| 初至旅行时层析反演近地表模型精度分析 |
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| 引用本文： | 李宇,杨德义,邓辉,严锐,陈凤英.初至旅行时层析反演近地表模型精度分析[J].石油地球物理勘探,2011(2):221-225,158. |
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| 作者姓名： | 李宇 杨德义 邓辉 严锐 陈凤英 |
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| 作者单位： | 中国矿业大学(北京)煤炭资源与安全开采国家重点实验室;太原理工大学矿业工程学院;有色金属华东地质勘查局资源调查与评价研究院; |
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| 摘 要： | 为了提高初至旅行时层析反演近地表速度模型的精度,改善静校正效果,本文研究了激发井深以及约束速度对反演精度的影响。通过建立典型低降速层近地表模型,首先对比分析零井深、井深穿过低速层和井深穿过降速层三种情况下,射线穿过网格的特性及激发井深在低速层以下时,最小约束速度对低速层反演效果的影响;其次利用井口时间确定最小约束速度,并提出了辅助点激发确定最小约束速度的新方法;最后应用于合成与实际地震数据,提高了反演精度。
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| 关 键 词： | 初至旅行时 层析反演 近地表模型 激发井深 约束速度 |
Analysis on inversion accuracy of near-surface model inversed by first break traveltime tomography |
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| Li Yu,Yang De-yi,Deng Hui,Yan Rui, Chen Feng-yin..State Key Laboratory of Coal Resources , Safe Mining,China University of Mining & Technology,Beijing,China.Mining Engineering College,Taiyuan University of Technology,Taiyuan,Shanxi,China.Analysis on inversion accuracy of near-surface model inversed by first break traveltime tomography[J].Oil Geophysical Prospecting,2011(2):221-225,158. |
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| Authors: | Li Yu Yang De-yi Deng Hui Yan Rui Chen Feng-yinState Key Laboratory of Coal Resources Safe Mining China University of Mining & Technology Beijing ChinaMining Engineering College Taiyuan University of Technology Taiyuan Shanxi China |
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| Affiliation: | Li Yu1,Yang De-yi2,Deng Hui3,Yan Rui1,and Chen Feng-yin1.1.State Key Laboratory of Coal Resources and Safe Mining,China University of Mining & Technology,Beijing,100083,China2.Mining Engineering College,Taiyuan University of Technology,Taiyuan,Shanxi,030024,China3.Institute of Resource Survey and Assessment,East China Mineral Exploration and Development Bureau,Nanjing,Jiangsu,210007,China |
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| Abstract: | In order to improve the inversion accuracy of near-surface model inversed by first break traveltime tomography,and then to enhance static corrections more effective,the paper discusses the impact of source depth and constraint velocity on the inversion accuracy.Based on typical synthetic near-surface model,we adopt analysis on the characteristic of ray paths from the source on the surface,the source below weathering and the source below sub-weathering.We discuss the impact of the minimum constraint velocity... |
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| Keywords: | first break traveltime tomography inversion near-surface model source depth constraint velocity |
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