Features of Geometrization of Deposits in Deltaic Sandstones of Cretaceous Sediments in the North of the West Siberian Oil and Gas Province

Abstract

Based on the complex geological and geophysical information and results of laboratory core studies, the detailed structure of sand sediments of the underwater part of the delta system has been studied. This has allowed to explain the distribution of hydrocarbons in the deposits due to morphological features of sedimentological objects.The work used the results of spectral decomposition of seismic data, interpretation of which allows to reconstruct with high detail morphology and structure of studied sediments. Sedimentological analysis of core was performed. The conclusions were compared with actual data of geological and geophysical well studies. The work identified two classes of sandstones with different filtration characteristics, which, taking into account seismic facies analysis, formed the basis for a conceptual geological model of the progradation of the sea delta coast with a predominance of wave processes.The presented conceptual model explains the distribution of sand material, its filtration characteristics, takes into account the physical processes of formation of the sediment profiles and allows to more accurately predict the distribution of the productive part of the formation, which helps to increase the success of drilling horizontal wells.The presented conceptual model explains the distribution of sandy material, its filtration characteristics, takes into account the physical processes of formation of the sediment profile of the sea coast and makes it possible to more accurately predict the distribution of the productive part of the formation, which helps to increase the success of drilling horizontal wells.

Keywords

• geological model
• deltaic sandstones
• cretaceous deposits
• north of the west siberian oil and gas province