Abstract:

Standardization is important for the future research on sequence stratigraphy. The framework includes genetic modeling, establishing standardization and application of industrialization. The workflow emphasizes defining the genetic type of sedimentation and the bounding surfaces. Because of the complexity of continental sedimentation in China, gammaray apparatus, element capture device, GPR, element geochemistry and other methods could be used in the research on highresolution sequence classification, establishment of the sequence stratigraphic framework of outcropwellseismic, and identification of thirdorder bounding surfaces and flooding surfaces. The integrated research on highresolution sequence stratigraphy depended on quantitative expression of palaeobathymetry, paleoclimate and geochemistry in sedimentary cycles of continental lake basin. Using the technique in the sequencelithofacies paleographic research of the upper Triassic Xujiahe Formation in Sichuan Basin, the Xujiahe Formation could be divided into five thirdorder sequences. The second member of Xujiahe Formation was part of different system tracts with rising and falling basal level of two thirdorder sequences. The lower part of second member was defined as progressive delta and the upper part was regressive. The thickness and physical property of lower part reservoir is better, and pay formation is mainly in lower part, which is due to the different development mechanism of delta sandstones. Based on sequencepaleogeographic research, the second, fourth, and sixth member of the Xujiahe Formation are defined to be the main reservoir, and the interbedded mudstones could be the source rock. The first, third, and fifth member of the Xujiahe Formation are defined to be the main source rocks; the delta sandstone with lesser scale along basin margin is a significant reservoir too.

Key words: standardization of sequence stratigraphy, Upper Triassic Xujiahe Formation in Sichuan Basin, provenance system, sequencelithofacies paleogeography