摘要
沉积地层"速度—深度"线性模型仅考虑了沉积物压实作用,无法适应沉积地层厚度达到一定程度时,或者其他构造因素起作用时,速度随深度的增长率减小的情况。因此,笔者比较了指数公式、幂函数和二次多项式的数学性质,并应用于地震剖面速度谱"时间—层速度"关系的拟合,以拟合优度大小为依据,在不同区域采用二次多项式和幂函数分别拟合,称为地震剖面沉积地层多公式拟合时深转换方案。该方案可应对各种构造环境中沉积地层的时深转换工作,可适用范围较广。
Compaction is the only consideration for’velocity-depth’linear model of sedimentary strata.With the velocity spectra data along a multi-channel seismic profile in deep-water area of South China Sea basin and by applying the’velocity-depth’linear model to the interpreted data of the profile,the authors obtained direct results for geological interpretation.In addition,through the creation of visual workflow and the consideration of horizontal variation of sedimentary interval velocity within the depth conversion procedures,the authors made the results of depth conversion more reliable.In the end,the authors gave a discussion on the limitation and further application of’velocity-depth’linear model both from theory and practice,which deserves consideration in further work.
作者
汪俊
徐子英
任卫波
WANG Jun;XU Zi-Ying;REN Wei-Bo(Guangzhou Marine Geology Survey,Guangzhou 510760,China;Key Laboratory of Marine Mineral Resources,Ministry of Natural Resources,Guangzhou 510760,China;Guangdong Underground Piping&Wiring Networks Engineering Survey Company,Guangzhou 510075,China)
出处
《物探与化探》
CAS
北大核心
2020年第1期149-155,共7页
Geophysical and Geochemical Exploration
基金
中国地质调查局海洋专项项目(GZH201100205,DD20160138,DD20189642,DD20190627)
国家自然科学基金项目(41606080,41576068).
关键词
地震剖面
复杂沉积区
指数公式
幂函数
二次多项式
多公式拟合
时深转换
seismic profile
complicated sedimentary area
exponential formula
power function
2nd-order polynomial
multi-functions fitting
time-to-depth conversion
