高精度数值模拟多分量数据的采集

The acquisition of multi-component data by high-precision numerical simulation

多分量地震勘探常采用位移波场的接收方式,且多分量传感器位于同一个检波点位置处,而室内弹性波数值模拟通常观测的是速度形式的弹性波场,且各分量波场常采用交错网格的配置方式,为此,提出了在原有速度波场计算的基础上,采用积分法求取位移形式的多分量弹性波场,用节点平均法实现节点交错位置规则化的方法。数值实例表明,多分量位移波场和速度波场相差90°的相位移,且波场能量无损失,计算量较小,积分法可以更好地压制数值频散,节点平均法可以进一步平滑数值噪音,提高弹性波数值模拟记录的信噪比,因此,可以用于精确模拟多分量资料的室内数值采集并指导野外多分量地震勘探。

Multi-component seismic exploration usually us- es displacement wave field as receivers, and the multi-compo- nent sensor is arranged in the same points of the geophone, while that observed by the interior elastic wave numerical modeling is the elastic wave field with velocity form, and each component is arranged with staggered-grid form, therefore, the paper puts forward that using integration method to solve the multi-component elastic wave field with displacement form, and using node average method to achieve the regularization of the wave field points from originally staggered-grid arrangement on the basis of the original velocity wave field. The numerical example shows that the multi-component velocity wave field has 90 degree phase shift compared with displacement wave field, the wave field energy is not lost and the computational amount is little, the integration method can greatly suppress the numeri- cal dispersion and the node average method can further smooth the numerical noise, so the S/N ratio of the elastic wave numerical simulating records are improved, thus, the method can be used to accurately simulating the in-house nu- merical data acquisition and guiding the field multi-component seismic exploration.