Description

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🌍 Res2DInv 2026.2.1 — 2D Resistivity & IP Inversion Software (Seequent)

Turn electrical resistivity tomography (ERT) and induced polarisation (IP) surveys into reliable 2D Earth models — faster QC, cleaner IP decay, and georeferenced export into Oasis montaj and Leapfrog.

Res2DInv is the industry-standard Windows tool for 2D ERT/IP processing and inversion. Version 2026.2.1 is the current Seequent release: it builds on the 2026.2 workflow (crooked-section grids, full-decay IP, fixed regions, water surfaces) and ships a targeted import fix so inversion starts cleanly from instrument importers and specially formatted .dat files.

✅ Highlights of 2026.2 / 2026.2.1

• 🗺️ Export georeferenced crooked sections as Geosoft grids with spatial alignment kept in Oasis montaj and Leapfrog
• ⚡ Full-decay IP workflow — review, clean, and compare IP decay during QC without repeating earlier cleanup
• 🧩 Use fixed regions and water surfaces in model setup before inversion
• 🔁 Reuse inversion settings from existing results; undo the last processing step without restarting
• 🛠️ 2026.2.1 point release: fixed an import error that could appear during inversion when using instrument data importers or certain .dat formatting

🚀 What you can model

• Land, topography, borehole / cross-borehole, aquatic, and 2D time-lapse surveys
• Common and custom arrays (Wenner, dipole-dipole, pole-dipole, gradient, and more)
• Smooth, sharp, or constrained inversions with live pseudosection updates
• Typical uses: groundwater, contamination, geotech, cavities, saltwater intrusion, near-surface minerals

💡 Interesting fact

Res2DInv started as Dr M.H. Loke’s Geotomo classic, moved through Aarhus GeoSoftware, and is now a Seequent (Bentley) product with Seequent ID licensing. Field teams such as Living Water International use it to decide before drilling whether a formation is water-bearing or compromised by saltwater. Typical 100-electrode inversions finish in minutes on a modern PC.

💻 Official system requirements (Res2DInv)

Notes: extra cores help most from 4→16; requirements scale with dataset size. Current version 2026.2.1; supported line includes 2026.2.1 down to 5.0.0.

🐛 Bug fix in 2026.2.1

Import/inversion crash path when loading via instrument importers or specific .dat layouts is resolved.

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“2026.2.1 is the Res2DInv we actually want in production. Full-decay IP QC is finally usable, crooked lines export into montaj/Leapfrog without fighting coordinates, and the import fix stopped a .dat failure that used to halt inversion. Fast, stable, and still the default 2D ERT/IP engine for groundwater and geotech work.” — Senior near-surface geophysicist (sample store review)