The accuracy evaluation on 3D digital cores reconstructed by sequence indicator simulation
The accuracy evaluation on 3D digital cores reconstructed by sequence indicator simulation
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作者：
Huawei Yu
X射线计算机断层扫描（CT）的成本高，耗时长获得真实的三维数字岩心，以代表岩石的真实微观结构。基于岩石的二维图像重建三维数字岩心并评价重建的数字岩心的准确性非常重要。在岩石二维图像的基础上，利用序列指示模拟重建了三维数字岩心。孔隙大小分布函数，计算了真实的三维数字岩心和重建的数字岩心的局部孔隙度分布函数和平均逾渗概率函数，并用有限元方法模拟了三维数字岩心的体积模量和地层因素，将重建的数字岩心与真实的数字岩心获得的参数进行比较，表明重建的数字岩心与真实的数字岩心相似数字岩心在孔隙度、变差函数、均匀性等方面与真实数字岩心基本一致，重建后的数字岩心平均孔隙度较小，连通性较差。
It is too expensive and has more time consuming by using X-ray computerized tomography(CT) to obtain the real 3D digital cores for representing the true microstructures of rocks.It is important to reconstruct 3D digital cores based on 2D images of rocks and evaluate the accuracy of reconstructed digital cores.The 3D digital cores were reconstructed using sequence indicator simulation on the basis of 2D images of rocks.The pore size distribution function,local porosity distribution function and average percolation probability function were calculated in the real 3D digital cores and the reconstructed digital cores.The bulk modulus and formation factors of those 3D digital cores were simulated by finite element method.The comparison of the parameters obtained from the reconstructed digital core with those from the true digital core indicates that the reconstructed digital core is similar to the true digital core in porosity,variogram function and homogeneity.The reconstructed digital core has smaller average pore size and worse connectivity than the true one.