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Modern 3D Previous HitInterpretationNext Hit of a Mature, Structurally-Complex Oil Field: Whittier Field, Los Angeles Basin, California, USA


Scheevel, Jay1, Michael McCaskey2, Jason Byl3 (1) Scheevel Geo Technologies LLC, Grand Junction, CO (2) Matrix Oil Corp, Santa Barbara, CA, (3) Byl Consulting,


The Whittier field is one of many aging Los Angeles Basin fields. The reservoir section consists of deep-water turbidites both channelized and amalgamated fans. The field was developed with cable-tool, then rotary vertical drilling (no logs), then with rotary directionally drilling (logged using modern wireline tools). The wireline data combined with limited data from older wells provides the control set for our complete 3D model study.


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 Previous HitinterpretationNext Hit. 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 Previous HitinterpretationNext Hit environment. Well correlation using bedding-parallel foreshortened views enables accurate true Previous HitstratigraphicNext Hit 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 Previous HitstratigraphicNext Hit grids. Geostatistical and probabilistic modeling of rock-type consistent with paleodepositional trends were performed on these Previous HitstratigraphicTop 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