Application of mercury injection capillary pressure to mudrocks: Conformance and compression corrections |
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| Institution: | 1. Department of Geology, Saint Mary''s University, Halifax, Nova Scotia, B3H 3C3, Canada;2. Universidade Federal Rural Do Rio de Janeiro, Seropédica, Rio de Janeiro, Brazil;3. Natural Resources Canada, Geological Survey of Canada (Atlantic), Bedford Institute of Oceanography, Dartmouth, Nova Scotia, B2Y 4A2, Canada;1. Oil & Gas Research Centre, Sultan Qaboos University, P.O. Box 17, P.C. 123, Al-Khoud, Muscat, Oman;2. Petroleum Development of Oman, Oman;1. School of Geosciences, China University of Petroleum, Qingdao, Shandong 266580, China;2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;3. Department of Geosciences, University of Oslo, P.O. Box 1047, Blindern 0316, Oslo, Norway;4. Research Institute of Petroleum Exploration & Development, Beijing 100083, China |
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| Abstract: | Mercury injection capillary pressure (MICP) is a commonly-used technique for measurements of porosity, pore throat size distribution, and injection pressure vs. mercury saturation for many types of rocks. The latter two are correlated to and can be used to estimate permeability. Problems for MICP application in mudrocks are associated with two types of system errors: conformance and compression effects. These two sources of error are well-recognized, but no standard procedures to correct them exist. In this study, a new method for conformance and compression corrections was developed, and the method applied to five Eagle Ford Shale samples. Conformance correction is based on comparison of mercury injection volume vs. pressure curves between epoxy-coated and uncoated samples. Compression correction is based on calculation of compressions before and after mercury intrusion in MICP experiment. Different types of compressions are quantified and compression corrections on porosity, pore throat size distribution, and injection pressure vs. mercury saturation are performed. Porosity and permeability were calculated based on corrected MICP data. Results show that both conformance and compression corrections are important for accurate MICP porosity calculation, whereas conformance correction is more important than compression correction in permeability calculation. |
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| Keywords: | MICP Mudrock Conformance correction Compression correction Porosity Pore throat size distribution Permeability |
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