页岩气地震探测采集方法研究

Study on Seismic Detection and Acquisition Method of Shale Gas

本文通过页岩气地震采集条件的分析,导出了页岩气地震采集的地震响应关系式;通过页岩气地震采集激发深度与反射波能量的关系分析及页岩气因地表产生的次生波对激发能量叠加效应和对上行反射波的作用分析,提出了利用调谐效应的激发深度确定方法;通过不同炸药量的深浅层能量分析得到浅层饱和炸药量约为10 kg。实例研究表明,页岩气地震采集得到的时间剖面上在6 s时间范围内,获得了六组以上信噪比较高、连续性较好的地震反射波组。

In this paper, through the analysis of shale gas seismic acquisition conditions, relationship between the response of seismic acquisition of shale gas is derived by seismic secondary wave; shale gas seismic acquisition and reflection wave excitation depth analysis of the relationship between energy and shale gas generated by the surface of the excitation energy superposition effect contribution to reflection, a method is proposed to determine the use of excitation depth tuning effect; by the amount of explosive energy in different depth layer analysis of shallow saturated explosive quantity is about 10 kg. The case study shows that six sets of seismic reflection wave groups with higher signal-to-noise ratio and better continuity have been obtained in the time range of 6 s in the shale gas seismic acquisition.