CN108776094A - A kind of nuclear magnetic resonance rock core relaxation time imaging method - Google Patents
A kind of nuclear magnetic resonance rock core relaxation time imaging method Download PDFInfo
- Publication number
- CN108776094A CN108776094A CN201810563124.9A CN201810563124A CN108776094A CN 108776094 A CN108776094 A CN 108776094A CN 201810563124 A CN201810563124 A CN 201810563124A CN 108776094 A CN108776094 A CN 108776094A
- Authority
- CN
- China
- Prior art keywords
- magnetic resonance
- nuclear magnetic
- core
- relaxation time
- relaxation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011435 rock Substances 0.000 title claims abstract description 14
- 238000003384 imaging method Methods 0.000 title claims abstract description 12
- 238000005481 NMR spectroscopy Methods 0.000 title claims abstract description 11
- 239000012530 fluid Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000009792 diffusion process Methods 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims description 4
- 238000009826 distribution Methods 0.000 abstract description 5
- 239000011148 porous material Substances 0.000 abstract description 2
- 235000019476 oil-water mixture Nutrition 0.000 abstract 1
- 238000002595 magnetic resonance imaging Methods 0.000 description 9
- 238000004458 analytical method Methods 0.000 description 5
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000000685 Carr-Purcell-Meiboom-Gill pulse sequence Methods 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002366 mineral element Substances 0.000 description 1
- 230000005311 nuclear magnetism Effects 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009774 resonance method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- 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
-
- 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
- G01N24/081—Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity
-
- 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
- G01N24/082—Measurement of solid, liquid or gas content
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- High Energy & Nuclear Physics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Dispersion Chemistry (AREA)
- Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
Abstract
A kind of nuclear magnetic resonance rock core relaxation time imaging method.Tested core sample is relatively low in magnetostatic field, in the case of ignoring diffusion relaxation and body relaxation, T1 and T2 includes identical information, consider from time of measuring, the selection T2 relaxation times calculate the pore size of rock core, can be imaged out by the spatial distribution for the oil water mixture fluid contained in core sample.This method method is simple, and image taking speed is fast.
Description
Technical field
The present invention relates to a kind of magnetic resonance imaging method employings, especially the relaxation to the core sample during oil exploration
The magnetic nuclear resonance method that time is imaged.
Background technology
Nuclear magnetic resonance core fluids analytic approach is a kind of technical method of important detection formation oil air water storage content.
Nuclear magnetic resonance core fluids analytic approach can not be by by means of hydrogen atom to the response pattern of magnetostatic field and radio-frequency pulse magnetic field
The presence of oil is influenced and accurately detected existing for mineral element.Different, the nuclear magnetic resonance core fluids point according to the position of detection
Analysis method is divided into underground core fluids analysis and ground experiment room analysis method.According to detection when whether online real-time detection, core
Magnetic resonance core analysis method can be divided into wireline logging and well logging again, the former refers to having been broken into well, after drilling well funeral affairs
Fluid near palisades is detected and analyzed, and the latter is as its name suggests that rock core around is carried out at the same time during drilling well
Analysis.
Magnetic resonance imaging, also known as magnetic resonance imaging are a kind of widely used imaging methods for hydrogen atom distribution.
Medically, widely used mr imaging technique carries out the imaging practice of human tissue organ, and image resolution ratio is high, but
It is equipment manufacturing cost costliness.The method that the present invention uses for reference medical magnetic resonance imaging carries out hydrogen atoms point to containing fluid core sample
Cloth is imaged.
In Chinese invention patent《The one-dimensional 1H magnetic resonance imagings of core capillary pressure and saturation curves, gas reservoir
Measurement & characterization method》（Application number 201710898529.3）In, it discloses core capillary pressure and joins with saturation curves, oil-gas reservoir
Several one-dimensional 1H Magnetic resonance imagings measurement & characterization methods, including step：Core sample is prepared, saturation core sample is prepared and surveys
Calculate porosity, the low field 1H MRI of liquid distribution are measured in core sample, centrifugation core sample low field 1H MRI are measured, calculate from
Heart core sample corresponds to the capillary pressure of each point of the positions MRI and draws capillary pressure with saturation curves to explain that oil-gas reservoir is joined
Number.This method measuring speed is fast, data are accurate and reliable, and still, what is provided is the one-dimensional distribution of capillary fluid pressure, is not had
The distributed in three dimensions of Hydrogen Proton density in fluid.
Invention content
For currently without the present situation being imaged to fluid in core porous media, the present invention provides a kind of nuclear magnetic resonance
Relaxation time imaging method, for carrying out three-dimensional imaging to containing fluid distrbution in core.
The present invention realizes its technology, and the scheme taken is：Molecule diffusion motion makes molecule in nuclear-magnetism measurement process
It repeatedly collides with rock surface, in each collision, there are two types of relaxation processes：First, proton energy is transmitted to rock particles table
Face is to generate longitudinal relaxation time T1;It is dissipated second is that expendable phase occurs for spin phase, when to produce transverse relaxation
Between T2.Rock Relaxation Mechanism is the interaction by fluid molecule and rock particles surface.
The invention has the advantages that the mode of imaging sees that liquid hides distribution of the matter in rock core pore structure, and
Further the content calculation of grease substance can be come out by Relaxation Mechanism.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the principle assumption diagram that the present invention realizes the imaging of core fluid nuclear magnetic resonance Relaxation Mechanism.
Indicate that rock core measurement process, outside apply magnetostatic field in Fig. 1, position A, B, C indicate the diffusion of different moments atom
Position.
Specific implementation mode
Assuming that when 90 degree of pulses of CPMG arrive, molecule is at A, and the spin magnetization vector in molecule is reversed later
To x/y plane, when 180 degree pulse arrives, molecule is diffused at the B of position and with the frequency of f (B) into hole, is generating spin echo
Te times, the molecule are diffused at c, and with the frequency precession of f (C), and due to Magnetic field inhomogeneity, the magnetic field between A to the B of position is high
Magnetic field between B to C, thus the precession frequency between A to B is caused higher than the precession frequency between B to C to molecular spin
Additional phase dispersion.It is very short in the echo time through research, in the case of magnetostatic field is relatively low, ignore diffusion relaxation.When T1 is measured
Between it is very long, generally select T2。
Claims (2)
1. a kind of nuclear magnetic resonance rock core relaxation time imaging method, in nuclear magnetic resonance core imager, blowhole is by not
Duct with size forms, and the hole of each size has the feature relaxation time of oneself, exists in the core relaxation time is imaged
Multi-exponential decay process.
2. a kind of nuclear magnetic resonance rock core relaxation time imaging method according to claim 1, it is characterized in that：Magnetostatic field compared with
In the case of low, the echo time is very short, can ignore diffusion relaxation, when the viscosity of fluid in rock is very big, fluid self-diffusion
Movement is weaker, and the body relaxation time can also ignore.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810563124.9A CN108776094A (en) | 2018-06-04 | 2018-06-04 | A kind of nuclear magnetic resonance rock core relaxation time imaging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810563124.9A CN108776094A (en) | 2018-06-04 | 2018-06-04 | A kind of nuclear magnetic resonance rock core relaxation time imaging method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108776094A true CN108776094A (en) | 2018-11-09 |
Family
ID=64025693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810563124.9A Pending CN108776094A (en) | 2018-06-04 | 2018-06-04 | A kind of nuclear magnetic resonance rock core relaxation time imaging method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108776094A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115078438A (en) * | 2022-06-19 | 2022-09-20 | 西南石油大学 | Method for establishing pore network model based on nuclear magnetic resonance test digital core |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697915A (en) * | 2015-03-20 | 2015-06-10 | 中国石油化工股份有限公司江汉油田分公司勘探开发研究院 | Shale micropore size and fluid distribution analysis method |
| CN205297569U (en) * | 2015-12-15 | 2016-06-08 | 中国石油天然气股份有限公司 | A device for confirming tight sand saturation exponent |
| US20160370492A1 (en) * | 2015-02-26 | 2016-12-22 | Halliburton Energy Services, Inc. | Methods and systems employing nmr-based prediction of pore throat size distributions |
| CN106351652A (en) * | 2016-11-25 | 2017-01-25 | 中国地质大学（北京） | Shape correcting method for nuclear magnetic resonance logging T2 spectrum containing hydrocarbon reservoir layers |
-
2018
- 2018-06-04 CN CN201810563124.9A patent/CN108776094A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160370492A1 (en) * | 2015-02-26 | 2016-12-22 | Halliburton Energy Services, Inc. | Methods and systems employing nmr-based prediction of pore throat size distributions |
| CN104697915A (en) * | 2015-03-20 | 2015-06-10 | 中国石油化工股份有限公司江汉油田分公司勘探开发研究院 | Shale micropore size and fluid distribution analysis method |
| CN205297569U (en) * | 2015-12-15 | 2016-06-08 | 中国石油天然气股份有限公司 | A device for confirming tight sand saturation exponent |
| CN106351652A (en) * | 2016-11-25 | 2017-01-25 | 中国地质大学（北京） | Shape correcting method for nuclear magnetic resonance logging T2 spectrum containing hydrocarbon reservoir layers |
Non-Patent Citations (2)
| Title |
|---|
| 王为民: "核磁共振岩石物理研究及其在石油工业中的应用", 《中国优秀博硕士学位论文全文数据库（博士） 基础科学辑》 * |
| 龚国波 等: "岩心孔隙介质中流体的核磁共振弛豫", 《波普科学杂志》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115078438A (en) * | 2022-06-19 | 2022-09-20 | 西南石油大学 | Method for establishing pore network model based on nuclear magnetic resonance test digital core |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10801941B2 (en) | Isotope nuclear magnetic method for analyzing ineffective water absorption of rock pores | |
| US6856132B2 (en) | Method and apparatus for subterranean formation flow imaging | |
| US4719423A (en) | NMR imaging of materials for transport properties | |
| Stapf et al. | NMR imaging in chemical engineering | |
| Song | Magnetic resonance of porous media (MRPM): A perspective | |
| US9551769B2 (en) | Magnetic resonance examination of porous samples | |
| JP3204707B2 (en) | NMR measurement method and apparatus | |
| US11340180B2 (en) | Method for nuclear magnetic resonance diffusion measurements | |
| CN107561112B (en) | A kind of magnetic nuclear resonance method obtaining rock permeability section | |
| Oswald et al. | Observation of flow and transport processes in artificial porous media via magnetic resonance imaging in three dimensions | |
| Frosch et al. | Probing the pore space of geothermal reservoir sandstones by nuclear magnetic resonance | |
| US9541513B2 (en) | Method for nuclear magnetic resonance diffusion measurements | |
| Newgord et al. | Simultaneous assessment of wettability and water saturation using 2D NMR measurements | |
| Ronczka et al. | Optimization of CPMG sequences to measure NMR transverse relaxation time T 2 in borehole applications | |
| NO344398B1 (en) | Method and device for incorporation of internal gradient and limited diffusion in NMR inversion by well logging | |
| CN108982567A (en) | A kind of nuclear magnetic resonance rock core spin echo imaging method | |
| WO2003040743A1 (en) | Method and apparatus for subterranean formation flow imaging | |
| AU2002351916A1 (en) | Method and apparatus for subterranean formation flow imaging | |
| Garcia et al. | Integrated workflow to estimate permeability through quantification of rock fabric using joint interpretation of nuclear magnetic resonance and electric measurements | |
| BR102013000752A2 (en) | METHOD OF INVESTIGATING AN OBJECT USING NUCLEAR MAGNETIC RESONANCE EQUIPMENT (NMR), AND METHOD OF INVESTIGATING A ROCK LOADING NUCLEAR MAGNETIC RESONANCE EQUIPMENT (NMR) | |
| Amin et al. | Spatial and temporal mapping of water in soil by magnetic resonance imaging | |
| CN108776094A (en) | A kind of nuclear magnetic resonance rock core relaxation time imaging method | |
| CN109507221A (en) | A kind of multi-dimensional nmr molecule propagation property imaging method | |
| CN108896463A (en) | A kind of nuclear magnetic resonance core permeability imaging method | |
| Chen et al. | Quantitative magnetic resonance imaging methods for core analysis |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20181109 |
|
| WD01 | Invention patent application deemed withdrawn after publication |