CN111427095B - Method for identifying fluid properties by applying nuclear magnetic resonance quadrilateral interpretation chart - Google Patents
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- 238000005481 NMR spectroscopy Methods 0.000 title claims abstract description 61
- 239000012530 fluid Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 238000007405 data analysis Methods 0.000 claims abstract description 12
- 238000004458 analytical method Methods 0.000 claims description 26
- 238000012360 testing method Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 abstract description 7
- 238000011160 research Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
- G01V3/32—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with electron or nuclear magnetic resonance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/38—Processing data, e.g. for analysis, for interpretation, for correction
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A90/30—Assessment of water resources
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Abstract
The invention discloses a method for identifying fluid properties by applying a nuclear magnetic resonance quadrilateral interpretation chart, which relates to the technical field of interpretation and evaluation of oil and gas geological exploration logging, and comprises the following steps: original parameter selection: four parameters for creating an interpretation plate were chosen, respectively: are respectively
、
S Bound water 、
S Movable water 、
S Qi (Qi) (ii) a Establishing a plate frame: the interpretation plate is a quadrangular plate to
The scale range of the value can be taken as a horizontal axis,
S Qi (Qi) The scale range of which the value can be taken is a second horizontal axis, and a horizontal coordinate is established so as to
S Bound water The scale range of the value can be taken as the vertical axis,
S Movable water The scale range of the value can be taken as a second vertical axis, and a vertical coordinate, two horizontal coordinates and two horizontal coordinates are establishedIntersecting and enclosing the vertical coordinates to form a quadrilateral interpretation plate; a data analysis step; establishing a nuclear magnetic resonance quadrilateral explanation plate; interpreting a nuclear magnetic resonance quadrilateral interpretation chart; the method can efficiently and conveniently identify the properties of the sample fluid, and lays a foundation for reservoir fluid property identification research.
Description
Technical Field
The invention relates to the technical field of interpretation and evaluation of oil and gas geological exploration logging, in particular to a nuclear magnetic resonance logging interpretation and evaluation method mainly suitable for a natural gas reservoir.
Background
Natural gas reservoir fluid property identification is an important task for guiding oil and gas exploration and development. In the drilling process, the fluid properties are mostly identified by adopting a logging interpretation technology, but in the prior art, logging parameters such as gas logging, drilling fluid and the like are mainly adopted for relevant analysis, and the parameters are easily influenced by uncertain factors such as working conditions, climate and the like, so that the logging interpretation is complex, and the fluid properties are difficult to identify effectively. The technology can quantitatively detect parameters such as sample porosity, fluid saturation and the like by analyzing the relaxation phenomenon of hydrogen atoms in a rock sample, and can effectively identify the fluid property.
Regarding the application of nuclear magnetic resonance logging parameters, the existing methods mostly directly adopt nuclear magnetic analysis parameters for relevant understanding, such as a geological logging interpretation and evaluation method for oil drilling exploration disclosed in chinese patent literature with publication number CN101183154A and publication date of 2008, 5, month and 21. Some methods perform fluid property identification after calculating the original parameters, for example, a method for performing reservoir evaluation by using nuclear magnetic resonance logging interpretation parameters disclosed in chinese patent documents with publication number CN101750633A and publication date 2009, 12, month and 15, a method for performing reservoir evaluation by using a nuclear magnetic resonance logging interpretation chart disclosed in chinese patent documents with publication number CN101718878A and publication date, 2009, 12, month and 15. Wherein: CN101718878A selects two parameters of oil saturation So and movable fluid saturation BVM, obtains M1 parameter by using formula M1= BVM So, and establishes phi-M1 interpretation plate; calculating a movable oil saturation Smo parameter by using a formula Smo = BVM-Smw, obtaining an M2 parameter by using a formula M2= Smo phi, and establishing a So-M2 explanation plate; carrying out visual evaluation on the reservoir fluid category by adopting two interpretation charts; by adopting the method, the problems that the evaluated reservoir can not produce fluid and produce fluid with certain properties can be solved, and the oil-containing condition of the reservoir and the quantity of produced oil can also be solved. The method eliminates the factors of uncertain interpretation parameters caused by factors such as blocks, horizons, oil-containing characteristics and the like, and has universal applicability in the clastic rock oil-containing layer system.
However, in the prior art represented by the patent document CN101718878A, two directly measured parameters in nuclear magnetic resonance or indirectly measured parameters obtained by formula calculation are mostly used to perform related interpretation work, however, in the art, porosity, gas saturation, irreducible water saturation and movable water saturation measured by a natural gas reservoir nuclear magnetic resonance logging are quantitative parameters of reservoir physical properties and fluid properties, and each of the parameters has very important geological significance.
Disclosure of Invention
The invention aims to provide a method for identifying fluid properties by applying a nuclear magnetic resonance quadrilateral interpretation plate aiming at the defects and shortcomings of the prior art, and solves the technical problem that the identification accuracy is still not high enough due to the fact that the prior art only adopts two directly measured parameters or indirectly measured parameters obtained after formula calculation to identify the fluid properties.
The invention is realized by adopting the following technical scheme:
a method for identifying fluid properties by using a nuclear magnetic resonance quadrilateral interpretation plate is characterized in that:
original parameter selection: four parameters for creating an interpretation plate were chosen, respectively: are respectively
、
S Bound water 、
S Movable water 、
S Qi (Qi) ；
Wherein:
sample porosity measured for nmr logging, unit: percent;
S bound water Sample irreducible water saturation measured for nmr logging, unit: percent;
S movable water Is nuclear magnetic resonanceSample mobile water saturation for logging measurements, unit: percent;
S qi (Qi) Measuring the gas saturation of a sample for nuclear magnetic resonance logging, unit: percent;
establishing a plate frame: the interpretation plate is a quadrangular plate to
The scale range of the value can be taken as a horizontal axis,
S Qi (Qi) The scale range of which the value can be taken is a second horizontal axis, and a horizontal coordinate is established so as to
S Bound water The scale range of the value is a vertical axis,
S Movable water The value scale range can be taken as a second longitudinal axis, a vertical coordinate is established, and the two horizontal coordinates and the two vertical coordinates are intersected and enclosed to form a quadrilateral interpretation plate;
and (3) data analysis: taking a nuclear magnetic resonance sample of a certain work area as an example, obtaining the sample
、
S Bound water 、
S Movable water 、
S Qi (Qi) Are respectively marked on the horizontal axis one
The value is set as point A; is marked on the longitudinal axis one
S Bound water Setting the value as a B point; on the second horizontal axis
S Qi (Qi) The value is set as point C; on the second longitudinal axis
S Movable water The value is set as point D; connecting the AC and the BD to obtain two broken lines which intersect at a point E, wherein the point E is an analysis point of the quadrilateral interpretation plate;
establishing a nuclear magnetic resonance quadrilateral interpretation plate: obtaining analysis points of a plurality of samples of nuclear magnetic resonance of a certain work area in a data analysis step mode, dividing a fluid property area according to specific positions of the analysis points of different oil testing results in a nuclear magnetic resonance quadrilateral explanation plate, and establishing the nuclear magnetic resonance quadrilateral explanation plate;
interpretation of nuclear magnetic resonance quadrilateral plates: and calculating analysis points of the porosity, the gas saturation, the bound water and the movable water of the nuclear magnetic resonance analysis of the sample according to the data analysis steps, then placing the analysis points in a nuclear magnetic resonance quadrilateral explanation plate, and judging the fluid property in the sample according to the area where the analysis points are located.
And the scale ranges of the horizontal coordinate and the vertical coordinate control the maximum and minimum scale values of the coordinates according to the actual conditions of the work area.
The coordinates are common coordinates or logarithmic coordinates.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with the prior art represented by the patent document with the publication number of CN101718878A, the method fully applies nuclear magnetic resonance logging parameters, places four parameters of porosity, gas saturation, irreducible water saturation and movable water saturation in the same explanation plate to explain the fluid properties, and greatly improves the explanation accuracy compared with the prior art that two directly measured parameters in nuclear magnetic resonance or indirectly measured parameters obtained through formula calculation are adopted to carry out related explanation work.
2. The analysis point of the method is determined by the intersecting line of the four measurement parameters of nuclear magnetic resonance as described in data analysis, has definite geological significance, and can efficiently judge the nuclear magnetic resonance parameter characteristics of the fluid in the work area by directly recognizing the analysis point.
In conclusion, the method provided by the invention is relatively comprehensively applied to the nuclear magnetic resonance logging parameters, can efficiently and conveniently identify the properties of the sample fluid, and lays a foundation for reservoir fluid property identification research.
Drawings
The invention will be described in further detail with reference to the following description taken in conjunction with the accompanying drawings and detailed description, in which:
FIG. 1 is a schematic diagram of a nuclear magnetic resonance quadrilateral interpretation plate frame;
FIG. 2 is a diagram of the calculation of the interpretation parameters of a quadrilateral NMR chart;
FIG. 3 is a schematic diagram of an explanatory chart of a NMR quadrilateral created in a work area;
FIG. 4 is a diagram of a quadrilateral interpretation chart of NMR of a sample.
Detailed Description
Example 1
A method for identifying fluid properties by applying a nuclear magnetic resonance quadrilateral interpretation plate comprises the following steps:
original parameter selection: four parameters for creating an interpretation plate were chosen, respectively: are respectively
、
S Bound water 、
S Movable water 、
S Qi (Qi) ；
Wherein:
sample porosity measured for nmr logging, unit: %;
S bound water Sample irreducible water saturation measured for nuclear magnetic resonance logging, units: %;
S movable water Sample mobile water saturation measured for nmr logging, unit: %;
S qi (Qi) Measuring the gas saturation of a sample for nuclear magnetic resonance logging, unit: %;
establishing a plate frame: the interpretation plate is a quadrangular plate to
The scale range of the value is a horizontal axis,
S Qi (Qi) The scale range of which the value can be taken is a second horizontal axis, and a horizontal coordinate is established so as to
S Bound water The scale range of the value can be taken as the vertical axis,
S Movable water The value scale range can be taken as a second longitudinal axis, a vertical coordinate is established, and the two horizontal coordinates and the two vertical coordinates are intersected and enclosed to form a quadrilateral interpretation plate; the scale ranges of the abscissa and the ordinate can control the maximum scale value and the minimum scale value of the coordinate according to the actual condition of the work area (as shown in figure 1);
and (3) data analysis: taking a nuclear magnetic resonance sample of a certain work area as an example, obtaining the sample
、
S Bound water 、
S Movable water 、
S Qi (Qi) Are respectively marked on the horizontal axis one
The value is set as point A; on the longitudinal axis one
S Bound water Setting the value as a B point; on the second transverse axis
S Qi (Qi) The value is set as point C; on the second longitudinal axis
S Movable water The value is set as point D; connecting the AC and the BD to obtain two broken lines which intersect at a point E, wherein the point E is an analysis point of the quadrilateral interpretation plate; A. the positions of the points B, C, D and E in the plate are shown in FIG. 2;
establishing a nuclear magnetic resonance quadrilateral interpretation plate: according to the sample porosity, irreducible water saturation, movable water saturation and gas saturation measured by nuclear magnetic resonance in a work area, combining with oil testing results, calculating relevant analysis points according to data analysis steps, and then pointing the calculated relevant analysis points in a nuclear magnetic resonance quadrilateral plate, dividing fluid property areas according to specific positions of the analysis points of different oil testing results in the nuclear magnetic resonance quadrilateral interpretation plate, and establishing a nuclear magnetic resonance quadrilateral interpretation plate, wherein the horizontal and vertical coordinate scales of the plate can be adjusted according to the size of actual data points in the work area (as shown in figure 3);
interpretation of nuclear magnetic resonance quadrilateral plates: and calculating analysis points of the porosity, the gas saturation, the bound water and the movable water of the nuclear magnetic resonance analysis of the sample according to the data analysis steps, then placing the analysis points in a nuclear magnetic resonance quadrilateral explanation plate, and judging the fluid property in the sample according to the area where the analysis points are located. (see fig. 4)
Example 2 (application example)
1. And obtaining a plurality of nuclear magnetic resonance samples with oil testing results in a certain work area, and respectively counting parameters of nuclear magnetic resonance porosity, gas saturation, irreducible water saturation, movable water saturation, oil testing results and the like of the respective samples.
2. The nuclear magnetic resonance quadrilateral interpretation plate is established according to four steps of original parameter selection, plate frame establishment, data analysis and nuclear magnetic resonance quadrilateral interpretation plate establishment. The maximum or minimum value of the abscissa or the ordinate can be adjusted according to the actual conditions of the work area, for example, the maximum value of the low-permeability reservoir can be adjusted to 20, and the maximum value of the high permeability can be adjusted to 40.
3. The sample to be analyzed is placed into the nuclear magnetic resonance quadrilateral interpretation chart of the work area according to the nuclear magnetic resonance quadrilateral interpretation chart interpretation steps of the invention content, and then the fluid property of the sample can be identified.
Claims (3)
1. A method for identifying fluid properties by applying a nuclear magnetic resonance quadrilateral interpretation plate, characterized in that:
original parameter selection: four parameters for creating an interpretation plate were chosen, respectively:
、
、
、
；
wherein:
sample porosity measured for nmr logging, unit: %;
establishing a plate frame: the interpretation plate is a quadrangular plate to
The scale range of the value is a horizontal axis,
The scale range of which the value can be taken is a second horizontal axis, and a horizontal coordinate is established so as to
The scale range of the value can be taken as the vertical axis,
The value scale range can be taken as a second longitudinal axis, a vertical coordinate is established, and the two horizontal coordinates and the two vertical coordinates are intersected and enclosed to form a quadrilateral interpretation plate;
and (3) data analysis: taking a nuclear magnetic resonance sample of a certain work area as an example, obtaining the sample
、
、
、
Are respectively marked on the horizontal axis one
The value is set as point A; on the longitudinal axis one
Setting the value as a B point; on the second transverse axis
Setting the value as a point C; on the second longitudinal axis
The value is set as point D; connecting the AC and the BD to obtain two broken lines which intersect at a point E, wherein the point E is an analysis point of the quadrilateral interpretation plate;
establishing a nuclear magnetic resonance quadrilateral interpretation plate: obtaining analysis points of a plurality of samples of nuclear magnetic resonance of a certain work area in a data analysis step mode, dividing a fluid property area according to specific positions of the analysis points of different oil testing results in a nuclear magnetic resonance quadrilateral explanation plate, and establishing the nuclear magnetic resonance quadrilateral explanation plate;
interpretation of nuclear magnetic resonance quadrilateral interpretation charts: and calculating analysis points of the porosity, the gas saturation, the bound water and the movable water of the nuclear magnetic resonance analysis of the sample according to the data analysis steps, then placing the analysis points in a nuclear magnetic resonance quadrilateral explanation plate, and judging the fluid property in the sample according to the area where the analysis points are located.
2. The method of claim 1, wherein the fluid property is identified using a nmr quadrilateral interpretation plate, the nmr quadrilateral interpretation plate comprising: and the scale ranges of the horizontal coordinate and the vertical coordinate control the maximum and minimum scale values of the coordinates according to the actual conditions of the work area.
3. The method for identifying the properties of the fluid by using the NMR quadrilateral interpretation plate of claim 1, wherein the method comprises the following steps: the coordinates are normal coordinates or logarithmic coordinates.
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