# US 2021/0202042 A1 · Information classification processing method of carbonate reservoir and information data processing terminal

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- Number: US 2021/0202042 A1
- Document ID: US20210202042A1
- Status: Published application
- Kind: A1
- Application number: 17/038,362
- Filed: 2020-09-30
- Published: 2021-07-01
- Earliest claimed: 2019-12-31
- Assignees: Chengdu University of Technology
- Applicants: Chengdu University of Technology
- Inventors: Meiyan FU; Hucheng DENG; Wen ZHOU; Xiaobo GUO; Tao LU; Chenyang ZHAO; Liang ZHAO; Pei CHEN
- Web page: https://patentgrep.com/patent/US20210202042A1

## CPC

- G16B 40/00: ICT specially adapted for biostatistics; ICT specially adapted for bioinformatics-related machine learning or data mining, e.g. knowledge discovery or pattern finding
- E21B 49/005: {Testing the nature of borehole walls or the formation by using drilling mud or cutting data}
- E21B 49/02: by mechanically taking samples of the soil
- G01N 33/24: Earth materials (G01N33/42 takes precedence)
- G16B: BIOINFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR GENETIC OR PROTEIN-RELATED DATA PROCESSING IN COMPUTATIONAL MOLECULAR BIOLOGY
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

An information classification processing method of a carbonate reservoir and an information data processing terminal. The method includes: determining rock types; determining reservoir types on the basis of different rock types; and in accordance with the determined reservoir and rock types, performing porosity and permeability intersection by utilizing measured data; fitting a curve to obtain a porosity-permeability relation formula; and calculating permeability by utilizing the formula. According to the present invention, complex carbonate reservoirs in the Middle East can be classified, and porosity-permeability relations are respectively established, thereby increasing interpretation accuracy of permeability. According to the present invention, the reservoir types and the rock types can be rapidly and systematically classified, and clear porosity-permeability relations are obtained, so that interpretation of the permeability in oil reservoir exploitation is more accurate. The system has been applied to Halfaya Oilfield in Iraq of Middle East.

## Claims

### Claim 1

An information classification processing method of a carbonate reservoir, wherein the information classification processing method of the carbonate reservoir comprises the following steps:
step 1: determining rock types;
step 2: determining reservoir types on the basis of different rock types;
step 3: performing porosity and permeability intersection in accordance with the determined reservoir and rock types by utilizing measured data; fitting a curve to obtain porosity-permeability relation formulas; and calculating the permeability by utilizing the formulas.

### Claim 2 (depends on 1)

The information classification processing method of the carbonate reservoir according to claim 1, wherein the step 1 of determining rock types comprises:
(1) observing and identifying rock slices for components of limestone in the Middle East;
(2) counting relative content of lime mud matrixes, low-energy particles and high-energy particles, wherein the low-energy particles refer to green algae, bivalve and Denthic foraminifera that deposit in an environment having weak energy; and the high-energy particles refer to shellfishes, rudistids, Echinodermata, Bryozoans, stromatoporoids and corals that deposit in an environment having strong energy;
(3) normalizing the relative content of the above three components by utilizing a layout, and then performing cultellation; and determining corresponding rock types through cultellation.

### Claim 3 (depends on 1)

The information classification processing method of the carbonate reservoir according to claim 1, wherein in the step 2, the seven reservoir types are determined on the basis of different rock types:
(1) marlstone is not a reservoir, and content of the lime mud matrix is greater than 90%;
(2) wackestone is a poor reservoir and has particle content of 10-50%; the rock structure is of a matrix support structure; pores are mainly intercrystalline pores; a small amount of moldic pores are developed; the distribution of pore throat radius has a bimodal pattern; and a small pore throat is dominant;
(3) low-energy particle limestone is a poor or worse reservoir and has particle content of more than 50%; pores are mainly organism cavity pores and moldic pores;
and the limestone is of a large-pore fine-throat type;
(4) mixed particle limestone II is a poor reservoir and has particle content of more than 50%; pores are mainly intercrystalline pores and body cavity pores; a few biological moldic pores are developed; the distribution of the pore throat radius has a bimodal pattern; and through comparison, the two pore throat types are not obvious dominant types;
(5) mixed particle limestone I is a better reservoir and has particle content of more than 50%; pores are mainly inter-particle pores; moldic pores and organism cavity pores are developed; the pore type has duality; the distribution of the pore throat radius has a bimodal pattern; a large pore throat type is dominant; and the throat is mainly of a necking type;
(6) high-energy particle limestone II is a better reservoir and has particle content of more than 50%; however, a certain amount of lime mud exists among the particles;
a combination of inter-particle pores, inter-particle dissolved pores and intercrystalline pores is formed; the pores are mainly the intercrystalline pores; the throat is thick; permeability is high; the distribution of the pore throat radius does not have an obvious bimodal pattern; and a large pore throat type is dominant;
(7) high-energy particle limestone I is a good reservoir and has particle content of more than 75%; almost no lime mud matrix exists among the particles; the intercrystalline pores are dominant in the pore types; a small amount of inter-particle dissolved pores may be formed; the pores are mainly the intercrystalline pores; the throat is thick; the permeability is high; in the distribution of the pore throat radius, the large pore throat type is dominant; and for the large pore thick throat, the throat is mainly of a pore necking type.

### Claim 4 (depends on 1)

The information classification processing method of the carbonate reservoir according to claim 1, wherein the step 3 comprises: in accordance with relative content of the lime mud matrix determined in each rock sample, low-energy particles and high-energy particles, determining corresponding reservoir and rock types in combination with pore types; after analyzing the reservoir and rock types of all the rock samples, performing porosity and permeability intersection on measured porosity and permeability data corresponding to each reservoir type and each rock type, and performing regression fitting to obtain permeability calculation formulas taking the porosity as a function, wherein totally 6 formulas of reservoir rocks are formed; and by taking logging porosity as a function, calculating corresponding permeability of reservoir and rock types by utilizing the above permeability formulas.

### Claim 5 (depends on 1)

An information classification processing system of a carbonate reservoir for implementing the information classification processing method of the carbonate reservoir of claim 1, wherein the information classification processing system of the carbonate reservoir comprises:
a rock type determining module for determining corresponding rock types;
a reservoir type determining module for determining reservoir types on the basis of different rock types;
a porosity-permeability relation determining module of different reservoir types for performing porosity and permeability intersection in accordance with the determined reservoir and rock types by utilizing measured data, and fitting a curve to obtain porosity-permeability relations so as to calculate the permeability.

### Claim 6 (depends on 1)

An information data processing terminal for realizing the information classification processing method of the carbonate reservoir of claim 1.

### Claim 7 (depends on 2)

An information data processing terminal for realizing the information classification processing method of the carbonate reservoir of claim 2.

### Claim 8 (depends on 3)

An information data processing terminal for realizing the information classification processing method of the carbonate reservoir of claim 3.

### Claim 9 (depends on 4)

An information data processing terminal for realizing the information classification processing method of the carbonate reservoir of claim 4.

### Claim 10 (depends on 1)

A computer readable storage medium, comprising instructions, wherein when the instructions are executed on a computer, the computer executes the information classification processing method of the carbonate reservoir of claim 1.

### Claim 11 (depends on 2)

A computer readable storage medium, comprising instructions, wherein when the instructions are executed on a computer, the computer executes the information classification processing method of the carbonate reservoir of claim 2.

### Claim 12 (depends on 3)

A computer readable storage medium, comprising instructions, wherein when the instructions are executed on a computer, the computer executes the information classification processing method of the carbonate reservoir of claim 3.

### Claim 13 (depends on 4)

A computer readable storage medium, comprising instructions, wherein when the instructions are executed on a computer, the computer executes the information classification processing method of the carbonate reservoir of claim 4.