oa Geostatistics - A Tool to Map Thin Reservoirs

The Munderfing gasfield in the Upper Austrian molasse basin consists of Lower Miocene turbidite sands reworked in a deep ocean bottom channel system. Net thicknesses of sands vary from 0 to 8 m in as many as 10 individual layers over an interval of 150m. Historically, the minimal thickness of these bodies and complex stratigraphy have prevented mapping of the packages. Recent experience with a multidisciplinary approach involving geostatistics and seismic attribute analysis (along with geologic and engineering data) offers the potential of changing this situation. This paper will discuss the data preparation, the geostatistical analysis and the final map evaluation procedures that RAG is currently using in this environment.