Abstract:

Taking the Paleogene fluvial reservoirs in Gangdong area in Northern Dagang oilfield as an example, the reservoirs in Gangdong area can be divided into 118 time-stratigraphic units vertically and 2681oil-bearing sandbodies laterally based on fine reservoir correlation and study of reservoir structure and flow barriers. Totally 9000 flow units are defined by using factorial analysis method according to the spatial distribution of physical properties of each sand body and the dynamic analysis data. Numerical modeling and conventional reservoir engineering methods have further been used to progressively determine the quantities of the remaining oil potential in each flow unit and define 6 types of remaining oil potentials. Areas with remaining oil potentials that have been formed due to imperfect flood pattern, the difference of producing status between various vertical flow units,and the impacts of flow barriers and microstructures are the main targets of development in the future.

Key words: fluvial reservoir, flow unit, petrophysical facies, flow barrier, seepage flow difference, remaining oil