<span>Identification of sandstone resevoir saturated by oil has been conducted by mean low <span>frequency and amplitude versus offset (AVO) analysis. Low Frequency analysis was has been <span>conducted among 3D and 2D seismic data of PSTM gather using continuose wavelet transform <span>(CWT) around 15hz. Low frequency analysis was done by calculating attribute gradient time <span>frequency of instantaneous amplitude using continuous wavelet transform (CWT) around <span>15hz for detecting the existing diffusive wave from reflection seismic. Diffusive wave is a <span>wave that appears due to fluid movement in porous rock, especially fluid of hydrocarbon with <span>certain viscosity and permeability. While amplitude versus offset (AVO) analysis was done <span>for detecting the impedance character of sandstone reservoir that related to porous rock. <span>Amplitude versus offset (AVO) analysis was done by calculating gradient*intercept and <span>observing the curve of wave reflectivity as a function of offset. The positive value of <span>gradient*intercept and curve of reflectivity as a function of offset could be identified as AVO<br /><span>class III and correlated to sandstone reservoir with low impedance and good porosity.</span></span></span></span></span></span></span></span></span></span></span></span><br /></span>