Seyyed Ali Fa’al Rastegar1, Abdolrahim Javaherian1,2, Naser Keshavarz Farajkhah3, Mehrdad Soleimani Monfared4, Abbas Zarei5
1. Department of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran
2. Formerly Institute of Geophysics, University of Tehran, Tehran, Iran
3. Research Institute of Petroleum Industry, Tehran, Iran
4. Department of Mining, Petroleum and Geophysics, University of Shahrood, Shahrood, Iran
5. Department of Geophysics, Exploration Directorate of National Iranian Oil Company
Ground-roll attenuation using modified common-offset–common-reflection-surface stacking
Seyyed Ali Fa’al Rastegar1, Abdolrahim Javaherian1,2, Naser Keshavarz Farajkhah3, Mehrdad Soleimani Monfared4, Abbas Zarei5
1. Department of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran
2. Formerly Institute of Geophysics, University of Tehran, Tehran, Iran
3. Research Institute of Petroleum Industry, Tehran, Iran
4. Department of Mining, Petroleum and Geophysics, University of Shahrood, Shahrood, Iran
5. Department of Geophysics, Exploration Directorate of National Iranian Oil Company
Abstract：
We modified the common-offset–common-reflection-surface (COCRS) method to attenuate ground roll, the coherent noise typically generated by a low-velocity, low-frequency, and high-amplitude Rayleigh wave. The COCRS operator is based on hyperbolas, thus it fits events with hyperbolic traveltimes such as reflection events in prestack data. Conversely, ground roll is linear in the common-midpoint (CMP) and common-shot gathers and can be distinguished and attenuated by the COCRS operator. Thus, we search for the dip and curvature of the reflections in the common-shot gathers prior to the common-offset section. Because it is desirable to minimize the damage to the reflection amplitudes, we only stack the multicoverage data in the ground-roll areas. Searching the CS gathers before the CO section is another modification of the conventional COCRS stacking. We tested the proposed method using synthetic and real data sets from western Iran. The results of the ground-roll attenuation with the proposed method were compared with results of the f–k filtering and conventional COCRS stacking after f–k filtering. The results show that the proposed method attenuates the aliased and nonaliased ground roll better than the f–k filtering and conventional CRS stacking. However, the computation time was higher than other common methods such as f–k filtering.
Bergler, S., 2001, The Common reflection surface stack for common offset: theory and application, PhD thesis, University of Karlsruhe, Karlsruhe.
[2]
Bolte, J. F. B., 2004, The common focal point and common reflection surface methodologies: subsets or complements: Geophysical Prospecting, 52, 523−534.
[3]
Boustani, B., Torabi, S., Javaherian, A., and Mortazavi., S. A., 2013, Ground roll attenuation using a curvelet-SVD filter: a case study from the west of Iran: Journal of Geophysics and Engineering, 10, 055006, 1−10.
[4]
Deighan, A. J., and Watts, D. R., 1997, Ground-roll suppression using the wavelet transform: Geophysics, 62, 1896−1903.
[5]
Fenggui, S., Shuling, S., Zhenchun, L., Xiaodong, S., Fang, L., and Dong, L., 2009, Successful application of optimized aperture based CRS stack in the Shengli exploration area: Applied Geophysics, 6(4), 377−383.
[6]
Garabito, G., Oliva, P. C., and Cruz, J. C. R., 2011, Numerical analysis of the finite-offset common reflection traveltime approximations: Journal of Applied Geophysics, 74, 89−99.
[7]
Hamidi, R., Javaherian, A., and Reza, A. M., 2013, Eigenimage wavelet transform for ground roll attenuation; a case study on an Iranian oilfield: Journal of Seismic Exploration, 22(1), 251-270.
Hosseini, S. A., Javaherian, A., Hassani, H., Torabi, S., and Sadri, M., 2015, Adaptive attenuation of aliased ground roll using the shear let transform: Journal of Applied Geophysics, 112, 190-205.
[10]
Li, D., Li, Z., Sun, X., Qin, N., and Zhou, X., 2010, Prestack seismic data enhancement with the common-offset common reflection surface (CO CRS) stack: 3rd International Conference on Biomedical Engineering and Informatics, Yantai, China, 3065−3069.
[11]
Liu, X., 1999, Ground roll suppression using the Karhunen-Loeve transform: Geophysics, 64, 564-6.
[12]
Mann, J., and Höcht, G., 2003, Pulse stretch effects in the context of data-driven imaging methods: 65th conference and technical exhibition, EAGE, Extended abstracts, Norway, 1−4.
[13]
Muller, T., 1999, The common reflection surface stack method - seismic imaging without explicit knowledge of the velocity model, PhD thesis, University of Karlsruhe, Karlsruhe.
[14]
Spinner, M., Tomas, C., Marchetti, P., Gallo, C., and Arfeen, S., 2012, Common offset CRS for advanced imaging in complex geological settings: 82nd Annual Meeting, SEG Expanded Abstracts, Las Vegas, Doi: org/10.1190/segam 2012−1099.1.
[15]
von Steht, M., 2006, 2D CO CRS imaging for multicomponent data recorded by the VSP geometry: SEG Annual Meeting, New Orleans, 3482−3486.
[16]
Yilmaz, O., 2001, Seismic data analysis: processing, inversion and interpretation of seismic data, SEG, Tulsa.
2016, Vol. 13 
