Page 202 - Geology of Carbonate Reservoirs
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FRACTURES AND FRACTURED RESERVOIRS 183
Formation
Slabbed Micro-Imager
3″ Fullbore 3-D 7 7/8″
Core Core View
Woodford Shale
Hunton Unconformity
Stylolite
Good, Medium to Small
Vug Development
High Angle, Vug
Enhanced Fractures
Vugs Associated
With Fracturing
Vugs Associated
With Fractures
Brecciated
High Angle, Vug
Enhanced Fractures
Stylolite
®
Figure 7.6 Imaging logs such as this FMI log by Schlumberger are invaluable aids to
determine fracture location, orientation, and spacing. Note the photo of the borehole core to
the left of the image log. Some of the fractures and vugs are visible on the core photo and
even more clearly on the image log. Most of the fractures are in conjugate sets that are
highlighted by lines drawn on the image. Imaging may be based on differences in electrical
resistivity, as the FMI log, or on acoustic responses. Extensive discussion on imaging logs can
be found in Rider (1996) and Asquith and Krygowski (2004) . (Illustration from Garber
(2001) , courtesy of the author.)
