Petrophysical interpretation of time-lapse electromagnetic sounding in wells

Yeltsov, I. N.; Нестерова, Галина Владимировна; Kashevarov, A. A.

doi:10.1016/j.rgg.2011.05.009

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…e numerical characteristic parameters can be obtained by formulas (11) and (12), as shown in Table 2. e trends of the numerical characteristic parameters at different levels are shown in Figure 12 and 13.…”

Section: Extraction Of Characteristic Parametermentioning

confidence: 99%

“…e VBTEM is based on improved detection by the transient electromagnetic method (TEM) in many engineering applications, such as geological advance prediction of tunnels, underground gas storage, and metal mineral exploration [7][8][9][10][11][12][13][14]. e VBTEM has the common characteristics of transient electromagnetic in other fields, but also has its differences, which means that some issues need to be discussed before applying VBTEM technology into operational tunnels.…”

Section: Introductionmentioning

confidence: 99%

“…Firstly, ground TEM and aviation TEM usually work on half-space problems [7,9], but like mine TEM and tunnel TEM, VBTEM often considers full-space problems. Furthermore, there may be enough planes or spaces to layout the transmitter and receiver coils in other TEM applications [8,11,13], whereas VBTEM only has a limited space depended on the size and form of the tunnel cross section, and thus, the size of the coils is constrained and only a limited number of measurement points can be measured. Finally, the detection distance of the low-resistivity target of VBTEM is different from the traditional TEM.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Vehicle-Borne Transient Electromagnetic Numerical Characteristic Parameter of Water-Bearing Body behind Tunnel Linings

Qian

Liang

et al. 2020

Mathematical Problems in Engineering

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The water-bearing body (WBB) behind tunnel linings has been some of the main causes of damage in operational tunnels. The WBB directly affects the serviceability state of tunnel linings; thus, determining a method to detect this problem is a widely studied issue regarding tunnel maintenance. In this paper, a vehicle-borne transient electromagnetic method (VBTEM) is put forward for the first time to detect WBB behind tunnel linings, and the aim is to fully investigate the transient electromagnetic response and numerical characteristics of the WBB behind tunnel linings. Firstly, the transient electromagnetic response curves of the WBB and surrounding rock are obtained and compared in detail by using the finite element method. Then, taking the distance, thickness, radius, and resistivity of the WBB as variable parameters, the parametric sensitivity rule of the response curve of the WBB is analyzed. Finally, a dimensionless response curve is proposed, a mathematical extraction equation is established, and seven numerical characteristic parameters are proposed and extracted. Based on seven numerical characteristic parameters, the technical parameters of the VBTEM equipment are put forward. The results illustrate that the transient electromagnetic response of the WBB is obviously different from that of surrounding rock. The seven numerical characteristic parameters of the dimensionless curve of the WBB can represent the entire response curve of the WBB. The results reveal that the first time gate of the VBTEM equipment needs to be less than 0.05 μs for short-distance problem, and the time span needs to reach four time spans at least. The research results can provide valuable technical references for the application of VBTEM.

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Section: Extraction Of Characteristic Parametermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Vehicle-Borne Transient Electromagnetic Numerical Characteristic Parameter of Water-Bearing Body behind Tunnel Linings

Qian

Liang

et al. 2020

Mathematical Problems in Engineering

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Processing high-frequency electromagnetic logs from conducting formations: linearized 2D forward and inverse solutions with regard to eddy currents

Глинских

Никитенко

Эпов

2013

Russian Geology and Geophysics

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High-performance algorithms and software have been designed for fast 2D forward modeling and inversion of high-frequency electromagnetic logs to recover the patterns of electrical conductivity and relative permittivity (dielectric constant) of rocks. Forward modeling implies linear representation, with regard to eddy current, of attenuations and phase shifts of electromagnetic fields propagating in 2D conducting formations. In order to improve the modeling quality, the background model is chosen proceeding from the eddy current pattern in a heterogeneous subsurface. The inverse solution is obtained by pseudoinversion of the sensitivity matrix of relative amplitudes and phases. Joint 2D inversion of phase shifts and attenuations improves the reliability of the inferred spatial conductivity distribution and allows estimating permittivity. The reported numerical experiments on inversion of synthetic and field EM logs prove the possibility of estimating the permittivity of complex terrigenous and carbonate reservoirs with water- and oil-filled porosity.

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Geomechanics and fluid flow effects on electric well logs: multiphysics modeling

Yeltsov

Nazarova

Nazarov

et al. 2014

Russian Geology and Geophysics

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Coupled geomechanic and fluid flow analysis is applied to develop theoretical and experimental background for geosteering and well logging to diagnose the state of near-wellbore formation and oil reservoir. The suggested methods of processing EM induction (VIKIZ) and Russian laterolog (RLL) resistivity responses account for effects of stress-dependent fluid flow changes. The geomechanic and fluid-flow effects on resistivity well logs are investigated for the case of asymmetric invasion and related irreversible deformation. Ways of taking into account stress-dependent effects on resistivity logs are developed on the basis of 3D modeling of geomechanic and electromagnetic fields.

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Petrophysical interpretation of time-lapse electromagnetic sounding in wells

Cited by 6 publications

References 7 publications

Vehicle-Borne Transient Electromagnetic Numerical Characteristic Parameter of Water-Bearing Body behind Tunnel Linings

Vehicle-Borne Transient Electromagnetic Numerical Characteristic Parameter of Water-Bearing Body behind Tunnel Linings

Processing high-frequency electromagnetic logs from conducting formations: linearized 2D forward and inverse solutions with regard to eddy currents

Geomechanics and fluid flow effects on electric well logs: multiphysics modeling

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