A New Gas-Content-Evaluation Method for Organic-Rich Shale Using the Fractionation of Carbon Isotopes of Methane
- Gaohui Cao (Institute of Mechanics, Chinese Academy of Sciences, and School of Engineering Science, University of Chinese Academy of Sciences) | Huanxu Zhang (College of Engineering, Peking University, and Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals, Shandong University of Science and Technology) | Wenbin Jiang (Institute of Mechanics, Chinese Academy of Sciences) | Sheng Wu (Power Environmental Energy Research Institute) | Di Zhu (Energy Research Institute, Qilu University of Technology (Shandong Academy of Science)) | Mian Lin (Institute of Mechanics, Chinese Academy of Sciences, and School of Engineering Science, University of Chinese Academy of Sciences)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- December 2019
- Document Type
- Journal Paper
- 2,574 - 2,589
- 2019.Society of Petroleum Engineers
- shale gas, fractionation, carbon isotopes of methane, gas content evaluation
- 2 in the last 30 days
- 66 since 2007
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Gas content is a key parameter for the determination of the gas resources in unconventional reservoirs. In this study, we propose a novel method to evaluate the gas content of shale through a new perspective: fractionation of carbon isotopes of methane. At first, a bicomponent gas-convection/diffusion/adsorption model (BG-CDAM) is successfully built with consideration of the flow and adsorption difference between 13CH4 and 12CH4 in the nanoporous shale. A detailed understanding of the mechanism of fractionation of the isotopes is obtained for the first time and the Knudsen-diffusivity difference is identified as the dominant factor for fractionation according to the different molecular weights of the isotopes. Then, the simulated results of BG-CDAM and the measured data from an isotope-logging test are combined to determine the unknown parameters for gas-content calculation. The proposed method for organic shale is valid and useful to obtain the quantitative component proportion in gas content, such as lost gas, degassing gas and residual gas, or free gas and adsorption gas. Thus, this method could provide a promising means for the identification of sweet spots in shale-gas reservoirs. Moreover, the method might have the potential to economically and rapidly evaluate the remaining resources in producing wells in future applications.
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