Print this pageAbstract: 
Coal
-Bed
Methane Resources and Reserves of Osage County, Oklahoma
FRIEDMAN, SAMUEL A.
About 100 oil wells
have been "recompleted" in and are producing gas from four Middle Pennsylvanian
bituminous coal beds, 1,200--1,700 feet deep in eastern Osage County since
January 1, 1995. The present study applied the standard method of reliability
to determine coal resources, and thence coal gas resources from geophysical
logs in this county. Cored coal samples and coal-test well data were not
available for accurate resource determination. The geophysical logs were
not originally set up to detect coal not alone thin coal beds one to three
feet thick, thus making coal-bed thickness interpretation a hazardous procedure
with great potential for major errors in coal resource determination and
subsequently in coal-bed methane resource determination.
To avoid the high likelihood
of exaggerated quantities of coal resources, the author restricted the
total area to seven and one-half townships, the number of coals to three
per well in five of these townships, and to two per well in two and one-half
townships. All coal-beds were assumed to be only one foot thick and to
contain only 150 cubic feet of gas per ton of coal.
Thus a minimum of 553 million
tons of coal resources and 83 billion cubic feet of coal-bed methane resources
are estimated to be present in eastern Osage County, Oklahoma.
At a 50% recoverability factor,
there are 41 billion cubic feet of coal
-bed methane reserves present.
AAPG Search and Discovery Article #90944©1997 AAPG Mid-Continent Section Meeting, Oklahoma City, Oklahoma