采空区地震波场的正演模拟

Forward Modeling on Seismic Wave Field of Goaf

采空区与未采煤层以及煤层顶底板以及围岩具有一定规模的波阻抗差异,这一差异会在地震波场中引起响应,可以通过识别这一地震响应来判别圈定采空区的边界及其分布范围。利用Tesseral2—D软件包对各种类型和规模的采空区进行正演模拟,对得到的采空区地震波场响应特征进行分析,进而得出理论上地震勘探识别采空区的最小宽度和最小厚度。

There is a certain scale of wave impedance difference between goal and unexcavated coal layers, roof and floor rocks, as well as wall rock, which would cause response in seismic wave field. We can detect the goal boundary and its distribution by identifying the response. The paper got the forward modeling of various types and sizes of goal by Tesseral 2--D software, analyzed the seismic wave field response characteristics, and moreover, obtained minimum width and minimum thickness of goal recognized by seismic wave in theory.