CUMMING, EARL W., Shell Western E&P Inc., Bakersfield, CA

ABSTRACT: 2-D Seismic Interpretation of the Puente Formation Structure Upper Main Zone Waterflood Project, Huntington Beach Field, Orange County, California

A recent offshore 2-D seismic interpretation of the Miocene Puente Formation at Huntington Beach field has identified several previously unknown "oblique" strike-slip faults within the productive limits of the field. These faults will have a significant impact on the ultimate design and well placement of a proposed Upper Main Waterflood Project.

The Upper Main accumulation at Huntington Beach field is dominated by a plunging asymmetrical anticline. The anticline is transected by several oblique right-lateral strike-slip faults that dip 60 degrees and generally have a strike perpendicular to the anticlinal crest.

The Upper Main sands were deposited as deep marine turbidites that pinch out on the updip portion of the anticline. The reservoir is at a subsea depth of 3500 ft and has been separated into two distinct packages. The UM1 zone is a distal turbidite package, and the underlying UM3 zone is a "supra" or "mid-fan" turbidite package. Both zones have good permeability (25-100 md) and porosity (0.25).

AAPG Search and Discovery Article #90992©1993 AAPG Pacific Section Meeting, Long Beach, California, May 5-7, 1993.