Western Atlas International, Inc.

Yu Taik Chon

Tawassul Ali Khan

Walter R Turpening

A method of determining the continuity of earth formations between wellbores by analyzing seismic energy imparted to the formations. The energy is imparted to the formations at a plurality of depths in one wellbore and is received at a plurality of depths in another wellbore. Compressional and shear components of the seismic energy received in the other wellbore are separated. A frequency spectrum is determined for the compressional component and the shear component of the seismic energy at each selected depth. Common imparted depth stacks of the compressional components and shear components are assembled at the depths at which the seismic energy is imparted. Common received depth stacks of the compressional components and the shear components are assembled at the selected depths at which the energy is received. The assembled common imparted depth stacks of the compressional components and the shear components are plotted and the assembled common received depth stacks of the compressional components and shear components are plotted. Formations having related frequency spectra of the compressional components and formations having related frequency spectra of the shear components may be detected.

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Yu Taik Chon