摘要
在转换波地震勘探中要兼顾P波及P—SV波剖面,关键在于准确合理地选择P—SV转换波的偏移距。根据淮南某煤田的钻孔和测井资料,设计了一个具有四层介质的地质模型,针对该地质模型参数,采用反射系数和弹性波交错网格高阶有限差分两种方法对转换波偏移距进行了定量研究。通过理论计算及与实际资料对比。确定煤层转换横波能量主要集中在0.2H～1.3H之间(H为目的层深度),据此即可确定煤田多波地震勘探P—SV波偏移距范围。
In transformed wave seismic prospecting, people have to give attention both to P wave and SV wave sections, accurately and rationally select offsets of P-SV transformed waves are the key points. On the basis of drilling hole and well logging data from one coalfield in Huainan, we designed a geologic model that is provided with four layers of medium. In allusion to parameters of the model, made quantitative study on transformed wave offsets by introducing two methods of reflectance and elastic wave staggered grid high-order finite differencing. Through theoretical calculation and actual data comparison, made sure that coal seam transformed shear wave energy is mainly concentrated between 0.2H～1.3H (H is the depth of target stratum), then the P-SV wave offset range in coalfield multiwave seismic prospecting can be set on.
出处
《中国煤田地质》
2005年第2期43-45,55,共4页
Coal Geology of China
关键词
地震勘探
煤层转换波
偏移距
反射系数
seismic prospecting
coal seam transformed wave
offset
reflectance
