【摘要】 本文针对低幅度构造区和深层、超深层构造区成图的难点,提出了相应的速度建场和变速成图方法——分层剖析变速成图法。把地质、地震、测井紧密地结合在一起;把需要解释的三维地震数据体按盆地的三重结构(盆前、盆地、盆后)划分为若干个地质场进行解释。通过运用层速度、层时差和层厚度等层参数,用声波测井资料分地质场建立层速度场;然后用层速度场与层间时差相乘,得到各层系的等厚图;逐层累加便可得到各中、深层的等深构造图。由分层剖析变速成图产生的图件,更逼近真实的地下地质构造形态。更多还原

【Abstract】 To overcome difficulties of structure mapping in low-amplitude and deep or ultra deep structural area,this paper proposes a tomographic variable-velocity structure mapping method.Combining geologic,seismic,and log data,this method is different from the existing variable-velocity structure mapping methods.Considering sedimentary basins as divided into threefold structure,viz.before forming period,forming period,and after forming period,3D seismic interpretation is performed on a few geological fields.Using sonic logging data with interval velocity,interval time difference,and its thickness,an interval velocity field is built.Isopach maps can be obtained by multiplying interval velocity field and its time difference.So stratigraphic structures can be mapped by combining different isopach maps.This method coincides with geologic theory,and also coincides with theory of seismic waves.Results obtained from the tomographic variable-velocity structure mapping method are closer the true geology.更多还原