Spectral Component Geologic Modeling: A New Technology for Integrating Seismic Information at the Correct Scale

Abstract

Spectral component geologic modelling (SCGM) is a new technology developed to properly account for both the scale and accuracy of any and all interpretations derived from seismic data in building geologic models. Seismic data can be integrated as spectral components which are volume- or map-based property interpretations representing a specific and measurable scale. The SCGM method starts with combining different spectral components together to build what is referred to as a "tentative geologic model", accounting for different scales and measurement accuracy of information in each component. The tentative geologic model will then be further constrained to honor the spatial continuity by substituting the amplitude spectrum of current tentative model with the desired amplitude spectrum from the target variogram model through spectral simulation. After that, the model will then be post processed to first honor the target histogram and then well data. In addition to honoring one single global variogram model, as do traditional geostatistical algorithms, SCGM has the capability to model local variations or trends in the continuity range and dominant azimuth direction of spatial continuity, by modifying the amplitude spectrum using spectral simulation.