Abstract：The footwall of large faults in Changyuan Oilfield,Daqing shows a triangular fault shadow zone on seismic sections.Seismic events of the shadow zones are often pulled up,pulled down,or uncontinuous,which lead to a great structural interpretation uncertainty.In order to quantitatively analyze characteristics of the fault shadow zone,a series of 2D forward models are built based on the geological information of the study area.According to our research,the fault shadow zones are caused by lateral velocity changes on both sides of faults,and fault throws and low velocity zones are the main influence factors of the fault shadow zone.The 3D space-variant velocity field is proposed to correct the fault shadow in dense well patterns,which improves effectively structural interpretation nearby the large fault and provides technical support for the future development of Changyuan Oilfield.
王彦辉,司丽,朴昌永,等.井震结合断层解释应注意的几个问题[J].西南石油大学学报(自然科学版),2016,38(5):50-58.WANG Yanhui,SI Li,PIAO Changyong,et al.Discussion on several issues of integrated well-to-seismic fault interpretation[J].Journal of Southwest Petroleum University (Science & Technology Edition),2016,38(5):50-58.
[2]
Fagin S.The fault shadow problem:Its nature and elimination[J].The Leading Edge,1996,15(9):1005-1013.
[3]
黄诚,杨飞,李鹏飞.利用正演模拟识别各类地震假象[J].工程地球物理学报,2013,10(4):493-496.HUANG Cheng,YANG Fei,LI Pengfei.The use of forward modeling to indentify various seismic illu-sions[J].Chinese Journal of Engineering Geophy-sics,2013,10(4):493-496.
[4]
龚幸林,吴育林,杨晓,等.地震反射同相轴畸变的正演分析方法——在阿姆河右岸区块的应用[J].天然气工业,2010,30(5):34-36.GONG Xinglin,WU Yulin,YANG Xiao,et al.Appli-tion of the forward modeling method of event distortion in the Amu Darya Right Bank Block,Turkmenistan[J].Natural Gas Industry,2010,30(5):34-36.
[5]
陈海清,戴晓云,潘良云,等.时间剖面上的假构造及其解决方法[J].石油地球物理勘探,2009,44(5):590-597.CHEN Haiqing,DAI Xiaoyun,PAN Liangyun,et al.False structures on time domain seismic sections and corresponding resolutions[J].Oil Geophysical Prospecting,2009,44(5):590-596.
[6]
郝守玲,赵群.横向速度变化对构造成像影响的物理模拟研究[J].石油物探,2008,47(1):49-54.HAO Shouling,ZHAO Qun.Physical modeling research for the effect of lateral velocity on structural imaging[J].Geophysical Prospecting for Petroleum,2008,47(1):49-54.
[7]
刘南,李熙盛,侯月明,等.模型正演在断层阴影带内构造研究中的作用[J].西南石油大学学报(自然科学版),2016,38(5):65-74.LIU Nan,LI Xisheng,HOU Yueming,et al.Research structure of fault shadow zone by forward modeling[J].Journal of Southwest Petroleum University (Science & Technology Edition),2016,38(5):65-74.
[8]
宋亚民,赵红娟,董政.基于地震正演的断层阴影校正技术及其在南海A油田的应用研究[J].工程地球物理学报,2013,13(4):521-527.SONG Yamin,ZHAO Hongjuan,DONG Zheng.Seismic wave forward modeling based fault shadow correction technology and its application to Nanhai A oil-field[J].Chinese Journal of Engineering Geophysics,2013,13(4):521-527.
[9]
许先华,张静,杨勤林,等.正演方法识别滨里海中区块岩下真假构造[J].地球物理学进展,2013,28(2):830-837.XU Xianhua,ZHANG Jing,YANG Qinlin,et al.The sub-salt structure recognition by using of seismic forward modeling method in block middle of Pre-caspian basin[J].Progress in Geophysics,2013,28(2):830-837.
[10]
熊晓军,贺振华,文晓涛,等.偏移速度误差引起的假象分析[J].西南石油大学学报(自然科学版),2007,29(6):24-26.XIONG Xiaojun,HE Zhenhua,WEN Xiaotao,et al. Analysis of pseudo phenomena caused by migration velocity error[J].Journal of Southwest Petroleum University (Science & Technology Edition),2007,29(6):24-26.
[11]
梅金顺,王润秋,于志龙,等.叠前深度偏移对速度场敏感性分析[J].石油地球物理勘探,2013,48(3):372-378.MEI Jinshun,WANG Runqiu,YU Zhilong,et al.The sensitivity of prestack depth migration to the velocity field[J].Oil Geophysical Prospecting,2013,48(3):372-378.
[12]
罗勇,张龙,马俊彦,等.复杂构造地震叠前深度偏移速度模型构建及效果[J].新疆石油地质,2013,34(5):576-579.LUO Yong,ZHANG Long,MA Junyan,et al.The pre-stack depth migration velocity model for complex geological structure in southern margin of Junggar basin:modeling and effect[J].Xinjiang Petroleum Geo-logy,2013,34(5):576-579.
[13]
肖艳玲,范旭,王晓涛,等.网格层析速度反演技术在齐古背斜叠前深度偏移中的应用[J].石油地球物理勘探,2017,52(增刊2):98-103.XIAO Yanling,FAN Xu,WANG Xiaotao,et al.Mesh tomographic velocity inversion for the prestack depth migration of Qigu anticline[J].Oil Geophysical Prospecting,2017,52(S2):98-103.
刘定进,蒋波,李博,等.起伏地表逆时偏移在复杂山前带地震成像中的应用[J].石油地球物理勘探,2016,51(2):315-324.LIU Dingjin,JIANG Bo,LI Bo,et al.Rugged-tomography reverse time migration in complex piedmont zone[J].Oil Geophysical Prospecting,2016,51(2):315-324.
[16]
沈财余,冷传波,杨长春.地震资料叠前深度偏移在CD地区的应用[J].石油地球物理勘探,1997,32(4):463-471.SHEN Caiyu,LENG Chuanbo,YANG Changchun.Application of depth migration to seismic data from CD area[J].Oil Geophysical Prospecting,1997,32(4):463-471.
[17]
程玉坤,刘建红,周振晓,等.速度建模特色技术的实际应用[J].石油地球物理勘探,2017,52(增刊2):110-115.CHENG Yukun,LIU Jianhong,ZHOU Zhenxiao,et al.Depth-domain velocity model building for prestack depth imaging[J].Oil Geophysical Prospecting,2017,52(S2):110-115.
[18]
荣骏召,芦俊,李建峰,等.矢量Kirchhoff叠前深度偏移[J].石油地球物理勘探,2017,52(6):1170-1176.RONG Junzhao,LU Jun,LI Jianfeng,et al.Vector prestack depth migration based on Kirchhoff integral equation[J].Oil Geophysical Prospecting,2017,52(6):1170-1176.
[19]
张广智,常德宽,王一惠,等.波动方程叠前深度偏移角度道集求取方法[J].石油地球物理勘探,2016,51(3):529-536.ZHANG Guangzhi,CHANG Dekuan,WANG Yihui,et al.Angle domain common-image gather calculation based on wave equation prestack depth migration[J].Oil Geophysical Prospecting,2016,51(3):529-536.
[20]
段文胜,李飞,黄录忠,等.OVT域宽方位层析速度建模与深度域成像[J].石油地球物理勘探,2016,51(3):521-528.DUAN Wensheng,LI Fei,HUANG Luzhong,et al.Wide azimuth tomographic velocity model building and depth imaging in the OVT domain[J].Oil Geophysical Prospecting,2016,51(3):521-528.
