Abstract：The 438 B block of Algeria OUED MYA oil-bearing basin is characterized by deeper and low-amplitude structural-lithologic composite oil/gas reservoir.In order to regain oil and gas and improve reserve and production in the block and in view of the data characters of low seismic data resolution and lower S/N ratio,the paper integrative usage of such seismic attributes as amplitude,phase and frequency to interpret strata and fault,carry out variable velocity mapping on the basis of velocity analysis;define low-amplitude structure and clarify the distribution law of structural belt.At the same time,Using wave impedance inversion,spectrum decomposition,hydrocarbon detection and other attributes detective and analytic techniques to study the possible distribution range of reservoir and oil/gas,achieving good results.The high-productive oil-gas stream has been acquired in first drilling,opening up the phase of exploration in the range.
