Improving Geologic and Engineering Models of Midcontinent Fracture and Karst-Modified Reservoirs Using New 3-D Seismic Attributes Page: 3 of 185
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Our project goal was to develop innovative seismic-based workflows for the incremental
recovery of oil from karst-modified reservoirs within the onshore continental United
States. Specific project objectives were: (1) to calibrate new multi-trace seismic attributes
(volumetric curvature, in particular) for improved imaging of karst-modified reservoirs,
(2) to develop attribute-based, cost-effective workflows to better characterize karst-
modified carbonate reservoirs and fracture systems, and (3) to improve accuracy and pre-
dictiveness of resulting geomodels and reservoir simulations. In order to develop our
workflows and validate our techniques, we conducted integrated studies of five karst-
modified reservoirs in west Texas, Colorado, and Kansas.
Our studies show that 3-D seismic volumetric curvature attributes have the ability to re-
veal previously unknown features or provide enhanced visibility of karst and fracture fea-
tures compared with other seismic analysis methods. Using these attributes, we recognize
collapse features, solution-enlarged fractures, and geomorphologies that appear to be re-
lated to mature, cockpit landscapes. In four of our reservoir studies, volumetric curvature
attributes appear to delineate reservoir compartment boundaries that impact production.
The presence of these compartment boundaries was corroborated by reservoir simulations
in two of the study areas.
Based on our study results, we conclude that volumetric curvature attributes are valuable
tools for mapping compartment boundaries in fracture- and karst-modified reservoirs, and
we propose a best practices workflow for incorporating these attributes into reservoir cha-
racterization. When properly calibrated with geological and production data, these
attributes can be used to predict the locations and sizes of undrained reservoir compart-
Technology transfer of our project work has been accomplished through presentations at
professional society meetings, peer-reviewed publications, Kansas Geological Survey
Open-file reports, Master's theses, and postings on the project website:
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Nissen, Susan; Bhattacharya, Saibal; Watney, W. Lynn & Doveton, John. Improving Geologic and Engineering Models of Midcontinent Fracture and Karst-Modified Reservoirs Using New 3-D Seismic Attributes, report, March 31, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc926268/m1/3/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.