Abstract：The Ordovician carbonate reservoir in Tahe oilfield, Tarim basin, is buried very deep with a depth being larger than 5000 m. The reservoir is featured by fracture-vuggies, and the formation has extremely strong heterogeneity in both the vertical and horizontal direction.These features lead to low signal-to-noise ratio and low resolution of the seismic reflection data, and in turn to the difficulty in characterization of carbonate reservoirs.Aiming at these problems, here we use a stabilized inverse-Q filter to process the three-dimensional (3D) seismic data in Tahe oilfield, conducting seismic amplitude compensation and waveform phase correction, simultaneously.Comparing the inverse-Q filtered result directly with the raw seismic data in terms of seismic profiling, interior information within the reservoir, characterization of faults and fracture-vuggies, we demonstrate the advantages of stabilized inverse-Q filtering in enhancing seismic resolution, strengthening weak signals, and improving lateral continunity of reflections, and reveal that this method can improve the accuracy of fracture-vuggy characterization in the Ordovician carbonate reservoirs.
Bai M, Chen X H, Wu J, et al. 2016. Q-compensated migration by Gaussian beam summation method. Journal of Geophysics and Engineering, 13(1):35-48. Bano M. 1996. Q-phase compensation of seismic records in the frequency domain. Bulletin of the Seismological Society of America, 86(4):1179-1186. Chen Z B, Chen X H, Wang Y H, et al. 2014. Estimation of Q factors from reflection seismic data for a band-limited and stabilized inverse Q filter driven by an average-Q model. Journal of Applied Geophysics, 101:86-94. Futterman W I. 1962. Dispersive body waves. Journal of Geophysical Research, 67(13):5279-5291. Gan Q Q, Xu D, Tang J M, et al. 2009. Seismic resolution enhancement for tight-sand gas reservoir characterization. Journal of Geophysics and Engineering, 6(1):21-28. Hale D. 1981. An inverse-Q filter. Standford Exploration Project Report, 26:231-243. Hargreaves D, Calvert A J. 1991. Inverse Q filtering by Fourier transform. Geophysics, 56(4):519-527. Kjartansson E. 1979. Constant Q wave propagation and attenuation. Journal of Geophysical Research:Solid Earth, 84(B9):4737-4748. Kolsky H. 1953. Stress Waves in Solids. Oxford:Clarendon Press. Kolsky H. 1956. The propagation of stress pulses in viscoelastic solids. Philosophical Magazine, 1(8):693-710. Robinson J C. 1979. A technique for the continuous representation of dispersion in seismic data. Geophysics, 44(8):1345-1351. Wang Y H. 2002. A stable and efficient approach of inverse Q filtering. Geophysics, 67(2):657-663. Wang Y H. 2003. Quantifying the effectiveness of stabilized inverse Q filtering. Geophysics, 68(1):337-345. Wang Y H.2004. Q analysis on reflection seismic data. Geophysical Research Letters, 31(17):L17606. Wang Y H, Guo J. 2004a. Modified Kolsky model for seismic attenuation and dispersion. Journal of Geophysics and Engineering, 1(1):187-196. Wang Y H, Guo J. 2004b. Seismic migration with inverse Q filtering. Geophysical Research Letters, 31(21):L21608. Wang Y H. 2006. Inverse Q-filter for seismic resolution enhancement. Geophysics, 71(3):V51-V60. Wang Y. 2008a. Seismic Inverse Q filtering. Oxford:Blaclwell. Wang Y H. 2008b. Inverse-Q filtered migration. Geophysics, 73(1):S1-S6. Zhang G L, Wang X M, He Z H, et al. 2014. Impact of Q value and gain-limit to the resolution of inverse Q filtering. Journal of Geophysics and Engineering, 11(4):045011. Zhang G L, Wang X M, He Z H.2015. A stable and self-adaptive approach for inverse Q-filter. Journal of Applied Geophysics, 116:236-246. Zhang G L, He Z H, Wang X M, et al.2014. Seismic wave dispersion effects and inverse Q-filter phase compensation. Chinese Journal of Geophysics (in Chinese), 57(5):1655-1663, doi:10.6038/cjg20140528. Zhang G L, Lin J, Wang X M, et al. 2015. A self-adaptive approach for inverse Q-filtering. Chinese Journal of Geophysics (in Chinese),58(7):2525-2535, doi:10.6038/cjg20150727. 甘其刚, 许多, 王仰华. 2012. 利用稳定反 Q滤波技术提高储层预测精度-以川西新场气田上三叠统须家河组气藏为例. 天然气工业, 32(3):42-44. 郭建, 王成彬, 胡中平等. 2007. Q补偿技术在提高地震分辨率中的应用-以准噶尔盆地Y1井区为例. 石油物探, 46(5):509-513, 530. 张固澜, 贺振华, 王熙明等. 2014. 地震波频散效应与反 Q滤波相位补偿. 地球物理学报, 57(5):1655-1663, 125,doi:10.6038/cjg20140528. 张固澜, 林进, 王熙明等. 2015. 一种自适应增益限的反 Q滤波. 地球物理学报, 58(7):2525-2535, doi:10.6038/cjg20150727.
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