Modern 3D
Interpretation of a Mature, Structurally-Complex Oil Field: Whittier Field,
Scheevel, Jay1,
Michael McCaskey2, Jason Byl3 (1) Scheevel
Geo Technologies LLC, Grand Junction, CO (2) Matrix Oil Corp,
The
The structural geometry is very difficult
to interpret from logs alone because of vertical and overturned beds. Log
signatures vary wildly with the wide range of penetration angles relative to
bedding. Lateral variations in stratigraphy further
complicate interpretation. Because of these difficulties, historical
development has been based on a strategy of offsetting successful wells along
strike.
Our study integrates log data, surface
mapping, surface and subsurface dip data and hydrocarbon indicators into a 3D
volume interpretation environment. Well correlation using bedding-parallel
foreshortened views enables accurate true stratigraphic
thickness correlations. Translation of surfaces conforming to dip control and
perpendicular to layering (pseudo-concentric construction) aids construction of
the faulted, near vertical and overturned footwall structures.
Horizons modeled in 3D were used to
construct layered stratigraphic grids. Geostatistical and probabilistic modeling of rock-type
consistent with paleodepositional trends were
performed on these stratigraphic grids.
The resulting integrated 3D model reveals
that the trapping of hydrocarbons in both the hanging wall and the footwall, is
controlled by both stratigraphy and fault truncation.
Further development drilling is planned to directly target stranded oil pay
predicted from the integrated model.
AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California