CN109100279A - For CO2Method for determining three-dimensional pore structure of rock by water-rock reaction - Google Patents
For CO2Method for determining three-dimensional pore structure of rock by water-rock reaction Download PDFInfo
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- CN109100279A CN109100279A CN201810978740.0A CN201810978740A CN109100279A CN 109100279 A CN109100279 A CN 109100279A CN 201810978740 A CN201810978740 A CN 201810978740A CN 109100279 A CN109100279 A CN 109100279A
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- 239000011435 rock Substances 0.000 title claims abstract description 245
- 239000011148 porous material Substances 0.000 title claims abstract description 44
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 13
- 238000002474 experimental method Methods 0.000 claims abstract description 109
- 238000000034 method Methods 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 230000003993 interaction Effects 0.000 claims description 41
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 33
- 238000002591 computed tomography Methods 0.000 claims description 18
- 239000004575 stone Substances 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 3
- 238000005194 fractionation Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 5
- 238000005553 drilling Methods 0.000 abstract 3
- 239000003054 catalyst Substances 0.000 abstract 1
- 238000011160 research Methods 0.000 description 14
- 238000005260 corrosion Methods 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 239000001307 helium Substances 0.000 description 4
- 229910052734 helium Inorganic materials 0.000 description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000012512 characterization method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000002070 germicidal effect Effects 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
- G01N15/0893—Investigating volume, surface area, size or distribution of pores; Porosimetry by measuring weight or volume of sorbed fluid, e.g. B.E.T. method
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Abstract
The invention providesSupply a catalyst for CO2The method for determining the three-dimensional pore structure of the rock by water-rock reaction comprises the following steps: dividing the collected rock columnar sample into a first rock sample and a second rock sample; determining the porosity of the first rock sample before the experiment, obtaining a plurality of micro-drilling samples of the second rock sample, and determining the volume proportion of each micro-drilling sample; determining the porosity of the second rock sample before the experiment; resetting each micro-drilling sample on a corresponding position of a second rock sample, and combining and wrapping the first rock sample and the second rock sample; subjecting the wrapped sample to CO2Performing a water rock reaction experiment; determining the porosity of the first rock sample after the experiment, and determining the porosity of the second rock sample after the experiment; determining the pore change characteristics of the first rock sample and determining the pore change characteristics of the second rock sample; and determining the pore structure evolution characteristics of the rock columnar samples by taking the pore change characteristics of the first rock sample as constraints according to the pore change characteristics of the second rock sample.
Description
Technical field
The present invention relates to rock pore structures to measure field, espespecially a kind of to be used for CO2The rock three-dimensional pore space of Water-rock interaction
Structure determination method.
Background technique
In today of global economy great development, with CO2Global pass is caused for influence of the greenhouse gases to environment of representative
How note, effectively carry out CO2Emission reduction, the CO discharged2How effectively to be buried and is asked using having become the important of attention from government
Topic.By CO2It injects in the oil reservoir of low porosity permeability, on the one hand reduces CO2On the other hand influence to atmosphere improves oil recovery, because
This buries mode, supercritical CO as what many countries and regions were paid close attention to2Influence to rock pore structure becomes research
With the hot spot of concern.Supercritical CO2Into after reservoir, forms carbon acidic fluid and pore structure is transformed, and then change
Reservoir properties.In terms of pore structure, with the enhancing of corrosion, corrosion is divided into face corrosion (Face
Disslution), worm hole corrosion (Wormhole formation) and uniform corrosion (Uniform dissolution).
Elkhoury etc. studies Peclet number, and (note: Peclet number is a dimensionless number, indicates the relative scale of convection current and diffusion.
With the increase of Peclet number, the ratio of diffusion transport is reduced in conveying capacity, and the ratio that convection current transports increases) and corrosion intensity
Corresponding relationship, it is indicated that low Peclet number forming face corrosion, middle Peclet number form large scale corrosion channel, high Peclet number
Form uniform corrosion；Then, Garcia-Rios etc. passes through Germicidal efficacy and confirms this understanding, and the researchs such as D á vila are also demonstrate,proved
The real increase with Peclet number, the intensity of corrosion has the trend to become larger in rock, but at the same time, D á vila etc.
It also indicates that, should be noted the influence of rock heterogeneity in research process, local heterogeneity may be to whole corrosion trend
Generate fundamental effect.
However, forefathers are to CO2When rock three dimensional pore structures are studied before and after Water-rock interaction, the CT scan essence of use
Degree is unable to satisfy Research Requirements.CO is carried out in laboratory2When Water-rock interaction, it is contemplated that high temperature and high pressure environment, therefore the sample selected
Product size is generally large, and based on the sample with diameter for 2.54cm, and CT equipment resolution ratio is directly related with scanning sample size,
Therefore show that the resolution ratio of CT scan is only tens microns in the data delivered at present, it is difficult to which high score is carried out to rock pore structure
The scanning of resolution.
Summary of the invention
In order to solve the problems such as sample size is big, scanning resolution is low present in the existing rock pore structure research,
The embodiment of the present invention provides a kind of for CO2The rock three dimensional pore structures measuring method of Water-rock interaction, which comprises
It is the first rock sample and the second rock sample by the rock cylindrical sample cutting of acquisition；
It determines porosity before the experiment of first rock sample, and obtains multiple micro- brill samples of second rock sample
Product determine each micro- volume ratio for boring sample；
According to preset sweep parameter and scan position, high resolution scanning, and benefit are carried out to multiple micro- brill samples
Porosity before determining the experiment of second rock sample with each micro- volume ratio for boring sample；
By each micro- brill sample relocation on the corresponding position of second rock sample, and by first rock
Stone sample and second rock sample are combined and wrap up；
According to preset experiment condition, to after package first rock sample and second rock sample carry out
CO2Water-rock interaction experiment；
Porosity after the experiment of first rock sample is determined, and according to the sweep parameter and scan position, to more
A micro- brill sample carries out high resolution scanning, and determines second rock using each micro- volume ratio for boring sample
Porosity after the experiment of sample；
According to porosity after porosity before the experiment of first rock sample and experiment, first rock sample is determined
Hole variation characteristic determine described the and according to porosity after porosity before the experiment of second rock sample and experiment
The hole variation characteristic of two rock samples；
According to the hole variation characteristic of second rock sample, the hole variation characteristic with first rock sample is
Constraint, determines the pore structure evolution Feature of the rock cylindrical sample.
Optionally, in an embodiment of the present invention, the length of first rock sample is 2 to 3 centimetres, second rock
The length of stone sample is 1 centimetre.
Optionally, in an embodiment of the present invention, micro- brill sample be cylindrical sample, a diameter of 1 to 3 millimeters,
Length is 1 to 3 millimeters.
Optionally, in an embodiment of the present invention, described according to preset sweep parameter and scan position, to multiple described
It includes: according to preset pixel point resolution and exposure rate, by CT scan to multiple that micro- brill sample, which carries out high resolution scanning,
Micro- brill sample carries out high resolution scanning, obtains scanning imagery before multiple micro- experiments for boring sample；According to the reality
Preceding scanning imagery is tested, determines porosity before each micro- experiment for boring sample.
Optionally, in an embodiment of the present invention, described to determine described the using each micro- volume ratio for boring sample
Porosity comprises determining that the corresponding preceding hole of experiment of each micro- volume ratio for boring sample before the experiment of two rock samples
The product of porosity, using the summation of multiple products as porosity before the experiment of second rock sample.
Optionally, in an embodiment of the present invention, the method also includes: by first rock sample and described second
Rock sample is combined according to the position before cutting, and is put between first rock sample and second rock sample
Set filter paper；First rock sample after combination is wrapped up with second rock sample by heat-shrink tube.
Optionally, in an embodiment of the present invention, described according to preset experiment condition, to first rock after package
Stone sample and second rock sample carry out CO2Water-rock interaction experiment includes: according to preset temperature, pressure and fluid item
Part, by after package first rock sample and second rock sample be put into CO2CO is carried out in Water-rock interaction device2Water rock
Reaction experiment.
Optionally, in an embodiment of the present invention, the method also includes: in CO2After Water-rock interaction experiment, by described the
One rock sample and second rock sample drying and fractionation.
Optionally, in an embodiment of the present invention, described according to the sweep parameter and scan position, to multiple described micro-
Boring sample and carrying out high resolution scanning includes: according to the CO2The pixel point resolution being arranged before Water-rock interaction experiment and exposure
Rate carries out high resolution scanning to multiple micro- brill samples by CT scan, after obtaining multiple micro- experiments for boring sample
Scanning imagery；According to scanning imagery after the experiment, porosity after each micro- experiment for boring sample is determined.
Optionally, in an embodiment of the present invention, described to determine described the using each micro- volume ratio for boring sample
Porosity comprises determining that the corresponding experiment metapore of each micro- volume ratio for boring sample after the experiment of two rock samples
The product of porosity, using the summation of multiple products as porosity after the experiment of second rock sample.
The present invention is protected using the small sample that original rock sample characterizes CT high-resolution, guarantees that fine scanning sample exists
CO2It is not destroyed in Water-rock interaction.Based on CT high-resolution nondestructive characterisation (NDC), realize to CO2Rock pore structure before and after Water-rock interaction
Quantitative assessment research in situ is carried out, visual pattern effectively increases the precision of three dimensional pore structures research.Effectively compensate for
There is experimental technique that can not carry out the short slab that reaction front and back high-resolution three-dimension pore structure compares in situ, can be CO2Water-rock interaction
Mechanism study and numerical simulation provide important model, are CO2Geological storage and raising rate of oil and gas recovery research provide basic mould
Type further pushes laboratory basic research work.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, embodiment will be described below
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is that one kind of the embodiment of the present invention is used for CO2The process of the rock three dimensional pore structures measuring method of Water-rock interaction
Figure；
Fig. 2 is the combination diagram of rock sample in the embodiment of the present invention；
Fig. 3 A and Fig. 3 B are the sectional view of rock sample in the embodiment of the present invention；
Fig. 4 is CO in the embodiment of the present invention2Water-rock interaction experimental provision schematic diagram；
Fig. 5 A- Fig. 5 D is CO in the embodiment of the present invention2The pore structure high resolution scanning pair of Water-rock interaction experiment front and back
Than figure.
Specific embodiment
The embodiment of the present invention provides a kind of for CO2The rock three dimensional pore structures measuring method of Water-rock interaction.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
CT scan method is generallyd use in the prior art, it is right by carrying out three dimensional pore structures measurement to experiment front and back sample
Than pore structure otherness, main determination step is as follows: (1) according to the size of clamper, preparing sample, it is desirable that high temperature resistant, resistance to
High pressure carries out lossless scanning to sample using CT equipment, measures pore structure and crack；(2) sample is placed in CO2Water-rock interaction
In clamper, setting and the consistent temperature of geological conditions and pressure condition carry out CO2Water-rock interaction experiment；(3) experiment terminates
Afterwards, sample is taken out, CT equipment is recycled to carry out lossless scanning to sample, measures pore structure and crack；(4) CO is compared2Water rock
Reaction front and back rock pore structure and crack variation characteristic, determine Evolution.But in view of the high temperature resistant, high pressure resistant of sample
Property, sample size can not accomplish very little, generally 2.54cm, therefore CT scan resolution ratio is lower, it is much in 30 μm, cause to be difficult
The pore structure of the rocks such as hyposmosis, densification is characterized, is conducted a research generally directed to the sample with crack or solution cavity
CO is used for as shown in Figure 1 for one kind of the embodiment of the present invention2The rock three dimensional pore structures measuring method of Water-rock interaction
Flow chart, method as shown in the figure includes: step S1, by the rock cylindrical sample cutting of acquisition be the first rock sample and second
Rock sample；
Step S2 determines porosity before the experiment of first rock sample, and obtains the more of second rock sample
A micro- brill sample determines each micro- volume ratio for boring sample；
Step S3 carries out high-resolution to multiple micro- brill samples and sweeps according to preset sweep parameter and scan position
It retouches, and determines porosity before the experiment of second rock sample using each micro- volume ratio for boring sample；
Step S4, by each micro- brill sample relocation on the corresponding position of second rock sample, and by institute
It states the first rock sample and second rock sample is combined and wraps up；
Step S5, according to preset experiment condition, to after package first rock sample and second rock-like
Product carry out CO2Water-rock interaction experiment；
Step S6 determines porosity after the experiment of first rock sample, and according to the sweep parameter and scanning position
It sets, high resolution scannings is carried out to multiple micro- brill samples, and described in each micro- volume ratio determination for boring sample of utilization
Porosity after the experiment of second rock sample；
Step S7 determines described first according to porosity after porosity before the experiment of first rock sample and experiment
The hole variation characteristic of rock sample, and according to porosity after porosity before the experiment of second rock sample and experiment, really
The hole variation characteristic of fixed second rock sample；
Step S8 is become according to the hole variation characteristic of second rock sample with the hole of first rock sample
Changing feature is constraint, determines the pore structure evolution Feature of the rock cylindrical sample.
In the present embodiment, the rock sample of acquisition is cylinder, and rock can be such as low-permeability tight rock, hole
For porosity less than 12%, air permeability is less than 1mD.In addition, the diameter of rock cylindrical sample is 2~3cm, length is greater than 3cm.It will
Collected rock cylindrical sample cutting is two parts, respectively the first rock sample and the second rock sample.
As an embodiment of the present invention, the length of the first rock sample is 2 to 3 centimetres, the length of the second rock sample
Degree is 1 centimetre.It is illustrated in figure 2 the combination diagram of rock sample in the embodiment of the present invention, the rock cylindrical sample in Fig. 2 is straight
Diameter is 2.54cm, and the first rock sample (sample part A) length is 2.54cm, and the second rock sample (sample part B) length is
1cm.Wherein, acquisition rock cylindrical sample can be drilled through using mechanical drill, and its both ends is cut flat with.Using cutting machine rock column
Shape sample cutting is two parts, and is polished using two end faces of the diamond dust of 1000 mesh to the second rock sample.Measurement first
Porosity before the experiment of rock sample, such as can use helium pore bridging, measure helium before the experiment of the first rock sample
Porosity.
After the completion of the second rock sample end face polishes, the second rock sample is placed under stereomicroscope, it is desirable that amplification
Multiple is not less than 200 times, according to end face structure feature, considers heterogeneity, selects representative locations as the specific of CT scan
Position, a general end face select 2~3 scan positions, and scan position is located at the middle section of the second rock sample as far as possible, main
Syllabus is that the second rock sample is destroyed during avoiding high temperature and pressure.Micro- drill sampling is carried out to the second rock sample, is drilled through
Multiple micro- brill samples record each micro- sample that bores in the position of the second rock sample end face and the volume ratio of calculating in the sample
Example, is recorded as C1, C2... ..., Cn。
As an embodiment of the present invention, micro- brill sample be cylindrical sample, a diameter of 1 to 3 millimeters, length 1
To 3 millimeters.If the dotted line in the second rock sample (sample part B) in Fig. 2 show micro- brill sample, such as Fig. 3 A and Fig. 3 B institute
It is shown as the sectional view of rock sample in the embodiment of the present invention, Fig. 3 A and Fig. 3 B show the sectional view of the second rock sample, from figure
Micro- brill sample (CT scan sample) in 3A and Fig. 3 B in visible second rock sample.
As an embodiment of the present invention, according to preset sweep parameter and scan position, to multiple micro- brill samples into
Row high resolution scanning include: according to preset pixel point resolution and exposure rate, by CT scan to multiple micro- brill samples into
Row high resolution scanning obtains scanning imagery before multiple micro- experiments for boring sample；According to scanning imagery before testing, each micro- brill is determined
Porosity before the experiment of sample.
In the present embodiment, 360 ° of high resolution scannings are carried out to micro- brill sample using CT, records the starting of Sample Scan
Position, it is proposed that pixel point resolution is not less than 1 μm, and the time for exposure is not less than 3s, and scanning number is not less than 3000, main purpose
It is to improve pore structure characterization precision, characterizes hole and crack in rock comprehensively as far as possible；Gold particle is placed in sample outer wall, mainly
Purpose is easy for the determination of experiment front and back characteristic point
Wherein, porosity comprises determining that before the experiment of the second rock sample is determined using each micro- volume ratio for boring sample
The product of porosity before the corresponding experiment of each micro- volume ratio for boring sample, using the summation of multiple products as the second rock
Porosity before the experiment of stone sample.After CT scan, using three dimensional analysis software, reconstructs pore model and calculates porosity,
It is recorded as ΦCP1, ΦCP2... ..., ΦCPn；Using volume ratio as weight, the porosity Φ of CT calculating before experiment with computingCTPE, i.e.,
Porosity before the experiment of two rock samples is shown in formula 1:
ΦCTPE=ΦCP1×C1+ΦCP2×C2+……+ΦCPn×Cn(1)
Micro- brill sample that second rock sample is drilled through is re-installed in the second rock sample, then by the first rock-like
Product are combined with the second rock sample according to Fig. 2, and are wrapped up the sample after combination.
As an embodiment of the present invention, by the first rock sample and the second rock sample according to the position before cutting into
Row combination, and filter paper is placed between the first rock sample and the second rock sample；By the first rock sample and after combination
Two rock samples are wrapped up by heat-shrink tube.Specifically, increasing the filter paper that 3 diameters are 2.54cm, filter among two samples
The effect of paper is to reduce the conflux effect of different sample contact faces.The sample after combination is wrapped up with heat-shrink tube, is placed in oven
In, after heat-shrink tube completely fastens sample, sample is taken out.Using heat-shrink tube the purpose is to reduce CO2Water-rock interaction is pressed from both sides
The directly etching of holder prevents from occurring to leak in experimentation leading to the failure of an experiment.
As an embodiment of the present invention, according to preset experiment condition, to the first rock sample and after package
Two rock samples carry out CO2Water-rock interaction experiment includes: according to preset temperature, pressure and fluid condition, by the after package
One rock sample and the second rock sample are put into CO2CO is carried out in Water-rock interaction device2Water-rock interaction experiment.It is illustrated in figure 4 this hair
CO in bright embodiment2Water-rock interaction experimental provision schematic diagram, the sample after combining shown in Fig. 4 are placed in CO2Water-rock interaction device
In, it is set to CO2Between fluid-filled system and fluid acquisition system.
As an embodiment of the present invention, in CO2After Water-rock interaction experiment, by the first rock sample and the second rock-like
Product drying and fractionation.Specifically, the first rock sample and the second rock sample are split, and will be in the second rock sample
Micro- brill sample is splitted out from the second rock sample.
In the present embodiment, after the test, porosity after the experiment of the first rock sample of measurement, such as using helium hole
Helium porosity after the experiment of porosity instrument the first rock of measurement.
As an embodiment of the present invention, according to sweep parameter and scan position, high score is carried out to multiple micro- brill samples
Resolution scanning includes: according to CO2The pixel point resolution and exposure rate being arranged before Water-rock interaction experiment, by CT scan to multiple
Micro- brill sample carries out high resolution scanning, obtains scanning imagery after multiple micro- experiments for boring sample；According to scanning imagery after experiment,
Determine it is each it is micro- bore sample experiment after porosity.
In the present embodiment, 360 ° of high-resolution noninvasive imagings are carried out to micro- brill sample after reaction using CT, according to anti-
For CT scan before answering as a result, determine specific scan position, when CT scan, needs to guarantee that experiment parameter is preceding identical as reaction.
In the present embodiment, porosity packet after the experiment of the second rock sample is determined using each micro- volume ratio for boring sample
It includes: determining the product of porosity after the corresponding experiment of each micro- volume ratio for boring sample, the summation of multiple products is made
For porosity after the experiment of the second rock sample.Hole using three dimensional analysis software, after reconstructing pore model and experiment with computing
Degree, is recorded as ΦCA1, ΦCA2... ..., ΦCAn；Using volume ratio as weight, CT three-dimensional apertures porosity Φ after experiment with computingCTAE, i.e.,
Porosity after the experiment of second rock sample, is shown in formula 2:
ΦCTAE=ΦCA1×C1+ΦCA2×C2+……+ΦCAn×Cn(2)
The hole variation characteristic of the first rock sample is determined by the porosity before and after comparing the experiment of the first rock sample,
It can be for such as experiment front and rear gaps porosity difference.Porosity before and after experiment by comparing the second rock sample, determines the second rock
The hole variation characteristic of stone sample, can be for such as experiment front and rear gaps porosity difference and CT scan contrast characteristic.Utilize the first rock
The hole variation characteristic of stone sample constrains data, according to the hole variation characteristic of the second rock sample, can determine rock
Stone cylindrical sample is in CO2The pore structure evolution Feature of Water-rock interaction experiment front and back.
As Fig. 5 A- Fig. 5 D show CO in the embodiment of the present invention2The pore structure high-resolution of Water-rock interaction experiment front and back
Scan comparison diagram.Wherein, Fig. 5 A and Fig. 5 C is CO2CT scan imaging before Water-rock interaction experiment, Fig. 5 B and Fig. 5 D are CO2Water rock
CT scan imaging after reaction experiment.From white block diagram corresponding position shown in figure before the reaction after pore morphology have occurred it is bright
Aobvious variation.The porosity that Fig. 5 C is calculated is that the porosity that 8.2%, Fig. 5 D is calculated is 5.5%, and reaction front and back porosity is reduced by about
20%.
Rock three dimensional pore structures measuring method through the invention characterizes CT high-resolution using original rock sample small
Sample is protected, and guarantees fine scanning sample in CO2It is not destroyed in Water-rock interaction.Based on CT high-resolution nondestructive characterisation (NDC),
It realizes to CO2Rock pore structure carries out quantitative assessment research in situ before and after Water-rock interaction, and visual pattern effectively increases three
Tie up the precision of pore configuration research.Reaction front and back high-resolution three-dimension hole knot can not be carried out by effectively compensating for existing experimental technique
The short slab that structure compares in situ can be CO2Water-rock interaction mechanism study and numerical simulation provide important model, are CO2Geological storage
Basic model is provided with rate of oil and gas recovery research is improved, further pushes laboratory basic research work.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention
Range is protected, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection scope of invention.
Claims (10)
1. one kind is used for CO2The rock three dimensional pore structures measuring method of Water-rock interaction, which is characterized in that the described method includes:
It is the first rock sample and the second rock sample by the rock cylindrical sample cutting of acquisition；
It determines porosity before the experiment of first rock sample, and obtains multiple micro- brill samples of second rock sample,
Determine each micro- volume ratio for boring sample；
According to preset sweep parameter and scan position, high resolution scanning is carried out to multiple micro- brill samples, and using respectively
Micro- volume ratio for boring sample determines porosity before the experiment of second rock sample；
By each micro- brill sample relocation on the corresponding position of second rock sample, and by first rock-like
Product and second rock sample are combined and wrap up；
According to preset experiment condition, to first rock sample and second rock sample progress CO after package2Water rock
Reaction experiment；
Porosity after the experiment of first rock sample is determined, and according to the sweep parameter and scan position, to multiple institutes
It states micro- brill sample and carries out high resolution scanning, and determine second rock sample using each micro- volume ratio for boring sample
Experiment after porosity；
According to porosity after porosity before the experiment of first rock sample and experiment, the hole of first rock sample is determined
Gap variation characteristic, and according to porosity after porosity before the experiment of second rock sample and experiment, determine second rock
The hole variation characteristic of stone sample；
According to the hole variation characteristic of second rock sample, the hole variation characteristic with first rock sample is about
Beam determines the pore structure evolution Feature of the rock cylindrical sample.
2. the method according to claim 1, wherein the length of first rock sample be 2 to 3 centimetres, institute
The length for stating the second rock sample is 1 centimetre.
3. a diameter of 1 arrives the method according to claim 1, wherein micro- brill sample is cylindrical sample
3 millimeters, length is 1 to 3 millimeters.
4. right the method according to claim 1, wherein described according to preset sweep parameter and scan position
Multiple micro- brill samples carry out high resolution scanning and include:
According to preset pixel point resolution and exposure rate, high-resolution is carried out to multiple micro- brill samples by CT scan and is swept
It retouches, obtains scanning imagery before multiple micro- experiments for boring sample；
According to scanning imagery before the experiment, porosity before each micro- experiment for boring sample is determined.
5. according to the method described in claim 4, it is characterized in that, described determined using each micro- volume ratio for boring sample
Porosity comprises determining that the corresponding reality of each micro- volume ratio for boring sample before the experiment of second rock sample
The product of porosity before testing, using the summation of multiple products as porosity before the experiment of second rock sample.
6. the method according to claim 1, wherein the method also includes:
First rock sample and second rock sample are combined according to the position before cutting, and described first
Filter paper is placed between rock sample and second rock sample；
First rock sample after combination is wrapped up with second rock sample by heat-shrink tube.
7. the method according to claim 1, wherein described according to preset experiment condition, to the institute after package
It states the first rock sample and second rock sample carries out CO2Water-rock interaction experiment include: according to preset temperature, pressure and
Fluid condition, by after package first rock sample and second rock sample be put into CO2It is carried out in Water-rock interaction device
CO2Water-rock interaction experiment.
8. the method according to claim 1, wherein the method also includes: in CO2It, will after Water-rock interaction experiment
First rock sample and second rock sample drying and fractionation.
9. the method according to claim 1, wherein described according to the sweep parameter and scan position, to more
A micro- brill sample carries out high resolution scanning and includes:
According to the CO2The pixel point resolution and exposure rate being arranged before Water-rock interaction experiment, by CT scan to multiple described micro-
It bores sample and carries out high resolution scanning, obtain scanning imagery after multiple micro- experiments for boring sample；
According to scanning imagery after the experiment, porosity after each micro- experiment for boring sample is determined.
10. according to the method described in claim 9, it is characterized in that, described true using each micro- volume ratio for boring sample
Porosity comprises determining that each micro- volume ratio for boring sample is corresponding after the experiment of fixed second rock sample
The product of porosity after experiment, using the summation of multiple products as porosity after the experiment of second rock sample.
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