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The AAPG/Datapages Combined Publications Database

CSPG Bulletin


Bulletin of Canadian Petroleum Geology
Vol. 39 (1991), No. 4. (December), Pages 315-331

Petroleum Geochemistry and Geology of the Albert Formation Moncton Subbasin, New Brunswick, Canada

Ali H. Chowdhury, Martin G. Fowler, James P.A. Noble


The Stoney Creek oil and gas field of the Moncton Subbasin, southern New Brunswick is the only area of onshore Atlantic Canada to have commercially-produced hydrocarbons. These hydrocarbons are reservoired within the Late Devonian to Early Carboniferous Albert Formation which has previously been shown to contain some intervals with excellent hydrocarbon potential.

In the first part of this study, Rock-Eval pyrolysis, TOC and organic petrography data were used to evaluate 214 fine-grained Albert Formation sediments from different parts of the Moncton Subbasin. These results indicate that good source rocks and potential source rocks (mainly alginite B rich) exist in the vicinity of the Stoney Creek oil and gas field in the northeast, and in the south and southeast of the Subbasin (Albert Mines and Dover areas). Alginite fluorescence, vitrinite reflectance, Tmax and Production Index suggest that organic matter in the area of the oil and gas field and in the Hillsborough area, further south in the Subbasin, have attained sufficient thermal maturity to generate hydrocarbons.

Five crude oils from the Stoney Creek oil and gas field were also analyzed. Gasoline range compositions and biomarker distributions (especially the steranes) indicate that the oils are derived from at least two different source rock facies. Four of the oils show sterane distributions similar to those observed in extracts from Albert Formation samples and are thought to have been locally sourced in the Stoney Creek area. The fifth oil shows some similarities to the other oils but also some important differences including its sterane distribution which is similar to any of the Albert Formation extracts. This oil is either sourced entirely from a different facies of the Albert Formation or it has received a contribution from a different source rock.

A sample of albertite, a solid bitumen that occurs in veins within the Albert Formation in the Albert Mines area, was also examined. This material appears to be early generated hydrocarbons that have migrated a short distance and are locally derived from Albert Formation oil shales.


Le champ de gaz et de petrole de Stoney Creek dans le Moncton Subbasin, New Brunswick meridional, est la seule region du Canada Atlantique terrestre qui contient des hydrocarbures exploites commercialement. Ces hydrocarbures sont contenus dans la formation Albert du Devonien superieur au Carbonifere inferieur, dont l'excellent potentiel d'hydrocarbure de certains intervalles a ete demontre auparavant.

Dans la premiere partie de cette etude, les donnees recueillies par pyrolyse Rock-Eval, carbone organique total et petrographie organique furent utilisees afin d'evaluer 214 sediments fins de la formation Albert provenant de differentes parties du Moncton Subbasin. Ces resultats indiquent que de bonnes roches-meres et des roches-meres potentielles (principalement riches en alginite B) existent dans le voisinage du champ de gaz et de petrole dans le nord-est, ainsi que dans le sud et le sud-est du Subbasin (regions d'Albert Mines et Dover). La fluorescence de l'alginite, la reflectance de la vitrinite, et les valeurs de Tmax et de l'index de production suggerent que la matiere organique dans la region du champ de gaz et de petrole et dans la region de Hillsborough, plus au sud du Subbasin, ont atteint une maturite thermique suffisante pour produire des hydrocarbures.

Cinq huiles brutes du champ de gaz et de petrole de Stoney Creek furent analysees. La variation de la composition d'essence et la distribution des biomarqueurs (particulierement celle des steranes) indiquent que ces huiles sont

1 Contribution to Canada - New Brunswick Mineral Development Agreement, 1985-1989 GSC Contribution 42190

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derivees d'au moins deux facies differents de roches-meres. Quatre des huiles ont des distributions de steranes similaires a celles observees dans les extraits des echantillons de la formation Albert et sont derivees localement dans la region de Stoney Creek. La cinquieme huile possede certaines similarites avec les autres huiles mais aussi des differences importantes incluant sa distribution des steranes qui n'est semblable a aucun des extraits de la formation Albert. Soit cette huile provient entierement d'un facies different dans la formation Albert, soit elle a recu une contribution d'une roche-mere differente.

Un echantillon d'albertite, un bitume solide qui se rencontre en veines dans la formation Albert dans la region d'Albert Mines, fut egalement examine. Cette matiere semble representer des hydrocarbures generes precocement qui ont migre une courte distance et ne sont pas derives localement des schistes bitumineux de la formation Albert.

Traduit par Patrice de Caritat

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