Hydrocarbon detection through induced polarization: Case study from the Frigg area

Flekkøy, Eirik Grude; Legeydo, P.; Håland, Endre; Drivenes, G.; Kjerstad, Jostein

doi:10.1190/segam2013-0929.1

Cited by 5 publications

(11 citation statements)

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“…S5) in the subsea environment. This is contrasted with an observed 0.5-5 seconds relaxation time or f c ∼ 1 Hz, attributed to presence of pyrites associated with hydrocarbon seepage above a known hydrocarbon reservoir 7 . Based on our quantitative model, generating this signature with solid (nonporous) pyrite would require the presence of meter-sized solid pyrite grains (with σ m ∼ 0.2S/m and C 0 ∼ 30 μF/cm 2 ).…”

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confidence: 60%

“…As a key electromagnetic-based geophysical exploration method [1][2][3][4][5] , induced polarization (IP) has been widely utilized in field-scale geophysical surveys for many decades [6][7][8][9] to provide information about the complex conductivity (chargeability) of subsurface formations filled with ionically conducting fluids. These surveys supplement controlled-source electromagnetic 2 and magnetotelluric 1,5 surveys, which generate subsurface resistivity maps.…”

mentioning

confidence: 99%

“…There are two distinct, commonly recognized mechanisms that give rise to complex conductivity in this low-frequency regime 4 : (1) diffusive relaxation of neutral modes associated with ionic concentrations, usually called "membrane polarization", and (2) capacitive charging of the electric double layer on the surfaces of non-ionic conductors, usually called "electrode polarization". Regardless of the dominant mechanism, frequency dependence of complex conductivity is typically fitted to a Cole-Cole type model 10 as the basis of various geophysical exploration methods [6][7][8][9][11][12][13][14][15][16][17][18] , where the effective complex conductivity of the porous media σ eff has the form 16 :…”

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confidence: 99%

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Quantifying Induced Polarization of Conductive Inclusions in Porous Media and Implications for Geophysical Measurements

Feng

Cameron

et al. 2020

Sci Rep

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induced polarization (ip) mapping has gained increasing attention in the past decades, as electrical induced polarization has been shown to provide interesting signatures for detecting the presence of geological materials such as clay, ore, pyrite, and potentially, hydrocarbons. However, efforts to relate complex conductivities associated with ip to intrinsic physical properties of the corresponding materials have been largely empirical. Here we present a quantitative interpretation of induced polarization signatures from brine-filled rock formations with conductive inclusions and show that new opportunities in geophysical exploration and characterization could arise. initially tested with model systems with solid conductive inclusions, this theory is then extended and experimentally tested with nanoporous conductors that are shown to have a distinctive spectral ip response. Several of the tests were conducted with nano-porous sulfides (pyrite) produced by sulfate-reducing bacteria grown in the lab in the presence of a hydrocarbon source, as well as with field samples from sapropel formations. Our discoveries and fundamental understanding of the electrode polarization mechanism with solid and porous conductive inclusions suggest a rigorous new approach in geophysical exploration for mineral deposits. Moreover, we show how induced polarization of biologically generated mineral deposits can yield a new paradigm for basin scale hydrocarbon exploration.

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confidence: 99%

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confidence: 99%

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Quantifying Induced Polarization of Conductive Inclusions in Porous Media and Implications for Geophysical Measurements

Feng

Cameron

et al. 2020

Sci Rep

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“…This property is used to detect anomalies of induced polarization (IP) in seafloor layers when mapping prospective HC reservoirs. (Holten et al 2010;Legeydo et al 2011;Flekkøy et al 2013). In the VEB-E z (t) method, the IP effect is manifested in the responses at small offsets (R ß 0.1 km-0.6 km) and decreases rapidly with increasing R. Figure 12 presents the transient responses calculated for a 1D layered medium and the Cole-Cole polarization model (Pelton 1983):…”

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confidence: 99%

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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“…Одной из технологий морской электроразведки, нацеленной на поиск углеводородов, является дифференциально-нормированный метод электроразведки (ДНМЭ) (Flekkøy et al 2013, Maver et al 2015, Veeken et al 2009), который основан на изучении электромагнитного поля во временной области. При использовании этой технологии основной предпосылкой обнаружения месторождений углеводородов является наличие ореолов повышенной поляризуемости, образующихся вследствие миграции углеводородов над залежами в верхнюю часть геологического разреза и ограниченных сверху геохимическим барьером.…”

Section: Introductionunclassified

The Approach to Parametric Multidimensional Inversion of Marine Electrical Prospecting Data Considering Bathymetry

Persova¹,

Soloveichik²,

Vagin³

et al. 2017

Proceedings

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SUMMARYThis paper proposes the approach to multidimensional inversion of the marine electrical prospecting data in the time-domain, which are obtained using the Differential Normalized Method of Electrical Investigation (DNME). This approach is based on the parametric (model-based) nonlinear multidimensional inversion with the simultaneous recovery of the borders coordinates of the 3D inhomogeneities and their electrophysical properties (electrical conductivity and polarizability). The solution of forward problems and calculation of the field of the impact of geoelectrical model parameters are performed with the use of the finite element method. The inversion is carried out in two stages including the division of measured signals into the electrodynamic component and signals of the induced polarization field. The subhorizontal borders of structural parts of the geoelectrical model can be either fixed (for example, according to the sea depth variations or borders, obtained by seismic methods) or recovered. The possibilities of the proposed approach are shown with the use of synthetic data for the generalized geoelectrical model which was constructed on the basis of the results of the DNME data interpretation obtained in several sea areas.

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Hydrocarbon detection through induced polarization: Case study from the Frigg area

Cited by 5 publications

References 1 publication

Quantifying Induced Polarization of Conductive Inclusions in Porous Media and Implications for Geophysical Measurements

Quantifying Induced Polarization of Conductive Inclusions in Porous Media and Implications for Geophysical Measurements

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

The Approach to Parametric Multidimensional Inversion of Marine Electrical Prospecting Data Considering Bathymetry

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