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Now showing items 31-40 of 101

#### Shear Wave Logging In Semi-Infinite Saturated Porous Formations

(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)

Recent theoretical and experimental studies have demonstrated the interest of using
non-axisymmetric sources, such as dipole and quadrupole, to record shear wave events
in any kind of formation (fast or slow). Non-axisymmetric ...

#### Acoustic Wave Propagation In A Fluid-Filled Borehole With A Horizontal Fracture

(Massachusetts Institute of Technology. Earth Resources Laboratory, 1990)

The propagation of guided waves in a fluid-filled borehole with an open horizontal
fracture is investigated both theoretically and experimentally. The fracture is modeled
as a fluid layer that separates the domain of ...

#### Borehole Stoneley Wave Propagation Across Heterogeneous And Permeable Structures

(Massachusetts Institute of Technology. Earth Resources Laboratory, 1991)

This study investigates the propagation of borehole Stoneley waves across heterogeneous
and permeable structures. By modeling the structure as a zone intersecting the borehole,
a simple one-dimensional theory is formulated ...

#### Acoustic Wave Propagation In And Around A Fluid-Filled Borehole Of Irregular Cross-Section

(Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)

Boreholes with 10% or more ellipticity are not uncommon. In this paper, we consider
the coupling of an incident elastic wave into a borehole of irregular cross-section and
investigate the cross-mode coupling phenomenon ...

#### Untitled

(Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)

This paper describes a propagator matrix formulation for the problem of the Stoneley
wave propagation in an irregular borehole. This is based on a simple one-dimensional
theory that is possible for the low frequency ...

#### Fast Inversion Of Formation Permeability From Stoneley Wave Logs Using A Simplified Blot-Rosenbaum Model

(Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)

This paper describes a fast algorithm for estimating formation permeability from Stoneley
wave logs. The procedure uses a simplified Biot-Rosenbaum model formulation. The
input to the inversion is the Stoneley wave ...

#### Effects Of A Borehole Environment And Residual Hydrocarbon On Stoneley Wave Amplitude And Reflectivity

(Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)

In recent years, borehole Stoneley wave amplitude and reflectivity have been used for
estimating formation permeability based on the strong correlation between Stoneley
wave attenuation, reflectivity and formation fluid ...

#### Application Of Rayleigh's Principle To Guided Waves In A Borehole

(Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)

The Lagrangian for guided waves in a completely general borehole model is presented.
Rayleigh's principle is used to derive the first order perturbations in wavenumber and
frequency due to slight perturbations in the ...

#### Dynamic Permeability And Borehole Stoneley Waves: A Simplified Biot-Rosenbaum Model

(Massachusetts Institute of Technology. Earth Resources Laboratory, 1990)

Stoneley waves in permeable boreholes are diagnostic of formation permeability because
their propagation is affected by the dynamic fluid flow at the borehole wall. We
characterize this flow using the concept of dynamic ...

#### Lithologic Cycles And Paleo Fluid Flow Channels In Old Oceanic Crust From Geophysical Logs At ODP Site 418A

(Massachusetts Institute of Technology. Earth Resources Laboratory, 1990)

Using some new processing of the multichannel sonic (MCS) log data from Site 418A,
the resulting P, S, and Stoneley wave velocity estimates and apparent attenuation were
integrated with the natural gamma, spectral gamma, ...