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复杂构造地区速度场的建立对于准确进行时深转换十分重要,过去由于方法较为单一,影响了构造解释的精度及勘探成功率。为此,提出了利用高精度卫星照片结合地震相沉积相分析、有井约束反演、叠加速度谱分析、井资料分析等多信息对复杂构造地区速度场进行综合建模的方法技术。通过对各种信息统一校正及塔里木盆地库车坳陷中部砾石层及巨厚盐体的速度变化规律的分析,精细建立了各控制层的速度场,进而消除了地震剖面中时间域里的伪构造,在塔里木盆地库车坳陷取得了良好的勘探效果。
The establishment of velocity field in complex tectonic regions is very important for accurate time-to-depth conversion. In the past, due to the relatively simple method, the accuracy of tectonic interpretation and exploration success rate were affected. For this reason, the method and technique for comprehensively modeling the velocity field in complex tectonic regions by using multi-information such as high-precision satellite photographs combined with seismic facies sedimentary facies analysis, well constraint inversion, superposition velocity spectrum analysis and well data analysis are proposed. Through the uniform correction of various kinds of information and the analysis of the velocity variation of gravel layers and thick salt bodies in the middle of the Kuqa Depression of Tarim Basin, the velocity fields of each control layer are finely set up so as to eliminate the falsehood in the time domain of seismic sections Structure, and achieved good exploration results in the Kuqa depression of the Tarim Basin.