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Geologic evaluation of critical production parameters for coalbed methane resources. Part 1. San Juan Basin. Annual report, August 1987-July 1988

Technical Report ·
OSTI ID:6112145
; ; ; ;
Thick Fruitland coal seams formed landward of Pictured Cliff shoreline sandstones as a result of a stillstand caused by subsidence along the San Juan Basin axis. Both Fruitland coal seams and upper Pictured Cliffs sandstones are elongate to the northwest, favoring fluid movement from that direction. Regional studies show two distinct hydrologic areas in the Fruitland Formation in the south region. Ground-water flow from both areas converges toward the San Juan River as the river exits the basin to the west. The transition from overpressuring to under-pressuring is marked by steepening of the potentiometric surface coincident with south-west pinch-out of thick coal seams and Pictured Cliffs sandstone tongues. Coalbed methane is produced from overpressured and underpressured Fruitland coal seams, and Fruitland coal seams and sandstones are in hydraulic communication.
Research Organization:
Texas Univ., Austin (USA). Bureau of Economic Geology
OSTI ID:
6112145
Report Number(s):
PB-89-142574/XAB
Country of Publication:
United States
Language:
English

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