Three component vertical seismic profiles: Polarization measurements of P‐wave particle motion for velocity analysis

Gaiser, James; Ward, Ruby; DiSiena, James

doi:10.1190/1.1826869

Cited by 6 publications

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“…Velocity anisotropy studies utilizing three-dimensional VSP data generally consider compressional and shear wave velocity as a function of the azimuth of ray propagation [Gal'perin, 1971;Crampin, 1983;DiSiena et al, 1984;Gaiser et al, 1984]. Wave mode polarization analyses of VSP data have been restricted primarily to body waves to determine seismometer orientation .…”

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“…Wave mode polarization analyses of VSP data have been restricted primarily to body waves to determine seismometer orientation . Gaiser et al [1984] compared compressional wave polarizations to ray theoretical models to measure velocity anisotropy. Stephen [1981Stephen [ , 1984 analyzed VSP data recorded in the ocean crust and found evidence of anisotropy from horizontally polarized shear waves.…”

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confidence: 99%

“…In order to reference the guided wave polarization angle to north the azimuth of the seismometer sonde must be deter-mined. This can be accomplished with the assumption of linear polarization of the compressional arrival in the direction of propagation [White, 1964;Hardage, 1983;Gaiser et al, 1984]. To determine the tool orientation, the compressional arrival is windowed on the horizontal X and Y traces (Figure la).…”

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Determination of in situ stress orientation from borehole guided waves

Barton¹,

Zoback²

1988

J. Geophys. Res.

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We have analyzed the horizontal particle motion of borehole guided waves from three‐component vertical seismic profile data recorded from three experiments. The polarization directions of the guided waves are consistent with the direction of horizontal principal stress determined independently. We suggest that stress‐induced velocity anisotropy in the rock adjacent to the borehole appears to cause antisymmetric flexural guided modes to be polarized in the direction of the maximum horizontal principal stress. Thus analysis of the horizontal particle motion of borehole guided waves appears to represent a new method for determining the orientation of horizontal principal stresses.

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Determination of in situ stress orientation from borehole guided waves

Barton¹,

Zoback²

1988

J. Geophys. Res.

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“…If there are interferences from refracted waves, smaller windows may be used. In three‐component VSPs, window lengths as small as 5–10 ms were used for similar polarization analysis ( Gaiser, Ward and DiSiena 1984). However, such tiny windows are not recommended for sea‐floor data, as the results can be unstable.…”

Section: Field Data Analysismentioning

confidence: 99%

Geophone orientation and coupling in three‐component sea‐floor data: a case study

Yuan

1999

Geophysical Prospecting

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We analyse the geophone orientation and coupling in a data set from the North Sea. Based on the polarization of the water‐break on the sea‐floor, we have derived processing algorithms for determining the receiver orientation for gimballed and non‐gimballed geophone systems. For a gimballed system, the problem reduces to a simple horizontal rotation. However, for a non‐gimballed system, where all three geophone axes may vary due to varying acquisition conditions such as dipping sea‐floor, twisting of recording cable, etc., the three orientation angles cannot be found directly from the recorded displacement vectors. Using the data redundancy within a common‐receiver gather, a robust two‐stage method is derived for the non‐gimballed system in which all three orientations can initially be unknown. Testing on the North Sea data set acquired with a gimballed system shows that the three‐component geophones in the data set are orientated satisfactorily within an error of 5°. However, there are some undesirable cross‐couplings between the vertical and horizontal geophones, which results in leakage of shear‐wave energy from the horizontal components to the vertical components.

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“…Gaiser et al (1982) were the first to estimate ⃑⃑⃑ through ray-tracing, but did not use this information to refine their VSP reorientation. Gaiser et al (1982) were the first to estimate ⃑⃑⃑ through ray-tracing, but did not use this information to refine their VSP reorientation.…”

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confidence: 99%

Vertical Seismic Profile Complete Session

2016

SEG Technical Program Expanded Abstracts 2016

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Three component vertical seismic profiles: Polarization measurements of P‐wave particle motion for velocity analysis

Cited by 6 publications

References 0 publications

Determination of in situ stress orientation from borehole guided waves

Determination of in situ stress orientation from borehole guided waves

Geophone orientation and coupling in three‐component sea‐floor data: a case study

Vertical Seismic Profile Complete Session

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