黄土塬梁峁区三维地震采集方法研究

A Research on 3D Seismic Acquisition Method in Loess Tableland,Ridge and Hill Areas

针对黄土塬梁峁区复杂地形及特殊的浅层地震地质条件,以鄂尔多斯盆地南缘陇东黄土高原彬长矿区DFS煤矿首采区为研究区,提出了一种规则束状接收不规则沟中激发的三维地震采集方法。即依据区内地震地质模型,按照三维地震观测系统设计原则,使用地震采集软件进行人机对话,并通过映像区分析等手段,考察炮点、检波点设计和修改时对反射区的影响程度,来确定最佳的炮检点分布。DFS煤矿首采区的三维地震勘探成果表明,该方法得到的三维地震数据体信噪比较高,其解释的地质构造位置、规模准确,反映清晰。根据勘探成果,建议矿方修改工作面,经采掘验证真实可靠,可见规则束状接收不规则沟中激发是黄土塬梁峁区复杂地形条件下行之有效的勘探方法。

In light of special shallow seismic-geologic condition in loess tableland, ridge and hill complex topographic areas, the paper put forward an inerratic bunchy 3D seismic acquisition method to receive shot from irregular ditches in Binchang mining area DFS coalmine first winning district on the loess plateau at the eastern part of Gansu Province, south margin of the Ordos Basin. That is based on the area＇s seismic-geologic model, in accordance with 3D seismic design principle of field setup, carry out man-machine conversation through seismic acquisition software, by the use of reflection area analysis to check impact extent of shotpoint, geophone station design and adaptation to the reflection area and determine optimum distribution of source-detector points. The results of the area＇s 3D seismic prospecting have demonstrated that the method has higher 3D seismic data volume S/N ratio, clearer geological structure position and extent reflections. According to the prospecting results, working face modifications were advised and testified reliability after mining validation. It is obvious that the method is tried and true in the loess tableland, ridge and hill areas.