# US 2014/0156192 A1 · Systems and methods for determining position of marker depth coordinates for construction of geological model of deposit

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- Number: US 2014/0156192 A1
- Document ID: US20140156192A1
- Status: Published application
- Kind: A1
- Application number: 14/094,773
- Filed: 2013-12-02
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Applicants: Ooo Rock Flow Dynamics
- Inventors: OLGA ANDREEVNA CHESKIS; SEMEN LEONIDOVICH TREGUB; ANDREY SERGEEVICH KAZAROV
- Web page: https://patentgrep.com/patent/US20140156192A1

## CPC

- E21B 47/04: Measuring depth or liquid level
- G01V 1/40: specially adapted for well-logging
- G01V 1/50: Analysing data
- G01V 11/00: Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
- G01V 20/00: Geomodelling in general
- G01V 2210/60: Analysis
- G06F 30/20: Design optimisation, verification or simulation (optimisation, verification or simulation of circuit designs G06F30/30)
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

The invention relates to constructing a geological model of oil or other mineral deposit. In particular, the invention refers to the method, device, and machine-readable data carrier intended for evaluating the correlation coefficient for a set of well log curves and determining the position of marker depths at which the coefficient of correlation is maximal. A technical result is the improved accuracy of evaluation of parameters used in the construction of geological model describing the location of oil or other deposits. The method makes enables calculation of the depths of marker in a group of wells, given the depths to this marker in another well group used as a reference set. For any well W where the marker depth is to be determined, wells from the reference group are chosen lying at specified distance from the well W and the well with the maximal correlation coefficient is chosen among them.

## Claims

### Claim 1

A computer-implemented method for determining a position of a coordinate of marker depth in well W for a construction of a geological model of a mineral deposit, the computer-implemented comprising:
1) determining a reference group of wells;
2) determining wells W lying within a specified neighborhood of the reference group of wells where the neighborhood does not exceed the value of distance R from any well of the reference group;
3) determining a correlation function C(z), and choosing for each well W identified at the previous stage a well from the reference group with the maximal correlation coefficient and an appropriate point zmax in well W;
4) testing the well W, and, if the tests are successful, the choice of the well is approved and the depth zmax corresponding to the maximal correlation is taken as the marker depth at well W;
5) adding the well W thus found to the reference well group; and
6) reiterating all steps of the method until no well W is found at step 1) or steps 2) or 3).

### Claim 2 (depends on 1)

The computer-implemented method according to claim 1, characterized in that a test is used to check whether the maximum of correlation function C(z) in point zmax is in excess of the specified threshold value; the value of the maximum of the correlation function during the test is rounded upward to the nearest tenth; if the value of the rounded correlation maximum is greater than or equal to the specified threshold value, the well is classified as not meeting the test conditions.

### Claim 3 (depends on 2)

The computer-implemented method according to claim 2, characterized in that an additional test is used to check whether the correlation quality coefficient is in excess of a specified threshold value; the coefficient of the quality of correlation being defined as a coefficient of deviation of the local maximum of correlation function, nearest in terms of value, from its largest local maximum in point zmax; if the value of the correlation quality coefficient is less than the specified threshold value, the well being tested is classified as not meeting the test conditions.

### Claim 4 (depends on 2)

The computer-implemented method according to claim 2, characterized in that an additional test is used to check whether the degree of transitivity is in excess of a specified threshold value; the degree of transitivity is defined as the number of previous iterations of the algorithm for which the maximum of the correlation function between the chosen reference well and the well of the current iteration does not exceed the maximum of correlation function C(z) in point zmax.

### Claim 5 (depends on 3)

The computer-implemented method according to claim 3, characterized in that an additional test is used to establish a specified interval of values and to check whether there are wells that do not lie within this interval with the subsequent elimination of those wells.

### Claim 6

A computerized system for determining a position of a marker depth coordinate for a well W for construction of a geological model of a mineral deposit, computerized system comprising:
one or a plurality of processors;
input/output moduli (I/O);
a computer-readable medium, containing a program code, which, when executed, induces the processor or processors to implement the steps of:
1) determining a reference group of wells;
2) determining wells W located within the given neighborhood of the reference well group wherein the neighborhood does not exceed a distance R from any well in the reference group;
3) determining the correlation function C(z)and choosing for each well W found in a preceding step an appropriate well of the reference group with the maximum correlation coefficient and finding a point zmax corresponding to the reference group in well W;
4) checking the well W with the use of tests, and, if the check is successful, the choice of the well is assumed approved, and the depth corresponding to the maximum value of correlation zmax is taken to be the depth of the marker in well W;
5) adding the obtained well W to the reference well group; and
6) reiterating all steps of the method until no well W is found at the steps 1), 2), or 3).

### Claim 7 (depends on 6)

The computerized system according to claim 6, characterized in that a test is used to check whether the maximum of the correlation function C(z) in point zmax is in excess of a specified threshold value; the value of the maximum of the correlation function during the test being rounded upward to the nearest tenth, and if the value of the rounded correlation maximum is greater than or equal to the specified threshold value, the well is classified as not meeting the test conditions.

### Claim 8 (depends on 7)

The computerized system according to claim 7, characterized in that an additional test is used to check whether the degree of transitivity is in excess of a specified threshold value; the degree of transitivity being defined as the number of previous iterations of the algorithm for which the maximum of the correlation function between the chosen reference well and the well of the current iteration does not exceed the maximum of correlation function C(z) in point zmax.

### Claim 9 (depends on 8)

The computerized system according to claim 8, characterized in that an additional test is used to establish a specified interval of values and to check whether there are wells that do not lie within this interval for the subsequent elimination of those wells.

### Claim 10 (depends on 7)

The computerized system according to claim 7, characterized in that an additional test is used to establish a specified interval of values and to check whether there are wells that do not lie within this interval for the subsequent elimination of those wells.

### Claim 11

A non-transitory computer-readable medium embodying a asset of instructions, which, when executed by one or more processors, cause the one or more processors to perform a method for determining a position of a coordinate of marker depth in well W for construction of a geological model of a mineral deposit, the method comprising:
1) determining a reference group of wells;
2) determining wells W lying within a specified neighborhood of the reference group of wells where the neighborhood does not exceed the value of distance R from any well of the reference group;
3) determining a correlation function C(z), and choosing for each well W identified at the previous stage a well from the reference group with the maximal correlation coefficient and an appropriate point zmax in well W;
4) testing the well W, and, if the tests are successful, the choice of the well is approved and the depth zmax corresponding to the maximal correlation is taken as the marker depth at well W;
5) adding the well W thus found to the reference well group; and
6) reiterating all steps of the method until no well W is found at step 1) or steps 2) or 3).

### Claim 12 (depends on 11)

The non-transitory computer-readable medium according to claim 11, characterized in that a test is used to check whether the maximum of correlation function C(z) in point zmax is in excess of the specified threshold value; the value of the maximum of the correlation function during the test is rounded upward to the nearest tenth; if the value of the rounded correlation maximum is greater than or equal to the specified threshold value, the well is classified as not meeting the test conditions.

### Claim 13 (depends on 12)

The non-transitory computer-readable medium according to claim 12, characterized in that an additional test is used to check whether the degree of transitivity is in excess of a specified threshold value; the degree of transitivity is defined as the number of previous iterations of the algorithm for which the maximum of the correlation function between the chosen reference well and the well of the current iteration does not exceed the maximum of correlation function C(z) in point zmax.

### Claim 14 (depends on 12)

The non-transitory computer-readable medium according to claim 12, characterized in that an additional test is used to check whether the correlation quality coefficient is in excess of a specified threshold value; the coefficient of the quality of correlation being defined as a coefficient of deviation of the local maximum of correlation function, nearest in terms of value, from its largest local maximum in point zmax; if the value of the correlation quality coefficient is less than the specified threshold value, the well being tested is classified as not meeting the test conditions.

### Claim 15 (depends on 14)

The non-transitory computer-readable medium according to claim 14, characterized in that an additional test is used to establish a specified interval of values and to check whether there are wells that do not lie within this interval with the subsequent elimination of those wells.