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准噶尔盆地南缘山前复杂构造带推覆构造发育,由于推覆构造上盘速度较高,上覆地质结构又比较复杂,造成推覆断面及下伏构造的地震成像效果普遍比较差。根据波动方程地震波照明结果,利用照明统计法确定了针对某勘探目的层的地面最优炮点加密范围;利用射线追踪和波动方程模拟联合照明,综合分析了地下各目的层上覆盖次数和能量的贡献分布曲线,确定了针对这些目的层的最优检波器排列方式和排列长度。应用结果表明,整个地震剖面成像质量有了较大的提高,推覆面下隐伏构造形态完整,成像效果好。
Due to the development of the nappe structure in the complex front of the piedmont in the southern margin of Junggar Basin, the overburden geological structure is relatively complicated because of the high hanging wall velocity of the nappe structure and the seismic imaging effect of the nappe and the underlying structures. According to the result of seismic wave illumination of wave equation, the optimal range of ground-based shots of the ground for an exploration target layer is determined by the illumination statistics method. The ray tracing and wave equation are used to simulate the combined illumination, and the coverage times and energies Contribution distribution curves determine the optimal detector arrangement and permutation length for these layers. The application results show that the imaging quality of the whole seismic profile has been greatly improved, and the concealed tectonic configuration under thrust surface is complete and the imaging effect is good.