基于AVA道集的井间地震上行反射P波分离方法的研究与应用

Study and application of up-going P-wave extraction method based on AVA gather of crosswell seismic data

（中国石油化工股份有限公司胜利油田分公司物探研究院,山东东营257022）

Geophysical Research Institute of Shengli Oilfield,Dongying 257022,China

针对井间地震资料处理中现有上行反射P波提取方法的不足，提出了基于AVA道集的三分量井间地震资料上行反射P波分离方法。首先对水平分量X和Y的直达波场进行水平定位,旋转得到两井平面内的径向分量R,然后对垂直分量Z和径向分量R进行直达波去除、管波衰减和上行波场分离,利用直达波层析反演结果建立速度模型,对垂直分量Z和径向分量R的上行波场分别进行上行反射P波射线追踪,得到两个相应的AVA道集,根据上行反射P波的入射角大小进行上行反射P波分离和提取,最后完成上行反射P波的叠加成像。模型计算和实际资料的处理结果表明,该方法可以有效提取三分量资料的上行反射P波能量,保证了上行反射P波叠加成像的精度和保真度。

In order to effectively separate and extract up-going reflected P-wave in crosswell seismic data,a new method was presented.Firstly,the radial component R in the plane of the two wells was obtained by horizontally orientating and rotating the first arrival of X and Y component.Secondly,direct wave removal,tubing wave attenuation and upgoing wave separation were implemented on vertical Z component and radial R component.Thirdly,the direct wave tomography inversion result was used to build velocity model.Up-going reflected P-wave tracing was carried out on the up-going wave field of vertical Z component and radial R component,and two corresponding AVA gathers were obtained.Finally,the separation and extraction of up-going reflected P-wave was proceeded in terms of its incident angle.the up-going reflected P-wave was stacked and imaged.Model computation and actual data processing results indicated that the method can effectively extract the up-going reflected P-wave in three-component data,which ensured the accuracy and fidelity of stack imaging of up-going reflected P-wave.