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Method for determining saturation of compact sandstone reservoir

A tight sandstone reservoir, saturation technology, applied in the direction of earth drilling, special data processing applications, instruments, etc.

Active Publication Date: 2015-12-02
PETROCHINA CO LTD
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  • Application Information

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Problems solved by technology

The experimental study on rock-electricity of tight sandstone reservoirs found that Archie's formula, which is suitable for fixed rock-electricity parameters of medium-high porosity-permeability reservoirs, has certain inapplicability in the quantitative evaluation of oil and gas bearing properties of tight sandstone reservoirs.

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  • Method for determining saturation of compact sandstone reservoir
  • Method for determining saturation of compact sandstone reservoir
  • Method for determining saturation of compact sandstone reservoir

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Embodiment Construction

[0078] 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.

[0079] 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.

[0080] see figure 1 , a step diagram of a method for determining the saturation of a ...

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Abstract

The invention discloses a method for determining saturation of a compact sandstone reservoir. The method includes: acquiring basic parameters of a rock core, wherein the basic parameters include nuclear magnetic resonance total porosity, bound water saturation and resistivity increasing coefficient under different saturation degrees; determining an optimal fixed cutoff value according to the nuclear magnetic resonance total porosity and bound water saturation, and determining macropore ratio and macropore component according to the optimal fixed cutoff value and the nuclear magnetic resonance total porosity; acquiring saturation coefficient of the rock core according to the resistivity increasing coefficient, and determining a function relation between saturation coefficient of the compact sandstone reservoir and the macropore component according to the saturation coefficient of the rock core and the macropore component; determining saturation of the compact sandstone reservoir according to the function relation between the saturation coefficient and the macropore component. By the method, saturation of the compact sandstone reservoir can be determined accurately.

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 determining the saturation of tight sandstone reservoirs. 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 the above-mentioned series of parameters can affect the accuracy of judgment of production layer type and calculation of reserves, so it is extremely important in logging evaluation of oil and gas reservoirs. [0003] Specifically, on the one hand, the 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 the saturation as the basis for dividing production...

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Application Information

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IPC IPC(8): E21B49/00G06F19/00
Inventor 李霞李潮流王铜山李长喜王昌学胡法龙徐红军俞军刘忠华
Owner PETROCHINA CO LTD
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