Carbonate reservoirs are characterized by significant heterogeneity at a number of scales, ranging from exploration to production and enhanced production scale. An understanding of how primary depositional facies, diagenesis, and the sequence stratigraphic framework control the development of pores in carbonate rocks, and how the variation in pore architecture influences reservoir permeability is a fundamental process in the accurate characterization of carbonate reservoirs.
In addition, with the ubiquitous use of geostatistical models to define and predict 3-D reservoir architecture in the subsurface, it has become increasingly important to accurately define the probable geometric distribution of potential reservoirs and seals at multiple scales to provide geologically-based, three dimensional reservoir models that can be used to develop dynamic reservoir simulation and flow models. To effectively do this, the challenge is to integrate data on the primary depositional environment (facies, probable geometry, and susceptibility to diagenetic modification), the sequence stratigraphic framework, and the petrophysical characteristics of carbonates at multiple scales utilizing a combination of core, wireline logs, 3D seismic and the incorporation of both modern and ancient analogs.
Examples from the Michigan Basin and other productive basins provide a means to review the controls on carbonate reservoir heterogeneity, ranging from the pore architecture scale to geometrical attributes of flow units at the reservoir-scale, and to discuss how these parameters can be incorporated and integrated into the development of viable, petrophysically-based reservoir models of carbonate reservoirs.
Speaker Dr. G. Michael Grammer, OSU
Dr. G. Michael Grammer is a Professor and Chesapeake Energy Chair of Petroleum Geology Boone Pickens School of Geology at Oklahoma State University. Mike received his PhD in 1991 at the University of Miami’s Rosenstiel School of Marine and Atmospheric Science and has 25+ years of industry related experience in ...
Dr. G. Michael Grammer is a Professor and Chesapeake Energy Chair of Petroleum Geology Boone Pickens School of Geology at Oklahoma State University. Mike received his PhD in 1991 at the University of Miami’s Rosenstiel School of Marine and Atmospheric Science and has 25+ years of industry related experience in carbonate reservoirs, sequence stratigraphy and carbonate reservoir characterization. His current research interests involve the various aspects of high resolution sequence stratigraphy and its application to carbonate reservoir characterization, 3-D modeling and petrophysical characterization. He has been an AAPG Distinguished Lecturer (2002-2003) and has led several AAPG courses, including AAPG’s modern carbonate course in the Bahamas which he co-led for 14 years. He has published extensively on carbonate reservoir characterization issues, including as lead editor of AAPG Memoir 80 “Integration of Outcrop and Modern Analogs in Reservoir Modeling” which won AAPG’s Robert H. Dott Sr. Memorial Award for best special publication in 2006. Mike’s industry-related experience includes senior research positions with Texaco and ChevronTexaco where he functioned as an internal consultant and instructor on carbonate reservoir characterization issues in various parts of the world, most notably with super-giant fields in Kazakhstan. He has consulted, presented short courses and led field trips for AAPG, Nautilus, and Petroskills, as well as numerous domestic and international petroleum companies.