GeoTime~(TM): A Novel, Automatic 3D Chronostratigraphic Seismic Interpretation Methodology for Complex Geological Settings

摘要

Chronostratigraphic seismic interpretation provides insights into basinal evolution. By mapping the internal stratigraphic architecture, this method has been widely used for well placement optimization and reservoir model building. Over many years of research at TOTAL, the Sismage team has created GeoTime?, a software tool for automatic chronostratigraphic analysis of seismic data, particularly in complex geological settings. This tool can be used to automatically or semi-automatically track the chronostratigraphic surfaces. The output is a 3D cube of stratigraphic surfaces (iso-geological time) which can be used to build the frame work for geomodels. A 3D cube of “Wheeler Diagram” is also obtained by segmenting the seismic volume into different depositional or non-depositional packages. This diagram provides better understanding on the spatial distribution of deposition through the geological time. In this paper, we will firstly introduce the GeoTime? methodology, and then demonstrate two application examples. The first example is taken at a regional scale, where GeoTime? was used to automatically track the major stratigraphic surfaces within a first order progradation system. The seismic volume was then segmented into sub order sequences bounded by the automatically tracked surfaces. 3D Wheeler diagram was also constructed to understand the depositional history. The second example is taken at reservoir scale from a producing field with more than 800 borehole penetration. In this example, we imposed geological constraint into the GeoTime? workflow, and improved the previous interpretation of higher order prograding clinoforms for placing new development wells.