scholarly journals Depth estimation of potential field by using a new downward continuation based on the continued fraction in space domain

2021 ◽  
Author(s):  
Wenna Zhou ◽  
Chong Zhang ◽  
Dailei Zhang
Keyword(s):  
Potential Field ◽  
Continued Fraction ◽  
Depth Estimation ◽  
Downward Continuation ◽  
Space Domain

scholarly journals Depth Estimation of Potential Field Sources by Using Improved Chebyshev‐Padé Downward Continuation in Wave Number Domain

2020 ◽  
Vol 7 (10) ◽  
Author(s):  
Yuan Yuan ◽  
Wenna Zhou ◽  
Xiangyu Zhang ◽  
Guochao Wu ◽  
Shuiliang Tang ◽  
...  
Keyword(s):  
Potential Field ◽  
Depth Estimation ◽  
Downward Continuation ◽  
Wave Number

scholarly journals Gravity Field Imaging by Continued Fraction Downward Continuation: A Case Study of the Nechako Basin (Canada)

2021 ◽  
Vol 95 (S1) ◽  
pp. 102-105
Author(s):  
Chong ZHANG ◽  
Wenna ZHOU ◽  
Qingtian LV ◽  
Jiayong YAN
Keyword(s):  
Gravity Field ◽  
Continued Fraction ◽  
Downward Continuation ◽  
Field Imaging

A stable iterative downward continuation of potential field data

2013 ◽  
Vol 98 ◽  
pp. 205-211 ◽  
Author(s):  
Guoqing Ma ◽  
Cai Liu ◽  
Danian Huang ◽  
Lili Li
Keyword(s):  
Potential Field ◽  
Field Data ◽  
Downward Continuation ◽  
Potential Field Data

Migration with arbitrarily wide-angle wave equations

Geophysics ◽  
2005 ◽  
Vol 70 (3) ◽  
pp. S61-S70 ◽  
Author(s):  
Murthy N. Guddati ◽  
A. Homayoun Heidari
Keyword(s):  
Impulse Response ◽  
Wave Equations ◽  
Heterogeneous Media ◽  
Computational Effort ◽  
Downward Continuation ◽  
Wide Angle ◽  
Auxiliary Variables ◽  
Space Domain ◽  
Marching Scheme ◽  
Migration Technique

We develop a new scalar migration technique that is highly accurate for imaging steep dips in heterogeneous media. This method is based on arbitrarily wide-angle wave equations (AWWEs) that are highly accurate space-domain one-way wave equations and have a form similar to the 15° equation. The accuracy of the proposed method is increased by introducing auxiliary variables, as well as adjusting the parameters of the approximation. Poststack migration is carried out by downward continuation using the AWWE, for which we have developed a stable, explicit, double-marching scheme. Up to 80° accuracy is achieved by second-order AWWE migration with only 2.3 times the computational effort of the 15° equation and requiring almost the same storage. We illustrate the performance of AWWE migration using impulse-response graphs, a single-dipping reflector, and a slice of the SEG/EAGE salt model.

On: F. Bryan Davies’ discussion of “Airborne gravity is here,” by S. Hammer, and related discussions with replies by S. Hammer (GEOPHYSICS, 51, 1502–1503, July 1986).

Geophysics ◽  
1987 ◽  
Vol 52 (3) ◽  
pp. 376-376
Author(s):  
Nelson C. Steenland
Keyword(s):  
Potential Field ◽  
Complete Loss ◽  
Airborne Gravity ◽  
Space Domain

Attenuation of potential field anomalies with increasing distance from the source is, of course, independent of sampling, so the Nyquist problem may always be avoided with increased cost, as Davies pointed out. However, attenuation does produce a complete loss of some signal with increasing distance because instruments operate in a discrete or space domain. So all instruments are filters in this sense, and no amount of sampling overcomes this unfortunate characteristic.

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