Multi-Zone Project: a
Resource Area Where Multi-Stage Frac Technology May
Commercialize Stacked Low Permeability, Hydrocarbon Saturated Targets
The Goshen Multi-Zone Project is in the northern D-J Basin,
southwestern Goshen County,
Wyoming. It targets a 1200' thick
hydrocarbon-saturated interval from 7800 to 9000 feet deep that includes the Niobrara, Wall Creek, and Muddy formations. The project
concept is to achieve commerciality though hydraulic fracture stimulation and
commingling of multiple marginal zones.
This project lies to the east of the basin axis on the gently dipping
eastern side of the D-J
Basin. It is in an active
hydrocarbon generation cell that locally reaches the gas window. Lithologies and depositional environments range from coarse
clastics in delta fronts and shore faces to open
marine organic shales and carbonates. The common
feature is that all zones within a 1200' interval are tight and hydrocarbon
bearing. Exploration wells between 1955 and 1987 had hydrocarbon shows
throughout the interval, small hydrocarbon recoveries from tests, calculated
pay on logs, and no water. Overlapping “sweet spots” provide multiple targets
for vertical wells.
Contributions to production are anticipated from the Niobrara, Fort Hayes,
Wall Creek, Greenhorn, Graneros, Mowry,
and Muddy formations. Development wells are proposed with three or four
hydraulic frac stages of 250,000 pounds of sand per
stage. Pattern drilling is anticipated on 160 then 80 and 40 acre spacing.
Projected reserves are about 0.75 BCF and 25 MBO per well. Completed well cost
is estimated at $750,000. Wattenberg field is the multi-zone analog.