Saturation modeling method based on oil-containing boundary and oil-water transition zone constraint

Abstract

The invention discloses a saturation modeling method based on oil-containing boundary and oil-water transition zone constraint. The method comprises the following steps: (1) establishing a target workarea construction model and a sedimentary microfacies model; (2) establishing an oil-bearing boundary model of a target work area according to a geological oil reservoir research result; (3) establishing an oil-water interface and a height model above the oil-water interface according to an oil-water interpretation result of the logging curve; (4) generating a height logging curve above an oil-water interface, and establishing a cross plot with a water saturation logging interpretation result; (5) establishing a nonlinear fitting function according to the cross plot, and establishing a watersaturation model by utilizing an attribute calculation function; and (6) performing interactive calculation on the model and an oil-containing boundary model to obtain a final oil saturation model ofthe work area. According to the method, the oil saturation model conforming to the underground oil-water distribution rule is established, the repeatability is high, the operability is high, and laterhistorical fitting, scheme prediction and remaining oil research are facilitated.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and relates to geological modeling technology in fine description of oil reservoirs, in particular to a saturation modeling method based on constraints of oil-bearing boundaries and oil-water transition zones. Background technique [0002] Three methods are generally used for the initial calculation of the original oil saturation of the reservoir numerical simulation model: [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. However, the conventional balance method will lead to the same original oil saturation value in the large connected areas of the reservoir, which does not conform to the real reservoir fluid distribution. In order to improve the a...

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Problems solved by technology

However, this method requires the digital model to calibrate the capillary pressure curve and relative permeability curve, otherwise the model will be unbalanced in the initial state, the fluid will flow, and the reserves calculated by the geological model and the digital model will also deviate

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