Page 126 - Principles of Applied Reservoir Simulation 2E

Part II: Reservoir Simulation 111

in the context of an emerging discipline known as reservoir geophysics. For
example, see de Buyl, et al. [1988], Evans [1996], Blackwelder, et al. f 1996],
Beasley [1996], and Jack [1998].

Control Point

Figure 12-5a. Smooth contour lines.

Figure 12-5b. Undulating contour lines.

12.2 Mega Scale
The Giga Scale helps define reservoir architecture, but is too coarse to
provide the detail needed to design a reservoir development plan. The Mega
Scale is the scale at which we begin to integrate well log and well test data into
a working model of the reservoir. Table 12-2 illustrates the type of information
that can be obtained at the Mega Scale level from well log data. The most
common interpretations of each log response are included in the table. For
example, a high gamma ray response implies the presence of shales, while a low
gamma ray response implies the presence of clean sands or carbonates. A
combination of well logging tools is usually needed to minimize ambiguity in
log interpretation, as discussed by Brock [1986].