Geophysical Prospecting

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A SIMULATED ANNEALING APPROACH TO SEISMIC MODEL OPTIMIZATION WITH SPARSE PRIOR INFORMATION1
Geophysical Prospecting - Tập 39 Số 5 - Trang 599-611 - 1991
Klaus Mosegaard, Peter D. Vestergaard
AbstractIt is well known that seismic inversion based on local model optimization methods, such as iterative use of linear optimization, may fail when prior information is sparse. Where the seismic events corresponding to reflectors of interest remain to be identified, a global optimization technique is required.We investigate the use of a global, stochastic optimization method, that of simulated ... hiện toàn bộ
Rapid inversion of data from 2D resistivity surveys with electrode displacements
Geophysical Prospecting - Tập 66 Số 3 - Trang 579-594 - 2018
M.H. Loke, Paul Wilkinson, Jonathan Chambers, Philip Meldrum
ABSTRACTResistivity monitoring surveys are used to detect temporal changes in the subsurface using repeated measurements over the same site. The positions of the electrodes are typically measured at the start of the survey program and possibly at occasional later times. In areas with unstable ground, such as landslide‐prone slopes, the positions of the electrodes can be displaced by ground movemen... hiện toàn bộ
CONTAMINATION INDICATIONS DERIVED FROM ELECTRICAL PROPERTIES IN THE LOW FREQUENCY RANGE1
Geophysical Prospecting - Tập 41 Số 1 - Trang 83-98 - 1993
F. Börner, M. Gruhne, Jürgen H. Schön
AbstractElectrical measurements are an important and integrated component of geophysical investigations connected with environmental problems. As a result of an analysis of the electrical conductivity, basic experiments on sandstones at frequencies below 10 kHz show that the complex behaviour of conductivity is caused exclusively by a complex interface conductivity. Its value is determined mainly ... hiện toàn bộ
MAPPING OIL‐CONTAMINATED SAND AND TILL WITH THE SPECTRAL INDUCED POLARIZATION (SIP) METHOD
Geophysical Prospecting - Tập 45 Số 2 - Trang 303-326 - 1997
H. Vanhala
END CORRECTIONS IN POTENTIAL FIELD MODELING*
Geophysical Prospecting - Tập 27 Số 4 - Trang 749-760 - 1979
Roy Rasmussen, Laust B. Pedersen
AbstractA general treatment of end corrections in gravity and magnetic modeling is presented. The well‐known 2‐D formulae of Talwani and Talwani and Heirtzler become slightly changed to represent a 2 1/2–D body, i.e. a body of polygonal cross section with the tails In the strike direction cut off.
Specific surface area and pore‐size distribution in clays and shales
Geophysical Prospecting - Tập 61 Số 2 - Trang 341-362 - 2013
Utpalendu Kuila, Manika Prasad
ABSTRACTOne of the biggest challenges in estimating the elastic, transport and storage properties of shales has been a lack of understanding of their complete pore structure. The shale matrix is predominantly composed of micropores (pores less than 2 nm diameter) and mesopores (pores with 2–50 nm diameter). These small pores in the shale matrix are mainly associated with clay minerals and organic ... hiện toàn bộ
First‐arrival traveltime tomography with modified total‐variation regularization
Geophysical Prospecting - Tập 65 Số 5 - Trang 1138-1154 - 2017
Wenbin Jiang, Jie Zhang
ABSTRACTFirst‐arrival traveltime tomography is a robust tool for near‐surface velocity estimation. A common approach to stabilizing the ill‐posed inverse problem is to apply Tikhonov regularization to the inversion. However, the Tikhonov regularization method recovers smooth local structures while blurring the sharp features in the model solution. We present a first‐arrival traveltime tomography m... hiện toàn bộ
From the Hagedoorn imaging technique to Kirchhoff migration and inversion
Geophysical Prospecting - Tập 49 Số 6 - Trang 629-643 - 2001
Norman Bleistein, Samuel H. Gray
The seminal 1954 paper by J.G. Hagedoorn introduced a heuristic for seismic reflector imaging. That heuristic was a construction technique – a ‘string construction’ or ‘ruler and compass’ method – for finding reflectors as an envelope of equal traveltime curves defined by events on a seismic trace. Later, Kirchhoff migration was developed. This method is based on an integral representation of the ... hiện toàn bộ
A hybrid absorbing boundary condition for elastic staggered‐grid modelling
Geophysical Prospecting - Tập 60 Số 6 - Trang 1114-1132 - 2012
Yang Liu, Mrinal K. Sen
ABSTRACTWe recently proposed an efficient hybrid scheme to absorb boundary reflections for acoustic wave modelling that could attain nearly perfect absorptions. This scheme uses weighted averaging of wavefields in a transition area, between the inner area and the model boundaries. In this paper we report on the extension of this scheme to 2D elastic wave modelling with displacement‐stress formulat... hiện toàn bộ
Seismic wave extrapolation using lowrank symbol approximation
Geophysical Prospecting - Tập 61 Số 3 - Trang 526-536 - 2013
Sergey Fomel, Lexing Ying, Xiaolei Song
ABSTRACTWe consider the problem of constructing a wave extrapolation operator in a variable and possibly anisotropic medium. Our construction involves Fourier transforms in space combined with the help of a lowrank approximation of the space‐wavenumber wave‐propagator matrix. A lowrank approximation implies selecting a small set of representative spatial locations and a small set of representative... hiện toàn bộ
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