Saturation modeling method with equivalent J function constraint

Abstract

The invention discloses a saturation modeling method with equivalent J function constraint. The saturation modeling method with the equivalent J function constraint comprises the following steps of 1)establishing a sedimentary microfacies model, a porosity model and a permeability model of a target work area; 2) establishing a height model above an oil-water interface according to the oil-water interface; 3) establishing an equivalent J function model; 4) generating a height logging curve above the oil-water interface of each single well in the target working area; 5) generating an equivalentvariable curve of different sedimentary facies; 6) establishing an intersection graph of the equivalent variable curve and a logging water saturation curve under different sedimentary facies conditions, and establishing a linear fitting distribution function; 7) converting the equivalent J function model generated in the step 3) into a fitted water saturation geological model; 8) establishing anoil-containing boundary model; and 9) obtaining a water saturation model after boundary constraint, further obtaining an oil saturation model of the target work area, and obtaining a geological modelof the original oil saturation of the oil reservoir.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a saturation modeling method constrained by an equivalent J function. Background technique [0002] At present, the original oil saturation initialization calculation of the reservoir model generally adopts three methods: [0003] The first is equilibrium initialization. The model uses relative permeability curves and capillary pressure curves to calculate the distribution of initial saturation. This method requires the setting of the oil-water interface and is calculated by numerical simulation software. [0004] The second is the enumeration method, which uses the original oil saturation value interpreted by well logging to perform interpolation calculation through geological modeling software, outputs the original oil saturation field, and directly assigns it to the numerical model. [0005] The third method is the J function method, in which...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a saturation modeling method constrained by the equivalent J function, which overcomes 1 in the prior art: the oil-water interface needs to be set up for balance initialization, and the calculation is performed by numerical simulation software , the workload is heavy; 2: The enumeration method uses the original oil saturation value interpreted by well logging to perform interpolation calculation through geological modeling software, and outputs the original oil saturation field, which is directly assigned to the numerical model, and the accuracy of the saturation model is poor; 3: The establishment of the J-function of the J-function method requires the determination of many parameters related to the rock, and often requires special core analysis to obtain it, and the workload is large; 4: The existing method cannot achieve a balanced vertical distribution of saturation data and other issues.

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