Abstract:Time-window fitting method is used to produce AVO attribute section (P and G sections ) by taking time-window amplitude sequences within CDP trace gathers. Compared with common fitting methods which use amplitude sequence at a single sample point,it has the following advantages·reducing the G-section false anomaly that is caused by nonuniform waveforms and out-phase of events within a CDP trace gathe·reducing the noise effect because of more fitting data and more obvious statistical meaning·AVO attribute section derived from time-window fitting method has continuous reflection legs,smooth waveforms and higher signaljnoise ratio.