Pgs Geophysical As

Eivind Rödnes Vesterås

Philip Heelan

Maiza Bekara

Allan McKay

Tashi Tshering

A marine survey node can include a body to be deployed to a seabed, a marine survey receiver coupled to the body and to acquire marine survey data, and a soil sample module associated with the body to collect a soil sample from the seabed. A soil sample module can include a vessel, a first valve coupled to the vessel, and a spike coupled to the vessel. The spike can penetrate an earth surface. The first valve can maintain a pressure difference between the vessel and the spike when closed and equalize a pressure between the vessel and the spike when open. An inlet in the spike can equalize pressure between an inside of the spike and an outside of the spike and to collect a soil sample from the earth surface.

Marine survey node and soil sample module

Inversion of enhanced-sensitivity controlled source electromagnetic data can include approximating a background response from measured controlled source electromagnetic (CSEM) response data. The approximation can include performing a first inversion of the CSEM response data using a largest singular value in a diagonal of a matrix associated with the CSEM response data to create a first resistivity model of a subsurface of a subterranean formation and iteratively performing subsequent inversions while increasing an amount of singular values in the diagonal to obtain modeled CSEM response data to create a second resistivity model of the subsurface of the subterranean formation. Inversion of enhanced-sensitivity controlled source electromagnetic data can further include storing results of the first inversion and the iterative subsequent inversions producing a resistivity map based on the first and the second resistivity models.

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Oslo, Norway

Eivind Rödnes Vesterås