Abstract: Differences between Limestone and Dolomite Reservoir Properties of Swan Hills Ante Creek Pools and Leduc Simonette Pool, West Central Alberta

ROCK, LUC, McGill University, Department of Earth & Planetary Sciences, Montreal, Quebec

This research is focused on the previously unstudied Upper Devonian dolostone Simonette and limestone Ante Creek reservoirs, located in the deep (3250-3500 m) west central Alberta basin. This is one of the few places in the Alberta basin where dolostone and limestone reservoirs can be compared.

Objectives are: (1) Using E-logs and core observations determine the main depositional facies, porosities and depositional sequences; (2) Establish the different diagenetic phases and paragenesis; (3) Analyze the main diagenetic phases for trace elements and C, 0 and Sr isotopes; (4) Determine the relationships of porosity and permeability with respect to degree and type of dolomitization and whether it is controlled by faults and fractures. Plot decreases and increases in porosity for each diagenetic phase; (5) Use fluid inclusions and bitumen character to establish the temperature and burial history; (6) Determine regional trends of dolomitization and fluid flow; (7) Compare the similarities and differences of these reservoirs with adjacent reef complexes.

Methods include: core logging, petrographic and geochemical analyses of rock samples, vitrinite reflectance of bitumen samples, core porosity and permeability data, E-logs, and petrophysical calculations using GeoGraphix software PRIZM.

The main goal of this research is to determine what controls porosity and permeability in limestone and dolomite reservoirs, so that these factors can be predicted elsewhere.

AAPG Search and Discovery Article #90931©1998 AAPG Foundation Grants-in-Aid