RG值应是等效低速带的静校正量
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摘要
本文讨论了复杂地表条件下数据处理中与静校正有关的等效低速带、浮动基准面、固定基准面等概念 ;阐明当前常用的两步法静校正中的 RG值代表等效低速带相对固定基准面的静校正量 ;对地震数据应用静校正高频分量后 ,t0 零点对应于等效低速带的顶界面 ;通过理论记录说明低速带速度、厚度横向变化对时深转换的影响 ,当低速带结构横向变化较大时 ,叠加速度也随着变化 ,故时深转换必须考虑低速带对叠加速度的影响。
The paper discussed the concepts of equivalent low-velocity zone(LVZ),floating datum and fixed datum related to static corrections in data processing in complex subsurface conditions;expounded that the RG values in common-used two-step static corrections method represents the statics of relatively fixed datum in equivalent LVZ;the zero point of t 0 value corresponds to top interface of equivalent LVZ after application of the high-frequency components of statics to seismic data;the influence of LVZ velocity and lateral change of thickness on time-to-depth inversion was described by theoretical records,the stack velocities also change when the lateral structures of LVZ have larger variation,so the influence of LVZ on stack velocities should be considered in time-to-depth inversion.
The paper discussed the concepts of equivalent low-velocity zone(LVZ),floating datum and fixed datum related to static corrections in data processing in complex subsurface conditions;expounded that the RG values in common-used two-step static corrections method represents the statics of relatively fixed datum in equivalent LVZ;the zero point of t 0 value corresponds to top interface of equivalent LVZ after application of the high-frequency components of statics to seismic data;the influence of LVZ velocity and lateral change of thickness on time-to-depth inversion was described by theoretical records,the stack velocities also change when the lateral structures of LVZ have larger variation,so the influence of LVZ on stack velocities should be considered in time-to-depth inversion.
引文
[1] 刘治凡.基于浮动基准面的两步法静校正.石油物探,1998,37(1):136～142
[2] 吕焕通等.RG线的认识及时深转换的基准面问题.石油地球物理勘探,2003,38(1):35～37
[3] 刘治凡等.复杂地表区基准面和静校正方法选择.石油物探,2003,42(2):240～247
[4] 阎世信.山地地球物理勘探技术.北京:石油工业出版社,2000,65～66
[5] 林伯香.最小静校正误差浮动基准面方法.石油地球物理勘探,2003,38(6):611～617
[6] 林伯香等.正确理解浮动基准面概念.石油物探,2005,44(1):(待刊)
[2] 吕焕通等.RG线的认识及时深转换的基准面问题.石油地球物理勘探,2003,38(1):35～37
[3] 刘治凡等.复杂地表区基准面和静校正方法选择.石油物探,2003,42(2):240～247
[4] 阎世信.山地地球物理勘探技术.北京:石油工业出版社,2000,65～66
[5] 林伯香.最小静校正误差浮动基准面方法.石油地球物理勘探,2003,38(6):611～617
[6] 林伯香等.正确理解浮动基准面概念.石油物探,2005,44(1):(待刊)
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