Saturation index prediction method based on pore structure

A technology of pore structure and prediction method, which is applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve the problems of long time consumption, difficulty in displacing tight sandstone, and difficulty in carrying out electrical experiments of tight sandstone rock, and achieve accurate determination Effect

Active Publication Date: 2016-03-16
PETROCHINA CO LTD
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Problems solved by technology

For tight sandstone reservoirs, due to their low porosity and permeability, especially the fine reservoir throat and complex pore throat structure, it is often difficult to carry out rock electrical experiments...

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  • Saturation index prediction method based on pore structure
  • Saturation index prediction method based on pore structure
  • Saturation index prediction method based on pore structure

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Embodiment Construction

[0053] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, those skilled in the art Modifications to various equivalent forms of the present invention fall within the scope defined by the appended claims of the present application.

[0054] The invention provides a method for determining the saturation of tight sandstone reservoirs, which can accurately determine the saturation of tight sandstone reservoirs by determining the law of saturation index changes with pore structure, so as to identify and quantitatively evaluate oil and gas layers in well logging Accuracy provides an accurate basis.

[0055] figure 1 It is a flowchart of a method for predicting saturation index based o...

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Abstract

The invention discloses a saturation index prediction method based on a pore structure. The saturation index prediction method includes the steps that firstly, a representativeness core sample of a target layer is selected, a salt solution with a certain concentration is used for saturation, and the nuclear magnetic resonance spectrums T2 of a saturated rock core are measured; secondly, a centrifugal machine is used for centrifuging the saturated rock core under different rotating speeds, and the nuclear magnetic resonance spectrums T2 of the rock core in different centrifugal states are measured; thirdly, the geometric mean value T2 of the nuclear magnetic resonance spectrums T2 of the saturated rock core, the geometric mean value T2 of the nuclear magnetic resonance spectrums T2 of the rock core in different centrifugal states and the water saturation of the rock core are calculated; fourthly, the distribution change rate of the spectrums T2 is constructed, the pore structure index n' of the rock core is obtained according to the change relation curve of the distribution change rate of the spectrums T2 and the water saturation; and fifthly, the saturation index of the rock core is predicted according to the pore structure index n' of the rock core, and the saturation index of the target layer is determined.

Description

technical field [0001] The invention relates to the technical field of well logging evaluation of oil and gas reservoirs in petroleum exploration, in particular to a method for predicting saturation index based on pore structure. Background technique [0002] In oil exploration and development, the main task of well logging evaluation is to complete the identification and quantitative evaluation of oil and gas layers based on a series of parameters obtained from well logging. Among them, the oil saturation parameter in a series of parameters can affect the judgment of pay layer type and the accuracy of reserve calculation, so it is extremely important in the evaluation of reservoir logging in oil and gas reservoirs. [0003] On the one hand, oil saturation is the basic basis for identifying oil and gas layers. At present, when performing well logging evaluation, it is usually necessary to use saturation as the basis for dividing production layers to determine the types of o...

Claims

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Application Information

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IPC IPC(8): E21B49/00
Inventor 李霞徐红军王铜山王昌学朱大伟李潮流李长喜胡法龙刘忠华俞军
Owner PETROCHINA CO LTD
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