CN107941840B - A kind of formation water salinity test method based on nuclear magnetic resonance technique - Google Patents
A kind of formation water salinity test method based on nuclear magnetic resonance technique Download PDFInfo
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- CN107941840B CN107941840B CN201711487322.3A CN201711487322A CN107941840B CN 107941840 B CN107941840 B CN 107941840B CN 201711487322 A CN201711487322 A CN 201711487322A CN 107941840 B CN107941840 B CN 107941840B
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
A kind of formation water salinity test method based on nuclear magnetic resonance technique, by distilled water, the nuclear-magnetism T of different salinity water floodings2Spectral curve is plotted on same figure, establishes standard plate；Draw the nuclear-magnetism T of distilled water, different salinity simulated formation water2The distribution curve composed under 0.01 μm, 0.1 μm, 1.0 μm, 10.0 μm of saturation state is plotted on same figure, and analysis salinity influences water flooding in different pore throat spaces occurrence status；The nuclear-magnetism T of calculating distilled water, different salinity water floodings2T between spectral curve and X-axis institute surround the area2Area under spectrum difference Δ Si；Establish distilled water, different salinity water flooding nuclear-magnetism T2The area and its T that spectrum is surrounded with X-axis2Area under spectrum difference data library；Draw salinity and T2Area under spectrum difference Δ SiBetween fit correlation figure, establish relational expression between the two, the present invention can symbolize water flooding in the occurrence status in different pore throat spaces, quickly, accurately calculate formation water salinity.
Description
Technical field
The present invention is more particularly directed to the methods that oil field seeks formation water salinity, more particularly to a kind of to be based on nuclear magnetic resonance
The formation water salinity test method of technology.
Background technology
The number containing inorganic salts indicates that unit is generally indicated with mg/L with salinity in water flooding.Study water flooding mineralising
Degree problem has the mining sites exploration and developments such as oil field water, coalfield water, geothermal energy resources important practical directive significance.Currently, determining oil
The method of field formation water salinity can substantially be summarized as two kinds：
(1) formation water salinity is sought using well-log information, including this well is determined according to offset well formation water salinity data
Formation water salinity, determine with Archie formula formation water resistivity or salinity, calculate stratum using related logging curve
Water resistance rate or salinity chemically examine analysis formation water salinity by region data and water sample.But due to well-log information by
The influence of borehole condition and various factors causes the formation water salinity or formation water resistivity that are calculated by well-log information
There are certain errors.
(2) formation water salinity is sought by rock core.The test method step is various and is related to rock pore volume really
Fixed, for compact reservoir, water flooding greatly or is all distributed in micropore, and existing rock pore volume
Measuring technology is but difficult the accurate volume for determining micropore, causes the formation water salinity precision calculated relatively low.
Invention content
To solve drawbacks described above existing in the prior art, the present invention provides a kind of water flooding based on nuclear magnetic resonance technique
Salinity test method, it is therefore intended that quickly, accurately calculate formation water salinity, and water flooding can be symbolized in different pore throats
The occurrence status in space.
In order to achieve the above object, the technical scheme is that：
A kind of formation water salinity test method based on nuclear magnetic resonance technique, steps are as follows：
Step 1: the artificial core that porosity is 10% is made, a diameter of 2.5cm, length 5cm；
Step 2: preparation experiment distilled water, different salinity simulated formation water；
Step 3: rock core desalinization of soil by flooding or leaching drying is placed in saturation device, saturation distilled water is vacuumized, surveys nuclear magnetic resonance T2
Spectrum；
Step 4: rock core desalinization of soil by flooding or leaching drying is placed in saturation device, the different salinity water floodings of saturation are vacuumized, core is surveyed
Magnetic resonance T2Spectrum；
Step 5: by distilled water, the nuclear-magnetism T of different salinity water floodings2Spectral curve is plotted on same figure, establishes mark
Quasi- plate；
Step 6: by distilled water, the nuclear-magnetism T of different salinity simulated formation water2Spectrum is in 0.01 μm of saturation state, 0.1 μm,
Distribution curve under 1.0 μm, 10.0 μm is plotted on same figure, and analysis salinity is to water flooding in different pore throat spaces preservation
State influences；
Step 7: seeking the nuclear-magnetism T of different salinity simulated formation water2The area S that spectrum is surrounded with X-axisi, distilled water
Nuclear-magnetism T2The area S that spectrum is surrounded with X-axis, and calculate T between the two2Area under spectrum difference Δ Si；
Step 8: establish distilled water, different salinity water flooding nuclear-magnetism T2The area and its T that spectrum is surrounded with X-axis2Spectrum
Difference in areas database；
Step 9: drawing salinity and difference in areas Δ SiBetween fit correlation figure, establish relational expression between the two
Y=1753.1 Δs S-44737
Wherein, Δ S indicates simulated formation hydromagnetic T2The area and distilled water nuclear-magnetism T that spectrum is surrounded with X-axis2Spectrum is wrapped with X-axis
Difference between the area enclosed；Y indicates simulated formation water salinity, mg/L.
Rock sample on the basis of the artificial core that the porosity is 10%, is divided into several parallel rock samples；One piece of rock core desalinization of soil by flooding or leaching is dried
Saturation distilled water is vacuumized after dry, the different salinity water floodings of saturation are vacuumized after remaining rock core desalinization of soil by flooding or leaching drying.
The formation water salinity has popularity, is suitable for different oil fields, stratum；The salinity of the distilled water has
There is uniqueness, as benchmark liquid.
It is described that artificial core desalinization of soil by flooding or leaching drying is placed in saturation device, with vacuumizing saturation distilled water, different salinities
Layer water, time are 5 hours.
T is calculated described in step 82Area under spectrum difference Δ SiIt is realized by following formula；
ΔSi=S-Si
In formula：SiFor the nuclear-magnetism T of different salinity water floodings2The area that spectrum is surrounded with X-axis, i=1,2,3 ..., n.；S
For the nuclear-magnetism T of distilled water2The area that spectrum is surrounded with X-axis.
The nuclear-magnetism T of distilled water, different salinity water floodings2Compose (0.01 μm, 0.1 μm, 1.0 μm, 10.0 μm) distribution curve
Be plotted on same figure, illustrate salinity to water flooding the occurrence status in different pore throat spaces influence.
Establish salinity and T2Area under spectrum difference Δ SiBetween fit correlation formula, realize using nuclear magnetic resonance technique test ground
Layer water salinity.
Compared with prior art, the present invention has the following advantages：
(1) present invention is by drawing distilled water, different salinity water flooding T2Standard plate is composed, salinity and T are established2Spectrum
Difference in areas Δ SiBetween fit correlation formula, contribute to the standardization of formation water salinity detection method, for formation water salinity survey
The raising of examination precision provides technical support.
(2) the characteristics of method of formation testing water salinity provided by the invention is based on nuclear magnetic resonance technique, fully examines
Different salinity water floodings are considered in the occurrence status in different pore throat spaces, are suitable for the survey of different type stratum formation water salinity
Examination, determines stratum connate water salinity.
(3) present invention using porosity be 10% artificial core parallel sample as benchmark rock sample to different salinity stratum
Water fully considers the applicability of test result, is verified by a large amount of laboratory experiments, shows remarkable result.
Description of the drawings
Fig. 1 is the method for the present invention flow chart.
Fig. 2 be distilled water, different salinity water flooding nuclear magnetic resonance T2Spectrum.
Fig. 3, which is salinity, influences water flooding in different pore throat spaces occurrence status.
Fig. 4 is salinity and T2Fit correlation figure between area under spectrum difference.
Specific implementation mode
The invention will now be described in detail with reference to the accompanying drawings.
A kind of formation water salinity test method based on nuclear magnetic resonance technique of the present invention, as shown in Figure 1, including following steps
Suddenly：
Step 1: the artificial core that porosity is 10% is made, a diameter of 2.5cm, length 5cm；
Step 2: preparation experiment distilled water, different salinity (15000mg/L, 45000mg/L and 75000mg/L) moulds
Quasi- water flooding；
Step 3: rock core desalinization of soil by flooding or leaching drying is placed in saturation device, vacuumize, the time is 5 hours, makes its saturation distillation
Water surveys nuclear magnetic resonance T2Spectrum；
Step 4: rock core desalinization of soil by flooding or leaching drying is placed in saturation device by (1), vacuumize, the time is 5 hours, makes its quilt
Nuclear magnetic resonance T is surveyed in 15000mg/L simulated formation water saturations2Spectrum；
(2) rock core desalinization of soil by flooding or leaching drying is placed in saturation device, is vacuumized, the time is 5 hours, makes it by 45000mg/L
Nuclear magnetic resonance T is surveyed in simulated formation water saturation2Spectrum；
(3) rock core desalinization of soil by flooding or leaching drying is placed in saturation device, is vacuumized, the time is 5 hours, makes it by 75000mg/L
Nuclear magnetic resonance T is surveyed in simulated formation water saturation2Spectrum；
Step 5: by distilled water, different salinity (15000mg/L, 45000mg/L and 75000mg/L) simulated formation water
Nuclear-magnetism T2Spectral curve is plotted on same figure, establishes standard plate；As shown in Figure 2：
Step 6: by distilled water, different salinity (15000mg/L, 45000mg/L and 75000mg/L) simulated formation water
Nuclear-magnetism T2The distribution curve composed under 0.01 μm, 0.1 μm, 1.0 μm, 10.0 μm of saturation state is plotted on same figure, point
Analysing salinity influences water flooding in different pore throat spaces occurrence status；As shown in Figure 3：
Step 7: seeking the nuclear-magnetism of different salinity (15000mg/L, 45000mg/L and 75000mg/L) simulated formation water
T2The area S that spectrum is surrounded with X-axisi, distilled water nuclear-magnetism T2The area S that spectrum is surrounded with X-axis, and calculate T between the two2Spectrum
Difference in areas Δ Si；
(1) the nuclear-magnetism T of distilled water is sought2The area S that spectrum is surrounded with X-axis；
(2) the nuclear-magnetism T that salinity is 15000mg/L simulated formation water is sought2The area S that spectrum is surrounded with X-axis1, and calculate
Itself and S (the nuclear-magnetism T of distilled water2Spectrum and the area that is surrounded of X-axis) between T2Area under spectrum difference Δ S1；
(3) the nuclear-magnetism T that salinity is 45000mg/L simulated formation water is sought2The area S that spectrum is surrounded with X-axis2, and calculate
Itself and S (the nuclear-magnetism T of distilled water2Spectrum and the area that is surrounded of X-axis) between T2Area under spectrum difference Δ S2；
(4) the nuclear-magnetism T that salinity is 75000mg/L simulated formation water is sought2The area S that spectrum is surrounded with X-axis3, and calculate
Itself and S (the nuclear-magnetism T of distilled water2Spectrum and the area that is surrounded of X-axis) between T2Area under spectrum difference Δ S3。
Step 8: establishing distilled water, different salinity (15000mg/L, 45000mg/L and 75000mg/L) simulated formations
The nuclear-magnetism T of water2The area and its T that spectrum is surrounded with X-axis2Area under spectrum difference data library；
The nuclear-magnetism T of 1 distilled water of table, different salinity water floodings2The area and difference in areas database that spectrum is surrounded with X-axis
Step 9: drawing salinity (15000mg/L, 45000mg/L and 75000mg/L) and T2Area under spectrum difference Δ SiBetween
Fit correlation figure establishes relational expression between the two；As shown in Figure 4：
Y=1753.1 Δs S-44737
Correlation system R2=0.9887
Wherein, Δ S indicates simulated formation hydromagnetic T2The area and distilled water nuclear-magnetism T that spectrum is surrounded with X-axis2Spectrum is wrapped with X-axis
Difference between the area enclosed；Y indicates simulated formation water salinity, mg/L.
Claims (3)
1. a kind of formation water salinity test method based on nuclear magnetic resonance technique, which is characterized in that steps are as follows：
Step 1: the artificial core that porosity is 10% is made, a diameter of 2.5cm, length 5cm；
Step 2: preparation experiment distilled water, different salinity simulated formation water；
Step 3: rock core desalinization of soil by flooding or leaching drying is placed in saturation device, saturation distilled water is vacuumized, nuclear magnetic resonance T is measured2Spectrum；
Step 4: rock core desalinization of soil by flooding or leaching drying is placed in saturation device, the different salinity water floodings of saturation are vacuumized, nuclear-magnetism is measured
Resonate T2Spectrum；
Step 5: by distilled water, the nuclear-magnetism T of different salinity water floodings2Spectral curve is plotted on same figure, establishes standard drawing
Version；
Step 6: by distilled water, the nuclear-magnetism T of different salinity simulated formation water2Spectrum pore throat radius be 0.01 μm, 0.1 μm, 1.0
μm, the distribution curve under 10.0 μm of saturation states is plotted on same figure, and analysis salinity is to water flooding in different pore throats sky
Between occurrence status influence；
Step 7: seeking the nuclear-magnetism T of different salinity simulated formation water2The area S that spectrum is surrounded with X-axisi, distilled water nuclear-magnetism
T2The area S that spectrum is surrounded with X-axis, and calculate T between the two2Area under spectrum difference Δ Si；
Step 8: establish distilled water, different salinity water flooding nuclear-magnetism T2The area and its T that spectrum is surrounded with X-axis2Area under spectrum
Difference data library；
Step 9: drawing salinity and difference in areas Δ SiBetween fit correlation figure, establish relational expression between the two
Y=1753.1 Δs S-44737
Wherein, Δ S indicates simulated formation water nuclear-magnetism T2The area and distilled water nuclear-magnetism T that spectrum is surrounded with X-axis2Spectrum is surrounded with X-axis
Area between difference；Y indicates simulated formation water salinity, mg/L.
2. a kind of formation water salinity test method based on nuclear magnetic resonance technique according to claim 1, feature exist
In rock sample on the basis of the artificial core that the porosity is 10% is divided into several parallel rock samples；It is taken out after one piece of rock core desalinization of soil by flooding or leaching drying
Vacuum is saturated distilled water, and the different salinity water floodings of saturation are vacuumized after remaining rock core desalinization of soil by flooding or leaching drying.
3. a kind of formation water salinity test method based on nuclear magnetic resonance technique according to claim 1, feature exist
In, artificial core desalinization of soil by flooding or leaching drying is placed in saturation device, saturation distilled water, different salinity water floodings are vacuumized,
Time is 5 hours.
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| CN102944571A (en) * | 2012-10-17 | 2013-02-27 | 中国地质大学（北京） | Method for measuring content of different state water in coal |
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