Separation of seismic diffraction wave and its influencing factors in complex fault blocks
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摘要:
地震绕射波是地下小尺度不连续构造体（如裂缝、断层、溶洞和地层尖灭等）的地震响应，绕射波的正确识别对复杂断块油气田勘探具有重要意义。平面波预测法通过倾角估计预测连续性较好的反射波同相轴而保留弯曲程度较大的不连续绕射波同相轴，从而分离地震反射和绕射波。在分析绕射波与反射波信号特征差异的基础上，研究了基于平面波预测的绕射波分离方法，分析了噪声和平面波预测滤波器参数对地震绕射波分离结果的影响。模拟数据和实际数据分析结果表明，噪声水平严重影响绕射波分离效果，噪音过大分离结果会不准确；平面波预测滤波器光滑半径偏小会引入噪音和假象，光滑半径偏大会导致绕射波分离不彻底，小断块地震绕射波响应难以分离。
Abstract:The seismic diffraction wave is the seismic responses of subsurface small-scale discontinuous structures, such as fractures, faults, karst caves and pinching-out strata. Correct recognition of diffraction wave is of great significance for exploration of complex fault block oil and gas fields. Based on the characteristics of diffracted and reflected wave signals, a method for separation of diffracted wave is developed in this paper on the basis of plane wave prediction and the analysis of the influences of noise and plane wave prediction filter parameters. The plane wave prediction method can separate seismic reflections and diffraction waves by predicting the event of reflection wave with better continuity and retain the event of discontinuous diffraction wave with greater bending degree through dip estimation. The comparison of simulation data and actual data shows that noise seriously affects the separation of diffracted wave, and the separation result will be inaccurate if the noise is too large; the noise and false image will be introduced if the smooth radius of plane wave prediction filter is too small, and the separation of diffracted wave will not be complete if the smooth radius is too large, and the diffracted wave response of small fault block is difficult to be separated.
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[1] Bansal R, Imhof M G. Diffraction enhancement in prestack seismic data [J]. Geophysics, 2005, 70(3): V73-V79. doi: 10.1190/1.1926577
[2] Khaidukov V, Landa E, Moser T J. Diffraction imaging by focusing-defocusing: An outlook on seismic superresolution [J]. Geophysics, 2004, 69(6): 1478-1490. doi: 10.1190/1.1836821
[3] 刘玉金, 李振春, 黄建平, 等. 绕射波叠前时间偏移速度分析及成像[J]. 地球物理学进展, 2013, 28(6):3022-3029
LIU Yujin, LI Zhenchun, HUANG Jianping, et al. Prestack time migration velocity analysis and imaging of seismic diffractions [J]. Progress in Geophysics, 2013, 28(6): 3022-3029.
[4] Kanasewich E R, Phadke S M. Imaging discontinuities on seismic sections [J]. Geophysics, 1988, 53(3): 334-345. doi: 10.1190/1.1442467
[5] Claerbout J F. Earth Soundings Analysis: Processing Versus Inversion[M]. Cambridge, MA: Blackwell Scientific Publications Inc., 1992.
[6] Fomel S. Applications of plane-wave destruction filters [J]. Geophysics, 2002, 67(6): 1946-1960. doi: 10.1190/1.1527095
[7] Nowak E J, Imhof M G. Diffractor localization via weighted Radon transforms[C]//74th SEG Annual Meeting. Denver, Colorado, USA: SEG, 2004: 2108-2111.
[8] Berkovitch A, Belfer I, Hassin Y, et al. Diffraction imaging by multifocusing [J]. Geophysics, 2009, 74(6): WCA75-WCA81. doi: 10.1190/1.3198210
[9] Koren Z, Ravve I, Levy R. Specular-diffraction imaging by directional angle decomposition[C]//72nd EAGE Conference and Exhibition. Barcelona, Spain: EAGE, 2010.
[10] Klokov A, Baina R, Landa E, et al. Diffraction imaging for fracture detection: synthetic case study[C]//2010 SEG Annual Meeting. Denver, Colorado: SEG, 2010: 3354-3358.
[11] Moser T J, Howard C B. Diffraction imaging in depth [J]. Geophysical Prospecting, 2008, 56(5): 627-641. doi: 10.1111/j.1365-2478.2007.00718.x
[12] Decker L, Klokov A, Fomel S. Comparison of seismic diffraction imaging techniques: plane wave destruction versus apex destruction[C]//2013 SEG Annual Meeting. Houston, Texas: SEG, 2013: 4054-4059.
[13] 赵娟娟, 李德春, 匡伟, 等. F-K滤波方法分离地震绕射波和反射波[J]. 能源技术与理论, 2010(3):16-17
ZHAO Juanjuan, LI Dechun, KUANG Wei, et al. Separation of diffractions and reflections by means of F-K filtering method [J]. Energy Technology and Management, 2010(3): 16-17.
[14] 马永生. VSP中绕射波形态的理论分析[J]. 石油物探, 1991, 30(1):64-71
MA Yongsheng. Theoretical analysis of diffraction wave pattern in VSP [J]. Geophysical Prospecting for Petroleum, 1991, 30(1): 64-71.
[15] 黄建平, 李振春, 孔雪, 等. 基于PWD的绕射波波场分离成像方法综述[J]. 地球物理学进展, 2012, 27(6):2499-2510
HUANG Jianping, LI Zhenchun, KONG Xue, et al. The review of the wave field separation method about reflection and diffraction based on the PWD [J]. Progress in Geophysics, 2012, 27(6): 2499-2510.
[16] 朱生旺, 李佩, 宁俊瑞. 局部倾角滤波和预测反演联合分离绕射波[J]. 地球物理学报, 2013, 56(1):280-288
ZHU Shengwang, LI Pei, NING Junrui. Reflection/diffraction separation with a hybrid method of local dip filter and prediction inversion [J]. Chinese Journal of Geophysics, 2013, 56(1): 280-288.
[17] 蒋波, 赵金玉, 邬达理, 等. 基于反射波层拉平的绕射波分离与成像方法[J]. 石油物探, 2014, 53(2):137-141, 148
JIANG Bo, ZHAO Jinyu, WU Dali, et al. A method for diffraction wave separation and imaging based on horizon-flattening of reflection waves [J]. Geophysical Prospecting for Petroleum, 2014, 53(2): 137-141, 148.
[18] 李正伟, 张剑锋, 刘伟. 基于倾角—偏移距域道集的绕射波成像[J]. 地球物理学报, 2018, 61(4):1447-1459
LI Zhengwei, ZHANG Jianfeng, LIU Wei. Diffraction imaging using dip-angle and offset gathers [J]. Chinese Journal of Geophysics, 2018, 61(4): 1447-1459.
[19] Decker L, Merzlikin D, Fomel S. Diffraction imaging and time-migration velocity analysis using oriented velocity continuation [J]. Geophysics, 2017, 82(2): U25-U35. doi: 10.1190/geo2016-0141.1
[20] Merzlikin D, Fomel S. Analytical path-summation imaging of seismic diffractions [J]. Geophysics, 2017, 82(1): S51-S59. doi: 10.1190/geo2016-0140.1
[21] Decker L, Janson X, Fomel S. Carbonate reservoir characterization using seismic diffraction imaging [J]. Interpretation, 2015, 3(1): SF21-SF30. doi: 10.1190/INT-2014-0081.1
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