“Jonah Field Area: Seismic Coherency Cube Technology Used to Define Trap Boundaries and Stratigraphic Features”
By Victor H. Vega(1), William B. Hanson(2), Greg Partyka(3), Christopher J. Christensen(4),
and Dennis L. Cox(1).
(1) Rockies PU, BP America Production Company, Houston, TX ,
(2) Consultant, North Plains, OR (3) Upstream Technology Group, BP, Houston, TX,
(4) GOM Shelf BU, BP, Houston, TX
Published in the February, 2002 Bulletin
Figure One
Jonah Gas Field index map.
Figure Two
Type logs for west and east parts of the Jonah Field. See Figure 1 for location of these wells.
Figure Three
Arbitrary 3-D seismic line displaying five key well logs as shown on Figure 2.
This seismic line is oriented generally northeasterly in a dip direction extending from a point
1.7 miles west of Jonah field to the syncline near the eastern down dip extent of Jonah Field.
Total length is approximately 12.1 miles (64,000 feet). Well 1 is directionally drilled along the western
boundary fault of the field. The fault is obscured by the well log overlay. Well number 3 is located near the center of the field and
penetrates the Ericson Formation. Well number 4 is located on the up-thrown side of an important fault and the well log
overlay obscures much of the fault. Well number 5 defines the down dip limit of production as presently known in this area.
Elevations are shown along the side of the seismic line at intervals of 1000 feet.
Stratigraphic horizons are as follows:
FTUN - Fort Union Formation top
TUN - Unnamed Tertiary Unit top
LNCE - Lance Formation top
MVRD -Mesaverde Group top
ERCS - Ericson Formation top
The following stratigraphic units are approximately located:
RKSP - Rock Springs Formation
HLRD - Hilliard Formation, base lies below bottom seismic data
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