南马庄地区第三系地层埋藏深度较浅,且直接覆盖在下古生界灰岩(潜山)之上。由于潜山面上覆介质的速度是深度的线性函数,而潜山面以下(潜山内幕)介质的速度近于常数,所以对于潜山内幕的空校就不能沿用常规的空校方法。对于速度随深度呈线性变化的介质,射线是圆弧;对于速度是常数的均匀介质,射线是直线。因此,潜山内幕反射空校的关键是求反射点p的水平偏移距x_p和铅垂深度z_p。 The Tertiary strata in the Nanmazhuang area have a relatively shallow depth of burial and directly cover the Lower Paleozoic limestone (buried hills). Since the velocity of buried medium is a linear function of depth, and the velocity of buried medium below buried hill is nearly constant, the conventional air-to-air method can not be used for airborne underground buried hill. For media whose velocity varies linearly with depth, the ray is circular; for a uniform medium whose velocity is constant, the ray is a straight line. Therefore, the key to the internal reflection of airborne buried hills is to find the horizontal offset x_p of the reflection point p and the vertical depth z_p.