Multi-Azimuth, Coil Shooting And Dual Sensor Streamer Acquisition: Step Change Seismic Imaging Results In Deep Water Indonesia

2011 ◽  
Author(s):  
Michele Buia ◽  
Emanuele Tozzi ◽  
Alessia Ravasio ◽  
Peter Brown
Keyword(s):  
Deep Water ◽  
Seismic Imaging ◽  
Step Change ◽  
Imaging Results ◽  
Dual Sensor

Seismic imaging and velocity analysis for an Alberta Foothills seismic survey

Geophysics ◽  
2001 ◽  
Vol 66 (3) ◽  
pp. 721-732 ◽  
Author(s):  
Lanlan Yan ◽  
Larry R. Lines
Keyword(s):  
Seismic Imaging ◽  
Migration Velocity ◽  
Surface Velocity ◽  
Seismic Survey ◽  
Velocity Analysis ◽  
Prestack Depth Migration ◽  
Near Surface ◽  
Depth Migration ◽  
Migration Velocity Analysis ◽  
Imaging Results

Seismic imaging of complex structures from the western Canadian Foothills can be achieved by applying the closely coupled processes of velocity analysis and depth migration. For the purposes of defining these structures in the Shaw Basing area of western Alberta, we performed a series of tests on both synthetic and real data to find optimum imaging procedures for handling large topographic relief, near‐surface velocity variations, and the complex structural geology of steeply dipping formations. To better understand the seismic processing problems, we constructed a typical foothills geological model that included thrust faults and duplex structures, computed the model responses, and then compared the performance of different migration algorithms, including the explicit finite difference (f-x) and Kirchhoff integral methods. When the correct velocity was used in the migration tests, the f-x method was the most effective in migration from topography. In cases where the velocity model was not assumed known, we determined a macrovelocity model by performing migration/velocity analysis by using smiles and frowns in common image gathers and by using depth‐focusing analysis. In applying depth imaging to the seismic survey from the Shaw Basing area, we found that imaging problems were caused partly by near‐surface velocity problems, which were not anticipated in the modeling study. Several comparisons of different migration approaches for these data indicated that prestack depth migration from topography provided the best imaging results when near‐surface velocity information was incorporated. Through iterative and interpretive migration/velocity analysis, we built a macrovelocity model for the final prestack depth migration.

Step Change in 3D Two-Component OBC Seismic Imaging in the Arabian Gulf

2007 ◽  
Author(s):  
J.M. Reilly ◽  
A. Shatilo ◽  
M. Rainwater ◽  
H. Bu Al-Rougha
Keyword(s):  
Seismic Imaging ◽  
Arabian Gulf ◽  
Step Change ◽  
Two Component

scholarly journals Vortex scattering by step topography

2007 ◽  
Vol 571 ◽  
pp. 495-505 ◽  
Author(s):  
A. K. HINDS ◽  
E. R. JOHNSON ◽  
N. R. MCDONALD
Keyword(s):  
Shallow Water ◽  
Deep Water ◽  
Vortex Pair ◽  
Step Change ◽  
Angle Of Incidence ◽  
Numerical Computations ◽  
Large Depth ◽  
Constants Of Motion

The scattering at a rectilinear step change in depth of a shallow-water vortex pair consisting of two patches of equal but opposite-signed vorticity is studied. Using the constants of motion, an explicit relationship is derived relating the angle of incidence to the refracted angle after crossing. A pair colliding with a step from deep water crosses the escarpment and subsequently propagates in shallow water refracted towards the normal to the escarpment. A pair colliding with a step from shallow water either crosses and propagates in deep water refracted away from the normal or, does not cross the step and is instead totally internally reflected by the escarpment. For large depth changes, numerical computations show that the coherence of the vortex pair is lost on encountering the escarpment.

First seismic imaging results of tectonically complex structures at shallow depths beneath the northwest Canterbury Plains, New Zealand

2010 ◽  
Vol 70 (4) ◽  
pp. 317-331 ◽  
Author(s):  
C. Dorn ◽  
S. Carpentier ◽  
A.E. Kaiser ◽  
A.G. Green ◽  
H. Horstmeyer ◽  
...  
Keyword(s):  
New Zealand ◽  
Seismic Imaging ◽  
Complex Structures ◽  
Imaging Results

Crosswell Seismic: Step Change in Seismic Imaging - A Case Study from Indonesia

2011 ◽  
Author(s):  
Tri Handayani ◽  
Zeppy Irwanzah ◽  
Muhammad Taslim ◽  
Dede Kurniadi ◽  
Sanjeev Dogra ◽  
...  
Keyword(s):  
Seismic Imaging ◽  
Step Change

scholarly journals 3D reflection seismic imaging of the iron-oxide deposits in the Ludvika mining area (Sweden) using a focusing pre-stack depth migration approach

2021 ◽  
Author(s):  
Felix Hloušek ◽  
Michal Malinowski ◽  
Lena Bräunig ◽  
Stefan Buske ◽  
Alireza Malehmir ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Seismic Imaging ◽  
Mine Planning ◽  
Seismic Exploration ◽  
Depth Imaging ◽  
Mining Site ◽  
Depth Migration ◽  
Reflection Seismic ◽  
Imaging Results

Abstract. We present the pre-stack depth imaging results for a case study of 3D reflection seismic exploration at the Blötberget iron-oxide mining site belonging to the Bergslagen mineral district in central Sweden. The goal of this case study is to directly image the ore-bearing units and to map its possible extension down to greater depths than known from existing boreholes. Therefore, we applied a tailored pre-processing workflow as well as two different seismic imaging approaches, Kirchhoff pre-stack depth migration and Fresnel Volume Migration (FVM). Both imaging techniques deliver a well resolved 3D image of the deposit and its host rock, where the FVM image yields a significantly better image quality compared to the KPSDM image. We were able to unravel distinct reflection horizons, which are linked to known mineralisation and provide insights on lateral and depth extent of the deposits beyond their known extension from borehole data. A comparison of the known mineralization and the image show a good agreement of the position and the shape of the imaged reflectors caused by the mineralization. Furthermore, the images show a reflector, which is interpreted to be a fault intersecting the mineralisation and which can be linked to the surface geology. The depth imaging results can serve as the basis for further investigations, drillings and follow-up mine planning at the Blötberget mining site.

scholarly journals SIT4ME: seismic imaging of mineral-hosting structures in Sotiel-Coronada (Spain)

2020 ◽  
Author(s):  
Yesenia Martínez ◽  
Juan Alcalde ◽  
David Martí ◽  
Puy Ayarza ◽  
Mario Ruiz ◽  
...  
Keyword(s):  
Seismic Imaging ◽  
Raw Materials ◽  
Imaging Techniques ◽  
Mineral Exploration ◽  
P Wave ◽  
Target Area ◽  
Source Imaging ◽  
The North ◽  
Imaging Results ◽  
East West

<p>In order to tackle the ever-increasing demand of raw materials, the European Institute of Technology (EIT) promotes research and innovation solutions for safe and sustainable mineral exploration through its Raw Materials Programme. The SIT4ME project (“Seismic Imaging Techniques for Mineral Exploration”) has been funded as part of this program to develop efficient techniques in seismic acquisition and imaging methods for mineral exploration in crystalline environments. Within SIT4ME, a multidisciplinary data acquisition experiment (i.e. 3D-3C active and passive source seismic datasets) took place in November 2009 in Sotiel-Coronada (Iberian Pyrite Belt, SW Spain). The aim of this experiment was to image a 300-500 m depth pyrite-rich massive sulfide orebody interbedded with felsic volcanic rocks and shales. The seismic dataset involves the recording of 875 vibration points in 653 seismic receivers, distributed in a 3D mesh around the target and six 2D crooked lines. Conventional processing workflow (such as static corrections, surface-consistent deconvolution, amplitude equalization, frequency filtering, and velocity analysis) was combined with more advance methods (e.g. ground roll attenuation or post-stack coherency filtering) to obtain robust images of the subsurface of the target area. The processing workflow has been applied to four 2D seismic sections, one in the North-South and three in the East-West directions, distributed across the study area. The preliminary imaging results show coherent reflective packages down to two seconds two-way traveltime (TWT). The North-South line contains a north-dipping ~400 m long highly reflective zone in the center at 130 ms TWT. The east-west profiles show a slightly folded structure (antiform and synform) which is evident down to 0.25 s TWT. Towards the north, the seismic lines become parallel to subsurface structures and therefore the track of these structures is lost. Current work involves the incorporation of well-log data to improve the quality and resolution of the interpretations. The next processing steps will involve pre-stack depth migration, P-wave travel-time tomography and a combined analysis of controlled source imaging and ambient noise interferometry data.</p><p>The SIT4ME project has been funded by EIT Raw Materials (17024).</p>

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