Journal
MARINE AND PETROLEUM GEOLOGY
Volume 88, Issue -, Pages 30-40Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.marpetgeo.2017.08.006
Keywords
MICP; Mudrock; Conformance correction; Compression correction; Porosity; Pore throat size distribution; Permeability
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Funding
- Mudrock Systems Research Laboratory
- Project STARR (State of Texas Advanced Oil and Gas Resource Recovery) at the Bureau of Economic Geology at UT Austin
- Shell International Exploration and Production Inc. through the SUTUR-II project
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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. (C) 2017 Elsevier Ltd. All rights reserved.
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