高精度水域地震反射波法在厦门海域工程勘察中的应用

The Application of High Precison Marine Seismic Reflection Method to Exploration in Xiamen Marine Area

厦门海域存在风化槽、孤石、礁盘及隐伏断裂等不良地质现象,为探明厦门市地铁1号线、2号线及3号线工程跨海段工程地质条件,选用了高精度水域地震反射波法。本文介绍了地震反射CDP叠加技术与分辨率影响因素,阐述了高精度水域地震反射波法技术特征、震源选择、数据采集、数据处理等方面的相关技术;论述了厦门海域各种不良地质体在时间剖面上呈现出不同的异常特征。通过工程实例说明高精度水域地震反射波法在进行岩土层划分、风化槽、孤石、礁盘及隐伏断裂勘察时,均可取得较好的勘察效果。

With unfavorable geological conditions such as weathered ditch, boulder, reef and buried fault in Xiamen marine, high precison marine seismic reflection method is carried out to explore marine engineering geological condition in Xiamen MRT No. 1 to 3. This paper introduces the technologies of CDP stack and influence factor for resolution, expounds the character of high precision marine seismic reflection method, seismic source selection, data acquisition and data processing, and discusses the different abnormal characters in seismic time section under all kinds of unfavorable geology. The engineering application results show high precision marine seismic reflection is an effective method in exploration of strata classification, weathered ditch, reef, boulder and buried fault.