层析反演静校正技术在宁夏YL地区地震资料处理中的应用
|
摘要
表层模型层析反演是一种非线性模型反演技术,它利用地震初至波射线的走时和路径反演介质速度结构,不受地表及近地表结构纵横向变化的约束。根据正演初至时间与实际初至时间的误差,修正速度模型,经反复迭代,最终达到要求的误差精度。宁夏YL地区表层结构复杂,横向速度变化大,近地表噪声水平较高,引起地震剖面上严重的中、长、短波长静校正问题。在该区宽线二维地震资料处理中采用了层析反演静校正技术,较好地解决了所有波长静校正问题,处理效果明显改善。
Surface model tomography inversion is the technology about non-linear model inversion, which applies the media velocity structure built by the inversion of travel time and path of seismic first arrival ray, without being restricted by longitudinal and latitudinal diversification of surface and near surface structure. Based on the time errors between forward first arrival time and actual first arrival, velocity model keeps to be modified by the means of repeat iterative until the precision of errors meets the requirement. Because of the multiplicity of surface layer structure in YL area, Ningxia, and the complexity of the surface layer structures, the velocity varies rapidly in latitude, and strong noise near the surface appears there, showing the serious problems of the middle-wavelength, long-wavelength and short-wavelength statics in the seismic sections. After being applied tomography inversion statics in this area, the statics problem for all wavelengths were settled, the effect of processing was improved clearly.
Surface model tomography inversion is the technology about non-linear model inversion, which applies the media velocity structure built by the inversion of travel time and path of seismic first arrival ray, without being restricted by longitudinal and latitudinal diversification of surface and near surface structure. Based on the time errors between forward first arrival time and actual first arrival, velocity model keeps to be modified by the means of repeat iterative until the precision of errors meets the requirement. Because of the multiplicity of surface layer structure in YL area, Ningxia, and the complexity of the surface layer structures, the velocity varies rapidly in latitude, and strong noise near the surface appears there, showing the serious problems of the middle-wavelength, long-wavelength and short-wavelength statics in the seismic sections. After being applied tomography inversion statics in this area, the statics problem for all wavelengths were settled, the effect of processing was improved clearly.
引文
1 熊翥.复杂地区地震数据处理思路.北京:石油工业出版社,2002
2 王彦春,余钦范,段云卿.交互迭代静校正方法.石油物探,1998,37(2):63~70
3 杨宝林,田希泰.用近地表模拟实现静校正.石油地球物理勘探,1988,23(5)
2 王彦春,余钦范,段云卿.交互迭代静校正方法.石油物探,1998,37(2):63~70
3 杨宝林,田希泰.用近地表模拟实现静校正.石油地球物理勘探,1988,23(5)
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