wang
  • , and 
  • Fuwei Wang
    Fuwei Wang
    State Key Laboratory of Petroleum Resources and Prospecting  and  College of Geosciences, China University of Petroleum, Beijing 102200, China
    More by Fuwei Wang
Cite this: Energy Fuels 2019, 33, 11, 10487–10498
Publication Date (Web):October 1, 2019
https://doi.org/10.1021/acs.energyfuels.9b01879
Copyright © 2019 American Chemical Society
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Abstract

The marine shales of the lower Silurian Longmaxi formation (S1l) and the upper Ordovician Wufeng formation (O3w) in the middle Yangtze area of southern China have been recognized as effective gas shales with an enormous potential. To estimate the total gas content in the shales, shale gas samples were collected at 20 °C, 48 °C/65 °C, and 90 °C in the gas release process of each core sample during desorption experiments. Based on the isotope fractionation data during the desorption of gas in shale, an adsorbed gas content(mixture gas)/free gas content(mixture gas) to δ13C1(mixture gas) model was established to estimate the proportions of free and adsorbed gas in shale by using the δ13C1 data of shale gas. The proportion of adsorbed gas(mixture gas) in the Wufeng shales is higher than that in the Longmaxi gas shales. The adsorption capacity of the Wufeng shales with relatively high total organic carbon (TOC) is greater than that of the Longmaxi shales with a relatively low TOC. Subsequently, the free gas content and the adsorbed gas content could be calculated during the desorption experiments. Combining the free gas and adsorbed gas estimated from the logging data, we calculated the minimum and maximum total gas contents of each core sample from well LY1. The total gas content in the Wufeng shales, ranging from 1.654 to 3.371 m3/t, is higher than that of the Longmaxi shales, ranging from 0.398 to 1.769 m3/t. Compared with the minimum and maximum total gas contents predicted by the isotopic geochemical data and logging data, the value of the total gas content estimated by using the United States Bureau of Mines method is not always located within the range of the total gas content, which is influenced by the relationship between free gas(logging data) (m3/t) and free gas(measured gas) (m3/t).

Cited By

This article is cited by 6 publications.

  1. Chuanxiang Sun, Haikuan Nie, Wei Dang, Qian Chen, Guangrong Zhang, Wangpeng Li, Zhiyuan Lu. Shale Gas Exploration and Development in China: Current Status, Geological Challenges, and Future Directions. Energy & Fuels 2021, 35 (8) , 6359-6379. https://doi.org/10.1021/acs.energyfuels.0c04131
  2. Yang Liu, Eva E. Stüeken, Dongsheng Wang, Xuan Tang, Haikuan Nie, Wei Dang, Jinchuan Zhang. A potential linkage between excess silicate-bound nitrogen and N2-rich natural gas in sedimentary reservoirs. Chemical Geology 2022, 223 , 120864. https://doi.org/10.1016/j.chemgeo.2022.120864
  3. Longfei Xu, Yishan Cheng, Jinchuan Zhang, Wei Dang, Yang Liu, Xuan Tang, Jialiang Niu, Zhongzheng Tong. Origin and isotopic fractionation of shale gas from the Shanxi Formation in the southeastern margin of Ordos Basin. Journal of Petroleum Science and Engineering 2022, 208 , 109189. https://doi.org/10.1016/j.petrol.2021.109189
  4. Debanjan Chandra, Vikram Vishal, Jitendra Bahadur, Debasis Sen. A novel approach to identify accessible and inaccessible pores in gas shales using combined low-pressure sorption and SAXS/SANS analysis. International Journal of Coal Geology 2020, 228 , 103556. https://doi.org/10.1016/j.coal.2020.103556
  5. Zhipeng Chen, Lei Chen, Gaocheng Wang, Chen Zou, Shu Jiang, Zhiwei Si, Wei Gao. Applying isotopic geochemical proxy for gas content prediction of Longmaxi shale in the Sichuan Basin, China. Marine and Petroleum Geology 2020, 116 , 104329. https://doi.org/10.1016/j.marpetgeo.2020.104329
  6. Alexei V. Milkov, Mohinudeen Faiz, Giuseppe Etiope. Geochemistry of shale gases from around the world: Composition, origins, isotope reversals and rollovers, and implications for the exploration of shale plays. Organic Geochemistry 2020, 143 , 103997. https://doi.org/10.1016/j.orggeochem.2020.103997

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