Transmission-reflection tomography: Application to reverse VSP data
- Univ. of Leeds (United Kingdom). Dept. of Earth Sciences
A multiphase tomographic algorithm is presented that allows 2-D and 3-D slowness (inverse of velocity) and variable reflector depth to be reconstructed simultaneously from both transmission and reflection traveltimes. The authors analyze the ambiguity in the determination of velocity and depth in transmission and reflection data and realize that depth in transmission and reflection data and realize that depth perturbation is more sensitive to reflection traveltime anomalies than slowness perturbation, whereas the reverse is true of transmission traveltime anomalies. Because of the constraints on velocity and depth provided by the different wave types, this algorithm reduces the ambiguity substantially between velocity and depth prevalent in reflection tomography and also avoids the undetermined problem in transmission tomography. The linearized inversion was undertaken iteratively by decoupling velocity parameters from reflector depths. A rapid 2-D and 3-D ray-tracing algorithm is used to compute transmission and reflection traveltimes and partial derivatives with respect to slowness and reflector depth. Both depth and velocity are parameterized in terms of cubic B-spline functions. The method has been applied to a reverse vertical seismic profile (VSP) data set recorded on the British coal measures along a crossed-linear array.
- OSTI ID:
- 514751
- Journal Information:
- Geophysics, Journal Name: Geophysics Journal Issue: 3 Vol. 62; ISSN GPYSA7; ISSN 0016-8033
- Country of Publication:
- United States
- Language:
- English
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