Simultaneous Determination of Source Wavelet and Velocity Profile Using Impulsive Point-Source Reflections from a Layered Fluid
RICE UNIV HOUSTON TX DEPT OF MATHEMATICAL SCIENCES
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The determination of source signature is a major calibration problem in reflection seismology. This deconvolution problem is conventionally approached by way of statistical methods, by direct measurement, or by the location of a clean reflection in an otherwise quiet part of a reflection section. We show that a quasi-impulsive, isotropic point source may be recovered simultaneously with the velocity profile from reflection data over a layered fluid, in linear perturbation approximation. Our approach is completely deterministic, and does not depend on the presence of an isolated reflection in a quiet part of the section, as we illustrate with a numerical example. After describing the algorithm and a numerical implementation, we give a complete mathematical treatment, which shows that our estimates of source wavelet and velocity profile are stable in a certain sense. Because of this stability property we conjecture that our approach to simultaneous estimation of source and medium parameters actually applies to a much broader class of models than that treated here.