新疆石油地质

新疆石油地质 ›› 2000, Vol. 21 ›› Issue (1): 30-32.

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两种平均速度提取方法的比较及应用

左龙凭, 李铁, 刘丽   

  1. 西北石油局规划设计研究院 新疆乌鲁木齐830011
  • 收稿日期:1999-05-10 出版日期:2000-01-01 发布日期:2021-01-15
  • 作者简介:左龙凭( 1966-),女,汉,新疆昌吉人,工程师,地球物理勘探。

Comparison of two Seismic Average Velocity Extraction Methods and Its Application

Zuo Longping, Li Tie, Liu Li   

  1. Female, Engineer, Geophysical Prospecting, Research Institute of Planning and Designing, Northwest Petroleum Bureau, Urumqi, Xinjiang 830011
  • Received:1999-05-10 Online:2000-01-01 Published:2021-01-15

摘要： 在塔里木盆地北部地区,地震资料常规解释提取的界面平均速度规律性差,闭合差和闭合差的均方差大,在对界面平均速度编辑平滑过程中人为因素大,导致提取的界面平均速度和时深转换的构造深度精度低。针对上述问题,提出了另一种界面平均速度提取方法,其步骤为：选择一种拟合函数对叠加速度一时间进行拟合；统计分析出拟合函数系数闭合差中的系统部分并对其进行校正,实现对叠加速度闭合差的校正；依据积分形式的ＤＩＸ公式和经过闭合差校正后的拟合函数,通过变换得到界面平均速度、界面深度与界面反射时间之间的函数关系。

关键词: 叠加速度, 平均速度, 层速度, 拟合, 函数

Abstract: In conventional interpretation of seismic data in northerm area of Tarim basin, the interfacial average velocity was extracted with poor regularity, big mean square deviation between closures, and big artificial factors during the adjustment of seismic interfacial average velocity, leading to low accuracy of extracted interfacial average velocity and structural depth after time-to-depth conversion. For this reason, this paper presented an another method for extraction of interfacial average velocity, in which a fitting function was selected to match stacking velocity vs time, statistically analyze systematic part from coefficient closure of fitting function and correct it, fulfill correction of stacking velocity closure, and offer interfacial average velocity and interfacial depth as function of interfacial reflected time by transform according to intergral formula DIX and fitting function subjected to closure corrections.

Key words: Stacking velocity, Average velocity, Interval velocity, Fitting, Function