山前复杂构造带变速成图速度研究

通过对变速成图中速度进行分析，结合研究区勘探实践，针对该地区的实际地质特点及构造特点，研究出一套针对山前带复杂构造区变速成图的方法：应用叠加速度谱资料建立初步速度场；利用临近井统计，建立区域大层段的地层平均速度，虚拟多口井位，进行初步速度场的校正，提高速度精度；再利用层位、钻井的结合，进行速度场横、纵向约束，提高横、纵向的合理性。有效地提高了速度场建立和变速成图的精度，解决了研究区构造成图问题。

The Study of Varying--velocity Mapping in Complex Structural Region in Front--zone of Mountains

Based on analyzing the speed of varying velocity mapping and combined with the actual geological and the structural features of the study area, a method on the varying-- velocity mapping of the complex structure region in the front--zone of mountains is stud- ied. The stack velocity spectrum is applied to setting up the initial velocity field and the ad- jacent well statistics is used to set up the stratum average velocity of the reginal big layer and the virtual multi--wells. The correction of velocity field is preliminarily made to im- prove the velocity accuracy. Then the layer and drilling are combined to restrain horizontal and vertical of the velocity field, which efficiently improves the establishment of the veloci- ty field and the accuracy of the varying--velocity mapping and solves the problem of struc- tural mapping of the study area.