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Pore Characterization of Cambay Shale Using Low-pressure Gas Adsorption and MIP Analysis
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
Shale gas is becoming one of the prime targets for future energy. In addition, they can act as potential sinks for carbon dioxide sequestration. Pore size distribution is one of the fundamental aspects of shale gas exploration and the estimation of gas storage potential. The work presented here is one of the first efforts on characterizing an Indian shale gas reservoir based on its pore size distribution. Mercury Injection Porosimetry (MIP) and low-pressure gas adsorption (N2 and CO2) techniques were used to study the nano-scale pore size. The result suggested that the samples exhibited diversified pore size characteristics. The micropores were efficiently accessed using CO2 while N2 was effective on characterizing the mesopore range. MIP analysis was used to infer the pore throat area. Both N2 and CO2 adsorption (Type II and Type I respectively) suggested micropore infilling and exhibited a bimodal distribution of pore sizes. As compared to coal, the pore size accessed by N2 is smaller, indicating a superior connectivity of micro-pores in shales. In CO2 adsorption the pore size ranges are 5–6Å and 10–20Å. Similarly, in case of N2 the pore size range was found to lie below 10Å.