Bentheimer sandstone segmentation with multiple clay phases in different micro-porosity. Phase 0: macro-pore space; phase 1: clay with micro-porosity 0.3; phase 2: quartz; phase 3: feldspar; phase 4: high-density mineral; phase 5: clay with micro-porosity 0.4; phase 6: clay with micro-porosity 0.5; phase 7: clay with micro-porosity 0.6. Image size: 800*800*800 voxel. Resolution: 2.15 um/voxel.
