Minimizing the Noise Contribution in Vertical Electric Field Measurements

Frafjord, Ø.; Holten, T.; Kaffas, A.M. El; Børven, Jon-Mattis; Helwig, Stefan L.

doi:10.3997/2214-4609.20141247

Cited by 3 publications

(4 citation statements)

References 2 publications

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“…The methods of stabilization of receiving dipoles are constantly improving (Faynberg and Barsukov 2013). At the moment, the maximum tilt of receivers does not exceed ±0.1° ( Helwig et al 2013;Frafjord et al 2014). Such parameters of the VEB-E z (t) configuration guarantee the absence of distortion within 1% for offsets R = 0.5-3 km and sea depths of H w > 50 m and sediments resistivity to 7 Ωm caused by tilting of VEB and the receiver VED.…”

Section: T I L T S O F T H E E L E C T R I C L I N E S I N T H E Veb mentioning

confidence: 96%

Marine transient electromagnetic sounding of deep buried hydrocarbon reservoirs: principles, methodologies and limitations

Barsukov

Fainberg

2016

Geophysical Prospecting

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The possibility of a time‐domain electromagnetic sounding method using excitation and measurement of vertical electric fields to search for and identify deeply buried reservoirs of hydrocarbons offshore is investigated. The method operates on source–receiver offsets, which are several times less than the depth of the reservoir. Geoelectric information is obtained from the transient responses recorded in the pauses between the pulses of electric current in the absence of the source field. The basics of the method, as well as its sensitivity, resolution, and the highest accessible depth of soundings for various geological conditions in a wide range of sea depths, are analyzed. For the analysis, 1D and 3D geoelectric models of hydrocarbon reservoirs are used. It is shown that under existing technologies of excitation and measurement of vertical electric fields, the highest accessible depth of soundings can be up to 4 km. Technology for the inversion and interpretation of transient responses is demonstrated on experimental data.

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Section: T I L T S O F T H E E L E C T R I C L I N E S I N T H E Veb mentioning

confidence: 96%

Marine transient electromagnetic sounding of deep buried hydrocarbon reservoirs: principles, methodologies and limitations

Barsukov

Fainberg

2016

Geophysical Prospecting

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“…In both cases, the vertical component needs to be derived by a linear combination of at least three measured electrical fields as the seafloor can't be expected to be perfectly flat. Frafjord et al (2014) showed that the differences in noise between a true vertical recording and a mathematically rotated one can be significant as the horizontal E-field components are typically much noisier than the vertical component. Designs with gravitational verticality alignment, based on a hinged dipole with a large weight on the bottom (Kjerstad 2010), are impractical for larger operations due to their size and weight .…”

Section: Receiver Structurementioning

confidence: 99%

“…Frafjord et al . () showed that the differences in noise between a true vertical recording and a mathematically rotated one can be significant as the horizontal E‐field components are typically much noisier than the vertical component. Designs with gravitational verticality alignment, based on a hinged dipole with a large weight on the bottom (Kjerstad ), are impractical for larger operations due to their size and weight (Helwig et al .…”

Section: Receivermentioning

confidence: 99%

Vertical–vertical controlled‐source electromagnetic instrumentation and acquisition

Helwig¹,

Wood

Gloux

2019

Geophysical Prospecting

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Vertical–vertical controlled‐source electromagnetic is an alternative to other techniques for providing three‐dimensional resistivity images of the subsurface. It utilizes a large and powerful vertical dipole transmitter and arrays of E‐field receivers with vertical and horizontal dipole sensors. The necessary instrumentation and acquisition procedures which differ strongly from other controlled‐source electromagnetic methods are described in the paper.

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“…Consagrado, inclusive, por estudos substanciais para indicação direta de hidrocarbonetos (Sainson, 2012), o mCSEM (marine Controlled Source ElectroMagnetic) teve sua configuração de aquisição alterada por uma empresa norueguesa -Petromarker -afim de melhorar a resolução vertical e promover uma maior distinção entre corpos condutivos e resistivos (Frafjork et al, 2014;Holten et al, 2009a). Além de alterações instrumentais, a metodologia recebeu a mnemônica nomenclatura de VME (Vertical Marine Electromagnetic) e foi patenteada sob o nome TEMP-VEL (Transient ElectroMagnetic Prospecting with Vertical Electric Lines) (Gloux & Holten, 2009).…”

Section: Introductionunclassified