【摘要】 对于转换波地震勘探中的转换点位置这个重要问题,提出转换点位置不仅与纵横波速度比,偏移距深度比以及源检距有关,还与地下介质的各向异性的性质有关,计算了忽略地下介质的各向异性影响对转换点的确定带来的严重误差,从而影响地下地质体的精确成像.通过对层状VTI介质中的转换点近似方程的推导过程,引入该方程不同于传统方程的导出是对层状各向同性介质而言,该方程通过引入各向异性参数,使我们对转换波可以有进一步的认识,拓展了转换波处理中各向异性的应用.该方程对于偏移距深度比小于3.0的情况是比较准确的,这对于大偏移距转换波勘探具有实际意义.更多还原

【Abstract】 The paper shows anisotropy effect on the conversion position and evaluate the error introduced in data processing due to neglecting anisotropy.It is demonstrated that the location of the conversion point depends strongly on elastic properties of the media.The paper introduces also the improved equations for calculating the conversion point of the P-SV converted wave(C-wave) in VTI media.The introduced equations for the conversion point are valid for offset about three-times the reflector depth.The equation reveal some addition analytical insights into the converted wave properties.更多还原