For sandstone reservoir, the acousticimpedance of gas-bearing sandstone is lower than that of oil - and water-bearing sandstone, gas in reservoir may be directly recognized by using this difference.
对于砂岩储层，含气砂岩的声阻抗比含油和含水砂岩的声阻抗低，利用这种差异可以直接识别储层中气体。
2
The proposed finite difference boundary condition expands the scope of application of FDTD to scattering problems of objects with a finite acousticimpedance but without tangential stress.