MD复杂山地低信噪比地震资料处理技术
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摘要
MD地区地表地形起伏大,地下构造复杂,高陡构造发育地段地震资料信噪比低,速度难以准确求取,因此,偏移成像剖面上构造形态的可靠性低。分析了影响构造落实的处理难点,提出了包括多线联合层析静校正、叠前强干扰波压制、波组一致性处理等基础处理技术;采用DMO速度分析、加密速度分析、速度扫描与速度谱相结合的速度分析建立偏移速度场,用VSP实测速度进行标定的井控叠前时间偏移等方法,提高复杂构造的叠前偏移成像的可靠性。应用该套处理技术对MD地区的实际资料进行了处理,剖面质量得到了明显提高。
MD area is characterized by rugged surface and complex subsurface structures.At the high-steep structure area,the S/N of seismic data is low and its velocity is difficult to obtain.Therefore,the structure pattern on migration section has low reliability.We analyzed the processing difficulties for structure ascertaining,and proposed some basic processing techniques,including multi-line joint tomographic static correction,prestack strong interference suppression,wave group consistency processing.Migration velocity field was established by DMO velocity analysis,dense-velocity analysis,combined with velocity scanning and velocity spectrum,and well-controlling pre-stack time migration was calibrated by VSP measured velocity,which improved the reliability of prestack migration of complex structures.The series of processing techniques were applied on actual data from MD,and the result indicates that the S/N of seismic sections was largely increased.
MD area is characterized by rugged surface and complex subsurface structures.At the high-steep structure area,the S/N of seismic data is low and its velocity is difficult to obtain.Therefore,the structure pattern on migration section has low reliability.We analyzed the processing difficulties for structure ascertaining,and proposed some basic processing techniques,including multi-line joint tomographic static correction,prestack strong interference suppression,wave group consistency processing.Migration velocity field was established by DMO velocity analysis,dense-velocity analysis,combined with velocity scanning and velocity spectrum,and well-controlling pre-stack time migration was calibrated by VSP measured velocity,which improved the reliability of prestack migration of complex structures.The series of processing techniques were applied on actual data from MD,and the result indicates that the S/N of seismic sections was largely increased.
引文
[1]王增明.准噶尔盆地北缘二维地震资料的空变分析处理方法[J].石油物探,2006,45(3):290-293
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[5]刘建芳,华伟,王士昆,等.江苏低信噪比地区深层地震资料处理方法研究[J].石油物探,2008,47(6):583-587
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[8]熊永学,黄青宇,晁元萍,等.FOCUS系统在低信噪比资料处理中的去噪方法探讨[J].石油物探,2002,41(增刊):290-294
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[10]胡自多,吕锡敏,王建华.库车地区高陡构造低信噪比资料处理方法研究[J].石油地球物理勘探,2002,37(增刊):108-117
[11]云美厚,宋玉龙,丁伟,等.镇巴复杂山地地震成像质量影响因素及对策[J].勘探地球物理进展,2006,29(1):42-47
[12]王华忠,李伟波,张元巧.起伏地表条件下偏移到多偏移距叠前时间偏移[J].勘探地球物理进展,2007,30(5):361-367
[13]何光明,贺振华,黄德济,等.叠前时间偏移技术在复杂地区三维资料处理中的应用[J].天然气工业,2006,26(5):46-48
[2]范旭.准噶尔盆地南缘复杂山地地震资料处理技术和效果[J].石油物探,2002,41(增刊):313-318
[3]马义忠,于更新,符力耘.复杂地表低信噪比地震数据处理研究[J].地球物理学进展,2008,23(6):1849-1858
[4]覃天,王彦春,凌勋.准噶尔盆地低信噪比地震资料处理方法[J].石油物探,2005,44(6):593-597
[5]刘建芳,华伟,王士昆,等.江苏低信噪比地区深层地震资料处理方法研究[J].石油物探,2008,47(6):583-587
[6]张亚斌.焉耆盆地低信噪比地震资料处理方法[J].石油物探,2004,43(2):185-187
[7]王世青,孟小红,王双喜,等.兴安岭山地低信噪比地震资料处理技术分析[J].石油物探,2007,46(2):187-192
[8]熊永学,黄青宇,晁元萍,等.FOCUS系统在低信噪比资料处理中的去噪方法探讨[J].石油物探,2002,41(增刊):290-294
[9]华勇,顾庆雷.合肥盆地复杂地表地震资料处理方法研究[J].石油物探,2003,42(1):89-92
[10]胡自多,吕锡敏,王建华.库车地区高陡构造低信噪比资料处理方法研究[J].石油地球物理勘探,2002,37(增刊):108-117
[11]云美厚,宋玉龙,丁伟,等.镇巴复杂山地地震成像质量影响因素及对策[J].勘探地球物理进展,2006,29(1):42-47
[12]王华忠,李伟波,张元巧.起伏地表条件下偏移到多偏移距叠前时间偏移[J].勘探地球物理进展,2007,30(5):361-367
[13]何光明,贺振华,黄德济,等.叠前时间偏移技术在复杂地区三维资料处理中的应用[J].天然气工业,2006,26(5):46-48
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