水利工程坝址的选取不仅关系着安全性，也影响着后期的投入使用以及稳定运行。通常坝址区选择需要对区域的速度和岩性进行分析，其中高精度的速度建模至关重要。针对水利坝址选取，提出了一种地震信息约束的地质统计学建模方法对坝址区进行高精度速度建模，在此基础上分析坝址选取的安全性及合理性。通过地质统计学理论，分析坝址区速度的区域变异性，利用地震层位的横向信息以及测井资料的纵向信息联合进行序贯高斯模拟，从而建立速度模型，建模结果更加符合实际情况，能有效反映速度的空间分布情况。最后通过建立的速度模型合成地震记录，与实际地震记录相对比，吻合程度较高，表明建立的模型能反映坝址区的速度分布情况，能基于此圈定出有利于修建坝址的区域，验证了方法的可行性。

The selection of dam site of water conservancy project is not only related to safety, but also affects the later use and stable operation. The analysis of regional velocity and lithology is usually required in the process of selection, where high-precision velocity modeling is critical. Aiming at the selection of water conservancy dam site, a kind of geostatistical modeling method constrained by seismic information was proposed to model the high-precision velocity of dam site area. On this basis, the safety and rationality of dam site selection were analyzed. Through the theory of geostatistics, the regional variability of velocity in dam site area was analyzed, and the sequential gaussian simulation was carried out by using the lateral information of seismic horizon and the longitudinal information of logging data, then the velocity model was established. The modeling results were more in line with the actual situation and can effectively reflect the spatial distribution of velocity. Finally, the seismic records were synthesized by the established velocity model, which was in good agreement with the actual seismic records. The results show that the established model can reflect the velocity distribution of the dam site area, and the area conducive to the construction of the dam site can be delineated based on method of this paper, which verifies the feasibility of this method.