Region
United States
62
Colorado
22
Alaska
12
Arctic Ocean
7
Russia (Federation)
7
China
6
Wyoming
6
Mexico, Gulf of
5
Garfield County
4
Gulf Coast (U.S.)
4
Midland Basin (Tex. and N.M.)
4
Texas
4
Argentina
3
Australia
3
California
3
Mexico
3
National Petroleum Reserve
3
North Slope
3
Utah
3
Africa, East
2
East (U.S.)
2
Europe
2
Gulf Coast
2
India
2
La Plata County
2
Marcellus Shale
2
Montezuma County
2
National Petroleum Reserve (Alaska)
2
New Mexico
2
Piceance Creek Basin
2
Poland
2
Powder River Basin (Wyo. and Mont.)
2
San Juan Basin (N.M. and Colo.)
2
Siberia, Western
2
Song Liao Basin
2
South Africa
2
South America
2
Spraberry Formation
2
Texas, West
2
West (U.S.)
2
Adams County
1
Afghanistan
1
Africa, North
1
Africa, Northwest
1
Aleutian Basin
1
Amazonas Basin Province
1
Amu Darya Valley
1
Anadarko Basin
1
Andaman Sea
1
Appalachian Region
1
more ...