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×××盆地西北边缘平均速度和有效速度的变化很大,沿倾向7公里的剖面上,t_0=2.0秒的有效速度变化达400米/秒;沿走向,相距5公里左右的两条测井曲线,2.0秒的速度差也达到140米秒。因此,过去一直用变速直射线法进行解释。今年,工区处于狭长的断裂带上。除经常出现大倾角反射、波的中断以外,还有绕射波、回转波等异常波。为保证解释精度,采用了变速曲射线法进行地质解释。
The average velocity and effective velocity of the northwestern margin of the ××× basin vary widely. The effective velocity of t_0 = 2.0 seconds varies up to 400 m / s along the 7 km profile. Two logs along the strike and about 5 km apart Curve, 2.0 seconds speed difference also reached 140 m seconds. Therefore, in the past has been to explain using variable speed direct ray method. This year, the work area is on a long, narrow fault zone. In addition to the recurrence of large dip angle reflection, the wave of interruption, there are diffracted waves, rotating waves and other anomalous waves. In order to ensure the accuracy of interpretation, a geospatial interpretation was made using the variable speed curve method.