In order to clarify the tuff reservoir properties in the Sha1 Member of Dehui fault depression,thin-section,s-ray diffraction analysis,physical properties and other data are used to study the microscopic properties of tuff reservoir.Combining with logging data,the intersection chart between GR-DEN,AC-DEN and Rt-AC curves are used to identify the tuff reservoir from the surrounding rock.Research indicates that the reservoir rock of Sha1 Member mainly consists of crystal tuff,vitreous-crystal tuff and tuff sa...