High-resolution sequence stratigraphy of the Chang-6₂ oil beds of the Upper Triassic Yanchang Formation in the Pingbei Oil Field,northern Shaanxi

The architectures of three types of the short-term base-level cycles in the Chang-6₂ oil beds of the Upper Triassic Yanchang Formation in the Pingbei Oil Field,northern Shaanxi are described in detail. The high-resolution sequence stratigraphic division and correlation result in the construction of the isochronous stratigraphic framework,and the examination of the depositional evolution,sedimentary facies sequences,and spatial distribution of sandstones in the study area.