AzimMod: Method to honor channel directionality when building 3-D petrophysical models |
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| Affiliation: | 1. Department of General Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Poland;2. Institute of Biophysics and Cell Engineering of NASB, Minsk, Belarus;1. College of Computer Science and Technology, Shanghai University of Electric Power, Shanghai, 200090, China;2. College of Engineering, Shanghai Polytechnic University, Shanghai, 201209, China;1. Shanghai Key Laboratory of Data Science, School of Computer Science, Fudan University, Shanghai, China;2. Department of Computer Science, Brandeis University, Waltham, MA 02453, USA;3. Harvard Medical School, Boston, MA 02120, USA;4. Institute for Data Industry, Fudan University, Shanghai, China;1. Université de Lorraine, CNRS, GeoRessources, 54000 Nancy, France;2. Equinor ASA, 4035 Stavanger, Norway;1. Department of Mathematics and Theories, Peng Cheng Laboratory, Shenzhen 518000, China;2. Department of Energy Science and Engineering, Stanford University, 367 Panama St, Stanford, CA 94305, USA;3. Eastern Institute for Advanced Study, Eastern Institute of Technology, Ningbo, Zhejiang 315200, China;4. National Center for Applied Mathematics Shenzhen (NCAMS), Southern University of Science and Technology, Shenzhen 518000, China;5. BIC-ESAT, ERE, and SKLTCS, College of Engineering, Peking University, Beijing 100871, China |
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| Abstract: | Object-based (or Boolean) methods are used to create channels, bars, splays, or other features to model the distribution of facies in a reservoir. Geologic objects and their facies subsequently are used as templates to control the distribution of petrophysical and lithologic properties. Channels do not flow in a single direction or azimuth, but may meander or have different azimuths, so properties within them should not be aligned in a single direction or azimuth. Hence, standard geostatistical modeling methods, which assume a single azimuth, are not appropriate. This paper describes a process to assign petrophysical properties with continuity aligned parallel to the orientation of channels or bodies, regardless of their varying azimuths. The general process (1) transforms the coordinate system to one in which a channel is straight and can be modeled with geostatistical methods using a constant azimuth, (2) relates the geostatistical calculations to objects and facies, and (3) returns the petrophysical properties to the original, variable-azimuth coordinate system. |
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