The Method of Correlation of the Pashisky Horizon Deposits in the Central Part of the Orenburg Region Based on the Combined Selection of Electrometric Facies and Lithotypes of; Rocks

摘要

The identification of regularities and determination of the causes of heterogeneities in the filtration and reservoir properties of the upper Devonian Pashisky horizon on the territory of the Orenburg region,which significantly improve the reliability of the geological model and geometry of the formation in order to optimize its further development,is possible with the use of the proposed integrated approach,even in conditions of low representation of logging and core selection.As a result,lithological and genetic types of rocks were identified for the study area-sandstones,mudstones,siltstones,limestones,and alternation of siltstones and mudstones.The analysis of the PS curve allowed us to divide the section of wells,including those not covered by core,into conditional identical units,which were compared with Muromtsev's electrofacies.It is established that the deposits of the Pashisky horizon were formed in the conditions of the sea coast with mixed wave activity.As a sealrock,we consider a pack of mudstones in the upper part of the horizon.As a result,the method has been developed that includes a number of sequential steps for detailed correlation of wells using complementary methods for characterizing well sections and determining sedimentation conditions.