Abstract：Inside the deep metamorphic buried hill in the BZ-A condensate gas field，conventional seismic data based on reflected wave processing has a low signal-to-noise ratio and poor imaging quality. Thus, it is difficult to effectively predict the distribution of inner fractured reservoirs. Scattered wave field information can describe the underground heterogeneous geological bodies，which can well indicate the development of cracks and faults inside a buried hill. In view of this，the paper proposes a pre-stack scattered wave separation method based on mathematical morphological filtering. Through a pre-stack common-offset gather analysis, the difference between the morphological characteristics of the scattered wave and the reflected wave is determined, namely the time-distance relationship difference, and this difference is used to construct linear structural elements. Then, the reflected wave is obtained by morphological filtering in the spatial direction, and the scattered wave is obtained by subtracting the reflected wave from the original wave field. The model test results show that the pre-stack scattered wave separation method based on morphological filtering achieves a relatively complete scattered wave field with high precision and effectively enhances the imaging quality of complex geological bodies. The application of field data shows that the scattered wave imaging results improve the characterization effect of fractured reservoirs inside buried hills and provide technical support for the deployment of well locations in the BZ-A condensate gas field.
徐德奎,何玉,郑江峰.基于绕射波的断层识别方法应用[J].物探与化探,2016,40(4):783-787.XU Dekui,HE Yu,ZHENG Jiangfeng.A method based on diffraction wave for fault identification and its application[J].Geophysical and Geochemical Exploration,2016,40(4):783-787.
[2]
陈明政,邓光校,朱生旺,等.绕射波分离成像技术在塔河油田碳酸盐岩地震弱反射储层预测中的应用[J].石油物探,2015,54(2):234-240.CHEN Mingzheng,DENG Guangjiao,ZHU Shengwang,et al.Application of diffraction wave separation and imaging technique in weak seismic reflection of carbonate reservoir prediction in Tahe Oilfield[J].Geophysical Prospecting for Petroleum,2015,54(2):234-240.
[3]
薛永安,李慧勇.渤海海域深层太古界变质岩潜山大型凝析气田的发现及其地质意义[J].中国海上油气,2018,30(3):1-9.XUE Yongan,LI Huiyong.Large condensate gas field in deep Archean metamorphic buried hill in Bohai sea:discovery and geological significance[J].China Offshore Oil and Gas,2018,30(3):1-9.
[4]
KREY T.The significance of diffraction in the investigation of faults[J].Geophysics,1952,17(4)，843-858.
[5]
ASGEDOM E G,GELIUS L J,AUSTENG A,et al.A new approach to post-stack diffraction separation[C].SEG Technical Program Expanded Abstracts,2011,30:3861-3865.
[6]
罗腾腾,徐基祥,秦臻,等.混合域高分辨率Radon变换及其在绕射波分离与成像中的应用[J].石油物探,2020,59(6):890-900.LUO Tengteng,XU Jixiang,QIN Zhen,et al.Hybrid-domain high-resolution Radon transform and its application in diffraction wave separation and imaging[J].Geophysical Prospecting for Petroleum,2020,59(6):890-900.
[7]
罗腾腾,徐基祥,孙夕平.应用迭代收缩高分辨率Radon变换的绕射波分离与成像方法[J].石油地球物理勘探,2021,56(2):313-322.LUO Tengteng,XU Jixiang,SUN Xiping.Diffraction wave separation and imaging based on high-resolution Radon transform on an iterative model shrinking approach[J].Oil Geophysical Prospecting,2021,56(2):313-322.
[8]
ZHU X S,WU R S.Imaging diffraction points using the local image matrices generated in prestack migration[J].Geophysics,2010,75(1):S1-S9.
[9]
严天凡,刘伊克.角度域裂缝散射波成像及参数反演[C].第四届油气地球物理学术年会论文集,2021，561-564.YAN Tianfan,LIU Yike.Scattered wave imaging and parameter inversion of fractures in angle domain[C].Proceedings of the Fourth Annual Conference on Oil and Gas Geophysics,2021,561-564.
[10]
朱万怡,王华忠,吴成梁,等.基于行波分解的绕射波成像方法研究[J].石油物探,2020,59(2):226-235.ZHU Wanyi,WANG Huazhong,WU Chengliang,et al.Diffraction imaging based on wavefield decomposi-tion[J].Geophysical Prospecting for Petroleum,2020,59(2):226-235.
[11]
张志军,肖广锐,李尧.渤中19-6油田变质岩潜山内幕裂缝地震响应特征及预测技术[J].石油地球物理勘探,2021,56(4):845-852.ZHANG Zhijun,XIAO Guangrui,LI Yao.Seismic response characteristics and prediction of fractured re-servoir inside metamorphic buried hill of Bozhong 19-6 oilfield[J].Oil Geophysical Prospecting,2021,56(4):845-852.
[12]
陈可洋,杨微,吴清岭,等.地震反射波与散射波波场分离方法初探[J].岩性油气藏,2013,25(2):76-81.CHEN Keyang,YANG Wei,WU Qingling,et al.Preliminary study on wave field separation of seismic reflection wave and scattered wave[J].Lithologic Re-servoirs,2013,25(2):76-81.
[13]
LANDA E,SHTIVELMAN V,GELCHINSKY B.A method for detection of diffracted waves on common-offset sections[J].Geophysical Prospecting,1987,35(4):359-373.
[14]
LANDA E,KEYDAR S.Seismic monitoring of diffraction images for detection of local heterogeneities[J].Geophysics,1998,63(3):1093-1100.
[15]
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.
[16]
BANSAL R,IMHOF M G.Diffraction enhancement in prestack seismic data[J].Geophysics,2005,70(3):V73-V79.
[17]
TANER M T,FOMEL S,LANDA E.Separation and imaging of seismic diffractions using plane-wave decomposition[C].SEG Technical Program Expanded Abstracts,2006,25:2401-2405.
[18]
KONG X,WANG D Y,LI Z C,et al.Diffraction separation by plane-wave prediction filtering[J].Applied Geophysics,2017,14(3):399-405.
[19]
陈杰.形态学在地震解释构造特征提取中的应用研究[D].北京:中国石油大学(北京),2016.CHEN Jie.Mathematical Morphology Used in Extraction of Tectonic Feature When Interpreting Seismic Data[D].China University of Petroleum (Beijing),Beijing,2016.
[20]
王润秋,郑桂娟,付洪洲,等.地震资料处理中的形态滤波去噪方法[J].石油地球物理勘探,2005,40(3):277-282.WANG Runqiu,ZHENG Guijuan,FU Hongzhou,et al.Noise-eliminated method by morphologic filtering in seismic data processing[J].Oil Geophysical Prospecting,2005,40(3):277-282.
[21]
WANG R Q,LI Q,ZHANG M.Application of multi-scaled morphology in denoising seismic data[J].Applied Geophysics,2008,5(3):197-203.
