The integrative research of 3D geological modeling and reservoir numerical simulation
With the rapid development of computer, the integration research of geological modeling and numerical simulation is more and more emphasized in oilfield. In this paper, the flow mathematical model is established, which considers starting up pressure gradient for low permeability reservoir. Based on the research of the geology characteristics, fine stratigraphic correlation and sedimentary facies, the 3D geological model is established through integrated research considering geology and reservoir, including facies model, oil saturation model, porosity model, permeability model and NTG model. Then the remaining oil distribution was calculated through fine reservoir simulation. Based on history match, the distribution of remaining oil is analysed through the research of deposition facies and flow layer, which can be used for reference on oilfield development potential adjustment and scheme design.
The Numerical Simulation Research of The Remaining Oil Distribution Regulation in Test Site of Low Permeability Oil Field
Static data of the well network of Gaotaizi reservoir in the test site is collected and analysed. The data of 126 wells are analyzed in detailed screening. Then make facies control interpolation calculation by the modeling software, and establish the fine geological model for numerical simulation. The grid step size is 30 meters, and the grid nodes are divided into 106×53×115 = 646070. According to fine geological research results for years, considering fully the plane heterogeneity of layers and the interlayer contradiction in the model. The number of separate layer is 114, which is divided into 114 simulated layers. Make facies control interpolation calculation of grid properties in model (porosity, permeability, effective thickness, original water saturation) by the modeling software. The result can reflect better the change trend of layers. The attribute models are shown in Fig.1, 2, 3, 4. In order to improve the calculation precision and speed, we transform the corner-point grid exported into the blockcentered grid by grid conversion module, and adjust the distance between the grid block for making the oil-water wells in the center of the grid.
Mathematical Modeling of Scour and Deposition
Electronic computers are opening up the field of sedimentation engineering by permitting the analysis of problems which heretofore have required too much time and effort. Movable stream bed profiles are being calculated in addition to water surface profiles. The initial gradation of sediment material in the stream bed may be prescribed to facilitate the calculation of an armor layer. This gradation is continually changed by the computer program in response to sediment particles being deposited on the stream bed and material on the stream bed being removed to satisfy transport capacity. Hydraulic sorting of sediment by grain size is accomodated. The stream bed does not have to be represented by a single grain size. Retardance of motion because of armor layer is calculated.