The method of common reflection angle mi-gration(CRAM) is presented for imaging the organic reef geological body. The model analyzing shows that the CRAM has more advantages, such as amplitude retaining and high—resolution, than the Kirchhoff pre —stack depth migration,. Although the CRAM and Kirchhoff methods are both belonging to radial migration technology, the former is more fit for big dip angle reflection plane than the latter. In this paper, it indicates that tremendous changes of velocity have some effect on radial tracing and wave stabilization in CRAM by velocity modeling of the organic reef. Meanwhile, proper velocity smoothness can improve the imaging of complex geological body, and it also enhances the organic reef identification from the geological bodies.%针对生物礁滩地质体具有高速、侧翼边界陡的特点,提出应用共反射角偏移成像技术(CRAM)进行生物礁滩地质体的成像.模型分析表明,虽然CRAM与Kirchoff偏移均属于射线类偏移技术,但是与Kirchhoff叠前深度偏移技术相比较,考虑了多路径的CRAM具有适应大倾角反射面、高速层下反射界面的成像,振幅保真性好、分辨率高的优势.通过建立速度变化大的礁滩模型,证实速度的强烈变化影响射线追踪和波形的稳定性,适当的速度平滑可以改善CRAM技术对复杂地质体的成像质量,有助于提高礁滩复杂地质体的地震识别.
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