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傅旦丹,何樵登:地震折射偏移,《石油地球物理勘探》,23(4)1988:460～467由折射初至精确地反演近地表表层结构,一直是折射解释和折射静校正工作的重要内容。本文提出一种能快速准确地给出折射界面的方法:首先在每一炮点处求得临界距离值及从炮点到临界点的旅行时;然后根据该旅行时用椭圆法来构制折射界面。该方法可利用多次覆盖资料,在只知道上层速度而不知道折射速度的情况下,能准确地给出折射界面的位置,能适应界面剧烈起伏和折射速度有横向变化的情况,并能顺利地求取准确的折射速度值。
Fu Dan Dan, He Qiaodeng: Seismic Refraction Offsets, Geophysical Prospecting, 23 (4) 1988: 460-467 Accurate inversion of near-surface skins from refracted first arrivals has been a matter of refraction interpretation and refraction statics Important part of work. This paper presents a fast and accurate method to give the refractive interface: first at each shot point to find the critical distance and travel from the shot point to the critical point of travel time; and then based on the travel elliptical method to construct refraction interface. The method can cover the data by multiple times. When the speed of the upper layer is known without knowing the refraction speed, the method can accurately give the position of the refraction interface and can adapt to the situation that the interface fluctuates sharply and the lateral speed of the refraction speed changes smoothly, Find the exact refraction speed value.