scholarly journals Quantitative regularity analysis of offset-vector sampling for seismic acquisition geometry

2012 ◽  
Vol 2012 (1) ◽  
pp. 1-4
Author(s):  
Wei Wei ◽  
Li-Yun Fu
Geophysics ◽  
2012 ◽  
Vol 77 (2) ◽  
pp. P11-P21 ◽  
Author(s):  
Wei Wei ◽  
Li-yun Fu ◽  
Gerrit Blacquière

A method for the efficient computation of multifrequency focal beams for 3D seismic acquisition geometry analysis has been developed. By computing them for all the frequency components of seismic data, single-frequency focal beams can be extended to multifrequency focal beams. However, this straightforward method involves considerable computer time and memory requirements, especially in complex media settings. Therefore, we propose a rapid 3D multifrequency focal beam method in which only a few single-frequency focal beam computations are followed by a number of smart interpolations. The 3D wavefield extrapolation in the focal beam analysis is conducted by the combined applications of a 3D degenerate Fourier migrator and a 3D Born-Kirchhoff interpolation operator, a process that reduces the computational cost for complex media. The multifrequency focal beam analysis is applied to a 3D model from an oil field of China, demonstrating how spatial sampling differences affect seismic imaging.


2018 ◽  
Author(s):  
Yong Jie ◽  
Luo Kun ◽  
Ge Li ◽  
Jingyi Li ◽  
Peng Bin

Author(s):  
Flemming G. Christiansen ◽  
Jørgen A. Bojesen-Koefoed ◽  
James A. Chalmers ◽  
Finn Dalhoff ◽  
Anders Mathiesen ◽  
...  

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Christiansen, F. G., Bojesen-Koefoed, J. A., Chalmers, J. A., Dalhoff, F., Mathiesen, A., Sønderholm, M., Dam, G., Gregersen, U., Marcussen, C., Nøhr-Hansen, H., Piasecki, S., Preuss, T., Pulvertaft, T. C. R., Audun Rasmussen, J., & Sheldon, E. (2001). Petroleum geological activities in West Greenland in 2000. Geology of Greenland Survey Bulletin, 189, 24-33. https://doi.org/10.34194/ggub.v189.5150 _______________ The summer of 2000 was exciting for everyone interested in the petroleum geology and exploration of West Greenland. The first offshore well in more than 20 years was drilled by the Statoil group in the Fylla licence area, and seismic acquisition activity offshore West Greenland was more intense than previous years with four new surveys being carried out (Fig. 1). Expectations were high when drilling of the Qulleq-1 well was initiated in July 2000, not only with the licensees and the authorities, but also with the public. The well was classified as highly confidential, but nevertheless all information available was closely followed by the press, especially in Greenland and Denmark, but also internationally (see Ghexis 2000). Disappointment was equally high when the press release in September 2000 reported that the well was dry. Since that time much technical work has been carried out by Statoil and its consultants (Pegrum et al. 2001) and by the Geological Survey of Denmark and Greenland (GEUS), and a more balanced view of the positive and negative surprises from the well can now be presented.


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