Statics correction methods for 3D converted-wave (PS) seismic reflectionShaun Strong 1 2 3 Steve Hearn 1 2
1 Velseis Pty Ltd, Brisbane, Qld 4074, Australia.
2 School of Earth Sciences, University of Queensland, Brisbane, Qld 4072, Australia.
3 Corresponding author. Email: firstname.lastname@example.org
Exploration Geophysics 48(3) 237-245 https://doi.org/10.1071/EG15115
Submitted: 3 November 2015 Accepted: 5 March 2016 Published: 1 April 2016
One of the most difficult steps in the PS processing sequence is estimation of the S-wave receiver statics. This process is particularly important at the coal scale, due to the need for higher frequency content (better resolution).
We present an analysis of three approaches for estimating 3D PS statics. These include a surface-consistent inversion algorithm (analogous to the residual-statics method used in conventional P-wave processing), PPS refraction statics, and a so-called robust statistical method. This analysis is achieved through the use of synthetic models, and a coal-scale 3D-3C survey acquired in the Bowen Basin.
The presented datasets demonstrate that the surface-consistent inversion method can become unstable in certain environments. This is likely due to parameter leakage between receiver and structural terms, caused by the highly asymmetric nature of the shallow PS reflection paths. The robust statistical method appears reliable for determination of short-wavelength receiver statics, and hence is useful for continuity enhancement. The PPS refraction approach can provide both short-wavelength and long-wavelength solutions, provided the PPS arrivals can be picked reliably. As with P-wave analysis, a combination of algorithms may provide the most effective production tool for determination of PS receiver statics.
Key words: 3D, converted wave, PPS refraction, statics.
ReferencesBrzostowski, M., Zhu, X., Altan, S., Thomsen, L., Barkved, O., Rosland, B., and Amoco, B., 1999, 3-D converted-wave processing over the Valhall field: 69th Annual International Meeting, SEG, Expanded Abstracts, 695–698.
Cary, P. W., and Eaton, D. W., 1993, A simple method for resolving large converted-wave (P-SV) statics: Geophysics, 58, 429–433
Cova, R., Henley, D., and Innanen, K., 2015, Addressing shear wave static corrections in the ray parameter domain: a non-stationary interferometric approach: 85th Annual International Meeting, SEG, Expanded Abstracts, 2129–2133.
Guevara, S. E., Margrave, G. F., and Isaac, H., 2015, A method for converted wave receiver statics correction in the CRG domain: 85th Annual International Meeting, SEG, Expanded Abstracts, 2134–2137.
Hearn, S., 2004, Shallow, high-resolution converted-wave seismology for coal exploration: 17th ASEG Geophysical Conference and Exhibition, Extended Abstracts, 1–4.
Hearn, S., and Meulenbroek, A., 2011, Ray-path concepts for converted-wave seismic refraction: Exploration Geophysics, 42, 139–146
| 1:CAS:528:DC%2BC3MXotVelsLk%3D&md5=42a4f75d811c69e17ea9999794455e5eCAS |
Hearn, S., Hendrick, N., and McMonagle, J., 2003, Converted-wave seismic reflection for improved resolution of coal structures: ACARP Report C10020.
Hendrick, N., Hearn, S., and Strong, S., 2007, Integrated P/PS seismic imaging for improved geological characterisation of coal environments: ACARP Report C13029.
Henley, D., 2014, Raypath interferometry vs. conventional statics: recent field data and model comparisons: SEG Technical Program, Expanded Abstracts, 2040-2044.
Lawton, D. C., 1989, Computation of refraction static corrections using first-break traveltime differences: Geophysics, 54, 1289–1296
MacLeod, M., Hanson, R., Hadley, M., Reynolds, K., Lumley, D., McHugo, S., and Probert, A., 1999, The Alba Field OBC seismic survey: 6th International Congress of the Brazilian Geophysical Society, 1–4.
Meulenbroek, A., and Hearn, S., 2011, Analysis of converted refractions for shear statics and near-surface characterisation: Exploration Geophysics, 42, 147–154
| 1:CAS:528:DC%2BC3MXotVelsLY%3D&md5=ed727afd34c6af06ca97755777f54a1dCAS |
Ralston, M., 2015, Estimation of delay time refraction statics by regularized inversion of first arrival times: 85th Annual International Meeting, SEG, Expanded Abstracts, 2332–2336.
Reiter, L., 1970, An investigation into the time term method in refraction seismology: Bulletin of the Seismological Society of America, 60, 1–13
Simin, V., Harrison, M. P., and Lorentz, G. A., 1996, Processing the Blackfoot 3C-3D seismic survey: CREWES Research Report 8(39).
Socco, L. V., Mabyalaht, G., and Comina, C., 2015, Robust static estimation from surface wave data: 85th Annual International Meeting, SEG, Expanded Abstracts, 5222–5227.
Stewart, R. R., Gaiser, J. E., Brown, R. J., and Lawton, D. C., 2002, Converted-wave seismic exploration: methods: Geophysics, 67, 1348–1363
Strong, S., and Hearn, S., 2008, Multi-component seismic-resolution analysis using finite-difference acquisition modelling: Exploration Geophysics, 39, 189–197
Strong, S., and Hearn, S., 2011, Towards 3D, integrated P+PS seismic imaging of coal targets: ACARP Report C17029.
Thomsen, L., 1999, Converted-wave reflection seismology over inhomogeneous, anisotropic media: Geophysics, 64, 678–690
Vargas, J., Monsegny, J., Agudelo, W., and Montes, L., 2011, Comparative analysis of C-wave receiver static estimation in onshore data: 12th International Congress of the Brazilian Geophysical Society, 1–4.
Yang, C., Wang, Y., and Lu, J., 2012, Application of Rayleigh waves on PS-wave static corrections: Journal of Geophysics and Engineering, 9, 90–97
| 1:CAS:528:DC%2BC3sXivFWnsw%3D%3D&md5=88874737c3b4cecc86155f95e1308aa4CAS |