t-p域求取层速度

ESTIMATING INTERVAL VELOCITY IN TAU-P DOMAIN

1. 上海同济大学,上海200092;2. 地矿部石油物探研究所,南京210014

1. Shanghai Tongji University. Shanghai 200092;2. The Research Institute of Geophysical Prospecting for Petroleum, MGMR, Nangj ing 210014

层速度是地震勘探的一个重要参数.随着油气勘探工作的深入和发展.对勘探精度的要求也愈来愈高,常规的x-t域求取层速度的方法已难以满足要求.利用t-p域中反射波和折射波位于同一椭圆之上的特征来估算层速度,可以同时利用反射波和折射波的速度信息,从而提高了层速度求取的精度及可靠性,而且这种方法更适用于扩展排列的资料.本文对t-p域求取展速度方法的特点和技术细节作了详细讨论,并在理论记录及实际资料试验中取得了较好的效果.

The interval velocity is an important parameter in seismic exploration. Highly accurate seismic surveys demand for the support from homologous accurate interval velocities that conventional X-T domain techniques fail to provide. The fact that a reflection and a refraction coming from the same horizon after transform will lie on the same ellipse in Tau-P Domain allow us to use both of them in estimating interval velocities with accuracy. Besides, such a method is further suitable for extended spread's data.This paper will detail how interval velosities are derived in Tau-P Domain and present satisfactory results achieved in the practice of applying the method to both synthetic and real data.