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胜利油田垦71地区多分量地震资料采用微型三分量数字检波器采集,该区上覆地层为砂岩和页岩交互层。由于转换波传播路径的非对称性和各向异性等因素的影响,造成了转换波资料中同相轴的非双曲现象。利用传统的基于各向同性理论进行速度分析,动校正时无法把同相轴拉平。本文使用转换波四参数理论估算非双曲效应,进行转换波速度分析和数据处理。这四个参数包括转换波叠加速度(VC2)、垂直速度比(y0)、等效速度比(yeff)和转换波各向异性系数(xeff)。此方法利用不同偏移距的动校正信息来估算不同的参数,确保了同相轴的同相叠加。将该方法应用于胜利油田垦71地区数字检波器三维转换波资料的处理中取得了较好的应用效果,提高了转换波资料的成像质量,改善了纵波一转换波的对层分析。
Multi-component seismic data from Ken 71 area of Shengli Oilfield were collected using a miniature three-component digital geophone. The overlying strata in this area were sandstone and shale interaction layers. Due to the asymmetry and anisotropy of the converted wave propagation path, the non-hyperbolic phenomenon of the events in the converted wave data is caused. Using traditional isotropy-based theory for velocity analysis, it is impossible to smooth out the in-phase events during dynamic correction. In this paper, the non-hyperbolic effect is estimated by using the four-parameter converted wave theory, and the velocity of converted wave is analyzed and the data is processed. These four parameters include converted wave superposition velocity (VC2), vertical velocity ratio (y0), equivalent velocity ratio (yeff) and converted wave anisotropy coefficient (xeff). This method uses the dynamic correction information of different offsets to estimate different parameters and ensures the in-phase stacking of the events. The method has been applied to the processing of three-dimensional converted wave data of digital geophones in Ken 71 area of Shengli Oilfield. The improved method has improved the imaging quality of converted wave data and improved the paired layer analysis of a converted longitudinal wave.