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Method for identifying gas reservoir, water-bearing stratum, reservoir with high gas-oil ratio and gas saturation

A technology of gas-oil ratio and saturation, which is applied in the field of oil and gas field exploration and development logging data fluid type discrimination method and quantitative calculation of reservoir parameters, and can solve the problem of inaccurate calculation of saturation

Active Publication Date: 2015-02-11
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention solves the two major problems of the error in judging the fluid type based on the resistivity curve and the inaccurate calculation of the saturation caused by the complex pore structure, and is one of the effective ways to solve the fluid type judgment and saturation calculation of complex pore structure reservoirs one

Method used

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  • Method for identifying gas reservoir, water-bearing stratum, reservoir with high gas-oil ratio and gas saturation
  • Method for identifying gas reservoir, water-bearing stratum, reservoir with high gas-oil ratio and gas saturation
  • Method for identifying gas reservoir, water-bearing stratum, reservoir with high gas-oil ratio and gas saturation

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Embodiment 1

[0055] The invention discloses the realization of a method for identifying gas layers and water layers, high gas-oil ratio reservoirs and gas saturation calculation methods by using the bulk modulus of pore fluids, which belongs to the fluid type discrimination method and reservoir parameters of oil and gas field exploration and development logging data Quantitative calculation category to solve the two major problems of the error in judging the fluid type based on the resistivity curve and the inaccurate calculation of saturation due to the complex pore structure, and there is no gas saturation calculation method for high gas-oil ratio reservoirs. question.

[0056] The present invention calculates the bulk modulus of the pore fluid value, identify gas layers, water layers and high gas-oil ratio reservoirs, and use Calculate the gas saturation of gas layers, water layers, and high gas-oil ratio reservoirs. The calculation of the bulk modulus of the pore fluid should be ba...

Embodiment 2

attached figure 1 illustrate:

[0088] Using the bulk modulus of pore fluid to identify gas-water layers and high gas-oil ratio reservoirs is realized in six steps, followed by the bulk modulus of the rock matrix Calculation of Dry Rock Skeleton Bulk Modulus Calculation of the poroelastic modulus Calculation of the bulk modulus of fluid-saturated rock Calculation of the pore fluid bulk modulus Based on the calculation of the bulk modulus of the pore fluid, the gas-water layer and the high gas-oil ratio reservoir are identified based on the significant difference in the bulk modulus of natural gas, water, and oil.

attached figure 2 illustrate:

[0089] The calculation of gas saturation in gas-water layers and high gas-oil ratio reservoirs is realized in six steps, which are respectively the rock matrix bulk modulus Calculation of Dry Rock Skeleton Bulk Modulus Calculation of the poroelastic modulus Calculation of the bulk modulus of fluid-saturated rock Cal...

Embodiment 3

[0091] attached Figure 3a , 3b A rock model used to calculate volume-averaged elastic parameters assuming minerals are distributed in parallel.

[0092] The various minerals that make up the matrix are different, and the bulk modulus of the rock matrix is ​​also different. The bulk modulus of the rock matrix is ​​the comprehensive effect of various minerals and is the average value of various minerals. It can be used or Average formula to calculate. If the rock is known to have mineral composition, of which the The proportion of minerals in rock volume is , if the bulk modulus of each material ( represents the bulk modulus or shear modulus) is known, then the effective bulk modulus of the rock matrix can be used or Average formula to calculate.

[0093] Reuss formula (1)

[0094] the formula (2)

[0095] The formula assumes that the strain after stress in each component of the rock is equal (m...

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Abstract

The invention discloses a method for identifying a gas reservoir, a water-bearing stratum, a reservoir with a high gas-oil ratio and gas saturation. The method comprises the following steps: calculating a bulk modulus value Kf of a pore fluid, identifying the gas reservoir, the water-bearing stratum and the reservoir with the high gas-oil ratio, and utilizing the value Kf to calculate the gas saturation of the gas reservoir, the water-bearing stratum and the reservoir with the high gas-oil ratio. The method disclosed by the invention solves the two problems that as the pore structure is complicated, mistakes can appear in the specific resistance curve based fluid type judgment, and the saturation cannot be accurately calculated, and is one of efficient approaches for solving the problems of the reservoir fluid type judgment of the complicated pore structure and the saturation calculation.

Description

technical field [0001] The invention relates to the realization of a method for identifying gas layers and water layers, high gas-oil ratio reservoirs and gas saturation calculation methods by using the bulk modulus of pore fluid, which belongs to the fluid type discrimination method and reservoir parameters of oil and gas field exploration and development logging data Quantitative computing field. Background technique [0002] Whether the oil, gas, and water layers in the reservoir can be effectively distinguished is the premise that there are differences in the physical parameters of oil, gas, and water. In addition, complex factors such as lithology, pore structure, and reservoir type are also serious. It affects the accuracy of fluid type identification in complex reservoirs, especially the influence of pore structure on resistivity may be much greater than that of fluid type on resistivity, which makes the widely used electrical method effective in identifying the type ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 赵辉欧阳诚韩翀石新冯仁蔚姚梦麟曹博超朱萌
Owner BC P INC CHINA NAT PETROLEUM CORP
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