Dual-medium reservoir rock water saturation calculating method based on percolation network simulation

A dual medium, percolation network technology, applied in wellbore/well components, earthwork drilling, etc., can solve the problems of poor adaptability and error of electrical logging in carbonate rocks

Active Publication Date: 2017-01-04
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0021] To sum up, the method of calculating rock water saturation by Archie’s formula has many defects in theory and logic, which leads to its poor adaptability to electrical logging of carbonate rocks. There will be large errors in the interpretation of rock oil and gas saturation

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  • Dual-medium reservoir rock water saturation calculating method based on percolation network simulation
  • Dual-medium reservoir rock water saturation calculating method based on percolation network simulation
  • Dual-medium reservoir rock water saturation calculating method based on percolation network simulation

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Embodiment 1

[0137] It is known that a matrix-dissolved pore type carbonate gas reservoir section has a burial depth of 2100-2110m, a total porosity φ of 11.9%, a gas permeability k of 11.2mD, and a true formation resistivity R t = 16.64Ω·m. The formation water resistivity R of the well is known from the water analysis data w = 0.1 Ω·m. For regional rock electricity experiment data, see figure 2 and Figure 4 . Using the original method to fit the experimental data of rock electricity in the area: a=1.2173, m=1.658, b=1.0732, n=1.108. Calculate the water saturation of the carbonate reservoir interval.

[0138] (1) According to figure 1 A rock sample was cut into segments A, B and C as shown. The regional lithoelectric test data of this reservoir interval are as follows: figure 2 and Figure 4 shown. Since the reservoir is a natural gas reservoir, it can be assumed that the reservoir rock is hydrophilic.

[0139] (2) Refitting figure 2 The experimental data in, get figure 2...

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Abstract

The invention discloses a dual-medium reservoir rock water saturation calculating method based on percolation network simulation. The method comprises the steps that (1) a rock sample is cut into a segment A, a segment B and a segment C, the segment A is subjected to a rock-electric test and a nuclear magnetic resonance test, the segment B is subjected to wettability measurement, and the segment C is subjected to a scanning electron microscope test; (2) the function relationship between the formation factor F and the porosity phi is fit; (3) constants C1 and C2 are calculated, and C1 and C2 reflect pore throat features and resistivity properties of dual-medium reservoir matrix pores; (4) the pore throat radius variable coefficient sigma of a rock dissolved pore system is worked out; (5) a dual-medium percolation network model is established, and by means of a trial-and-error method, the coordination number z of the dissolved pore system is determined through network simulation; and (6) the value of B' is determined, and the dual-medium reservoir rock water saturation S<w> is obtained. According to the method, an explanation method of logging through the electric field vector geophysical method is perfected, and the defects of theoretical knowledge of reservoir rock electrical properties and rock water saturation calculating methods are overcome.

Description

technical field [0001] The present invention relates to a method for calculating the electrical properties of dual-media oil-gas reservoir rocks and the water saturation of reservoir rocks, in particular to realize the quantitative calculation of the water saturation of oil-gas reservoir rocks based on the experimental data of rock electrical properties and electrical logging data. It is a geophysical electrical logging data interpretation method. Background technique [0002] Oil and gas resources are mainly stored in underground rock formations, such as sandstone and carbonate rocks. Both sandstone and carbonate reservoir rocks can develop as single-media or dual-media reservoirs. Here, the reservoir rock pore types mainly include pores, fractures, and dissolved pores. In the present invention, single medium refers to rocks with only pores in the pore space, and double medium refers to rocks with two types of pores, pores and dissolved pores in the pore space of rocks, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 李闽唐雁冰赵金洲肖文联王颖李晓
Owner SOUTHWEST PETROLEUM UNIV
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