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The starting point for this method is the construction of the The required CPU time on the VAX 1 l/730 is 5 hours and 2 Green's function for the ideal borehole. This may be done by a minutes for the results of Figure 4 (a and b together) and is 5 normal mode expansion (separation of variables in cylindrical coordinates), hours and 8 minutes for that of Figure 5.
The starting point for this method is the construction of the The required CPU time on the VAX 1 l/730 is 5 hours and 2 Green's function for the ideal borehole. This may be done by a minutes for the results of Figure 4 (a and b together) and is 5 normal mode expansion (separation of variables in cylindrical coordinates), hours and 8 minutes for that of Figure 5.
- Geophysics > Borehole Geophysics (1.00)
- Geophysics > Seismic Surveying (0.68)
Because this method neglects refraction, dip estimates are smaller than the true dips.
Because this method neglects refraction, dip estimates are smaller than the true dips.
There are several geophysical techniques with potential use for detection and mapping of remote fracture zones in crystalline -400 - rock bodies. The seismic cross-hole method recently received close attention in this connection. This method attempts to map -5OO* the variation of velocity and attenuation of seismic waves between two holes. These parameters can then be related to the occurrence of cracks or fracture zones. In practice this method systematically scans the area between the holes by seismic signals, Figure 1.
- Geophysics > Seismic Surveying > Seismic Processing (1.00)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling (0.31)
There is a-good correlation between these two A typical Silurian reef structure of Michigan is shown in Figure velocity curves.
- Europe (0.29)
- North America > United States > Michigan (0.26)
Computer models have been in the radial direction, we expand the differential equation and important in the design and interpretation of all these electrical describe the tions.
The application of this method to real data is inverse problem: Presented at the 45th EAEG Meeting, Oslo. So this method can be an accurate tool for the reconstruction of the reflectivity (and impedance) profile in the well zone and below the bottom of the well and for the interpretation of VSP data (calibration of seismic surface data, multiple identification, improvement of signal/noise ratio, etc.). The results show that a lowfrequency 1979, About the stability of the inverse problem in a I-D wave equation. A.. Chavent, G.. Hemon, C., and Lailly, P., 1982, Inversion is a significant fluid layer behind the casing. Chavent, G., 1974, Identification of functional parameters in partial differential with a fluid layer behind the casing, the casing conducts a highamplitude equations.
- Research Report > New Finding (0.51)
- Research Report > Experimental Study (0.37)
Computer models have been in the radial direction, we expand the differential equation and important in the design and interpretation of all these electrical describe the tions.
Systematic examination reveals waves in the ground, VSP is an extremely effective method. The complicated arrival structure in exact full wave VSPs from even authors conducted P-wave and M-wave zero offset VSP in boreholes the simplest ocean crustal model. Present DSDP experiments are 300-350 m deep, drilled in a region of mudstone. In addition, utilizing multioffset VSPs to better resolve lateral velocity variations suspension PS logging was carried out in the same boreholes.