By Gary Mavko
The Rock Physics guide with ease brings jointly the theoretical and empirical relatives that shape the principles of rock physics, with specific emphasis on seismic homes. additionally it is commonplace types and kinfolk for electric and dielectric rock homes. Seventy-six articles concisely summarize a variety of themes, together with wave propagation, AVO-AVOZ, powerful media, poroelasticity, pore fluid movement and diffusion. The e-book comprises overviews of dispersion mechanisms, fluid substitution, and Vp-Vs family. valuable empirical effects on reservoir rocks and sediments, granular media, tables of mineral facts, and an atlas of reservoir rock homes entire the textual content. This distillation of an differently scattered and eclectic mass of information is gifted in a kind that may be instantly utilized to resolve genuine difficulties. Geophysics pros, researchers and scholars in addition to petroleum engineers, good log analysts, and environmental geoscientists will worth The Rock Physics guide as a distinct source.
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Extra resources for The Rock Physics Handbook: Tools for Seismic Analysis of Porous Media
This is strictly true, regardless of pore geometry and pore concentration. The preceding equation can be slightly rewritten as where K g = up/% l d V is defined as the dry pore space stiffness. These equations state simply that the porous rock compressibility is equal to the intrinsic mineral compressibility plus an additional compressibility caused by the pore space. CAUTION: "Dry r o c k is not the same as gas-saturated rock. The dry frame modulus refers to the incremental bulk deformation resulting from an increment of applied confining pressure with pore pressure held constant.
A. **.... *..... *.. g:::. - 0 I I *.... I 1 60 80 Angle from stress axis (degrees) 40 20 I Stress (bars) 20 40 60 80 Angle from stress axis (degrees) 0 20 40 60 80 Angle from stress axis (degrees) I E L A S T I C I T Y I A N D H O O K E ' S L A W As uniaxial stress is applied, crack anisotropy is induced. The velocities (compressional and two polarizations of shear) clearly vary with direction relative to the stress-induced crack alignment. 1 below summarizes the elastic symmetries that result when various applied stress fields interact with various initial crack symmetries (Paterson and Weiss, 1961; Nur, 1971).
These are mathematically convenient shapes and allow quantitative estimates of, for example, K4, which was defined earlier in this section. Eshelby (1957) discovered that the strain, E i j , inside an ellipsoidal inclusion is homogeneous when a homogeneous strain, E:, (or stress) is applied at infinity. Because the inclusion strain is homogeneous, operations such as determining the inclusion stress or integrating to get the displacement field are simple. D E F O R M A T I O N O F I N C L U S I O N S It is very important to remember that the following results assume a single isolated cavity in an infinite medium.