A comprehensive laboratory and in situ rock mechanics test program was carried out in order to provide geotechnical information for the optimum location and design of an underground oil storage facility at a newly proposed thermal generating station. 'Ibis project, situated at Wesleyville, Ontario, sane 90 miles east of Toronto on the north shore of Lake Ontario, was intended for the storage of both residual and crude oil types. The test program included a complete examination of rock cores in the laboratory by determining their petrophysical, geochemical, geophysical and geatechanical characteristics. In addition; a supplemantary series of field tests was carried out to try and establish the in situ strength, continuity and stress condition of the underlying rock mass.
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(table available in full paper)
B. s
Goodnan jack survey - deformation-modulus - (Hustrulid, 1976)
Cross borehole geophysics
TV Borehole survey
Residual stress - USBM overoore technique
Point Load Index. - (Bieniawski, 1974),
Figure 2 - Geological Section S-l and location of NS core samples. Underground Oil Storage Facility wesleyville GS (available in full paper)
Within this section of the Trenton formation four zones have been identified and lithologically correlated according to their argillaceous content. These are as follow with their approximate thickness
Zone 1 - linestone - 15 feet
Zone 2 - shaly linestone - 60 feet
Zone 3 - linestone - 35 feet
Zone 4 - shaly linestone - +160 feet
This paper examines the results of the rock properties testing for each unit which were subsequently used to decide the location and aid in the design of the underground 01.1 storage facility.
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1. l
As seen in Figure 3, a thin section micro-photograph the typical petrography for the wesleyville linestone is an argillaceous, micro-fossiliferous linestone variety consisting of micro-fossils (>1 mm) and fragments in a fine, compact, dense, grey, micro-crystalline argillaceous and calcareous matrix.. Lower quantities of micro-fossils and higher percentages of fine argillaceous material were seen in Sate of the thin sections.
Figure 3. Photanicrographs of typical linestone thin sections.(available in full paper)
In Table 1, the mean values for the petrophysical properties of zones 2, 3 and 4 are shown. Fran these values, it was seen that Zone 3 slowed a consistently lower porosity while Zones 2 and 4 had a greater range of values. This latter effect seemed to be a direct result of the shaly interlayers in the Zone 2 and 4 limestones. Higher dynamic velocities in the zone 3 section generally indicated its above average rock quality in comparison to the lower velocities for Zones 2 and 4. Permeabilities measured on small core samples in the laboratory were on an average quite low agreeing with the borehole water pressure tests. However, the laboratory tests were suspect, for contrary to the normal, in sane cases, results for the horizontal orientation were higher than for the vertical.
TABLE 1 - SUMMARY OF MEAN PETROPHYSICAL PROPERTIES(available in full paper)
