Blind Tests of Inversion Package for Stratigraphic Interpretation

Abstract

This paper presents the blind test experiment set up for the EAEG workshop on Practical Aspects of Seismic Inversion(Berlin, 1989). The target was to review the possibilities provided by seismic data inversion at the end of the 1980's. This blind test consisted in deriving an acoustic impedance cross-section from a poststack seismic section and an impedance log. The control of the solution was made by comparison of the solution with logs at different well locations, these logs being kept hidden before the workshop. We give a mathematical formulation of the considered seismic inverse problem and we describe in detail the blind test experiment. We present the results obtained during this blind test with two software packages: SPIDER (Elf Aquitaine) and INTEGRATE (Jason Geosystems). These results and other results presented during the workshop (see the papers in this issue) illustrate the effectiveness of seismic inversion and the importance of integrating geological information during the inversion process.