1995 National Oil and Gas Assessment 1/4-Mile Cells within the Los Angeles Basin Province

The purpose of the cell map is to display the exploration maturity,
type of production, and distribution of production in quarter-mile
cells in each of the oil and gas plays and each of the provinces
defined for the 1995 U.S. National Oil and Gas Assessment.

Cell maps for each oil and gas play were created by the USGS as a
method for illustrating the degree of exploration, type of production,
and distribution of production in a play or province. Each cell
represents a quarter-mile square of the land surface, and the cells
are coded to represent whether the wells included within the cell are
predominantly oil-producing, gas-producing, both oil and
gas-producing, or dry. The well information was initially retrieved
from the Petroleum Information (PI) Well History Control System
(WHCS), which is a proprietary, commercial database containing
information for most oil and gas wells in the U.S. Cells were
developed as a graphic solution to overcome the problem of displaying
proprietary WHCS data. No proprietary data are displayed or included
in the cell maps. The data from WHCS were current as of December 1990
when the cell maps were created in 1994.

Oil and gas plays within province 14 (Los Angeles Basin) are listed
here by play number, type, and name:

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