山地地震资料零速度层差分法叠后时间偏移
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摘要
在山地地震资料的常规处理中,速度分析、动校正和叠加通常在CMP面上进行。本文针对山地地震资料的有限差分法叠后时间偏移问题,从起伏地表条件下的理论模型和实际资料两个方面入手,对差分法叠后时间偏移的零速度层方法进行研究,并用不同的填充速度进行了偏移试验。研究表明,在起伏地表和水平基准面之间填充替换速度进行偏移会导致成像误差,而填充零速度层可得到正确的偏移成像结果。
In conventional mountain seismic data processing,the velocity analysis,normal moveout correction and stacking are conducted on CMP plane.Regarding the difference method post-stack time migration in mountain seismic data processing,under the conditions of irregular surface the zero velocity method for difference method post-stack time migration was studied and the migration testing was conducted by using different replacement velocity datasets based on theory model and field data.The studies show that filling replacement velocity between irregular surface and horizontal datum in migration processing could cause imaging error,while filling zero velocity later could obtain accurate imaging results.
In conventional mountain seismic data processing,the velocity analysis,normal moveout correction and stacking are conducted on CMP plane.Regarding the difference method post-stack time migration in mountain seismic data processing,under the conditions of irregular surface the zero velocity method for difference method post-stack time migration was studied and the migration testing was conducted by using different replacement velocity datasets based on theory model and field data.The studies show that filling replacement velocity between irregular surface and horizontal datum in migration processing could cause imaging error,while filling zero velocity later could obtain accurate imaging results.
引文
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[13]蔡杰雄,王华忠,张元巧.非水平地表Kirchhoff积分叠前时间偏移方法研究与应用.北京CPS/SEG会议,2009
[14]钱荣钧.复杂地表区偏移基准面问题研究.石油地球物理勘探,1996,31(1):41～54
[15]刘全新,李道善.关于山地静校正和偏移基准面的一些认识.天然气地球科学,2003,14(1):57～59
[2]何英,王华忠等.复杂地形条件下波动方程叠前深度成像.勘探地球物理进展,2002,25(3):13～19
[3]杨锴,王华忠,程玖兵,马在田.非水平观测面有限差分法叠前波动方程基准面校正.石油地球物理勘探,2002,37(2):154～162
[4]程玖兵,刘玉柱,马在田,陶正喜,李亚林.山前带地震数据的波动方程叠前深度偏移方法.天然气工业,2007,27(2):38～39,48
[5]田文辉,李振春,张辉.直接下延法波动方程叠前深度偏移.石油物探,2006,45(5):447～451
[6]安琪,李振春,叶月明.起伏地表条件下的相位编码叠前深度偏移.勘探地球物理进展,2007,30(3):175～178,206
[7]耿建华,黄海贵,马在田.Kirchhoff积分波场延拓基准面静校正方法研究.同济大学学报(自然科学版),1996,24(6):59～65
[8]陈树文,刘洪.可用于复杂地质体的波动方程基准面技术.地球物理学进展,2002,17(3):365～369
[9]He Jiao,Liu Yuzhu and Geng Jianhua,The study and analysis of floating datum selection for rugged ter-rain.Applied Geophysics,2007,4(2):101～110
[10]Beasley C and Lynn W.The zero-velocity layer:Mi-gration from irregular surfaces.Geophysics,1992,57(11):1435～1443
[11]Moshe Reshef.Depth migration from irregular sur-faces with depth extrapolation methods.Geophysics,1991,56(1):119～122
[12]董春晖,张剑锋.起伏地表下的直接叠前时间偏移.地球物理学报,2009,52(1):239～244
[13]蔡杰雄,王华忠,张元巧.非水平地表Kirchhoff积分叠前时间偏移方法研究与应用.北京CPS/SEG会议,2009
[14]钱荣钧.复杂地表区偏移基准面问题研究.石油地球物理勘探,1996,31(1):41～54
[15]刘全新,李道善.关于山地静校正和偏移基准面的一些认识.天然气地球科学,2003,14(1):57～59
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