Page 22 - Petroleum and Gas Field Processing
P. 22
Figure 3 Section in a salt-dome structure.
Figure 4 A reservoir formed by unconformity.
4. Unconformities: This type of reservoir structure, shown in
Figure 4, was formed as a result of an unconformity where the
impermeable cap rock was laid down across the cutoff surfaces
of the lower beds.
5. Lense-Type Reservoirs: In this type of reservoir, the petroleum-
bearing porous formation is sealed by the surrounding,
nonporous formation. Irregular deposition of sediments and
shale at the time the formation was laid down is the probable
Copyright 2003 by Marcel Dekker, Inc. All Rights Reserved.
