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Cross-hole tomography for strongly variable media with applications to scale model data

CENTER FOR LITHOSPHERIC STUDIES THE UNIVERSITY OF TEXAS AT DALLAS, P.O. BOX 688, RICHARDSON, TEXAS 75083
STANDARD OIL PRODUCTION COMPANY ONE LINCOLN CENTER, SUITE 1200, 5400 LBJ FREEWAY, DALLAS, TEXAS 75240

Abstract

A cross-hole ray tomography system is designed for imaging strongly varying velocity distributions; key features are ray bending and the incorporation of multiple raytraces to update the ray paths as the velocity estimates converge. In this context, convergence means that time residuals are stationary both between tomography iterations and between raytraces.

For strongly variable velocities, simultaneous iterative reconstruction is recommended rather than classical algebraic reconstruction (convergence is slower but stability is improved). Picking of arrival times must be very sophisticated and involve many arrivals if structural details are to be resolved. Examples include both synthetic and scale model data.

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