Detail Interpretation of High Resolution Seismic Data. Timan-Pechora Province

Abstract

The results of the HRS-Geo technology application on the materials obtained in seismogeological conditions in the exploration areas of the Timan-Pechora Province (TPP) are presented. At the first of these sites, located in the southern part of the Mechayu-Pashnin swell and the Tebuk stage of the TPP, the geological structure of local uplifts was refined based on the results of 3D-data acoustic impedance (AI) and reflection coefficient (RC) cubes. The results of structural constructions reinterpretation are analyzed considering drilling data. Using the forms and values of the reference curves of seismic facies–clusters, oil-promising objects of structural, tectonically and lithologically screened types were identified in the deposits of the upper part of the Famennian stage. In the junction zone of the northeastern part of the Kolvin megaswell and the northwestern part of the Khoreyver depression, an assessment of the most important geological indicators of the real environment, the material composition and reservoir properties in the sediments of the Devonian and the Upper Silurian strata is made. Oil-perspective objects of a structural type in the target horizons were identified. In the central part of the Kolvin megaswell of the Pechora-Kolvin aulacogen and in the junction zone of the large Vozeya and Kharyagin swells, using 3D cubes and 2D sections AI and RC, the nature of the layering of sediments along productive and perspective horizons was studied. Detailed structural constructions for these horizons were made, sedimentation environments were considered by seismic facies classification in order to identify zones of facies substitution, zones of the geological heterogeneities in the process of studying the detailed internal structure and lithofacies variability of target deposits.