公开(公告)号：EP1301807B1

公开(公告)日：2009-07-22

申请号：EP01932427.6

申请日：2001-05-22

申请人： Norsar

发明人： VINJE, Vetle

IPC分类号： G01V1/28 ,  G01V1/36

CPC分类号： G01V1/282 ,  G01V2200/14 ,  G01V2210/614

摘要： Method for solving the classical inversion problem of finding the angle dependent reflection coefficients along selected reflectors in the subsurface. The input data to the method include seismic constant offset or constant angle data cubes from Pre-Stack Depth Migration of Kirchhoff type and the corresponding reflectors and velocities from the interpretation and velocity analysis of the data. One or more of the reflectors are chosen and ray modeling is done to create synthetic seismics for all shot/receiver pairs in the seismic survey. Based on these modeling results, amplitude correction maps are made for the various reflection angles. These correction maps are applied to the amplitudes from the seismic data. The corrected amplitudes are approximations to the angle-dependent reflection coefficients in all points on each selected reflector. For each point, a weight function is computed, giving the quantitative resolution of the estimate of the reflection coefficient.

公开(公告)号：EP1611461B1

公开(公告)日：2013-05-29

申请号：EP04726039.3

申请日：2004-04-06

申请人： Norsar

发明人： LECOMTE, Isabelle

IPC分类号： G01V1/28

CPC分类号： G01V1/286 ,  G01V1/282 ,  G01V2210/512 ,  G01V2210/614

公开(公告)号：EP2616307A1

公开(公告)日：2013-07-24

申请号：EP11770189.6

申请日：2011-09-16

申请人： Stiftelsen, Norsar

发明人： LINGVALL, Fredrik ,  DANIELSEN, Tron

IPC分类号： B61L29/28

CPC分类号： B61L29/284 ,  B61L29/28

摘要： A train detection security system and method comprising sensor units (2a, 2b,....) arranged for being fixed to at least one rail (10a, 10b). The sensor units (2a, 2b,....) are arranged for detecting a first signal (s1) induced by a moving train (6). Each sensor unit (2a, 2b....) is divided in at least a first chamber (21) and a second chamber (22), where said first and second chambers (21, 22) are separated by an electromagnetic shield (23). The first chamber (21) comprises a piezoelectric element (24) fixed to an outer wall (25) of said first chamber (21), and an amplifier (26). A warning signal is generated in a control system based on the approaching train.

公开(公告)号：EP1611461A1

公开(公告)日：2006-01-04

申请号：EP04726039.3

申请日：2004-04-06

申请人： Norsar

发明人： LECOMTE, Isabelle

IPC分类号： G01V1/28

CPC分类号： G01V1/286 ,  G01V1/282 ,  G01V2210/512 ,  G01V2210/614

摘要： Method simulating local prestack depth seismic migrated images from target models, without using either real or synthetic recorded data. The input is a background model and some surveys, with the possibility of defining some acquisition surfaces to describe any acquisition geometry of potential surveys. In addition, detailed target models are given, generated from different type of input, such as parameter grids, interpreted time- or depth- horizons with attributes, reservoir models, and other models .In the most efficient application of the invention, a point in the background model is chosen by the user and will act as a node for Green's functions calculation between the surveys/acquisition surfaces and that point. Green's functions can be calculated in many ways (classic ray tracing, Wavefront Construction, and Eikonal solvers are possible methods), the mandatory information being slowness vectors to form a sum vector called the scattering wavenumber. According to some survey choices, the scattering wavenumbers are extracted, with various sub-selections, sorting, re-ordering, and used to create filters in the scattering wavenumber domain. Amplitudes, pulses, scattering pattern, Fresnel-zone effects, and other effects can be included in the filters. The latter are then applied to each target model to give a simulated prestack local image in depth after some transformation, like Fast Fourier Transform, from the wavenumber domain to the space domain. For better accuracy, local images for neighboring Green's functions nodes can be merged to form a classic prestack depth migrated section. A variant of the present invention is to simulate seismic traces in the time domain. The inner core of the invention, with application of scattering wavenumbers to build filters to apply to target models, can be applied in other domains, such as Ground Penetrating Radar, and possibly acoustical and medical imaging.

公开(公告)号：EP1301807A1

公开(公告)日：2003-04-16

申请号：EP01932427.6

申请日：2001-05-22

申请人： Norsar

发明人： VINJE, Vetle

IPC分类号： G01V1/28 ,  G01V1/36

CPC分类号： G01V1/282 ,  G01V2200/14 ,  G01V2210/614

摘要： Method for solving the classical inversion problem of finding the angle dependent reflection coefficients along selected reflectors in the subsurface. The input data to the method include seismic constant offset or constant angle data cubes from Pre-Stack Depth Migration of Kirchhoff type and the corresponding reflectors and velocities from the interpretation and velocity analysis of the data. One or more of the reflectors are chosen and ray modeling is done to create synthetic seismics for all shot/receiver pairs in the seismic survey. Based on these modeling results, amplitude correction maps are made for the various reflection angles. These correction maps are applied to the amplitudes from the seismic data. The corrected amplitudes are approximations to the angle-dependent reflection coefficients in all points on each selected reflector. For each point, a weight function is computed, giving the quantitative resolution of the estimate of the reflection coefficient.