吐哈盆地前侏罗系二维地震勘探采集技术

2-D seismic acquisition for pre-Jurassic strata in Tuha basin

吐哈盆地二叠系、三叠系 (简称前侏罗系 )具有很大的资源潜力和广阔的勘探前景 ,但前侏罗系地层埋藏较深 ,加之受以往采集技术的限制 ,使地震剖面无法满足构造解释的要求。为此 ,对前侏罗系二维地震勘探采集难点进行了分析 ,并采用了用地质模型射线追踪优选观测系统 ,通过试验选择激发参数 ,在盒式排列干扰波调查的基础上选择接收参数等方法技术 ,在实际生产中取得了较好的效果 ,得到的新地震剖面与老剖面相比有质的飞跃 ,完全满足构造解释的要求。

The Permian and Triassic strata that are called pre-Jurassic collectively are promising prospects in Tuha basin. However, the deep depths of the strata and restrictions in data acquisition resulted in seismic data of poor quality. Based on an analysis of the difficulties in data acquisition, the author proposed a method of data acquisition. We optimized the seismic layout by ray tracing on geologic model, selected the shooting parameters by field tests, and determined the receiving parameters by a survey of interference waves in box array. The proposed method revolutionizes the seismic data, which are suitable for structural interpretation.