Methodological approaches used in identifying anomaly-forming geological objects in various areas of Bashkortostan

UDK: 553.984+550.834

DOI: 10.24887/0028-2448-2026-6-23-27

Key words: geological study of subsurface, zone of the upper part of the section (ZUPS), seismic surveys, restoration of elastic characteristics of well sections

Authors: G.V. Mugalimova (Branch of RN- GRD in Ufa – BashNIPIneft, RF, Ufa); A.S. Belyalova (Branch of RN- GRD in Ufa – BashNIPIneft, RF, Ufa); O.V. Terekhov (Branch of RN- GRD in Ufa – BashNIPIneft, RF, Ufa); R.D. Bakirov (Branch of RN- GRD in Ufa – BashNIPIneft, RF, Ufa)

Many hydrocarbon fields in Russia are currently in the late stages of development and are characterized by a low degree of remaining reserves. For effective additional study of deposits, it is necessary to improve various methodological approaches and work techniques. These will enable to refine the structure of geological objects and to identify areas of hydrocarbon fields not yet involved in development. The main method for studying the territory nowadays is seismic surveys. The accuracy of constructing surfaces of various horizons can vary within a fairly wide range, which depends on various factors and can be comparable to the amplitude of the identified structures. One of such factors is the zone of the upper part of the well section (ZUPS). The purpose of this work was to develop methodological approaches for analyzing ZUPS materials, structuring the obtained materials, identifying «pitfalls» while constructing lithological characteristics of this zone, and the possibilities of accounting for them when using time-varying data from historical well stock of the Republic of Bashkortostan. The solution to these issues became possible due to the involvement of materials from 16 license areas planned for seismic exploration, with an in-depth analysis of more than 12000 wells. Based on the work carried out, a technology for studying the ZUPS was obtained and tested for the first time as a preliminary stage in processing the acoustic signal within the framework of seismic exploration during the study of the Cenozoic-Paleozoic sedimentary cover.

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DOI: https://doi.org/10.1190/1.1440465