高陡复杂区速度研究及应用

本文以准噶尔盆地南缘GMD地区的资料为例，阐述了时深转换速度场的建立过程。首先通过拉格朗日公式对叠加速度进行编辑(基准面的校正、异常值的剔除、叠加速度的加密内插)，然后将叠加速度进行倾角校正转换成均方根速度，再由迪克斯公式换算为层速度，随后对每条线的层速度剖面进行内插得到速度场，最后利用该速度场进行时深转换，从而校正了同相轴的畸变，得到地下准确的构造形态。通过实际应用表明，本文提出的求取速度场方法是合理的。值得提及的是在对速度场平面插值时，除用井约束外，还必须考虑构造的变化情况，才能获得更为准确的速度场。

Study of velocity in highly steep complex area and application.

Taking the data in GMD area of south margin of Djungar Basin as an example,the paper expounded the building process of time-depth conversion velocity field.First,the stack velocities are edited by using Lagrangian (datum correction, elimination of anomalous values and increase and interpolation of stack velocity),then,the stack velocities are converted to root-mean-square (rms) velocities by using dip moveout and again are converted to interval velocities by Dix formula.Next,the velocity field is gained by interpolation of interval velocity sections for each line and finally using the velocity field to make time-depth conversion,that corrected the distortion of events,resulted in underground accurate structural configuration.The practical application of the method showed that the method of computing the velocity field presented in the paper is reasonable.It's worth mentioning when the interpolation of velocity field is implemented,the change of structures must be considered besides using logging data for constraint,that can gain more accurate velocity field.