The Triassic Halahatang Formation in the Tahe Oilfield, Tarim Basin, records a complex transition from fluvial to lacustrine depositional systems, yet its depositional architecture, evolutionary process, and controlling mechanisms remain insufficiently constrained. In this study, core observations, thin-section analysis, well-log interpretation, seismic attributes, heavy-mineral assemblages, palynological data, paleotopographic restoration, and sequence stratigraphic analysis were integrated to clarify sedimentary facies types, provenance directions, sandbody stacking patterns, and depositional evolution. The study area developed braided river, meandering river, and shore–shallow lacustrin... More >