Research Article
Mechanical Properties and Microscopic Geological Features under Uniaxial Compression in Tight Reservoir
Figure 4
Element results of the sandstones from two different strata. Na: sodium; Mg: magnesium; Al: aluminum; Si: silicon; P: phosphorus; S: sulfur; K: potassium; Ca: calcium; Ti: titanium; Mn: manganese; Fe: ferrum.