Transient Electromagnetic Sounding of Bazhenov Formation from Lower Cretaceous and Jurassic Reservoirs Penetrated by Deviated and Horizontal Wells

Никитенко, М. Н.; Эпов, М.И.; Глинских, В.Н.; Сухорукова, К. В.; Gornostalev, D. I.; Mikhaylov, I. V.

doi:10.3997/2214-4609.202157059

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“…Transient electromagnetic method, time-and frequency-domain measurements, signal transformation, primary field, fast inversion ВВЕДЕНИЕ Метод переходных процессов (МПП) имеет большие перспективы во многих задачах как промысловой, так и экологической геофизики. Среди них: геонавигация [Tabarovsky et al, 1996;Никитенко и др., 2021а;Никитенко, Мосин, 2022], дефектоскопия обсадных колонн скважин [Сидоров, 1996; Эпов и др., 2002], картирование баженовской свиты [Никитенко и др., 2021б; Эпов и др., 2021, 2022], мониторинг резервуаров , мониторинг состояния криолитозоны [Glinskikh et al, 2021] и другие. Для количественного определения электрофизических параметров исследуемой среды зарегистрированные данные инвертируются.…”

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Tem signal transformations to frequency domain for fast data inversion

Никитенко

2022

Russian Journal of geophysical technologies

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The paper presents a new data inversion technique for the transient electromagnetic method (TEM) by converting the measured signals into the frequency domain. The inversion involves a search for such earth model parameters that there is a consistency between the synthetic and field data. We use an optimization method, where through numerical simulation at each iteration the synthetic data are determined in accordance with the changing model parameters. Numerical simulation of TEM signals is a computationally expensive procedure, since the time-domain signal is usually calculated via the inverse Fourier transform of the frequency signal. Consequently, compared to the frequency signal, the time needed to calculate the time signal increases hundreds of times. It is proposed to transform the measured signals into the frequency domain and perform inversion therein, which significantly reduces the time expenditures. Transition into the frequency domain by the Fourier transform includes the extraction of the primary field from the signal, calculated by means of a special algorithm. This fact makes it possible to employ for the transformation a relatively small time interval actually used in TEM instead of an infinite one.

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Tem signal transformations to frequency domain for fast data inversion

Никитенко

2022

Russian Journal of geophysical technologies

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Transient Electromagnetic Sounding of Bazhenov Formation from Lower Cretaceous and Jurassic Reservoirs Penetrated by Deviated and Horizontal Wells

Cited by 1 publication

References 0 publications

Tem signal transformations to frequency domain for fast data inversion

Tem signal transformations to frequency domain for fast data inversion

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