An integrated approach to geothermal reservoir studies (case study of the Bolshe-Bannoye field, Kamchatka peninsula)

UDK: 543.4:5.44.2

DOI: 10.24887/0028-2448-2025-8-36-40

Key words: geothermal field, integrated approach, geophysical data

Authors: D.V. Bek (ZN NTC LLC, RF, Moscow); M.Yu. Podberezhny (ZN NTC LLC, RF, Moscow); O.V. Troshin (ZN NTC LLC, RF, Moscow); E.K. Khmarin (ZN Geotherm LLC, RF, Moscow); T.S. Baranov (Zarubezhneft JSC, RF, Moscow)

In the exploration and prospecting of geothermal resources, the best practices of exploratory geophysics are usually employed such as regional gravity and magnetic surveys, engineering and ore geophysics, geophysical methods used in oil and gas exploration, and seismic activity monitoring techniques. By integrating various data, a multi-scale subsurface geological and geophysical model is obtained, which ranges from a few meters to several kilometers in depth. The following article presents an approach to the integrated interpretation of geophysical data results, which involves combining electrical, seismic and well logging methods to study the subsurface at different scales (from several meters to tens of kilometers) using the Bolshoye Bannoye geothermal field as a case study. Through the deep analysis of both archival and new geophysical data from the Bolshoye Bannoye site, seismic anomalies, resistivity anomalies, presumed zones of decompression, and disjunctive faults were identified. It is hypothesized that these anomalies share a common origin, potentially related to geothermal transformations. It is important to note that a comprehensive study of the geothermal section enables a comparative analysis of anomalies identified through the geophysical data. As a result, multi-scale methods, sometimes based on different measurement principles, supplement each other, making the analysis more thorough and robust.

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