Natural reservoir facial-petroleum field analysis for oil and gas field development

Abstract

The article describes the method of facies analysis, the relevance of which is determined by the difficulties in the study of genetic spatial heterogeneity of productive natural reservoirs by traditional, mainly "remote" methods, such as geophysical well surveys (GIS) and seismic surveys. In these conditions the facies analysis is of paramount importance: both in traditional for sedimentary strata and in its refined or new modifications. Most often, the sedimentological study uses the developments known as the facies-cyclic analysis, which predetermines a clear methodology of research, providing for a sequential separation of facies - establishment of cycles - correlation of sections - paleogeographic reconstruction, with obligatory "reverse" verification of constructions at each successive stage. However, in today's reality, the classical study of oil and gas exploration and production is practically impossible because of incomplete core sampling, fragmentation of its removal, a priori insufficient amount of core material, especially for unproductive horizons. With the mentioned non-compliance of facies-cyclic "canons" it is suggested to realize direct and direct use of facies studies, realized on the borehole cores for sedimentological and petrophysical modeling of geological natural systems. Thus, consciously removing the problems associated with the allocation of cycles, diachrony of layers of migratory nature, thus having a direct transition to the solution of practical oil and gas problems, based on a reliable facies basis. The method is developed for deep productive horizons, inaccessible to direct observation, in conditions of limited actual data (small number of cores).