Three resistivitycurves obtained at deep, middle, and shallow depth of investigation are notoverlapped with each other, and porosity indicated by AC, CNL, and DEN is low.

• 砂岩的自然电位为负异常,自然伽马为低值,电阻率较低,深、中、浅三条电阻率曲线不重叠,声波时差、中子和密度曲线反映孔隙度偏低。