纵波和转换波联合反演技术在松辽盆地北部LMD地区的应用

常规纵波反演技术基于纵波地震资料，反演结果具有多解性。纵波和转换波联合反演技术基于纵波和转换波地震资料，由于增加了转换波地震资料这一约束条件，大大降低了反演结果的多解性，从而提高了储层预测的精度。纵波和转换波联合反演方法的基本原理是，通过建立纵波和转换波的反射系数线性方程，基于三维三分量地震资料，计算地层的纵波阻抗、横波阻抗和密度的反射率。首先基于正演模型，讨论了反演方法的精度；然后基于松辽盆地北部LMD地区的三维三分量地震资料，针对某气顶型油藏进行了反演，反演结果与实际地质特征吻合。

Application of P-wave and PS-wave jointed inversion in LMD area of northern Songliao Basin

Conventional P-wave inversion is based on PP-wave seismic data,maybe have multi solutions.P-wave and PS-wave jointed inversion is based on PP-wave and PS-wave seismic data,which largely reduces the multi-solution because of the constraint of PS data,and eventually improves the precision of reservoir prediction.The basic principles of P-wave and PS-wave jointed inversion is,by building reflectivity linear equation of P-wave and S-wave,P-wave impedance,S-wave impedance and density reflectance can be computed based on 3D3C data.Firstly,the precision of inversion is discussed based on the forward modeling.Then,the jointed inversion is carried out on the gas-cap reservoir based on 3D3C seismic data in LMD area of northern Songliao Basin.The inversion result is consistent with the reservoir geologic characteristics.