Abstract: New Developments at Beta
Field, San Pedro Bay
MILTON, J., D., Aera Energy LLC, Bakersfield, California
Beta
Field is located nine miles offshore from Orange County, California
in the Federal Waters of San Pedro Bay. Discovered in 1975,
Beta
has produced
in excess of 73 MMBO and currently averages between 8000 and 9000 BOPD
from 65 wells.
Over 15 delineation tests were drilled before the first platform was set in late 1980. By the mid-1980's three more platforms had been set in water depths ranging from 180' to over 700'. Of the four plafforms, three (including one platform dedicated to facilities) are set on Aera's (formerly Shell's) southerly P-0300 and P-0301 leases. Dry oil is shipped to refineries in the Long Beach area. Produced water is reinjected into the formation for pressure maintenance.
Beta
produces oil and gas from turbidite sands of Delmontian Age. The
hydrocarbon reservoir sits directly below the Repetto/Delmontian unconformity
and averages 400 feet in net thickness. The six distinct sand members average
a combined sand/shale ratio of 40%. The 1500-aue accumulation is trapped
against the Palos Verdes Fault complex and is compartmentalized by smaller
faults into eight major unique reservoirs. Ironically, oil quality increases
to the northeast while sand quality increases to the southwest.
Over the past several years, redevelopment has sporadically continued
with the use of horizontal wells, infills, aggressive directional plans
and conservative replacement wells. New drilling and completion techniques
have in some cases improved productivity but also induced sand control
and impairment problems. Efforts continue to understand the production
disparity between areas of the field with similar reservoir characteristics.
AAPG Search and Discovery Article #90935©1998 AAPG Pacific Section Meeting, Ventura, California