Research Of Model Of Ng3～6 Layers Of I Area In Mid Gudao Oil Field

The Ng3-6 unit of I area in mid Gudao oil field has been exploited for nearly forty years and comes into development phase with the tertiary oil recovery to enhanced oil recovery. But because that there is no fine reservoir model, the technologic measures of keeping oil production rate and controlling water cut is restricted badly. The research for fine reservoir model with high water cut of this unit can deal with problems such as reservoir engineering and reservoir geology, and provide dependable reference for injecting polymer to exploit oil field.Based on the multidisciplinary comprehensive research, emphasized that the geology research is principal part and the fine partition and compare of formation, description of sand body, research of formation characters and analysis of exploitation performance is the masterstroke, the reservoir is researched integratively, and the dynamic and digitized reservoir model of Ng3-6 unit of I area in mid Gudao oil field is built by the way with modern reservoir description, research of fluid percolation characters and reservoir simulation. According to the formation characters of Gudao oil field and applying the theory of fluvial facies sediment, the formation is finely compared and the intended zone Ng3-6 is classified four sand groups and nineteen layers. According to the rhythmicity of sand body, electric property group, sand body interval and distributing of interbed, the formation is divided by units with time unit, and the eight main layers are divided into nineteen time units. The distribution of layers is described by the analysis of sedimentary facies of sand body and research of reservoir deposition characteristics. Anisotropy of layers is evaluated quantitatively by applying statistics and evaluated method of several reservoir parameters, and detailedly analyzed the main factors of affect macro anisotropy. The formation characters of layers of Ng3-6 unit are controlled by the sedimentary facies belt, the characters become worse gradually and degree of aeolotropism heightened gradually. Based on the above research, the 3D reservoir geological model including structure geometry model, thickness model, effective thickness model, porosity model and permeability model is built by using the random modeling of petrel software, and the geology and fluid property of work area is finely depicted in the 3D space. Based on the theory that fluid percolation character is controlled by the change of reservoir physical property and the research of reservoir character, fluid percolation rule is analyzed and reservoir percolation character model is presented and built. The fluid and dynamic reservoir model can impersonally describe the dynamic characters of reservoir exploitation, and establish the stability foundation for dynamic analysis and research of EOR.