剩余零时差对接线连片成图法及其在徐家围子断陷三维连片构造成图中的应用
|
摘要
为消除三维地震工区间时差对连片构造成图的影响,根据地震反射标准层统计、分析资料叠合区t0时差,确定速度联合建场和构造连片成图的平均时差校正方案、方法,再根据剩余时差平面图确定剩余零时差对接线,以消除无规律的剩余时差影响。时差校正最终达到了使资料对接线两侧等t0线落差不超过1个等高距且产状一致性较好,速度场值接近且趋势相同的效果。该方法采取对地震速度谱和地震成图层位(或segy数据体)t0时间进行加减常量式的校正,既能有效地消除工区间的时差,基本实现等t0图和速度场的"无缝"对接,又可避免对接区构造形态和速度场趋势的畸变。为保证时差校正的准确性,方法适用于具有地震反射标准层和一定面积重叠的三维地震资料。
To eliminate the influence of time difference to merging structural maps between 3D seismic work areas,t0 time difference for data overlapping areas have been calculated and analyzed according to the seismic reflection marker.Then the program and method for the establishment of velocity combination field and the average TEC of structural merging maps will be determined,and the residual zero time difference jointing line will be determined based on the residual time difference flat sheet to eliminate the effect of the irregular residual time difference.The TEC can finally makes the downthrow of t0 lines on both sides of data joints lines less than 1 vertical interval with better occurrence conformity,and the velocity field values are close with the same tendency.According to this method,constant plus and minus correction is applied to seismic velocity spectrum and seismic restitution horizon(or segy data object) at t0 time.This method can not only effectively eliminate the time difference between work areas to get seamless jointing of iso-t0 map and velocity field,but also avoid the distortion of structural attitude and velocity field tendency in jointing area.In order to ensure the accuracy of TEC,it's better to apply this method to 3D seismic data with seismic reflection marker and certain overlapping area.
To eliminate the influence of time difference to merging structural maps between 3D seismic work areas,t0 time difference for data overlapping areas have been calculated and analyzed according to the seismic reflection marker.Then the program and method for the establishment of velocity combination field and the average TEC of structural merging maps will be determined,and the residual zero time difference jointing line will be determined based on the residual time difference flat sheet to eliminate the effect of the irregular residual time difference.The TEC can finally makes the downthrow of t0 lines on both sides of data joints lines less than 1 vertical interval with better occurrence conformity,and the velocity field values are close with the same tendency.According to this method,constant plus and minus correction is applied to seismic velocity spectrum and seismic restitution horizon(or segy data object) at t0 time.This method can not only effectively eliminate the time difference between work areas to get seamless jointing of iso-t0 map and velocity field,but also avoid the distortion of structural attitude and velocity field tendency in jointing area.In order to ensure the accuracy of TEC,it's better to apply this method to 3D seismic data with seismic reflection marker and certain overlapping area.
引文
[1]邱勇松,宋霞,李传江.榆树林油田地震资料连片处理解释技术的研究与应用[J].大庆石油地质与开发,2004,23(2):71-73.
[2]周绪文.反射波地震勘探方法[M].北京:石油工业出版社,1989.
[2]周绪文.反射波地震勘探方法[M].北京:石油工业出版社,1989.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心