Method for Determining Saturation Index of Heterogeneous Carbonate Reservoir

A carbonate rock reservoir and saturation technology, which is applied in earthwork drilling, electric/magnetic exploration, acoustic re-radiation, etc., can solve the problems of inconvenient programming calculation, large variation range, and difficulty in realization, and achieve convenient Dynamic calculation, convenient determination method, and the effect of improving calculation accuracy

Active Publication Date: 2018-05-04
PETROCHINA CO LTD
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Problems solved by technology

The general relational formula solves the problem of accurate quantitative calculation of the saturation of heterogeneous complex reservoirs theoretically, but under the current technical conditions, two key technical The relational expression is a general solution equation, which is inconvenient to be directly used in programming calculations. That is, under the existing logging technology conditions, it is quite difficult to determine all the parameters in the general relational relation. Therefore, in practical applications, it is necessary to select according to the actual reservoir characteristics to meet the accuracy requirements. The shortest form (also known as the best form); secondly, it is necessary to choose a reliable method to accurately determine each undetermined parameter in the best form, so that the final calculation model can reflect the relationship between reservoir resistivity and water saturation to the greatest extent. real law between
The first type of method belongs to the direct method, which is a conventional method for determining the saturation index n at present, but there are two shortcomings in practical application: First, in order to determine the saturation index n, it is necessary to carry out variable saturation lithoelectric experiments on each core ( Such as gas drive method), and the experiment usually takes a long time; secondly, it is difficult to dynamically determine the value of the saturation index n based on the logging data and reservoir characteristics by using this method
Most of these studies focus on sandstone reservoirs, and there are relatively few studies on the dynamic determination method of carbonate saturation index n
In addition, existing studies are more based on the analysis of the relationship between saturation index n and reservoir porosity and permeability. For heterogeneous complex carbonate rocks, the research shows that the variation range of saturation index n under the same porosity and permeability is Therefore, how to accurately determine the value of the carbonate saturation index n is a major challenge in the current logging evaluation

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[0045] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0046] Such as figure 1As shown, an embodiment of the present application provides a method for determining the saturation index of a heterogeneous carbonate rock reservoir, the method comprising the following steps:

[0047] S100: Dividing the target rock reservoir into at least two reservoir types according to predetermined ru...

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Abstract

The present application discloses a method for determining a saturation index of a heterogeneous carbonate rock reservoir, including: dividing a target rock reservoir into at least two reservoir types according to a predetermined rule; obtaining a saturation index in each reservoir type The corresponding relationship between the irreducible water saturation and the irreducible water saturation; determine the type of reservoir to which the core to be tested belongs according to the predetermined rule; obtain the irreducible water saturation of the core to be tested; The saturation index of the core to be tested is calculated according to the corresponding relationship of the reservoir type to which it belongs.

Description

technical field [0001] The invention relates to the technical field of well logging evaluation of oil and gas reservoirs, in particular to a method for determining the saturation index of heterogeneous carbonate rock reservoirs. Background technique [0002] The conductivity of reservoir rock mainly depends on the fluid properties, saturation state and its spatial distribution in the pore space. For heterogeneous carbonate reservoirs, the pore structure has a significant impact on the resistivity, and sometimes fractures and caves have a great influence on the electrical conductivity. The influence of resistivity far exceeds the influence of oil and gas. Many researchers have tried to get rid of the traditional method of calculating saturation by relying solely on resistivity curves for more than 70 years, and tried to use various non-electric logging methods to calculate saturation of carbonate rocks. The effect is not ideal. Therefore, so far, the calculation of saturatio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24G01V3/38
CPCG01N33/24G01V3/38G01V99/005E21B49/00G01V3/18
Inventor 李宁王克文石玉江武宏亮赵太平冯庆付冯周张海涛朱保定杨小明
Owner PETROCHINA CO LTD
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