地层倾角约束自适应孔径叠前时间偏移

Adaptive aperture prestack time migration with dip constrain

本文在地震层位解释的基础上,采用自动倾角扫描,确定成像点的地层倾角,然后根据成像点所在的地层法线确定其对应的偏移孔径范围。若地下某一点所在的地层倾角不同则确定的偏移孔径也不同,从而既保证了有足够大的偏移孔径使倾斜地层成像,又避免了偏移孔径过大造成的偏移噪声。应用本文方法在土库曼斯坦阿姆河右岸地区对碳酸盐岩复杂构造成像取得了满意的结果,说明该方法具有广阔的应用前景。

We propose in this paper an adaptive aperture prestack time migration approach with dip constrains.Based on seismic horizon interpretation,automatic dip scanning can determine the dip in imaging point.Then its offset scope of the corresponding imaging point can be determined by the normal line.If a point where the underground strata dip is different,the aperture is different.Thus the offset aperture is large enough for inclined strata imaging,and excessive noise cannot be caused by the exaggerate aperture.It is satisfied in application of the proposed method to carbonate complex structure imaging in the region on the right bank of the Amu Darya in Turkmenistan,indicating that the method has broad application prospects.