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Keywords: dipole
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Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, August 28–September 1, 2022
Paper Number: SEG-2022-3746002
.... Magnetic field receivers offer an opportunity to reduce the form factor of the survey and increase the mobility by utilizing upcoming technologies, such as drones. We explore the use of frequency-domain electric dipole sources with a focus on measuring the secondary magnetic field at the surface...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594913
... increasing the currents put in the ground, thereby increasing the depth of investigation and resolution. It can easily work around obstacles that do not allow for easy cable management as multiple physically independent lines can be operated together. dipole information transmitter ralf birken...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3422838
... Acoustic wave fields in boreholes are often dominated by the fundamental modes. For example, the fundamental flexural and quadrupole modes often dominate the field generated by dipole and quadrupole sources, respectively. Formation elastic properties are typically estimated from these modes...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427983
... Given a zero-level curve (also called the zero-level contour) in a measured magnetic fieldr, one can infer and invert for the location and orientation of the source dipole. While this method has been studied for static magnetic fields, the same idea can be applied to time-varying magnetic fields...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427957
... involve injecting alternating electric current into the Earth through long transmitter dipoles, and making measurements of the Earth’s response at an array of EM receivers. Historically, CSAMT data have been interpreted using readily available MT modeling algorithms, but this means using only the data...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3214945
... ABSTRACT Multipole sources such as dipole or quadrupole are routinely utilized by modern borehole acoustic array tools not only for shear slowness measurement in slow formations, but also in numerous advanced applications ranging from azimuthal anisotropy analysis to single-well acoustic...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216745
... a planar layer of dipoles having an uniform magnetization direction. It can be shown that this distribution is all-positive if the magnetization direction of the dipoles is equal to that of the arbitrary magnetic sources producing the observed data. Based on this theoretical property, we propose...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2997991
... of the zero crossings in magnetic fields and their use in interpretation. We first derive analytic expressions for the zero contour lines of the fields produced by dipoles, and show that they are conic curves formed by the intersection of a characteristic cone with the observation plane. We define these zero...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2996720
... , Expanded Abstracts , 364 – 367 , 10.1190/1.1817254 . Wang , P. , S. Bose , B. K. Sinha , and M. Blyth , 2016 , Dipole shear anisotropy using logging-while-drilling sonic tools : SPWLA 57th Annual Logging Symposium, Society of Petrophysicists and Well-Log Analysts...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2991664
... school tilted transmitter seg international exposition loop correspond transmitter reservoir characterization electric dipole current flow horizontal loop dipole Cheesman , S. , R. Edwards , and A. Chave , 1987 , On the theory of sea-floor conductivity mapping using...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5835894
... was established, that is WFEM method. dipole formula instrument coefficient frequency upstream oil & gas field source resistivity wide field apparent resistivity wfem method characteristic current resource penetration depth apparent resistivity electromagnetic response function wide field...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0619
... anderson sensitivity modeling chargeability node configuration inversion consideration survey design dipole true model reconstruction accuracy seg denver 2014 Considerations for survey design based on an advanced distributed IP data acquisition system Perry Eaton*, David Wynn, and John...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-1695
... Summary Since the early 90's, SJ Geophysics has been continually developing and experimenting with unconventional IP array designs. Current customized arrays utilize cross-line dipoles to improve the azimuthal distribution of the data. A key aspect of any IP survey, the selected array design...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0288
... the impacts, a simulation of a RIM system was created in Matlab®. Representing the transmitter as a harmonic electric dipole, the simulation was set up to allow calculations of the amplitude and phase of the radiation at any point in a homogeneous whole space. This basic model allows an investigation of how...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0138
... localized in the vicinity of the primary source. More specifically the study proves that the fields outside the casing are due to a distribution of vertical dipoles that decay in strength away from the primary source. For the TM mode the secondary sources represent an electrical current channeled along...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0791
... technology dipole land hydrocarbon exploration interpretation seg houston 2013 conductivity good reservoir property upstream oil & gas reservoir property Land Hydrocarbon Exploration Using Novel Time-Domain Electromagnetic Technology: A Large-Scale Field Study in Eastern Siberia Michael...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-1030
... Summary: Finite aperture multipole sources are at the root of many borehole acoustic applications (E.g., slowness analysis, fracture/stress orientation from cross-dipole measurements, imaging away from the wellbore, etc.). This finite size and mutual interaction of constituent sources...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-1019
... with respect to the target depth. A time-domain EM system with vertical transmitters and receivers can be an alternative because vertical electric fields are sensitive to deep resistive layers. In this paper, we have written a time-domain forward modeling code, with multiple source and receiver dipoles...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-1130
... dipole. When applied to multiple sources or non-dipolar geometries the observation string should be post-analysed as a series of smaller observation strings. Then, the estimated directions to source pass through the source body or bodies. Gradient tensor analyses, such as those presented here...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-1244
... (FDTD) simulation for forward calculation to minimize the calculation time cost. Using data from a synthetic SMS, we demonstrate that conductive anomalies around SMS could be estimated. We discussed the resolution of our CSEM inversion method, considering the orientation of the dipole of a transmitter...
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