1995 National Oil and Gas Assessment Conventional Plays within the Los Angeles Basin Province

The purpose of these files is to illustrate the geologic boundary of
the play as defined for the 1995 U.S. National Assessment. The play
was used as the fundamental assessment unit.

The fundamental geologic unit used in the 1995 National Oil and Gas
Assessment was the play, which is defined as a set of known or
postulated oil and or gas accumulations sharing similar geologic,
geographic, and temporal properties, such as source rock, migration
pathways, timing, trapping mechanism, and hydrocarbon type. The
geographic limit of each play was defined and mapped by the geologist
responsible for each province. The play boundaries were defined
geologically as the limits of the geologic elements that define the
play, such as the limits of the reservoir rock, geologic structures,
source rock, and seal lithologies. The only exceptions to this are
plays that border the Federal-State water boundary. In these cases,
the Federal-State water boundary forms part of the play boundary. The
play boundaries were defined in the period 1993-1994.

Conventional oil and gas plays within province 14 (Los Angeles Basin)
are listed here by play number and name:

Number Name
1401 Santa Monica Fault System and Las Cienegas Fault and Block
1402 Southwestern Shelf and Adjacent Offshore State Lands
1403 Newport-Inglewood Deformation Zone and Southwestern Flank
of Central Syncline
1404 Whittier Fault Zone and Fullerton Embayment
1405 Northern Shelf and Northern Flank of Central Syncline
1406 Anaheim Nose
1407 Chino Marginal Basin, Puente and San Jose Hills, and
San Gabriel Valley Marginal Basin