Abstract: T₈ reflection wave group (Paleogene) is one of the most noteble and stable seismic reflection sequences in Serikbuya area of Tarim basin, which includes three types of seismic facies: high-amplitude, highly continuous, polyphases; high-amplitude, highly continuous, dual phases, and moderate-amplitude, moderately continuous, thinning out, indicating the sedimentary dominated by lagoonal gypsum and gypsiferous mudstone, and normal marine limestone probably developed in southwestern part of Serikbuya. In accordance with the appearance, seismic anomaly reflection of T₈ wave group can be divided into hummocky, lenticular and bank anomalous body attributed to paleogeomorphology response, lithological response and fault response. T₈ sequence is believed to have no reservoir available, but it can be a good areal caprock.

Key words: Tarim basin, Serikbuya area, Paleogene, Formation, T₈ reflection wave group, Seismic anomaly, Paleotopography, Gypsum