The Big Mountain oil field, Ventura, California

Journal Article · Fri Jun 02 00:00:00 EDT 1967 · AAPG Pacific Sect. Spring Field Trip; (United States)

OSTI ID:5965665

Hall, E A

The Big Mt. oil field is believed to be primarily a fault trap accumulation. All faults are hidden beneath the unconformity at the base of the Vaqueros Formation, or die out before reaching the surface. The Sespe Formation is divided into an upper sandy unit, a middle alternating sand and shale unit, and a lower sandy unit in the Big Mt. area. The producing zone is in the upper portion of the lower sandy unit. The sands are soft and friable, medium to coarse, and the reservoir characteristics are relatively good. The geology is similar to that observed in many Sespe fields, such as the Oxnard and Montalvo oil fields, and the SE. portion of the South Mt. oil field. These fields are broken into many fault blocks and different production characteristics in each block. Good wells and poor ones are interspersed, with good wells downdip from poor ones and visa versa. The Big Mt. field is shallow, drilling and production costs are relatively inexpensive, and there is no royalty burden on the oil.

• Research Organization: Union Oil Co., California
• OSTI ID: 5965665
• Journal Information: AAPG Pacific Sect. Spring Field Trip; (United States), Journal Name: AAPG Pacific Sect. Spring Field Trip; (United States)
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
CALIFORNIA
OIL FIELDS
GEOLOGY
GEOLOGIC FAULTS
OIL WELLS
PRODUCTION
SANDSTONES
STRATIGRAPHY
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
MINERAL RESOURCES
NORTH AMERICA
PETROLEUM DEPOSITS
RESOURCES
ROCKS
SEDIMENTARY ROCKS
USA
WELLS
WESTERN REGION
020200* - Petroleum- Reserves
Geology
& Exploration
020300 - Petroleum- Drilling & Production