正反向照明分析在高陡构造地震采集中的应用

Application of forward and reverse illumination analysis in seismic acquisition of high and steep structures

川东南地区的构造复杂区地震资料品质较差,下伏地层成像不理想,为了解决这一难题,我们依据以往资料构建了二维地质模型,在高陡构造区域进行模拟激发接收,开展波动方程照明,进行最大偏移距和激发位置范围优化。本文通过正向照明分析技术,论证最佳的最大炮检距长度,利用反向照明分析技术确定特定目标体的优势激发点位,优选激发范围。通过调整地质目标体的照明能量属性,分析照明效果,进一步优化了高陡构造区野外采集观测系统,改善了地震采集资料品质,提高了地质勘探效果。

In view of the poor quality of seismic data and unsatisfactory imaging of the underlying strata in the structurally complex areas in southeastern Sichuan,we constructed a two-dimensional geological model based on the previous data,and carried out simulated excitation and reception,wave equation illumination,and optimization of maximum offset and excitation location range in the high and steep structure area.In this paper,the forward illumination analysis is used to demonstrate the best length of the maximum excitation range,and the reverse illumination analysis is used to determine the dominant excitation point position of a specific target and optimize the excitation range.By adjusting the illumination energy attribute of the geological target body and analyzing the illumination effect,the field acquisition and observation system in the high and steep structure area has been further optimized,with the quality of seismic acquisition data being improved,and the geological exploration effect being enhanced.