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electromagnetic profiles

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Examples of <b>electromagnetic</b> <b>profiles</b> with magnetite enrichment in Holocene ...
Published: 29 June 2018
Figure 6. Examples of electromagnetic profiles with magnetite enrichment in Holocene fine sand (water depth corresponds to distance from the shore). Thick horizontal lines denote the depth where the bed shear stress under average wave conditions exceeds the critical shear stresses τ cr of quartz
Example <b>electromagnetic</b> <b>profiles</b> (from  Cuthbert  et al.  2009 ).
Published: 04 April 2018
Fig. 4. Example electromagnetic profiles (from Cuthbert et al. 2009 ).
1D inversion result of the aero-<b>electromagnetic</b> <b>profile</b> crossing the survey...
Published: 01 March 2017
Figure 10.  1D inversion result of the aero-electromagnetic profile crossing the survey area using 5 frequencies leading to different investigation depths. The UAS-VLF survey area is marked in the box around 2 km.
Site 3. (a) Schematic trench cross-section. (b) <b>Electromagnetic</b> <b>profiling</b> (...
in > Geophysics
Published: 11 July 2000
F IG . 7. Site 3. (a) Schematic trench cross-section. (b) Electromagnetic profiling (EM). (c) Electrical tomography. (d) Radar section (50 MHz).
Journal Article
Journal: Geophysics
Published: 01 October 1991
Geophysics (1991) 56 (10): 1543-1552.
...Ken Duckworth; H. T. Calvert; John Juigalli Abstract An approximate method for deriving conductor depth estimates from the geometry of horizontal coplanar coil Slingram type electromagnetic profiles is based on a transformation of the recorded profile to a form which is free of the influence...
Journal Article
Journal: Geophysics
Published: 29 March 2000
Geophysics (2000) 65 (5): 1489-1494.
... data calculated directly. Further experimental work compares induction-coil magnetic-field data collected along a profile with data measured using a SQUID magnetometer. These two electromagnetic profiles look similar, and a comparison of the decay curves at a critical point on the profile shows...
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Journal Article
Journal: Geophysics
Published: 11 March 2015
Geophysics (2015) 80 (2): WA127-WA134.
...Zhanxiang He; Zuzhi Hu; Yan Gao; Lanfang He; Cuixian Meng; Lunkai Yang ABSTRACT We have carried out a field trial of a time-lapse continuous electromagnetic profile (CEMP) method for monitoring gas reservoir development. Several data acquisition methods were tested to establish a field-worthy...
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Series: Investigations in Geophysics
Published: 01 January 1987
DOI: 10.1190/1.9781560802631.ch6
EISBN: 9781560802631
... aids in interpretation of electromagnetic profiling data. However, scale model results are seldom used directly in interpretation of soundings because data that cannot be fit with layered earth models are not interpreted quantitatively and because develpment of analytic solutions and computational...
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Journal Article
Journal: Geophysics
Published: 01 February 1966
Geophysics (1966) 31 (1): 167-184.
... to electromagnetic field data as well. This hypothesis has been tested by using continuation to interpret 20 electromagnetic profiles, involving a variety of theoretical, model, and field data. It has been found that the depths to the tops of the anomaly-causing bodies can be determined with acceptable accuracy...
Journal Article
Journal: Geophysics
Published: 10 September 2010
Geophysics (2010) 75 (4): Z79.
... in-situ mapping of the magnetic and electric signatures of marine near-surface sediments. A marine electromagnetic profiler has been developed for coastal and shelf operations in 5 to 500 m water depths. The system was designed to resolve subtle and gradual variations in silt and clay content, porosity...
Journal Article
Journal: Geophysics
Published: 27 July 2016
Geophysics (2016) 81 (5): E323-E336.
...Daeung Yoon; Michael S. Zhdanov; Johan Mattsson; Hongzhu Cai; Alexander Gribenko ABSTRACT One of the major problems in the modeling and inversion of marine controlled-source electromagnetic (CSEM) data is related to the need for accurate representation of very complex geoelectrical models typical...
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Journal Article
Published: 01 June 2006
Journal of Environmental and Engineering Geophysics (2006) 11 (2): 151-156.
..., while scalar measurements of the electrical and magnetic field components were used in the CSAMT method. The relevant electrical properties of the earth were extracted from the electromagnetic profiles. High frequency EM has high resolution in the shallow earth but a smaller depth of exploration, while...
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Journal Article
Journal: The Leading Edge
Published: 01 October 2002
The Leading Edge (2002) 21 (10): 972-982.
... to the petroleum industry. Seismic methods have traditionally been used in this context, but the results can be ambiguous. Another approach is to use electromagnetic sounding methods that exploit the resistivity differences between a reservoir containing highly resistive hydrocarbons and one saturated...
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Journal Article
Published: 01 August 2005
Vadose Zone Journal (2005) 4 (3): 551-557.
... is governed by the electromagnetic field profile of the guided wave. The analytical treatment presented in the appendix assumes the electrode of the SRP to be a section of an infinitely long rod embedded in a low-loss medium with a homogeneous dielectric constant ε r and a homogeneous permeability μ = μ 0...
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Journal Article
Journal: Geophysics
Published: 25 January 2010
Geophysics (2010) 75 (1): B25-B33.
... electromagnetic profiling (CEMP). Electric logs indicate that gas-bearing formations have high resistivity relative to nongas-bearing formations. Obvious resistivity anomalies derived from MT sounding curves are interpreted to come from gas-bearing formations; we observed no such anomalous resistivity away from...
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Series: Investigations in Geophysics
Published: 01 January 1990
DOI: 10.1190/1.9781560802785.2.ch17
EISBN: 9781560803645
... histories are the self-potential method, electrical and resistivity profiling (including pole-dipole), and electromagnetic profiling. Also included in the methodology are measurements of borehole and surface seep water conductivity and temperature. Geophysical methods which play a supporting role...
Series: Investigations in Geophysics
Published: 01 January 1990
DOI: 10.1190/1.9781560802785.3.ch10
EISBN: 9781560803652
... on these premises led to a survey methodology which used transient electromagnetic profiling to locate potentially hazardous areas, followed by detailed measurements of seismic compressional and shear velocity and amplitude attenuation to delineate drilling targets. ...
Journal Article
Journal: Geophysics
Published: 01 January 1983
Geophysics (1983) 48 (1): 42-51.
...C. J. Villegas-Garcia; G. F. West Abstract An analog modeling program was conducted to investigate the electromagnetic (EM) response of nonuniform conductive overburden layers with the horizontal loop technique of geophysical prospecting. Several characteristics of the response that will help...
Journal Article
Journal: Geophysics
Published: 01 December 1996
Geophysics (1996) 61 (6): 1624-1632.
... of salt profiles are known to indicate the relative magnitude of recharge. These profiles may be differentiated by their resistivity structure. Since a broadband airborne electromagnetic (AEM) method offers the possibility of readily obtaining resistivity soundings, modeling was carried out to investigate...
Journal Article
Journal: Geophysics
Published: 29 August 2017
Geophysics (2017) 82 (6): G101-G114.
... ) . The important property of function E σ ( ρ i ) is that it is a monotonically increasing function. Figure 2. Model 1. (a) Predicted gravity field (solid line) versus synthetic gravity field G z (dotted line) along the profile at Y = 3500    m (northing). (b...
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