3D Geomo elling an Flow Simulation of the Late Devonian Bakken Formation in South-Central Saskatchewan - Case Stu y: Smiley Buffalo Heavy Oil Waterfloo

摘要

A sound geological model, a consistent geocellular model, and flow rnsimul tion are all critical components to successful optimization of rna heavy oil waterflood project. Despite the availability of a sound rngeologic model, high quality seismic and abundant core, log, and rnproduction data, optimization of the waterflood project at the Smiley rnBuffalo field in south central Saskatchew naheld many challenges rn rnThe prim ry reservoir at Smiley is the middle Bakken sandstone rnwhich was deposited as offshore sand ridges in late Devonian to rnearly Mississippian time. The reservoir structure has been subjected rnto post depositional solutioning of the underlying Torquay Formation rnand karstification which causes reservoir breaks, fracture networks, rnand irregularities in the saturation functions. These features have rnimportant effects on reservoir performance. The geologic model and rnseismic information were used to construct a consistent structural rnmodel. A facies classification model was built with fuzzy logic which rnused the core and log data as well as the geologic model. Sequential rnindicator simulation was used to popul te the structural model with rnfacies information, and sequential Gaussian simulation was used to rnpopulate the petrophysical properties. Representative models were rnselected for upsc ling and flow simulation and subsequent well rnlocation selection.