中文摘要：

提出了一种利用三维激光扫描和气体置换法测定岩石有效孔隙率的方法。通过三维激光扫描获取岩心总体积，并运用氦气置换法求取岩心有效孔隙率。实验表明，三维激光扫描计算体积较默认计算体积更为精确，体积测量可降低3．92％的误差；扫描体积及表面积随着扫描分辨率的增大而增大；该方法计算得出有效孔隙率较采用默认体积计算值更接近实际一隋况，针对砂岩样品可降低误差16．5503％和43．2326％。

英文摘要：

The effective porosity has an important significance for the study of porous media liquid. There- fore, in order to determinate it, it is particularly important to explore new accurate methods. An approach of calculating effective porosity by the combination of three-dimensional laser scanning and gas displace- ment method （3DLS-GD） was proposed in this research. The volume of the core can be obtained through 3DLS, and the effective porosity can be acquired by utilizing Helium displacement method. Experiments show that volume calculated by 3DLS is more accurate than the default volume, and it can reduce the error of 3.92%. Scanned volume and surface area increase with the enlargement of the scanning resolution. The effective porosity calculated by 3DLS-GD method is closer to the actual situation than the results calculated by default volume, and it can reduce the error of 16. 550 3%,43. 232 6% in sand samples.