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Southwestern Williston Basin Margin

The three prospects on the southwestern margin of the Williston Basin are all located near West Short Pine Hills and Cady Creek Fields in southern Harding County and northern Butte County, South Dakota. Cumulative production from these two fields provide the basis for reserve estimates for these three prospects.

PROSPECT SW-ONE

Geologic Aspects
••Gas system = migrated, early generation biogenic gas.
••Reservoir = conventional sandstone in Cretaceous Shannon SS.
••Trap = buoyancy trap on faulted anticline.
••Depth < 2000 feet.
••Area = 6400 acres.

Economic Aspects
••Reserve estimate = 10 - 24 BCF.
••Distance to pipeline < 3 miles.
••Leases = farmout to be negotiated.
••Availability = immediate.

PROSPECT SW-TWO

Geologic Aspects
••Gas system = migrated, early generation biogenic gas.
••Reservoir = conventional sandstone in Cretaceous Shannon SS.
••Trap = buoyancy trap on faulted anticline.
••Depth < 2000 feet.
••Area = 5120 acres.

Economic Aspects
••Reserve estimate = 8-20 BCF.
••Distance to pipeline < 3 miles.
••Leases = farmout to be negotiated.
••Availability = immediate.

PROSPECT SW-THREE

Geologic Aspects
••Gas system = migrated and in situ, early generation biogenic gas.
••Reservoirs = conventional sandstone and unconventional interbedded sandstone and shale in Cretaceous Shannon/Eagle.
••Traps = buoyancy trap and possible capillary traps on three contiguous fault blocks.
••Depth < 1500 feet.
••Area > 35,000 acres.

Economic Aspects
••Reserve estimate = 50-130 BCF.
••Distance to pipeline > 10 miles.
••Leases = relatively open and inexpensive.
••Availability = immediate.



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