关于浮动基准面概念的讨论

Discussion to the concept of the floating datum

1. 中国石化石油勘探开发研究院南京石油物探研究所,江苏南京 210014;2. 四川石油管理局地质调查处地震四大队,重庆永川 402160

Institute of Geophysical Prospecting, SINOPEC Research Institute of Petroleum Exploration and Development, Nanjing 210014, China

浮动基准面方法是将相对固定基准面的一份静校正量分解成两部分,并分别在动校正前、后应用的一种处理手段,这种分解是以CMP道集为单位的。实际上浮动基准面还是水平基准面,只是不同CMP的水平基准面高程可以变化。进行了浮动基准面概念的讨论,指出了对浮动基准面概念的误解,并用理论模型说明了采用错误浮动基准面概念对速度分析和叠加结果的影响。

Floating datum method is divide the static of relative fixed datum into two parts that are applied to seismic data before and after NMO respectively and the division is done on CMP gather. Actually, floating datum is still horizontal datum, but the datum elevation of different CMP is variable. It is clarified the conception of floating datum about the misunderstanding and discussed the concept. An example of simple theoretic model is used to explain the negative effect on velocity analysis and stack result by the mistake floating datum conception.