1995 National Oil and Gas Assessment Continuous-Type Plays within the Uinta - Piceance Basin Province

The purpose of the play map 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.

Continuous oil and gas plays within province 20 (Uinta - Piceance
Basin) are listed here by play number and name:

Number Name
2007 Tight Gas Piceance Mesaverde Williams Fork
2009 Cretaceous Self-Sourced Fractured Shales Oil
2010 Tight Gas Piceance Mesaverde Iles
2015 Tight Gas Uinta Tertiary East
2016 Tight Gas Uinta Tertiary West
2018 Basin Flank Uinta Mesaverde
2020 Deep Synclinal Uinta Mesaverde
2050 Uinta Basin - Book Cliffs
2051 Uinta Basin - Sego
2052 Uinta Basin - Emery
2053 Piceance Basin - White River Dome
2054 Piceance Basin - Western Basin Margin
2055 Piceance Basin - Grand Hogback
2056 Piceance Basin - Divide Creek Anticline
2057 Piceance Basin - Igneous Intrusion