CN107941840A - 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 PDF

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CN107941840A
CN107941840A CN201711487322.3A CN201711487322A CN107941840A CN 107941840 A CN107941840 A CN 107941840A CN 201711487322 A CN201711487322 A CN 201711487322A CN 107941840 A CN107941840 A CN 107941840A
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salinity
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CN107941840B (en
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任大忠
董凤娟
黄海
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Xian Shiyou University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • 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

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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 distilled water, the nuclear-magnetism T of 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；Calculate distilled water, the nuclear-magnetism T of different salinity water floodings2Spectral curve and X-axis surround T between area2Area under spectrum difference Δ Si；Establish distilled water, the nuclear-magnetism T of different salinity water floodings2The area and its T that spectrum is surrounded with X-axis2Area under spectrum difference data storehouse；Draw salinity and T2Area under spectrum difference Δ SiBetween fit correlation figure, establish relational expression therebetween, the present invention can symbolize occurrence status of the water flooding in different pore throat spaces, quick, accurately calculate formation water salinity.

Description

A kind of formation water salinity test method based on nuclear magnetic resonance technique
Technical field
It is more particularly to a kind of to be based on nuclear magnetic resonance the present invention is more particularly directed to the method that oil field asks for formation water salinity The formation water salinity test method of technology.
Background technology
The number containing inorganic salts represents that unit is generally represented with mg/L with salinity in water flooding.Study water flooding mineralising Degree problem has the mining site exploration and developments such as oil field water, coalfield water, geothermal energy resources important actual directive significance.At present, oil is determined The method of field formation water salinity can substantially be summarized as two kinds：
(1) formation water salinity is asked for 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, by region data and water sample chemically examine analysis formation water salinity.But due to well-log information by The influence of borehole condition and various factors, causes the formation water salinity or formation water resistivity calculated by well-log information There are certain error.
(2) formation water salinity is asked for 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 volume of accurate definite micropore, causes the formation water salinity precision of calculating relatively low.
The content of the invention
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, step are as follows：
Step 1: make the artificial core that porosity is 10%, its 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, saturation difference salinity water flooding is vacuumized, surveys core Magnetic resonance T2Spectrum；
Step 5: by distilled water, the nuclear-magnetism T of different salinity water flooding2Spectral 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: ask for 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 therebetween2Area under spectrum difference Δ Si；
Step 8: establish distilled water, the nuclear-magnetism T of different salinity water floodings2The area and its T that spectrum is surrounded with X-axis2Spectrum Difference in areas database；
Step 9: draw salinity and difference in areas Δ SiBetween fit correlation figure, establish relational expression therebetween
Y=1753.1 Δs S-44737
Wherein, Δ S represents 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 represents simulated formation water salinity, mg/L.
Rock sample on the basis of the artificial core that the porosity is 10%, is divided into some parallel rock samples；One piece of rock core desalinization of soil by flooding or leaching is dried Saturation distilled water is vacuumized after dry, saturation difference salinity water flooding is vacuumized after remaining rock core desalinization of soil by flooding or leaching drying.
The formation water salinity has popularity, suitable for different oil fields, stratum；The salinity tool of the distilled water 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, when the time is 5 small.
T is calculated described in step 82Area under spectrum difference Δ SiRealized 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, establishes salinity and T2Spectrum 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) method of formation testing water salinity provided by the invention is the characteristics of being based on nuclear magnetic resonance technique, fully to examine Occurrence status of the different salinity water floodings in different pore throat spaces are considered, suitable for the survey of different type stratum formation water salinity Examination, determines stratum connate water salinity.
(3) present invention using porosity as the parallel sample of 10% artificial core as benchmark rock sample to different salinity stratum Water, takes into full account the applicability of test result, is verified by a large amount of laboratory experiments, shows remarkable result.
Brief description of the drawings
Fig. 1 is the method for the present invention flow chart.
Fig. 2 is distilled water, the nuclear magnetic resonance T of different salinity water floodings2Spectrum.
Fig. 3 influences water flooding in different pore throat spaces occurrence status for salinity.
Fig. 4 is salinity and T2Fit correlation figure between area under spectrum difference.
Embodiment
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: make the artificial core that porosity is 10%, its a diameter of 2.5cm, length 5cm；
Step 2: preparation experiment distilled water, different salinity (15000mg/L, 45000mg/L and 75000mg/L) moulds Intend water flooding；
Step 3: rock core desalinization of soil by flooding or leaching drying is placed in saturation device, vacuumize, when the time is 5 small, distill its saturation 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, when the time is 5 small, make its quilt 15000mg/L simulated formation water saturations, survey nuclear magnetic resonance T2Spectrum；
(2) rock core desalinization of soil by flooding or leaching drying is placed in saturation device, vacuumized, when the time is 5 small, make it by 45000mg/L Simulated formation water saturation, surveys nuclear magnetic resonance T2Spectrum；
(3) rock core desalinization of soil by flooding or leaching drying is placed in saturation device, vacuumized, when the time is 5 small, make it by 75000mg/L Simulated formation water saturation, surveys nuclear magnetic resonance T2Spectrum；
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: ask for 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 therebetween2Spectrum Difference in areas Δ Si；
(1) the nuclear-magnetism T of distilled water is asked for2The area S that spectrum is surrounded with X-axis；
(2) the nuclear-magnetism T that salinity is 15000mg/L simulated formation water is asked for2The 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 asked for2The 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 asked for2The 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: establish 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 storehouse；
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: draw salinity (15000mg/L, 45000mg/L and 75000mg/L) and T2Area under spectrum difference Δ SiBetween Fit correlation figure, establishes relational expression therebetween；As shown in Figure 4：
Y=1753.1 Δs S-44737
Correlation system R2=0.9887
Wherein, Δ S represents 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 represents simulated formation water salinity, mg/L.

Claims (4)

1. a kind of formation water salinity test method based on nuclear magnetic resonance technique, it is characterised in that step is as follows：
Step 1: make the artificial core that porosity is 10%, its 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 T2Spectrum；
Step 4: rock core desalinization of soil by flooding or leaching drying is placed in saturation device, saturation difference salinity water flooding is vacuumized, nuclear-magnetism is surveyed and is total to Shake T2Spectrum；
Step 5: by distilled water, the nuclear-magnetism T of different salinity water flooding2Spectral 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 is in 0.01 μm of saturation state, 0.1 μm, 1.0 μ M, the distribution curve under 10.0 μm are plotted on same figure, and analysis salinity is to water flooding in different pore throat spaces occurrence status Influence；
Step 7: ask for 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 therebetween2Area under spectrum difference Δ Si；
Step 8: establish distilled water, the nuclear-magnetism T of different salinity water floodings2The area and its T that spectrum is surrounded with X-axis2Area under spectrum Difference data storehouse；
Step 9: draw salinity and difference in areas Δ SiBetween fit correlation figure, establish relational expression therebetween
Y=1753.1 Δs S-44737
Wherein, Δ S represents simulated formation hydromagnetic T2The area and distilled water nuclear-magnetism T that spectrum is surrounded with X-axis2What spectrum was surrounded with X-axis Difference between area；Y represents 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, its feature exist In rock sample on the basis of the artificial core that the porosity is 10%, is divided into some parallel rock samples；Taken out after one piece of rock core desalinization of soil by flooding or leaching drying Vacuum saturation distilled water, saturation difference salinity water flooding is 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, its feature exist In, it is described that artificial core desalinization of soil by flooding or leaching drying is placed in saturation device, saturation distilled water, different salinity water floodings are vacuumized, When time is 5 small.
4. a kind of formation water salinity test method based on nuclear magnetic resonance technique according to claim 1, its feature exist In calculating T described in step 82Area under spectrum difference Δ SiRealized 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 is steaming The nuclear-magnetism T of distilled water2The area that spectrum is surrounded with X-axis.
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Publication number Priority date Publication date Assignee Title
CN109142135A (en) * 2018-09-29 2019-01-04 杨梓艺 A method of the salinity of measurement shale pore water
CN109142135B (en) * 2018-09-29 2019-10-25 杨梓艺 A method of the salinity of measurement shale pore water

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