【摘要】 叠前地震资料含有地层的纵波、横波速度和密度等信息。利用叠前反演获得隐藏在地震数据中的这些基本参数后,即可揭示大量岩性及孔隙流体性质的信息。这里推导了平面波在层状弹性介质中传播的正演算子,提出了一种基于Brent正交搜索方向组的叠前三参数反演方法,该方法不需要求解庞大而复杂的导数矩阵。通过自适应退火因子和罚函数来处理约束条件,提高了算法的稳定性。将K-L变换引入到方向置换过程,有效防止了搜索方向组的线性相关。经理论模型和油田实际数据的反演结果表明,该反演方法是一种利用叠前地震数据进行储层预测的有效手段。更多还原

【Abstract】 Prestack seismic data contains the P-wave,S-wave velocity and density information of subsurface stratigraphy.If these parameters can be acquired from seismic data by prestack inversion,plenty of lithology and pore fluid information can be revealed.This paper derived the forward operator,which is generated by the plane wave propagation in stratified elastic media.A prestack three-term inversion method which is based on Brent algorithm is then proposed.This method did not need to compute the sophisticate first order and second order derivative matrix.By dealing the constraint conditions with adaptive annealing factor and penalty function,the inversion stability is improved.By introducing K-L transform in the direction substitution,the linear dependence of searching directions is effectively prevented.Application results in synthetic and real oil field data proved that this method is effective in reservoir prediction with prestack seismic data.更多还原