A mathematical model for the downhole orbital vibrator source

Conference · Sat Dec 31 00:00:00 EST 1994

OSTI ID:80175

Dong, W ^[1]

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1. Massachusetts Inst. of Technology, Cambridge, MA (United States). Earth Resources Lab.

An analytical expression for the downhole orbital vibrator source is proposed by approximating the source as rotating radial forces applied to the borehole wall. Decomposition of this expression indicates that the source is equivalent to the sum of four imaginary non-rotational sources. These imaginary sources, in conjunction with Green`s functions, provide a direct way of generating synthetic seismograms. They are used in this paper to obtain the displacement in homogeneous isotropic and transversely isotropic (TI) media. Evaluation of the displacement suggests that the source would be useful in detecting shear wave anisotropy by crosshole experiments.

• OSTI ID: 80175
• Report Number(s): CONF-941015-; TRN: IM9532%%302
• Resource Relation: Conference: 64. annual meeting of the Society of Exploration Geophysicists and international exposition, Los Angeles, CA (United States), 23-27 Oct 1994; Other Information: PBD: 1994; Related Information: Is Part Of SEG international exposition and sixty-fourth annual meeting -- 1994 Technical program: Expanded abstracts with authors` biographies; PB: 1736 p.
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
58 GEOSCIENCES
SEISMIC SOURCES
ACOUSTIC MEASUREMENTS
DATA ANALYSIS
BOREHOLES
SONIC LOGGING
MATHEMATICAL MODELS
SEISMIC WAVES
RESPONSE FUNCTIONS
ALGORITHMS
DATA PROCESSING
PETROLEUM INDUSTRY