层速度替换建场法在高陡构造区的应用

为了得到较好的成像效果,在山前高陡复杂构造区的地震资料处理中,一般采用叠加速度作为成像速度。但由于受高陡地层、膏盐岩塑性地层变形和地层逆掩推覆的影响,叠加速度并不能真实反映地下地层的速度变化规律,因此利用叠加速度资料、采用常规的速度建场方法难以准确落实构造。本文针对高陡复杂构造区的构造特点,结合多年山前复杂构造区的速度研究及建场经验,提出了适用于高陡复杂构造区速度研究思路及建场方法——高陡构造区层速度替换建场法。该方法在东秋里塔格构造带构造落实中应用效果较为明显,为东秋里塔格构造带的油气勘探提供了比较可靠的构造图。

Application of interval-velocity-replaced field-building method in high steep structural region.

In complex piedmont high steep structural regions, stack velocities are imaging velocities used to obtain better imaging results in seismic data processing, which can't reflect the velocity-variant law of underground horizons because of impact of deformation of plastic salt formation and over-thrusting formation. Therefore, using stack velocity data and ordinary velocity-field-building method are difficult to correctly determine the structures. In view of the feature of complex high steep structural region with many years' study of velocity and field-building experiments, the paper presented ve- locity-studied idea and field-building method suitable for complex high steep structural region-interval-velocity-replaced field-building method for complex high steep area. The method was used to determine structural belt and achieved good results, provided a reliable structural map for oil/gas exploration in East Qiulitage structural belt.