Sequence stratigraphy of Upper Jurassic-Lower Cretaceous fan-delta outcrops in Luanping

Abstract：Stratigraphic division and correlation are the basic and very important content of study during oilfield development. In various stages from oilfield development to adjustment, higher and higher requirements are set for the stratigraphic division and correlation. However, the underground information is limited in a real oil field. Firstly, when the well pattern density reaches a certain level, infill wells are not unrestricted. Secondly, the overwhelming majority of underground information is obtained by well logging, but the resolution of log data is limited. Therefore, during the wide application of high-resolution sequence stratigraphy, outcrop research is essential. Based on actual fan-delta outcrops, the authors have summarized the indicators of recognizing the high-frequency sequences, parasequences and parasequence sets in the fan delta of the outcrop area, quantitatively studied the distribution characteristics, geometry, internal structure and heterogeneity of sandbodies of different genetic types, transformed the outcrop indicators of the high-resolution sequence boundaries into underground core and log information and finally summed up general principles of sequence stratigraphic correlation on the basis of the outcrop research.