井源距VSP资料在煤层气勘探中的应用研究

对于非零井源距VSP三分量数据,通过旋转和域变换进行波场分离、拾取初至旅行时反演地层层速度、利用基于Fermat原理的射线追踪算法进行深度域纵横波成像、综合利用地震波的运动学和动力学特征估算吸收系数等手段,在山西某井区非零井源距VSP数据处理过程中对储层进行更深入和精细的研究和解释,取得了良好的效果。 

Application study of 3-C offset VSP data in coalbed gas exploration

Using 3 C offset VSP data,many results can be achieved by using following techniques.The techniques include 3 C rotation,wave field separation with domain transform,interval velocity inversion with picked first break,VSP wave depth imaging with ray tracing algorithm,which is based on Fermat's principle and absorption coefficient estimated with combination of seismological kinematic and dynamic properties.The techniques have been successfully applied to offset VSP data from an area in Shanxi and good processing results have been obtained.These results show that it is helpful to make full use of the data extracted from VSP wave field for detailed reservoir study and interpretation.