Page 134 - Principles of Applied Reservoir Simulation 2E

Part II: Reservoir Simulation 119

of disciplines will play an increasingly important role in the future of reservoir
modeling. Many modelers have predicted that the integration of disciplines will
manifest itself in reservoir modeling as finer 3-D models with more seismic and
geological detail [He, et al,, 1996; Kazemi, 1996; Uland, et al., 1997]. This
prediction is being borne out with growing interest in shared earth models
[Tippee, 1998], model-centric working environments [Tobias, 1998; Fanchi, et
al, 1999], and reservoir simulation models with a million or more gridblocks
[Dogra, 2000].

Exercises

Exercise 12.1 Seismic Parameters: Data set EXAM 11.DAT is a cross-section
model of a two-layer gas reservoir undergoing depletion with aquifer influx into
the lower layer. (A) Run EXAM 11 .DAT and find the initial water saturation (5 W),
compressional velocity (Y p), reflection coefficient (RC), and ratio of
compressional velocity to shear velocity (V p/V s) in block 1=1 of layer k = 2.
(B) Verify the maps IVPMAP, IRCMAP and IVRMAP are activated using the
information given in Chapter 25.1. Record S w, V P, RC, and V pIV s in block I =
1 of layer K = 2 at the end of the run. Notice how the attributes change as water
moves into the layer.

Exercise 12.2 Repeat Exercise 12.1 using a critical gas saturation of 0. This
should be achieved by setting the relative permeability of gas to 0.01 at a gas
saturation of 0.03.

Exercise 12.3 Repeat Exercise 12.1 using a grain bulk modulus K G that is equal
to the frame bulk modulus K B. Use Eq (27.13) to explain your results.