利用叠前Kirchhoff积分偏移识别小断裂与低幅度构造
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摘要
利用常规地震剖面精细解释小断层和低幅度构造存在较大困难.本文利用纵波和横波速度模型对采集得到的二维地震数据进行叠前Kirchhoff积分偏移得到纵波和转换横波深度和时间剖面,根据不同分量的深度和时间剖面联合解释小断层与低构造.深度剖面克服了时间剖面受地层厚度和地层速度共同制约的缺点,有利于识别低幅度构造.纵波(P)剖面与转换横波(PS)剖面相比有利于识别层间小断裂.我们对准噶尔盆地实际地震资料的处理和解释证实了这些优点.
It is very difficult to interpret small faults and low-amplitude structures using the conventional seismic section.In this paper,both compress wave(P) and converted shear wave(PS) velocity models are applied in prestack Kirchhoff migration to process 2D seismic data and gained P wave and PS wave time and depth sections respectively,which are then used to interpret low-amplitude structures and small faults.The depth section overcomes the shortage of the time section,which can be influenced by the thickness and velocity of layers jointly,and shows the thickness of strata distinctly.PS section has more advantage over P section in identifying small faults.These merits are verified by our processing and interpretation of the seismic data in Zhungaer basin.
It is very difficult to interpret small faults and low-amplitude structures using the conventional seismic section.In this paper,both compress wave(P) and converted shear wave(PS) velocity models are applied in prestack Kirchhoff migration to process 2D seismic data and gained P wave and PS wave time and depth sections respectively,which are then used to interpret low-amplitude structures and small faults.The depth section overcomes the shortage of the time section,which can be influenced by the thickness and velocity of layers jointly,and shows the thickness of strata distinctly.PS section has more advantage over P section in identifying small faults.These merits are verified by our processing and interpretation of the seismic data in Zhungaer basin.
引文
[1]R.E.谢里夫,L.P.吉尔达特著.《勘探地震学》(第二版)[M].初英,李承楚等译.北京:石油工业出版社,1999.
[2]张钋,李幼铭,刘洪.几类叠前深度偏移方法的研究现状[J].地球物理学进展,2000,15(2):30~39.
[3]沈财余,冷传波等.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.
[4]陈宝国,李松康等.地震资料叠前偏移处理技术应用[J].中国海上油气(地质),2001,15(5):361~364.
[5]黄凯等.利用叠前克希霍夫积分偏移提取纵横波进行油气检测[J].石油物探,1997,36(2):1~6.
[6]秦福浩等.弹性波克希霍夫偏移法[J].地球物理学报,1988,31(5):577~578.
[7]汪鹏程等.单分量资料弹性波克希霍夫积分偏移[R].《塔里木盆地油气资源》攻关成果报告(85-101-05-07),1995,68~86.
[8]王妙月.地震波偏移讲稿,《中国科学技术大学研究生院讲义》[J].1983.
[9]王建立.二维叠前深度偏移及辅助处理流程方法研究[J].石油地球物理勘探,1999,34(增刊):1~12.
[10]李录明,罗省贤.P-P波及P-SV波叠前深度偏移速度模型建立方法[J].地球物理学报,1998,41(3):305~318.
[11]Keho T H,Beydoun W B.Paraxial ray Kirchhoff migration[J].Geophysics,1988,53:1540~1546.
[2]张钋,李幼铭,刘洪.几类叠前深度偏移方法的研究现状[J].地球物理学进展,2000,15(2):30~39.
[3]沈财余,冷传波等.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.
[4]陈宝国,李松康等.地震资料叠前偏移处理技术应用[J].中国海上油气(地质),2001,15(5):361~364.
[5]黄凯等.利用叠前克希霍夫积分偏移提取纵横波进行油气检测[J].石油物探,1997,36(2):1~6.
[6]秦福浩等.弹性波克希霍夫偏移法[J].地球物理学报,1988,31(5):577~578.
[7]汪鹏程等.单分量资料弹性波克希霍夫积分偏移[R].《塔里木盆地油气资源》攻关成果报告(85-101-05-07),1995,68~86.
[8]王妙月.地震波偏移讲稿,《中国科学技术大学研究生院讲义》[J].1983.
[9]王建立.二维叠前深度偏移及辅助处理流程方法研究[J].石油地球物理勘探,1999,34(增刊):1~12.
[10]李录明,罗省贤.P-P波及P-SV波叠前深度偏移速度模型建立方法[J].地球物理学报,1998,41(3):305~318.
[11]Keho T H,Beydoun W B.Paraxial ray Kirchhoff migration[J].Geophysics,1988,53:1540~1546.
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