变速三维地震速度场的构建与应用
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摘要
二连盆地内的凹陷窄而狭长,断裂发育,构造变化剧烈,速度横向变化快,常规作图方法难以满足精细构造解释的要求。采用叠前时间偏移后的叠加速度谱生成速度模型,并用井震标定速度进行校正,形成高精度的变速三维速度场,用它对地震层位作时深转换,较大地提高了构造成图的精度。
Depressions in Erlian Basin are long and narrow with complex faults and structures.Challenges for correct structure mapping include complex structure imaging and sharply lateral variable velocity analysis.Traditional methods by using stack velocity spectrum do not meet the demands of high precision seismic interpretations.The improved structure mapping in this paper involves the following steps:(1) creating velocity model by stacking velocity spectrum based on seismic pre-stack time migration data;(2) calibration of the velocity model with well log and seismic data and building up a transversely variable 3D seismic velocity model;and (3) implementing time-depth conversion for target layers using the revised velocity model.Real seismic data processing in Erlian Basin shows that the transversely variable 3D seismic velocity model can be used to improve complex structure mapping.
Depressions in Erlian Basin are long and narrow with complex faults and structures.Challenges for correct structure mapping include complex structure imaging and sharply lateral variable velocity analysis.Traditional methods by using stack velocity spectrum do not meet the demands of high precision seismic interpretations.The improved structure mapping in this paper involves the following steps:(1) creating velocity model by stacking velocity spectrum based on seismic pre-stack time migration data;(2) calibration of the velocity model with well log and seismic data and building up a transversely variable 3D seismic velocity model;and (3) implementing time-depth conversion for target layers using the revised velocity model.Real seismic data processing in Erlian Basin shows that the transversely variable 3D seismic velocity model can be used to improve complex structure mapping.
引文
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[2]王玉梅,李东波,马丽芳,等.速度异常分析与构造成图技术研究[J].石油物探,2003,42(1):102.
[3]李明娟,李守济,牛滨华.地震速度谱在精细深度图制作中的应用[J].石油物探,2004,43(3):272.
[4]王树华,刘怀山,张云银,等.变速成图方法及应用研究[J].中国海洋大学学报,2004,34(1):139.
[5]杨军,王永刚,杨颜敏,等.阿尔及利亚416a—417区块构造精细成图方法[J].石油物探,2007,46(3):294.
[6]王蕴,朱贵生,王芳.精细构造解释与储层预测技术在腰英台地区勘探中的应用[J].勘探地球物理进展,2005,28(40):285.
[7]秦伟军,张永华,全书进.精细构造解释与储层预测技术在泌阳凹陷中南部地区二次勘探中的应用[J].石油物探,2004,43(1):62.
[8]杨德州,金心国,宣小石,等.江苏地区中、古生界构造成图方法研究及其应用效果[J].石油地球物理勘探,2001,36(5):618.
[9]王香文.东岭地区三维速度模型的建立与应用[J].勘探地球物理进展,2006,29(6):412.
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