Fullagar Geophysics VPem3D 3.4

Fullagar Geophysics VPem3D 3.4

Fullagar Geophysics VPem3D 3.4 is a high-performance, integrated software suite for the 3D inversion and forward modeling of frequency- and time-domain electromagnetic (EM) data, as well as potential field data (gravity and magnetics). Developed by Dr. David Fullagar and his team, it is renowned for its robust, physics-driven algorithms capable of handling complex, large-scale survey data from systems like VTEM, TEMPEST, SkyTEM, and ground-loop EM. The software converts geophysical survey measurements into 3D subsurface models of electrical conductivity/resistivity, aiding in the direct detection of ore bodies, groundwater resources, or geological structures.

Key Features & Capabilities

Core Inversion & Modeling Engine

• Multi-Physics 3D Inversion: Simultaneous or joint inversion of:

  • Time-Domain EM (TDEM) and Frequency-Domain EM (FDEM) data

  • DC Resistivity & Induced Polarization (DC/IP) data

  • Gravity & Magnetic data

• Advanced Regularization: Flexible model regularization options (smooth, focused, layered) to incorporate geological prior knowledge and produce geologically plausible models.

• Unstructured Tetrahedral Meshing: Allows for complex topography, irregular geology, and efficient model discretization around sources and receivers, reducing computational load.

• Borehole EM Modeling: Full support for modeling and inverting surface-to-borehole and borehole-to-borehole EM configurations.

Data Processing & Integration

• Wide Format Support: Direct import of raw and processed data from major contractor systems (e.g., Geotech, SkyTEM, Spectrem, Crone).

• Robust Error Estimation & Data Weighting: Tools to assign realistic errors to data channels, crucial for producing reliable inversion results.

• Integration with Geological Models: Ability to import and use wireframe surfaces (from GOCAD, Leapfrog, Surpac) as constraints or starting models for inversion.

• Sensitivity & Resolution Analysis: Tools to assess which parts of the recovered 3D model are well-constrained by the data.

Visualization & Interpretation

• Interactive 3D Viewer: Visualize 3D conductivity/resistivity isosurfaces, data misfit, and sensitivity volumes.

• Comparative Section Slicing: Slice and dice the 3D model alongside geological cross-sections and drillhole data.

• Forward Modeling & Appraisal: Simulate the EM response of a hypothetical geological model for survey planning or hypothesis testing.

 What’s New in VPem3D 3.4

Version 3.4 focuses on performance, cloud capabilities, and usability enhancements:

1. GPU-Accelerated Inversion: New optional module leverages NVIDIA CUDA technology to dramatically speed up the computationally intensive forward modeling step, reducing inversion times from days to hours for large datasets.

2. VPemCloud Integration: New workflow to offload heavy inversions to Fullagar’s secure cloud HPC servers, eliminating the need for expensive local computing hardware.

3. Enhanced Stochastic Inversion: Improved tools for Monte Carlo-type ensemble inversions to better quantify model uncertainty and non-uniqueness.

4. Streamlined UX for Common Tasks: Redesigned wizards for setting up standard survey types (e.g., airborne TEM, ground gradient array IP), reducing setup time for routine projects.

5. Advanced IP Modeling: Extended Debye model capabilities for more sophisticated spectral IP (SIP) inversion and interpretation.

6. Improved 3D Viewer: Faster rendering and new tools for creating high-quality figures and animations for reporting.

🖥️ System Requirements

Minimum Requirements (Small Projects)

• OS: Windows 10 Professional 64-bit (21H2 or later)

• CPU: Intel Core i7-10700 or AMD Ryzen 7 3700X (8 cores / 16 threads)

• RAM: 32 GB

• GPU: NVIDIA GeForce GTX 1660 Super (6GB VRAM) – for display only

• Storage: 500 GB NVMe SSD + 2 TB HDD for data

• Network: Internet connection for cloud option and license validation

Recommended Requirements (Professional Production Use)

• OS: Windows 11 Pro for Workstations or Windows 10 Pro

• CPU: AMD Ryzen Threadripper PRO 5965WX (24-core) or Intel Core i9-13900K. For local inversions, high core count is critical.

• RAM: 128 GB – 256 GB (Inversion mesh size is directly limited by RAM)

• GPU: NVIDIA RTX 4090 (24GB VRAM) or RTX A6000 (48GB VRAM) for GPU-accelerated inversion module. This is a major performance investment.

• Storage: 1 TB NVMe SSD (PCIe 4.0) for OS/software + 10+ TB RAID array for project data.

• Cloud Alternative: For large projects, the VPemCloud service is strongly recommended, reducing local hardware needs to a capable desktop for pre/post-processing.