1995 National Oil and Gas Assessment 1/4-Mile Cells within the San Joaquin 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 10 (San Joaquin Basin) are listed
here by play number, type, and name:

Number Type Name
1001 conventional Pliocene Non-associated Gas
1002 conventional Southeast Stable Shelf
1003 conventional Lower Bakersfield Arch
1004 conventional West Side Fold Belt Sourced by Post-Lower Miocene Rocks.
1005 conventional West Side Fold Belt Sourced by Pre-Middle Miocene Rocks
1006 conventional Northeast Shelf of Neogene Basin
1007 conventional Northern Area Non-associated Gas
1008 conventional Tejon Platform
1009 conventional South End Thrust Salient
1010 conventional East Central Basin and Slope North of Bakersfield Arch
1011 conventional Deep Overpressured Fractured Rocks of West Side
Fold and Overthrust Belt