Micro-anisotropic Experimental Analysis on Chang-8 Sandstone in Xifeng Area of Ordos Basin

Based on the micro-model experiments for authentic sandstone samples, the micro-anisotropic characteristics of Chang-8 sandstones from the reservoirs in Xifeng area of Ordos Basin was analyzed. The results show that Chang-8 reservoirs behmg to compact-type sandstone with intense miero-anisotropy. And the diagenesis and porous structure of the sandstones are the main factors leading to the mieroanisotropy of Chang-8 reservoirs. The low permeable sandstones result in the intense mieroanisotropy of Chang-8 sandstone and form the high permeable zone of Chang-8 reservoirs.