倾角时差校正在三维观测系统设计中的应用

Application of DMO analysis in 3-D geometry design

讨论了倾角时差(DMO)校正在三维观测系统优化设计中的应用。通过对三维观测系统某一面元内不同炮检距、不同深度和不同倾角地层进行倾角时差校正,可以得到加权DMO覆盖次数;利用倾角分解法对地下复杂地质构造的倾角进行分解,再根据偏移距和目的层深度,可以得到不同倾角地层的DMO脉冲响应。不同的观测系统对应不同的加权DMO覆盖次数和DMO脉冲响应,可以根据加权DMO覆盖次数的分布是否均匀, DMO脉冲响应是否有好的一致性,对三维观测系统进行评判。对某研究区的常规和高密度三维观测系统进行了DMO分析,结果表明,DMO校正对于判断观测系统压制采集脚印的能力以及进行观测系统设计优化很有帮助。

The application of DMO correction in 3-D geometry design was discussed.By DMO on the different offset,different depth and different dip at one common bin in 3-D geometry,we can get weighted DMO fold.Dip angle decomposition method is used to decompose the dip of subsurface complex geologic structures,and then DMO impulse response of the formations with different dip can be obtained by offset and interval depth.Different geometries have different weighted DMO fold and different DMO impulse response,so we can evaluate the 3-D geometry by the uniformity of distribution of weighted DMO fold and the consistency of DMO impulse response. DMO analysis was carried out on the conventional and high-density 3-D geometry of one area.The results show that DMO correction is helpful for judging the ability of geometry for suppressing acquisition footprint and optimizing geometry.