WO2018084394A1

WO2018084394A1 - Apparatus for predicting amount of desorption gas in shale gas layer by using geophysical well logging data analysis and method therefor

Info

Publication number: WO2018084394A1
Application number: PCT/KR2017/004208
Authority: WO
Inventors: 이현석; 양일호
Original assignee: 한국지질자원연구원
Priority date: 2016-11-01
Filing date: 2017-04-19
Publication date: 2018-05-11
Also published as: KR101826132B1; CA3011167C; CA3011167A1

Abstract

The present invention relates to an apparatus for predicting the amount of desorption gas in a shale gas layer through geophysical well logging data analysis and a method therefor, the apparatus allowing the amount of desorption gas in the shale gas layer to be predicted. The apparatus for predicting the amount of the desorption gas in the shale gas layer, comprises: a mineral and organic matter amount analysis part for analyzing the amounts of minerals and organic matters by means of thermal analysis on a shale sample collected from a borehole; a canister gas volume measurement part for measuring a gas amount by using gas inside a canister having the collected shale sample sealed therein; a correlation analysis part for extracting, as a main adsorption mineral, minerals having high correlation with the minerals with respect to the gas amount; a main adsorption mineral amount deriving part for deriving the amount of the main adsorption mineral; and a desorption gas amount prediction part for predicting the amount of the gas adsorbed onto a shale gas reservoir layer, by using the derived amount of the main adsorption mineral and the correlation.

Description

Desorption gas amount prediction device of shale gas layer through analysis of physical logging data and its method

The present invention relates to the desorption gas amount prediction of the shale gas layer, and more specifically, to derive the correlation between the results of the analysis of the physical logging data for each mineral and the canister gas volume measurement value, and selects the highly related major minerals. After deriving the selected main mineral content, the correlation between the derived main mineral content and the mineral and canister gas volume measurement values can be used to predict the desorption gas amount of the shale gas layer. Desorption gas amount prediction apparatus and its method are related.

Traditional gas is produced from organic matter in the source rock and then transported to reservoir rocks with high porosity and permeability. Shale gas is stored in the remaining gas is adsorbed in the organic pores in the source rock after the gas formed from the organic material of the source rock is moved to the reservoir. Shale gas is stored in shale with low permeability, so unlike conventional gas production methods, horizontal drilling is carried out along the shale layer containing a large amount of gas and then hydraulically crushed to produce gas. Therefore, shale gas development requires the selection of shale layers containing a large amount of gas.

In addition, unlike traditional gas resources, shale gas is distributed in very dense shale and has heterogeneous rock physics and geochemical characteristics in the reservoir. Therefore, rock physics and geochemical characterization of the reservoir is important for the efficient and sustainable gas production of shale gas. In particular, the gas produced from the shale gas reservoir is derived from free gases trapped in pores or cracks in rocks and desorption gases adsorbed on the surface of organic matter. However, free gas can be assessed by traditional methods, but desorption gas still lacks standardized evaluation techniques.

Accordingly, the present invention is to solve the above-mentioned problems of the prior art, the main adsorption of the highly correlated minerals through the relationship between the mineral and organic content analyzed in the reservoir core of the reservoir and the canister gas volume It is possible to predict the amount of desorbed gas in the shale gas layer quickly and accurately by selecting it as the main adsorbed mineral as a factor, deriving the selected main mineral content, and using the correlation to predict the amount of desorbed gas distributed in the shale reservoir. It is also an object of the present invention to provide an apparatus and method for estimating desorption gas amount of shale gas layer through physical logging data analysis that enables efficient and sustainable gas production of shale gas.

Desorption gas amount prediction device of the shale gas layer through the physical logging data analysis of the present invention for achieving the above object,

Mineral and organic content analysis unit for analyzing the mineral and organic content by thermal analysis on the shale sample collected from the borehole;

Canister gas volume measurement unit for measuring the gas content by using the gas inside the canister sealed sampled shale:

A correlation analysis unit for analyzing the correlation between the minerals and the gas content to extract the highly correlated minerals as the main adsorbed minerals;

A main adsorption mineral content deriving unit for deriving the extracted main adsorption mineral content; And

And a desorption gas content prediction unit for predicting the gas content adsorbed to the shale gas storage layer by using the correlation with the derived main adsorbed mineral content.

The mineral and organic content analysis unit may be configured to measure the TOC and mineral components and content for the organic material through XRD analysis.

The mineral and organic content analysis unit, natural gamma, neutron porosity, density, electrical resistivity, can be configured to perform the analysis of the logging data by the acoustic wave logging.

The mineral and organic content analysis unit may be configured to calculate the shale volume using a gamma ray logging and a neutron porosity-density logging combination.

The main adsorption mineral content is classified into clay minerals after the collected sample except the main adsorption mineral and the main adsorption mineral.

Where Vmain is the volume of the main adsorbed minerals, ρmain is the density of the main adsorbed minerals, Vclays is the volume of the clay minerals, ρclays is the density of the clay minerals, Vsh is the volume of the shale, and ρsh is the density of the shale. It features.

Desorption gas amount prediction method of the shale gas layer through the physical logging data analysis of the present invention for achieving the above object,

Mineral and organic content analysis process for analyzing mineral and organic content by thermal analysis on shale samples collected from boreholes by mineral and organic content analysis unit;

Canister gas volume measurement process for measuring the gas content by using the gas inside the canister sealed sample taken by the canister gas volume measurement unit:

A correlation analysis process of analyzing the correlation between the mineral and the gas content by a correlation analysis unit to extract the highly correlated minerals into the main adsorption minerals having a high gas volume;

A main adsorption mineral content derivation process for deriving a content of the main adsorption mineral extracted by the main adsorption mineral content derivation unit; And

And a desorption gas content prediction process for predicting the gas content adsorbed to the shale gas storage layer by using the correlation with the main adsorbed mineral content derived by the desorption gas content prediction unit.

The mineral and organic content analysis process may be a process of measuring TOC and mineral components and content of the organic material through XRD analysis.

The mineral and organic content analysis process may further include a process of performing analysis of the logging data by natural gamma, neutron porosity, density, electrical resistivity, and sound wave logging.

The mineral and organic content analysis process may further include calculating a shale volume using a gamma ray logging and a neutron porosity-density logging combination.

According to the present invention, the highly correlated minerals are selected as the main adsorption factors as the main adsorption factors through the relational expression utilizing the correlation between mineral and organic content and canister gas volume analyzed in the drilling core of the reservoir. By deriving the content of the selected major minerals, the correlation can be used to predict the amount of desorption gas distributed in the shale reservoir, enabling the rapid and accurate prediction of the amount of desorption gas in the shale gas layer. It provides the effect of enabling possible gas production.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram of a desorption gas amount prediction device 1 of a shale gas layer through physical logging data analysis according to an embodiment of the present invention.

Figure 2 is a flow chart showing the process of the desorption gas amount prediction method of the shale gas layer through the analysis of physical logging data of the present invention.

3 is a graph showing the correlation with the canister gas volume for each mineral in the sample taken.

In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted when it is deemed that they may unnecessarily obscure the subject matter of the present invention.

Since embodiments according to the concept of the present invention can be variously modified and have various forms, specific embodiments will be illustrated in the drawings and described in detail in the present specification or application. However, this is not intended to limit the embodiments in accordance with the concept of the present invention to a particular disclosed form, it is to be understood that the present invention includes all changes, equivalents, and substitutes included in the spirit and scope of the present invention. In addition, the word "exemplary" is used herein to mean "serves as an example, as an example, or as an illustration." Any aspects described herein as "exemplary" are not necessarily to be construed as preferred or advantageous over other aspects.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between. Other expressions describing the relationship between components, such as "between" and "immediately between," or "neighboring to," and "directly neighboring to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. As used herein, the terms "comprise" or "having" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof that is described, and that one or more other features or numbers are present. It should be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations thereof.

Hereinafter, with reference to the accompanying drawings showing an embodiment of the present invention will be described in more detail the present invention.

An embodiment of the present invention is to analyze the correlation between the mineral and organic matter (TOC) content and the canister gas volume analyzed in the drilling core of the Montney shale gas reservoir to derive the main adsorption minerals, the content of the main adsorption minerals The extraction equation was derived to predict the amount of desorption gas in the shale.

1 is a block diagram of a desorption gas amount prediction device 1 of a shale gas layer through physical logging data analysis according to an embodiment of the present invention.

As shown in FIG. 1, the desorption gas amount prediction device 1 of the shale gas layer includes a mineral and organic content analysis unit 10, a canister gas volume measurement unit 20, a correlation analysis unit 30, and main adsorption. And a mineral content extraction unit 40 and a desorption gas amount prediction unit 50.

The mineral and organic content analysis unit 10 is configured to analyze the mineral and organic content by thermal analysis on the shale sample collected from the borehole. Specifically, the mineral and organic content analysis unit 10 is configured to analyze the type and content of the TOC and minerals through XRD analysis, natural gamma, neutron porosity, density, electrical resistivity, sound wave logging. The volume of the shale is also configured to calculate using a gamma ray logging and neutron porosity-density logging combination.

The canister gas volume measuring unit 20 is configured to measure the gas content by using the gas inside the canister sealing the collected shale sample.

The correlation analysis unit 30 is configured to analyze the correlation between the minerals and the gas content to perform a correlation analysis to extract the highly correlated minerals as the main adsorption minerals having a high volume of gas adsorption amount.

The main adsorption mineral content extracting unit 40 is configured to derive the content of the extracted main adsorption mineral. The main adsorption mineral content extraction unit 40 classifies the collected sample as clay minerals except the main adsorption mineral and the main adsorption mineral

Derived by Where Vmain is the volume of the main adsorbed mineral, ρmain is the density of the main adsorbed mineral, Vclays is the volume of the clay mineral, ρclays is the density of the clay mineral, Vsh is the volume of the shale, and ρsh is the density of the shale.

The desorption gas amount prediction unit 50 is configured to predict the desorption gas content adsorbed on the shale gas by applying the derived main adsorption mineral content inversely to the correlation.

As shown in Figure 2, the desorption gas amount prediction method of the shale gas layer, mineral and organic content analysis process (S10), canister gas volume measurement process (S20), correlation analysis process (S30), the main adsorption mineral content derivation process (S40) ), The desorption gas amount prediction process in the shale gas (S50) is made.

The mineral and organic content analysis process (S10) is a process of analyzing the mineral and organic content by thermal analysis on the shale sample collected in the borehole by the mineral and organic content analysis unit. In this process, the types and contents of TOC and minerals are analyzed by XRD analysis, natural gamma, neutron porosity, density, electrical resistivity, and sonic logging. In addition, the volume of the shale is calculated using the gamma ray logging and the neutron porosity-density logging combination.

The canister gas volume measurement process (S20) is a process of measuring the gas content using the gas inside the canister sealed the sample taken by the canister gas volume measurement unit.

The correlation analysis process (S30) is a process in which the correlation between the mineral and the gas content is analyzed by the correlation analysis unit 30, and the highly correlated mineral is extracted as the main adsorption mineral having a high volume of the desorbed gas.

3 is a graph showing an example of the correlation with the canister gas volume for each mineral in the sample taken.

As shown in FIG. 3, in the correlation analysis process (S30), the canister volume, clay mineral, canister volume, illite / mica and smacktite, canister volume, illite / mica, and canister volume by the correlation analyzer 30. Correlations between canister volumes and minerals, such as elite / smectite, canister volume and kaolinite, canister volume and chlorite, are derived.

In the case of Figure 3 desorption gas content and correlation for each mineral is as follows.

8.966 + 0.743 * Volume of Clay minerals R ² = 0.442

7.748 + 0.971 * Volume of Illit / Smectite / Mica R ² = 0.537

6.317 + 8.534 * Volume of Illit / Smectite R ² = 0.682

8.150 + 1.079 * Volume of Illite / Mica R ² = 0.510

19.47 + 0.982 * Volume of Chlorite R ² = 0.034

20.90 + 7.996 * Volume of Kaolinite R ² = 0.050

In the case of FIG. 3, the correlation analysis result shows that the illite has the highest correlation with the amount of desorption gas.

Referring back to FIG. 2, after the main adsorption mineral having a high correlation with the desorption gas content is derived by performing the correlation analysis process (S30) as described above, the main adsorption mineral content derivation process (S40). The main adsorbed mineral content is derived. At this time, in order to derive the content of the illite, the main adsorption minerals, the sample is classified into clay minerals except for the illite and the illite, the main adsorption minerals. And replacing the main adsorbed mineral with illite

Derive the content of illite. Where Villite is the volume of illite as the main adsorbed mineral, ρillite is the density of illite, Vclays is the volume of clay mineral, ρclays is the density of clay mineral, Vsh is the volume of shale, and ρsh is the density of shale.

Next, in the desorption gas amount prediction process (S50), after the content of the illite as the main adsorption mineral is derived, the adsorption gas amount of the shale gas reservoir in the exploration area is predicted by applying the correlation with the desorption gas amount of each mineral in reverse.

The present invention can be applied to the shale gas resource development industry.

Claims

Mineral and organic content analysis unit for analyzing the mineral and organic content by thermal analysis on the shale sample collected from the borehole;

Canister gas volume measurement unit for measuring the gas content by using the gas inside the canister sealed sampled shale:

A correlation analysis unit for analyzing the correlation between the minerals and the gas content to extract the highly correlated minerals as the main adsorbed minerals;

A main adsorption mineral content deriving unit for deriving the extracted main adsorption mineral content; And

Desorption gas amount prediction device comprising a; desorption gas content prediction unit for predicting the gas content adsorbed in the shale gas storage layer by using the correlation with the derived main adsorption mineral content.
The method of claim 1, wherein the mineral and organic content analysis unit,

Desorption gas amount prediction device of the shale gas layer configured to measure the TOC and mineral components and content for the organic matter through XRD analysis.
The method of claim 2, wherein the mineral and organic content analysis unit,

Desorption gas amount prediction device of the shale gas layer configured to perform analysis of the logging data by natural gamma, neutron porosity, density, electrical resistivity, and sonic logging.
The method of claim 2, wherein the mineral and organic content analysis unit,

A desorption gas amount prediction device of a shale gas layer configured to calculate a shale volume using a gamma ray logging and a neutron porosity-density logging combination.
The method according to claim 1, wherein the main adsorption mineral content is.

After classifying the collected sample as clay mineral except the main adsorption mineral and main adsorption mineral
Where Vmain is the volume of the main adsorbed minerals, ρmain is the density of the main adsorbed minerals, Vclays is the volume of the clay minerals, ρclays is the density of the clay minerals, Vsh is the volume of the shale, and ρsh is the density of the shale. Desorption gas amount prediction device of a shale gas layer characterized by the above-mentioned.
Mineral and organic content analysis process for analyzing mineral and organic content by thermal analysis on shale samples collected from boreholes by mineral and organic content analysis unit;

Canister gas volume measurement process for measuring the gas content by using the gas inside the canister sealed sample taken by the canister gas volume measurement unit:

A correlation analysis process of analyzing the correlation between the mineral and the gas content by a correlation analysis unit to extract the highly correlated minerals into the main adsorption minerals having a high gas volume;

A main adsorption mineral content derivation process for deriving a content of the main adsorption mineral extracted by the main adsorption mineral content derivation unit; And

Desorption gas amount prediction method comprising a; desorption gas content prediction process for predicting the gas content adsorbed in the shale gas storage layer by using the correlation with the main adsorption mineral content derived by the desorption gas content prediction unit.
The method of claim 6, wherein the mineral and organic content analysis process,

A method of predicting the amount of desorption gas in the shale gas layer, which is a process of measuring TOC, mineral components and contents of organic matter through XRD analysis.
The method of claim 7, wherein the mineral and organic content analysis process,

A method for predicting the desorption gas amount of the shale gas layer further comprising analyzing the logging data by natural gamma, neutron porosity, density, electrical resistivity, and sonic logging.
The method of claim 7, wherein the mineral and organic content analysis process,

A method of estimating desorption gas content of a shale gas layer further comprising calculating a shale volume using a gamma ray logging and a neutron porosity-density logging combination.
The method according to claim 1, wherein the main adsorption mineral content,

After classifying the collected sample as clay mineral except the main adsorption mineral and main adsorption mineral
Where Vmain is the volume of the main adsorbed mineral, ρmain is the density of the main adsorbed mineral, Vclays is the volume of the clay mineral, ρclays is the density of the clay mineral, Vsh is the volume of the shale, ρsh is the density of the shale Method for predicting the amount of desorption gas in the gas layer.