叠前时间偏移技术在东濮凹陷应用的认识
摘要
东濮凹陷断裂复杂,多断块、多套生储盖组合,叠后偏移成像效果不佳。叠前时间偏移技术在这一复杂断块区的应用可以改善成像效果。研究提出了一套以速度迭代为核心、地质信息为约束的求取偏移速度场的改进方法,提高了偏移速度的精度;通过对偏移孔径、最大偏移角度、射线路径、去假频4个关键参数处理的分析,得出适合东濮凹陷地震资料特点的经验参数,减少了以后处理过程中的试验工作量和参数试验的盲目性,有效地提高了处理效率。通过叠前时间偏移,提高了复杂断块地区成像精度,能够准确地落实断层位置和认识断块之间的关系,与井资料的吻合程度较高,取得了明显的地质效果。
The features of Dongpu depression in Zhongyuan Oilfield include complex faults,many faulted blocks,multiple sets of source-reservoir-seal assemblages.It is difficult for post-stack migration to get perfect migration imaging effect in complex faulted blocks.However,pre-stack migration can improve the imaging effect.An effective Optimized Method for obtaining migration velocity field for pre-stack time migration is presented,which is based on velocity iteration and constrained by geological information.The method can improve accuracy of migration velocity.Through analyzing four key parameters of pre-stack time migration such as migration aperture,maximum migration angle,ray trace and anti-aliased,some parameter value is proposed,which is effective for the seismic data in Dongpu depression.Consequently,testing workload of processing procedure and blindness of parameter test are decreased so as to increase processing efficiency.Through pre-stack time migration,imaging accuracy in complex faulted blocks is improved,the positions of faults can be accurately ascertained,the relationships among faulted blocks are clarified,which are highly accorded with well data.
The features of Dongpu depression in Zhongyuan Oilfield include complex faults,many faulted blocks,multiple sets of source-reservoir-seal assemblages.It is difficult for post-stack migration to get perfect migration imaging effect in complex faulted blocks.However,pre-stack migration can improve the imaging effect.An effective Optimized Method for obtaining migration velocity field for pre-stack time migration is presented,which is based on velocity iteration and constrained by geological information.The method can improve accuracy of migration velocity.Through analyzing four key parameters of pre-stack time migration such as migration aperture,maximum migration angle,ray trace and anti-aliased,some parameter value is proposed,which is effective for the seismic data in Dongpu depression.Consequently,testing workload of processing procedure and blindness of parameter test are decreased so as to increase processing efficiency.Through pre-stack time migration,imaging accuracy in complex faulted blocks is improved,the positions of faults can be accurately ascertained,the relationships among faulted blocks are clarified,which are highly accorded with well data.
引文
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[8]刘得仁,吴晓泉.叠前时间偏移技术在肇源南地区的应用[J].石油天然气学报,2005,27(2):333-335.
[9]罗银河,刘江平,董桥梁,等.Kirchhoff弯曲射线叠前时间偏移及应用[J].天然气工业,2005,25(8):35-37.
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[11]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.
[12]Yilmaz O.Seismic data analysis[M].Tulsa:Society of Exploration Geophysicists,2001.
[2]王棣,王华忠,马在田,等.叠前时间偏移方法综述[J].勘探地球物理进展,2004,27(05):313-320.
[3]张平平,常旭.保幅偏移中的权函数[J].地球物理学进展,2006,21(1):203-207.
[4]曹孟起,刘占族.叠前时间偏移处理技术及应用[J].石油地球物理勘探,2006,41(3):286-292.
[5]伍志明,李亚林,贺振华,等.高陡复杂构造的地震成像技术进展[J].天然气工业,2004,24(2):40-43.
[6]王锡文,张果,杨春梅.共聚焦点成像技术[J].西南石油学院学报,2004,26(5):10-13.
[7]蒋先勇,王锡文,宋启潮,等.利用共聚焦点(CFP)成像方法的地震正演[J].西南石油学院学报,2005,27(2):17-19.
[8]刘得仁,吴晓泉.叠前时间偏移技术在肇源南地区的应用[J].石油天然气学报,2005,27(2):333-335.
[9]罗银河,刘江平,董桥梁,等.Kirchhoff弯曲射线叠前时间偏移及应用[J].天然气工业,2005,25(8):35-37.
[10]曹孟起,刘占族.叠前时间偏移处理技术及应用[J].石油地球物理勘探,2006,41(3):286-292.
[11]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.
[12]Yilmaz O.Seismic data analysis[M].Tulsa:Society of Exploration Geophysicists,2001.
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