Abstract: The architectural element analysis is applied to the reservoir architectures of the Triassic Lower Oil Measures in the first district of the Tahe Oil Field, Tarim Basin, Xinjiang. Twelve types of lithofacies are distinguished in terms of core examination. Seven orders of bounding surfaces are divided in the light of cores, well-tie section and well logs. Seven types of architectural elements are recognized, including channel lag deposits (CHL), channel filling (CH), longitudinal sandbar (LB), transverse sandbar (TB), fall-silt seam (FS), overbank fines (OF) and flood plain fines (FF). The planar model of the reservoir sandstones exhibits channel filling- and sandbar-dominated architectural elements.