基于约束初至波层析反演的近地表建模技术
|
摘要
地震资料处理中,当地表起伏剧烈,横向速度变化大,高速顶界面不稳定时,采用常规的反演方法建立高精度的速度模型比较困难,针对这种情况,在分析了目前生产中常用的近地表建模各种算法的特点后,提出了基于小折射和微测井约束的层析反演方法,该技术在实际地震资料处理中,可以进一步提高近地表模型的精度,取得较好的静校正效果。
In the land data processing, it is still challenging to construct a reliable and high quality near surface model using the conventional processing and inversion methods in the areas where there is rugged terrain with very strong lateral velocity variation and invisible refraction layers. In order to address the above challenge, we analyze the pros and cons of the current three kinds of the near-surface model building methods that are currently used in the industry. Furthermore, a new constrained tomography inversion algorithm has been proposed and developed that uses both upholes and small refraction survey information as constraints. Our tomographic method takes advantage of each method’s merits and has been successfully applied to the land data. The field examples show that this inversion method yields more accurate near-surface models that match well with geologic features.
In the land data processing, it is still challenging to construct a reliable and high quality near surface model using the conventional processing and inversion methods in the areas where there is rugged terrain with very strong lateral velocity variation and invisible refraction layers. In order to address the above challenge, we analyze the pros and cons of the current three kinds of the near-surface model building methods that are currently used in the industry. Furthermore, a new constrained tomography inversion algorithm has been proposed and developed that uses both upholes and small refraction survey information as constraints. Our tomographic method takes advantage of each method’s merits and has been successfully applied to the land data. The field examples show that this inversion method yields more accurate near-surface models that match well with geologic features.
引文
[1]张继国,刘连升.复杂区初至层析反演静校正[J].石油地球物理勘探,2006,41(4):383-385.
[2]李卫忠.复杂地表近地表建模与静校正[J].油气地质与采收率,2007,16(3):73-76.
[2]李卫忠.复杂地表近地表建模与静校正[J].油气地质与采收率,2007,16(3):73-76.