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Collaborating Authors
1992 SEG Annual Meeting
REVIEW OF WHITES BOREHOLE COUPLING THEORY In 1953, J. E. White developed the theory of borehole Consider a uniform.
A study of the wave field from a cylindrical bender The configuration and the coordinates are shown in Fig. source in an infmite fluid was undertaken to understand the 1. Under the assumption that the motion of the surface of bender is cylindrically symmetric and can be characterized source behavionr for both near and far field. This study is a continuation of our previous work (Zou, et al., 1990).
The computed line source mechanism is now used in a pre existing modeling code, overiding the normal choices of: We have developed a numerical technique for modeling subkilohertz buried point force or a buried monopole. The modeling cod1 seismic data acquired with a borehole hydrophone, a must compute as output the wavefield at all points along the borehole volume source, or both, in the case of cross well data.
- Europe (0.69)
- North America > United States > Texas > Dawson County (0.40)
Mach wave displacement is estimated by considering the tube The far-field radiation patterns for crosshole sources can wave to be a moving point source and applying ray tracing to be approximated using the stationary phase method.
- Geophysics > Seismic Surveying > Seismic Processing (1.00)
- Geophysics > Borehole Geophysics (1.00)
Each location has three source orientations: one vertical (P), two Multi-component multi-offset VSPs in South Casper Creek, horizontal sources (SR and ST), and each source was Wyoming are analyzed and modelled to examine the recorded into three-component geophones (1, radial; y, mechanism of anisotropy and to understand the characteristic transverse; Z, vertical), forming 9-component data.
- North America > United States > Wyoming > South Casper Creek Field > Tensleep Formation (0.99)
- Europe > France > Paris Basin (0.99)
The median filtering method or subtraction Tube waves are guided waves which travel in a method, as it is sometimes called, is one of the most borehole after a seismic disturbance. Tube wave commonly used time-domain techniques for noise appears as strong amplitude linear events suppressing tube waves. The method for using the which can override desired signal. Median filters median filter in this manner is described by tend to reject spikes and pass uniform data.
- Geophysics > Seismic Surveying (1.00)
- Geophysics > Borehole Geophysics (1.00)
Detailed structural analysis can be achieved using a least squares The use of a set of theoritical arrival-times (Mk) and method applied on reflected events observed on a constant offset acoustic sections. We demonstrate that the a least square projection method lead to an optimal extraction of the waves.
- Geophysics > Seismic Surveying (1.00)
- Geophysics > Borehole Geophysics (1.00)
Vertical seismic profiles (VSPs) provide v&able information about the variation of seismic velocities with depth in the borehole. In a zero offset VSP (source located at the well head), if the well is ver-The parametric inversion technique (Esmersoy, 1988,199O; Leaney tical, most of the downgoing energy near the first break propagates and Esmersoy, 1989; Leaney, 1990) was employed in this study, vertically along the receiver array, hence the medium velocity can providing a satisfactory separation of the input wavefield into four be determined easily from the interval travel times. In a horizon-dominant wavefields (up and downgoing P and up and downgoing tally layered medium, the velocities can be obtained from the travel SV). The resultant P-waves were then processed further in the stan-times by inverting the time-depth relationship (Grant and West, dard VSP processing chain and provided very encouraging results.
Benjamin 5-4-29-7W5 was The thin skinned thrusting at Benjamin Creek drilled midway between two seismic lines 2200 m apart. The culminates in a duplex (Figure 1), ie. a stacked succession of well tested gas from repeats of Turner Valley reservoir thrust sheet sharing common floor and roof thrusts. Repeats involved in a duplex, or imbricate stack, of Mississippian within the duplex provide the potential to overthicken the strata. A zero and 4 offset VSP survey was acquired around productive reservoir of the Mississippian section.
- North America > United States > Alaska > Arctic Ocean > Arctic Basin > Amerasia Basin > Canadian Basin (0.99)
- North America > Canada > Alberta > Western Canada Sedimentary Basin > Alberta Basin > Deep Basin > Turner Valley Formation (0.91)
- North America > Canada > Alberta > Western Canada Sedimentary Basin > Alberta Basin > Deep Basin > Jumping Pound Field (0.91)
- North America > Canada > Alberta > Western Canada Sedimentary Basin > Alberta Basin > Deep Basin > Burnt Timber Field (0.91)
A 374m deep we 41 was drilled with 219mm 3-corn bits. A downhole triaxial An idea of using a drill-bit as a downhole seismic detector with a 3C piezoelectric accelerometer was set source has recently attracted attention (Kostov, 1989; at 200m in a separate measurement well.