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http://dx.doi.org/10.22807/KJMP.2020.33.4.419

Surface Milling for the Study of Pore Structure in Shale Reservoirs  

Park, Sun Young (Oil & Gas Research Center, Petroleum & Marine Research Division, Korea Institute of Geoscience and Mineral Resources)
Choi, Jiyoung (Oil & Gas Research Center, Petroleum & Marine Research Division, Korea Institute of Geoscience and Mineral Resources)
Lee, Hyun Suk (Oil & Gas Research Center, Petroleum & Marine Research Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Korean Journal of Mineralogy and Petrology / v.33, no.4, 2020 , pp. 419-426 More about this Journal
Abstract
Understanding the pore structure including pore shape and connectivity in unconventional reservoirs is essential to increase the recovery rate of unconventional energy resources such as shale gas and oil. In this study, we found analysis condition to probe the nanoscale pore structure in shale reservoirs using Focused Ion Beam (FIB) and Ion Milling System (IMS). A-068 core samples from Liard Basin are used to probe the pore structure in shale reservoirs. The pore structure is analyzed with different pretreatment methods and analysis condition because each sample has different characteristics. The results show that surface milling by FIB is effective to obtain pore images of several micrometers local area while milling a large-area by IMS is efficient to observe various pore structure in a short time. Especially, it was confirmed that the pore structure of rocks with high content of carbonate minerals and high strength can be observed with milling by IMS. In this study, the analysis condition and process for observing the pore structure in the shale reservoirs is established. Further studies are needed to perform for probing the effect of pore size and shape on the enhancement of shale gas recovery.
Keywords
Shale; Pore; Focused Ion Beam; Ion Milling System; Field Emission Scanning Electron Microscope;
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