摘要
目前,在生产中广泛使用的静校正方法几乎都是基于地表一致性假设的。在地表复杂地区,地形起伏较大,低速带厚度和横向速度变化较大,地表一致性假设往往与实际地质情况不符,在这种情况下再运用地表一致性静校正,势必产生很大的误差。笔者利用模型正演方法着重讨论复杂地区地表一致性静校正误差存在的原因及这种原因跟基准面、炮检距、低速带和基岩速度、低速带厚度、反射面深度等之间的关系,分析其变化规律,提出解决复杂地区静校正问题的建议,以期改进现有的静校正方法,达到减小误差的目的。
Currently,the static correction method widely used in the production is almost always based on surface-consistent hypothesis.However,in complex areas with sharp fluctuant topography and great low velocity layer thickness and transverse velocity change,the surface-consistent hypothesis is sometimes unfit for actual geological conditions;in this case,there must be significant errors if surface consistency static correction is still used.Modeling methods are used in this paper to discuss the cause for surface-consistent hypothesis static errors in complex areas and the relationship of this cause to datum,source-receiver offset,low velocity layer,bedrock speed,low-speed thickness and reflective surfaces depth,with an analysis of the variation regularity,in order to improve the existing static correction method,present a new approach and provide the reference for solving the problem of static correction in complex areas.
出处
《物探与化探》
CAS
CSCD
北大核心
2011年第6期785-788,共4页
Geophysical and Geochemical Exploration
基金
国家重大专项(2008ZX05035)资助
关键词
地震勘探
地表一致性
非地表一致性
静校正
正演模型
seismic exploration
surface consistency
non-surface consistency
refraction static correction
forward modeling
