By Ronald Nelson
Geologists, engineers, and petrophysicists thinking about hydrocarbon construction from evidently fractured reservoirs will locate this publication a important instrument for acquiring pertinent rock information to judge reserves and optimize good position and function. Nelson emphasizes geological, petrophysical, and rock mechanics to counterpoint different reviews of the topic that use good logging and classical engineering approaches.
This good equipped, up-to-date version features a wealth of box and laboratory facts, case histories, and sensible suggestion.
A nice how-to-guide for somebody operating with fractured or hugely anisotropic reservoirs
Provides real-life illustrations via case histories and box and laboratory facts
Read or Download Geologic Analysis of Naturally Fractured Reservoirs, Second Edition PDF
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Extra info for Geologic Analysis of Naturally Fractured Reservoirs, Second Edition
In general, sliding friction (not to be confused with internal friction) along a fracture plane is relatively low if we consider brittle rock in contact with brittle rock across the fracture plane, and relatively high if we consider two ductile rocks in contact across the fracture plane (Logan and others, 1972). The lowest relative sliding friction is developed with unlike rocks in contact across the sliding surface. A great deal of work has been done on gouge development in both field and laboratory observations (Stearns, 1968a; Brock, 1973; Engelder, 1973; Aydin, 1977; Pittman, 1981; and Jamison and Stearns, 1982).
This author has observed that the majority of tectonic fractures in outcrop tend to be shear fractures. However, locally I have seen examples of folds in compressive environments where the deformation is dominated by extension fractures. Tectonic fractures form in networks with specific spatial relationships to folds and faults. Fault-Related Fracture Systems Fault planes are, by definition, planes of shear motion. The majority of fractures developed in the vicinity of faults are shear fractures parallel to the fault, shear fractures conjugate to the fault, or extension fractures bisecting the acute angle between these two shear directions (the zone of fault slip or gouge is complex, and has its own internal deformation morphology).
It is postulated that these fractures owe their orientation to the compression or shortening directions of the belt at the basin edge and on the belt’s geometric variation. Variations in the shape of the indenter or compressing block are envisioned to give variations in the strike of the resulting regional fractures within the basin. A convincing argument can be made for this idea. However, several features of regional fractures worldwide do not fit this model: 1. The intensity of regional fracture systems do not vary dramatically from the active basin margin to the basin center; they should decrease noticeably in intensity toward the basin center.