Vertical Dipole Electromagnetic Survey to Reduce Hydrocarbon Exploration Risk, Kakelborg - A Case Study

Kaffas, A.M. El; Frafjord, Ø.; Helwig, Stefan L.; Eide, Kjetil

doi:10.3997/2214-4609.20130737

Cited by 2 publications

(1 citation statement)

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“…An example for a successful campaign is shown on figure 4. The inversion result of the Kakelborg prospect (Kaffas et al 2013) is presented overlaid with the deep induction log result. Both show a distinctive change in resistivity around 1100 m depth.…”

Section: Methods And/or Theorymentioning

confidence: 99%

Rotate your Dipoles by 90 Degree - the Vertical CSEM Approach

Helwig¹,

Børven²,

Eide³

et al. 2014

Proceedings

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SUMMARYThe acronym CSEM has widely become synonymous for frequency domain Controlled Source ElectroMagnetics with seabed nodes and horizontal towed dipole transmitters. While this incarnation of marine CSEM is certainly the best known CSEM variant, it is not necessarily always the best option for acquisition over a certain prospect. Based on numerical modelling the differences between horizontal FD CSEM and vertical TD CSEM for given models were explored. The results show that time domain CSEM with vertical transmitter and vertical receiver dipoles is a viable alternative that provides high sensitivity, high depth of penetration as well as low disturbance by air wave and 3D structures. It's much smaller transmitter receiver distance creates an advantage in lateral resolution as well as in the detection of narrower or smaller structures. Case studies with comparisons between inverted vertical-vertical CSEM data and well log results show the real world usefulness of the method as well as the necessity for close integration of the results with other geophysical data. We argue that the marine CSEM landscape will become more divers and that acquisition layout and methodology for a given target needs to be evaluated on a case by case basis to achieve optimum results.

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Section: Methods And/or Theorymentioning

confidence: 99%