High-Resolution Airborne FTG: Unlocking Onshore India's Subsurface Potential

Airborne full tensor gradiometry mapping the fault systems and structural trends of India's onshore rift basins, using a proven Nevada analogue, for hydrocarbon, mineral, and geothermal exploration.
Client :
Confidential
Location:
Barmer-Sanchor Rift System and onshore basins across India
Service Image
Overview

Even in mature exploration basins across onshore India, areas of sparse or low-quality seismic and ground geophysical data can stall critical projects. Legacy surveys are limited by slow acquisition speeds, poor terrain access, and station spacing that often stretches beyond two kilometres. Samit deployed airborne FTG, via Basler BT67 aircraft, to measure gravity gradients continuously across the target regions, mapping structural information from regional tectonic elements down to prospect-scale fault systems.

The Challenge

Legacy geophysical surveys provided limited structural understanding. Ground gravity data was constrained by station spacing and levelling precision. Operators needed a rapid way to bridge the scale gap between broad regional gravity and high-resolution seismic, and to reduce exploration uncertainty across frontier, emerging, and mature assets alike.

Our Approach

Survey design was customised to each asset's stage of maturity:

  • Frontier stage (basin identification): 4-8 km line spacing
  • Emerging stage (mapping structural trends): 1-2 km line spacing
  • Mature stage (targeting specific prospects): 200-500 m line spacing for maximum resolution

The Barmer-Sanchor Rift System in India shares a remarkably similar tectonic evolution with the Basin and Range Province in Nevada, US, both shaped by continental extension, lithospheric thinning, and normal faulting. Because these density-controlled structural features are identical across both regions, the FTG techniques already proven in Nevada's energy and mineral exploration were applied directly to the onshore Indian basins. The resulting data provided superior, detailed imaging of blind relay ramps and faults, compared to calculated ground gravity and vintage seismic data.

Results
  • Superior, detailed imaging of blind relay ramps and faults compared to ground gravity and vintage seismic data
  • More reliable fault interpretations and additional structural features revealed, where ground gravity was limited by station spacing and levelling precision
  • A proven track record across the Assam Arakan Fold Belt, Upper Assam Area, Barmer and Cambay Rift Basins, Gulf of Cambay, Kutch Basin, Cauvery Basin, and Krishna Godavari Basin
  • Clearer basin architecture and fault geometry, letting clients confidently delineate hydrocarbon traps, identify mineral-hosting intrusions, and define geothermal frameworks
  • Survey resolution matched to exploration stage, from 4-8 km frontier screening to 200-500 m prospect-level targeting