Germany – Seismic processing services – Durchführung von Processing-Leistungen zur 3D-Seismik und Weitwinkelseismik-Messung, seismische Interpretation der Ergebnisse sowie Digitalisierung von geophysikalischen Bohrlochmessungen

SWE Energie GmbH (SWE E) is a company with a majority stake held by the Stadtwerke Erfurt Group. As part of the decarbonisation of the central district heating system of the city of Erfurt, SWE E is exploring deep geothermal potentials in the Erfurt area. To this end, SWE E conducted the BMWE-funded project "SeismikEFfizienz" as part of the "GeoEFfizienz, Deep Geothermal for Erfurt" project between February and June 2026. The background of this project is that the deep subsurface in the Liegenden of the Thüringer Becken is fully unexplored. The exploration target is the crystalline basement and is assigned to the area of the Mid-German Crystalline Zone (MDKZ). A possible deep geothermal reservoir could be found in the area of the Erfurt Fault Zone. Therefore, one focus of the seismic survey was the search for deep faults with a so-called wide-angle measurement. The second focus was on the areal characterisation of the transition layer and the overburden to optimise drilling planning. For this purpose, a 3D model is being developed. The survey area covered a total of 259.8 km² (136 km² 3D seismics plus 123.8 km² wide-angle measurement). A total of 14,326 source and 15,085 receiver points were carried out in the main survey area, as well as 4,722 additional receiver points for the wide-angle measurement (full spread: 19,576 geophones of the type Inova Quantum). The fold was over 400 with a bin size of 15 m x 15 m. The raw data volume amounts to approximately 92 TB of 3D data and approximately 6 TB of wide-angle data. The subject of the tender (Lot 2) is the processing and seismic interpretation of the data as well as the digitisation of borehole measurements. The scope of services includes in particular: • Data transfer and project management, • Data conditioning and preprocessing, • Standard processing, • Common-Reflection-Surface processing (CRS), • Pre-Stack time migration including velocity modelling and QC, • Pre-Stack depth migration, • Seismic interpretation of layer boundaries and faults to create a 3D structural model as well as • Digitisation of borehole measurements. The bidder must submit a technical processing concept (max. 20 pages) which serves for the qualitative evaluation of the offer and can be freely designed in its representation. The concept must in particular map the aforementioned processing steps as well as the seismic interpretation of the data set in a comprehensible manner and ensure the best possible representation of steeply dipping deep faults as well as a reliable velocity model. CRS, Pre-Stack time migration and Pre-Stack depth migration must be specified separately in the offer in terms of content and price. The results of the individual processing steps, in particular from standard processing, CRS processing, Pre-Stack time migration and Pre-Stack depth migration, must be delivered as independent, documented data sets. The specific delivery and data formats for processing and interpretation results can be found in the tender documents. The interpretation is to be delivered as a 3D structural model with all layer boundaries and fault surfaces, including all underlying horizon picks and fault sticks in a comprehensible, modelable form. The service is provided in coordination with the AG; interim reports are planned. The results are to be handed over by 31 August 2027. Permitting and the survey campaign were awarded as Lot 1 to Geofizyka Torun. The results of the 3D seismics will be incorporated into the planning and implementation of a subsequent exploration well. For this purpose, a reliable 3D structural model will be developed, which will provide information on fault zones, optimise the drilling path and thus reduce the drilling risk.