Fast-decaying inductively induced polarization in frozen ground: A synthesis of results and models

Kozhevnikov, N.O.; Antonov, Evgeny

doi:10.1016/j.jappgeo.2012.03.008

Cited by 26 publications

(24 citation statements)

References 30 publications

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“…If the earth is conductive and polarisable, IP currents add to the response, resulting in a phenomenon known as inductively induced polarization (IIP) (Kozhevnikov and Antonov 2012). In turning on and off the transmitter current, the vortex electric field arises around the transmitter line.…”

Section: N D U C T I V E L Y I N D U C E D P O L a R I Z A T I O Nmentioning

confidence: 99%

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Current and voltage source induced polarization transients: a comparative consideration

Kozhevnikov

Antonov

2017

Geophysical Prospecting

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The article discusses the excitation of transient induced polarization responses using current and voltage sources. The first method has found a wide application in induced polarization surveys and—directly or indirectly—in the theory of the induced polarization method. Typically, rectangular current pulses are injected into the earth via grounding electrodes, and decaying induced polarization voltage is measured during the pauses between pulses. In this case, only the secondary field is recorded in the absence of the primary field, which is an important advantage of this method. On the other hand, since the current injected into the ground is fully controlled by the source, this method does not allow studying induced polarization by measuring the current in the transmitter line or associated magnetic field. When energising the earth with voltage pulses, the measured quantity is the transient induced polarization current. In principle, this method allows induced polarization studies to be done by recording the transmitter line current, the associated magnetic field, or its rate of change. The decay of current in a grounded transmitter line depends not only on the induced polarization of the earth but also on the polarization of the grounding electrodes. This problem does not occur when induced polarization transients in the earth are excited inductively. A grounded transmitter line is a mixed‐type source; hence, for a purely inductive excitation of induced polarization transients, one should use an ungrounded loop, which is coupled to the earth solely by electromagnetic induction.

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Section: N D U C T I V E L Y I N D U C E D P O L a R I Z A T I O Nmentioning

confidence: 99%

“…In the case of conductive non-polarisable earth, these currents are usually referred to as "eddy currents". If the earth is conductive and polarisable, IP currents add to the response, resulting in a phenomenon known as inductively induced polarization (IIP) (Kozhevnikov and Antonov 2012).…”

Section: N D U C T I V E L Y I N D U C E D P O L a R I Z A T I O Nmentioning

confidence: 99%

Current and voltage source induced polarization transients: a comparative consideration

Kozhevnikov

Antonov

2017

Geophysical Prospecting

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“…Как известно, талые неконсолидированные породы отличаются от тех же пород в мерзлом состоя-нии , во-первых, более низким сопротивлением и, во-вторых, отсутствием или очень слабым проявлением быстропротекающей вызванной поляризации [Кожевников и др., 1995Агеев, 2012;Kozhevnikov, Antonov, 2012]. Поэтому логично было предположить, что талик в толще высокоомных поляризующих-ся пород должен проявляться как неполяризующийся слой пониженного сопротивления.…”

Section: оценка возможностей метода зсб при поисках таликов на основеunclassified

“…Как на речном, так и озерном марш-рутах постоянная времени «попадает» в диапазон от первых десятков до первых сотен микросекунд при среднем значении около 100 мкс, а показатель степени во всех случаях практически не отличается от единицы. Эти значения типичны для быстро устанавливающейся вызванной поляризации в мерзлых осадочных породах [Kozhevnikov, Antonov, 2012]. Однако графики τ 1 вдоль профилей свидетельствуют о том, что наличие или отсутствие талика не оказывает влияния на постоянную времени поляризацион-ного процесса.…”

Section: практические результаты съемок методом зсб на речном и озернunclassified

Tem Surveys for Search for Taliks in Areas of Strong Fast-Decaying Ip Effects

2014

GiG

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3 Сибирский научно-исследовательский институт геологии, геофизики и минерального сырья, 630091, Новосибирск, Красный просп., 67, Россия Важнейшим источником водоснабжения в северных регионах являются водонасыщенные талые породы среди мерзлых, называемые таликами. На фоне вмещающих мерзлых пород талики выделяются как зоны повышенной проводимости. Среди электроразведочных методов, которые могут использовать-ся для поисков таликов, привлекает внимание зондирование становлением поля в ближней зоне (ЗСБ). Одним из важных достоинств метода ЗСБ при изучении мерзлых толщ является отсутствие гальвани-ческих заземлений. В статье обсуждаются проблемы и результаты поисков таликов зон методом ЗСБ на территории Тазовского района Ямало-Ненецкого автономного округа. Измеренные здесь индукционные переходные характеристики на ранних временах подвержены сильному влиянию быстро устанавливаю-щейся индукционно-вызванной поляризации. Это делает невозможным изучение верхней части разреза путем интерпретации данных ЗСБ в рамках модели проводящей неполяризующейся среды. Инверсия данных ЗСБ с помощью программы «TEM-IP» на основе модели проводящей поляризующейся среды, удельная электропроводность которой описывается формулой Коул-Коул, позволила решить эту пробле-му. По данным ЗСБ, геоэлектрическая модель среды в районе исследований является преимущественно трехслойной. Верхний слой мощностью от 100 до 250 м -высокоомный и поляризующийся. Поляриза-ционные параметры слоя являются типичными для мерзлых осадочных пород. Присутствие в нем талика приводит к понижению эффективных сопротивления и поляризуемости слоя, что -как показали резуль-таты работ методом ЗСБ по озерному маршруту и последующего бурения -может быть использовано в качестве поискового признака.Мерзлота, талик, зондирование становлением поля, индукционно-вызванная поляризация, интер-претация. TEM SURVEYS FOR SEARCH FOR TALIKS IN AREAS OF STRONG FAST-DECAYING IP EFFECTSN.O. Kozhevnikov, E.Yu. Antonov, A.K. Zakharkin, and M.A. Korsakov Lenses of water-saturated unfrozen rocks (taliks) in permafrost are important sources of freshwater in high-latitude regions. Taliks stand out against the host frozen rocks in much lower resistivity and thus are detectable by resistivity surveys. TEM soundings are especially effi cient in this application as they can go without galvanic grounding, have small offsets, and are sensitive to buried conductors. Early-time TEM data in the Taz area of the Yamal-Nenets district bear strong effects of fast-decaying inductively induced polarization (IIP), which rules out the use of nonpolarizable earth assumption for their interpretation. The TEM responses are inverted by means of the TEM-IP software using the model of a polarizable earth with Cole-Cole complex frequencydependent conductivity. The resulting earth model mainly includes three layers, with a 100 to 250 m thick highly resistive polarizable upper layer. The polarization parameters of the layer (chargeability, time constant and exponent) are typical of frozen sedimentary rocks, while the presen...

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“…Ice and near-surface clays are known to be chargeable. Their presence distorts EM signals and impedes interpretation (Smith and Klein, 1996;Kozhevnikov and Antonov, 2012). As such, the existence of negative transients is usually considered to be "noise," and it is commonly referred to as IP contamination.…”

Section: Introductionmentioning

confidence: 99%

Inversion of airborne geophysics over the DO-27/DO-18 kimberlites — Part 3: Induced polarization

2017

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The geologically distinct DO-27 and DO-18 kimberlites, often called the Tli Kwi Cho (TKC) kimberlites, have been used as a testbed for airborne geophysical methods applied to kimberlite exploration. This paper focuses on extracting chargeability information from time-domain electromagnetic (TEM) data. Three different TEM surveys, having similar coincident-loop geometry, have been carried out over TKC. Each records negative transients over the main kimberlite units and this is a signature of induced polarization (IP) effects. By applying a TEM-IP inversion workflow to a versatile time domain EM (VTEM) data set we decouple the EM and IP responses in the observations and then recover 3D pseudo-chargeability models at multiple times. A subsequent analysis is used to recover Cole-Cole parameters. Our models demonstrate that both DO-18 and DO-27 pipes are chargeable, but they have different Cole-Cole time constants: 110 and 1160 μs, respectively. At DO-27, we also distinguish between two adjacent kimberlite units based on their respective Cole-Cole time constants. Our chargeability models are combined with the density, magnetic susceptibility and conductivity models to build a 3D petrophysical model of TKC using only information obtained from airborne geophysics. Comparison of this final petrophysical model to a 3D geological model derived from the extensive drilling program demonstrates that we can characterize the three main kimberlite units at TKC: HK, VK, and PK in three dimensions by using airborne geophysics.

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Fast-decaying inductively induced polarization in frozen ground: A synthesis of results and models

Cited by 26 publications

References 30 publications

Current and voltage source induced polarization transients: a comparative consideration

Current and voltage source induced polarization transients: a comparative consideration

Tem Surveys for Search for Taliks in Areas of Strong Fast-Decaying Ip Effects

Inversion of airborne geophysics over the DO-27/DO-18 kimberlites — Part 3: Induced polarization

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