初至波层析反演表层速度的应用实践  

Application Practices of Preliminary Wave Tomographic Inversion Near-surface Velocity

作　　者：郎玉泉[1] Lang Yuquan(Geophysical Prospecting Research Institute,CNACG,Zhuozhou,Hebei 072750)

机构地区：[1]中国煤炭地质总局地球物理勘探研究院,河北涿州072750

出　　处：《中国煤炭地质》2018年第3期76-81,共6页Coal Geology of China

摘　　要：与传统的静校正方法相比,初至波层析速度反演不受近地表结构变化的约束,可以得到准确的近地表速度模型。以山西某地活断层、新疆沙漠地区及瓦岗川地区的地震勘探为例,介绍了在地层埋藏浅、地表高程变化大或表层起伏小、但下伏老地层起伏大的情况下,可以利用拾取初至波旅行时进行层析速度反演,获得满足要求的速度模型;而对于近地表地形与下伏地层变化剧烈的复杂地区,其静校正需以初至波层析反演的表层速度作为初始模型,通过数据平滑等多次迭代处理,获得折射波静校正近地表模型,进而计算静校正量。实际应用表明,初至波层析速度反演可以广泛应用于沙漠、山地、沼泽和海洋等复杂地区的静校正工作。Comparison with the traditional statics,owing to preliminary wave tomographic velocity inversion is unrestrained by near-surface structural changes,can archive accurate near-surface velocity model.Taking seismic prospecting of an active fault in Shanxi,desert area in Xinjiang and Wagangchuan area in Gansu as examples,have introduced strata shallowly buried,surface elevation greatly variable or surface less undulated,but underlying older strata undulated greatly,can use preliminary wave travel time picking carry out tomographic velocity inversion,obtained satisfied velocity model.To near-surface land configuration and underlying strata dramatically transformed complicated areas,statics should take surface velocity from preliminary wave tomographic inversion as the initial model,through multiple iteration processing of data smooth off etc,obtained reflection statics near-surface model,and then computed statics.The practical applications have shown that the preliminary wave tomographic velocity inversion can be widely applied in statics for complicated areas of desert,mountainous region,swamp,ocean etc.

关 键 词：初至波 层析速度反演 静校正 活断层 

分 类 号：P631.4[天文地球—地质矿产勘探]