Oslo-listed geophysical player TGS has unveiled plans to shoot one of the largest 3D seismic surveys ever executed offshore Brazil, as it targets new frontier acreage in the southern Pelotas basin.

TGS, through its subsidiary Spectrum Geo, submitted environmental studies to federal regulator Ibama to apply for a licence to carry out a massive campaign in the under-explored Pelotas basin encompassing 114,265 square kilometres.