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Now showing items 1-10 of 135

#### Borehole Stoneley Wave Propagation Across Permeable Structures: Comparison Between Theory And Experiment

(Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)

The attenuation of borehole Stoneley waves across a permeable structure (e.g., fractures
or fracture zone) is correlated with the permeability of the structure. Using a
simplified Biot theory, the structure can be modelled ...

#### A Short Note On Permeability Anisotropy In Heterogeneous Porous Media

(Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)

This paper presents some new results of theoretical modeling on permeability anisotropy
in heterogeneous porous media. It is shown that the lineation of heterogeneities results
·in permeability anisotropy. However, to ...

#### Radiation Patterns Of Compressional And Shear Transducers At The Surface Of An Elastic Half Space

(Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)

The radiation patterns of an elastic wave field generated by circular plane compressional
and shear transducers are derived using the method of steepest descent. These patterns
contain both effects of the elastic half ...

#### Numerical Simulation Of The Acoustic And Elastic Wavefields Radiated By A Source In A Fluid-Filled Borehole Embedded In A Layered Medium

(Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)

We present a method of calculation to simulate the propagation of acoustic and elastic
waves generated by a borehole source embedded in a layered medium. The method is
formulated as a boundary element technique where the ...

#### Laboratory Study Of Frequency Dependent Streaming Potentials

(Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)

Frequency dependent streaming potentials were measured on a glass capillary, porous
filter, and a sample of Boise sandstone. The pore diameters for these three samples
range from 1 millimeter to 34 micrometers. The ...

#### Borehole Wave Propagation In Isotropic And Anisotropic Media III: Anisotropic Formation

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

In this paper we extend the 3-D finite difference method to simulate wave propagations in
an anisotropic medium. The scheme is tested in the homogeneous medium. The finite
difference results agree excellently with the ...

#### Stoneley Wave Propagation Across Borehole Permeability Heterogeneities

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

An important application of borehole acoustic logging is the determination of formation
permeability using Stoneley waves. Heterogeneous permeable structures, such as fractures,
sand-shale sequences, etc., are commonly ...

#### Electrokinetics Of A Fluid-Saturated Rock Sample: Laboratory Experiments

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

The conversion between seismic and electromagnetic energies was discovered in a fluidfilled porous formation. When seismic waves propagate through a fluid-saturated porous formation, relative motion between the pore fluid ...

#### Acoustic Waveform Logging - Advances In Theory And Application

(Massachusetts Institute of Technology. Earth Resources Laboratory, 1992-02)

Full-waveform acoustic logging has made significant advances in both theory and application in recent years, and these advances have greatly increased the capability of log analysts to measure the physical properties of ...

#### Transient Fluid Flow In Heterogeneous Porous Media

(Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)

A stable Alternating Direction Implicit finite-difference algorithm is used to model transient fluid flow in heterogeneous porous media. In connection with the laboratory system for pressure transient testing of core ...