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Titre du document / Document title

Coalbed methane, Cook Inlet, south-central Alaska: A potential giant gas resource

Auteur(s) / Author(s)

MONTGOMERY Scott L. ; BARKER Charles E. (2) ; SEAMOUNT Dan ; DALLEGGE Todd A. ; SWENSON Robert F. ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(2) U.S. Geological Survey, Box 25046, MS 977, Denver Federal Center, Denver, Colorado 80225, ETATS-UNIS

Résumé / Abstract

Cook Inlet Basin of south-central Alaska is a fore are basin containing voluminous Tertiary coal deposits with sufficient methane content to suggest a major coalbed gas resource. Coals ranging in thickness from 2 to 50 ft (0.6 to 15 m) and in gas content from 50 to 250 scf/ton (1.6 to 7.8 cm2/g) occur in Miocene-Oligocene fluvial deposits of the Kenai Group. These coals have been identified as the probable source of more than 8 tef gas that has been produced from conventional sandstone reservoirs in the basin. Cook Inlet coals can be divided into two main groups: (1) those of bituminous rank in the Tyonek Formation that contain mainly thermogenic methane and are confined to the northeastern part of the basin (Matanuska Valley) and to deep levels elsewhere; and (2) subbituminous coals at shallow depths (<5000 ft [1524 m]) in the Tyonek and overlying Beluga formations, which contain mainly biogenic methane and cover most of the central and southern basin. Based on core and corrected cuttings-desorption analyses, gas contents average 230 scf/ton (7.2 cm2/g) for bituminous coals and 80 scf/ton (2.5 cm2/g) for subbituminous coals. Isotherms constructed for samples of both coal ranks suggest that bituminous coals are saturated with respect to methane, whereas subbituminous coals at shallow depths along the eroded west-central basin margin are locally unsaturated. A preliminary estimate of 140 tcf gas in place is derived for the basin.

Revue / Journal Title

AAPG bulletin    ISSN  0149-1423   CODEN AABUD2 

Source / Source

2003, vol. 87, no1, pp. 1-13 [13 page(s) (article)] (28 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Association of Petroleum Geologists, Tulsa, OK, ETATS-UNIS  (1974) (Revue)

Mots-clés anglais / English Keywords

clastic rocks

;

Paleogene

;

upper Tertiary

;

Neogene

;

sedimentary rocks

;

carbonaceous rocks

;

coal

;

Phanerozoic

;

Cenozoic

;

North America

;

United States

;

reserves

;

vitrinite

;

reflectance

;

fluvial environment

;

fore-arc basins

;

natural gas

;

bituminous coal

;

rank

;

reservoirs

;

sandstone

;

Oligocene

;

Miocene

;

thickness

;

subbituminous coal

;

Tertiary

;

coalbed methane

;

Cook Inlet

;

Alaska

;

Mots-clés français / French Keywords

Roche clastique

;

Paléogène

;

Tertiaire sup

;

Néogène

;

Roche sédimentaire

;

Roche carbonée

;

Charbon

;

Phanérozoïque

;

Cénozoïque

;

Amérique du Nord

;

Etats Unis

;

Réserve

;

Vitrinite

;

Pouvoir réflecteur

;

Milieu fluviatile

;

Bassin avant arc

;

Gaz naturel

;

Charbon bitumineux

;

Degré houillification

;

Réservoir

;

Grès

;

Oligocène

;

Miocène

;

Epaisseur

;

Charbon subbitumineux

;

Tertiaire

;

Méthane couche charbon

;

Détroit Cook

;

Alaska

;

Mots-clés espagnols / Spanish Keywords

Roca clástica

;

Paleógeno

;

Neógeno

;

Roca sedimentaria

;

Roca carbonosa

;

Carbón

;

Fanerozoico

;

Cenozoico

;

America del norte

;

Estados Unidos

;

Reserva

;

Vitrinita

;

Poder reflector

;

Medio fluviatil

;

Cuenca marginal externa

;

Gas natural

;

Carbón bituminoso

;

Grado hullificación

;

Gres

;

Oligoceno

;

Mioceno

;

Espesor

;

Terciario

;

Estrecho Cook

;

Alaska

;

Localisation / Location

INIST-CNRS, Cote INIST : 3085, 35400010374263.0010

Nº notice refdoc (ud4) : 14470586



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