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Method for deriving reservoir lithology and fluid content from pre-stack inversion of seismic data

  • US 5,583,825 A
  • Filed: 09/02/1994
  • Issued: 12/10/1996
  • Est. Priority Date: 09/02/1994
  • Status: Expired due to Fees
First Claim
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1. A method for deriving the lithology and fluid content at a subsurface target location from pre-stack seismic reflection data obtained at both said subsurface target location and a subsurface calibration location having known lithology and fluid content, said method comprising the steps of:

  • (a) creating computer models of said subsurface target and calibration locations;

    (b) selecting a set of elastic parameters representative of said known lithology and fluid content at said subsurface calibration location;

    (c) performing an inversion of said pre-stack seismic reflection data to determine the values of said set of elastic parameters at each of a plurality of points in said models of said subsurface target and calibration locations;

    (d) comparing relative magnitudes of said elastic parameter values for said subsurface target and calibration locations; and

    (e) using the results of said comparison and said known lithology and fluid content at said subsurface calibration location to derive said lithology and fluid content at said subsurface target location.

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