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速度的精度直接影响地震解释结果与储层预测的可靠性,本文以原始速度谱为基础,经一系列校正、平滑、滤波,形成最终速度数据体。基本思路是:(1)以原始速谱数据为基础,对其进行剔除、中值滤波和平均值平滑,然后通过Dix公式或模型迭代反演求出地层层速度和平均速度;(2)求出井中速度与速度谱之间的系统偏差与校正系数,并对工区內所有速度谱进行校正,并与测量成果结合建立初始速度数据体;(3)应用趋势面分析对数据体进行平滑;(4)进行纵向插值与平面上网络化,形成最终速度数据体。
The accuracy of velocity directly affects the reliability of seismic interpretation results and reservoir prediction. Based on the original velocity spectrum, this paper is calibrated, smoothed and filtered to form the final velocity data body. The basic idea is: (1) Based on the original speed spectrum data, remove, median filter and average smooth, and then calculate the formation velocity and average velocity by Dix formula or model iterative inversion; (2) System deviation and correction coefficient between the velocity and velocity spectrum in the well, and calibrate all the velocity spectra in the work area, and establish the initial velocity data body in combination with the measurement results; (3) Apply the trend surface analysis to smooth the data body; ( 4) Longitudinal interpolation and network plane, the formation of the final speed data body.