Improving Geologic and Engineering Models of Midcontinent Fracture and Karst-Modified Reservoirs Using New 3-D Seismic Attributes Page: 6 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. Our objectives were (1) to calibrate new 3-D seismic multi-trace attributes (volu-
metric 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 predictiveness
of geomodels by simulating history matches of well performances. 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, making use of complementary
seismic, geological, petrophysical, and engineering data. These reservoir characterization
studies produced the following results:
Permian San Andres, west Texas. 3-D seismic curvature attributes were used to map po-
tential reservoir compartments in Waddell field. Seismic curvature lineaments suggest
reservoir compartmentalization at a single-well scale, an interpretation supported by bulk
volume water (BVW) analysis of wells in the study area. Tracer data indicate that there is
some fluid communication across the lineaments, suggesting that, in this reservoir, the
lineaments may be baffles to fluid flow, rather than no-flow boundaries.
Mississippian, Colorado. 3-D seismic curvature attributes were used to identify compart-
ments in Smoky Creek and Cheyenne Wells fields and to build a geomodel which served
as a basis for simulation to history match production performance of wells located in
these compartments. For most of the wells in the study area, simulation results closely
matched the historically recorded fluid production and pressure data. The 3-D seismic
curvature attributes were then used to identify prospective reservoir compartments for
infill drilling. The field operator, Mull drilling Company, plans to drill one of the identi-
fied infill locations in the Cheyenne Wells field in the late summer of 2009. Match be-
tween observed production performance at this new well with that predicted from simula-
tion studies will help further validate the seismic attribute technique for identifying com-
Ordovician Arbuckle, Russell County, Kansas. Regional geological characterization of
the Arbuckle erosional surface using well data identified areas of groundwater-sapped
plateaus and polygonal karst, which exhibit differences in oil productivity. 3-D seismic
curvature attributes revealed subtle polygonal features that are geomorphically reminis-
cent of polygonal (cockpit) karst but that are smaller than the polygonal karst features
identified using well data. We were unable to determine the reservoir implications of
these subtle polygonal features because we had insufficient petrophysical and production
data available for the wells in the area to conduct a meaningful reservoir simulation.
Mississippian, Ness County, Kansas. 3-D seismic curvature attributes were used to map
compartments bounded by karst-enhanced fractures in Dickman field. Fluid production
was correlated with distance (of the well) from oriented seismic curvature lineaments.
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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/m1/6/: accessed January 23, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.