| 非均匀网格层析静校正技术在地震资料处理中的应用 |
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| 引用本文： | 解洁清.非均匀网格层析静校正技术在地震资料处理中的应用[J].中国煤炭地质,2021(1). |
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| 作者姓名： | 解洁清 |
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| 作者单位： | 中国煤炭地质总局地球物理勘探研究院 |
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| 摘 要： | 由于近地表模型速度结构的非均匀性,导致基于均匀网格的近地表速度模型很难达到最优,并同时存在信息冗余的弊端,由此提出了非均匀网格层析静校正方法。非均匀网格化建模方法基于背景速度场、地质构造带速度结构,以及目标地质图速度模型进行三级网格划分,运用一定的追踪方法获取方位角信息与地表初至波走时,将初至波观测走时与计算走时之间的时差分至追踪到各网格中,经近地表速度模型的多次迭代,构建最终速度模型。采用该方法在近地表速度纵、横向变化剧烈地区得到的静校正时间剖面,与其他常规校正方法比较,静校正效果较好。
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| 关 键 词： | 静校正 近地表模型 非均匀网格 时间剖面 |
Application of Non-uniform Grid Tomographic Statics in Seismic Data Processing |
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| Xie Jieqing.Application of Non-uniform Grid Tomographic Statics in Seismic Data Processing[J].Coal Geology of China,2021(1). |
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| Authors: | Xie Jieqing |
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| Institution: | (Geophysical Prospecting Research Institute,CNACG,Zhuozhou,Hebei 072750) |
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| Abstract: | Since the nonuniformity of near surface model velocity structure caused the model based on uniform grid is difficult to achieve optimality and existed drawbacks of information redundancy;thus the non-uniform grid tomographic statics has been introduced.The non-uniform grid modeling is based on background velocity field,geological structural belt velocity structure and target geological map velocity model carried out three levels gridding,through certain tracking method to obtain azimuth information and preliminary wave travel time,taking the moveout points between preliminary wave travel time and computed travel time tracking to each grid,after near surface velocity model multiple iterations,final velocity model has been established.To compare time sections after statics in near surface velocity longitudinal and transversal varying greatly area,the statics effect from this method is better than other traditional correction methods. |
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| Keywords: | statics near surface model non-uniform grid time section |
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