Edson Belly River

Petroleum Geology of the Belly River Formation, Edson Area, Alberta


Summary:
Location: T50-60, R12W5-10W6
Strata: Belly River
Year of Study: 1989


Introduction

An integrated subsurface (geology, petrography, hydrodynamics, geophysics) study of the lower 150 metres of the Belly River Formation in about 2000 wells in the Edson region (Townships 50 to 60, Range 12W5M to the eastern limit of the surface disturbed belt) demonstrates that potentially significant prospects are present.

Slice mapping the Belly River zone reveals an anastomosed pattern of several stacked channel trends can, in part, be carried into surface exposures. The westerly and oldest channel fills are composed of conglomerate and conglomeratic sandstones, whereas eastern and youngest channel fills are dominantly sandy. Primary porosity is abundant in the conglomeratic units, whereas secondary porosity dominates the eastern sandy units

The channel trends traverse a northwest-striking fold and shallow thrust fault belt in the west and are intersected by a northeasterly-oriented fracture network in the east.

The Belly River formation is increasingly underpressured to the west. All significant porosity found in the westernmost and southwesternmost portions of the study area appears to be hydrocarbon saturated, with oil gravities up to 48░ API. In the east, water-bearing units are most common, although several relatively small water-drive medium to light gravity oil reservoirs are potentially present.

The thickest reservoir bodies and major structures are seismically resolvable, especially if short offsets are analyzed. Proper field acquisition parameters are necessary to gain adequate signal-to-noise ratios for Belly River targets without compromising resolution of deeper zones.

Comparison with Belly River geology and reserves located in the Peco/West Pembina area to the south reveals that several specific plays are present in the Pinto, Fickle Lake and Obed areas. Potential discoveries include fields with oil-in-place of up to 100 million barrels; these are likely to be found in the west, where thick porous conglomeratic units are located. In the east, water drive pools with up to 20 million barrels of oil-in-place can be anticipated.

For more information contact:

Leslie Sears
Petrel Robertson Consulting Ltd.
500, 736- 8th Avenue S.W.
Calgary, Alberta
T2P 1H4

Phone: (403) 218-1618
Fax: (403) 262-9135
lsears@petrelrob.com
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