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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。
Based on the analysis of the speed change map and the exploration practice in the study area, aiming at the actual geologic features and structural features of the area, a set of methods for velocity mapping of the complex tectonic zone in the foreland belt was developed. The superposition velocity spectrum data was used to establish Initial velocity field; using adjacent well statistics, the average formation velocity and virtual multi-well location in the large section of the area are established to calibrate the initial velocity field and improve the velocity accuracy; and then the combination of horizon and drilling is used to carry out horizontal velocity cross-section, Vertical restraint, improve horizontal and vertical rationality. Which effectively improves the accuracy of speed field establishment and speed change mapping, and solves the structural mapping problem in the study area.