The influence of sedimentary systems and paleo-geomorphology on the physical properties of a reservoir in the Niubao formation, Lunpola basin, central Tibetan Plateau

The Lunpola basin is the only sedimentary basin with industrial oil flow on the Tibetan plateau, and the Niubao formation is the main oil and gas reservoir within it. However, in the previous papers, only the sequence stratigraphy, oil and gas geological characteristics, and some geochemical indicators of the Lunpola basin were researched, which is not point out in the paleo-geomorphology and sedimentary microfacies that are beneficial to the reservoir, as well as their spatial distribution. This paper focuses on reconstructing the paleo-topography and the sedimentary systems of the Lunpola basin and analyzing the relationship between reservoir’s physical properties and the former two during the Eocene period. The results show two types of paleo-geomorphology, with great influence on the physical properties of the reservoir. Research into the physical properties of sedimentary systems has found that porosity and permeability are positively correlated with some sedimentary microfacies, and the physical properties of reservoirs have obvious advantages in some of these. These discoveries provide a theoretical basis for the evaluation of the properties of reservoirs on the Qinghai-Tibet Plateau.