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Interwell matching using a combination of petrophysically derived numerical lithologies and gene-typing techniques

Abstract The use of gene-typing techniques in stratigraphic matching problems has been steadily developing since Smith & Waterman published an example in 1980. The regular use of these techniques to assist in stratigraphic correlations using wireline log data has, however, been hindered by the lack of suitable precisely defined lithological units. In an oil-field production or exploration environment, the porosity logs and a natural gamma log can be used to derive various types of numerical lithologies. These lithologies provide a convenient starting point for the use of gene-typing algorithms since they comprise a relatively small set of precisely defined reproducible units. The advantage of using a gene-typing technique is that it enables multiple matching hypotheses to be produced from sequences which contain gaps, stretched zones, and duplicated sections. These matches can assist the production of stratigraphic correlations. Examples of matching are presented from reservoir sections in the Statfjord and Murchison fields.