CN112255256A - Shale oil movable proportion quantitative evaluation method - Google Patents
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- CN112255256A CN112255256A CN202011028076.7A CN202011028076A CN112255256A CN 112255256 A CN112255256 A CN 112255256A CN 202011028076 A CN202011028076 A CN 202011028076A CN 112255256 A CN112255256 A CN 112255256A
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- 239000003079 shale oil Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000011158 quantitative evaluation Methods 0.000 title claims abstract description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000005481 NMR spectroscopy Methods 0.000 claims abstract description 26
- 238000006073 displacement reaction Methods 0.000 claims abstract description 24
- 238000001228 spectrum Methods 0.000 claims abstract description 19
- 238000002474 experimental method Methods 0.000 claims abstract description 16
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 14
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 14
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 14
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 14
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 230000000717 retained effect Effects 0.000 claims abstract description 6
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 4
- 239000001257 hydrogen Substances 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 claims description 12
- 239000011435 rock Substances 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 3
- 239000005457 ice water Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 abstract description 2
- 238000005065 mining Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 23
- 239000007789 gas Substances 0.000 description 12
- 230000007547 defect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 239000004058 oil shale Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000011002 quantification Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000000685 Carr-Purcell-Meiboom-Gill pulse sequence Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011549 displacement method Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009532 heart rate measurement Methods 0.000 description 1
- 238000002075 inversion recovery Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000001225 nuclear magnetic resonance method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- G01N24/081—Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity
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Abstract
The invention provides a quantitative evaluation method of shale oil movable proportion, which is characterized by carrying out nuclear magnetic resonance T1-T2 two-dimensional spectrum test and carbon dioxide huff and puff displacement experiment on a core of a representative shale oil reservoir, determining the original retained hydrocarbon total signal intensity in shale as R1 according to the position characteristics of different hydrogen-containing components on a nuclear magnetic resonance T1-T2 two-dimensional spectrogram, then carrying out the carbon dioxide huff and puff displacement experiment on the core, then carrying out the nuclear magnetic resonance experiment again, recording the residual hydrocarbon total signal in the shale as R2, and obtaining the movable shale oil proportion F based on the signal intensity change of the nuclear magnetic resonance T1-T2 two-dimensional spectrums obtained before and after the carbon dioxide displacement experiment. The method obtains index parameters of the content of the retained hydrocarbons and the residual hydrocarbons after displacement in the shale reservoir based on a nuclear magnetic resonance two-dimensional spectrum method, performs shale movable oil displacement through a carbon dioxide huff-puff experiment under a simulated formation condition, is more close to the current commonly used shale oil underground mining process, and has the characteristics of accurate and convenient data calculation.
Description
Technical Field
The invention belongs to the technical field of oil-gas resource exploration, and particularly relates to a shale oil movable proportion quantitative evaluation method.
Background
In recent years, conventional oil and gas resource exploration is difficult to break through, but the long-term trend that global oil and gas resource demands will continuously rise is not changed, and unconventional oil and gas represented by shale oil and gas resources are becoming important supplements of conventional oil and gas resources and influencing global energy patterns.
The shale oil reservoir has a typical self-generation and self-storage characteristic, oil gas is not generated after being generated or only short-distance migration is generated in hydrocarbon source rocks, the corresponding thermal evolution degree of organic matters is 0.5-1.6%, the reservoir space is mainly a nanometer pore in the shale, the reservoir mode mainly comprises three modes of an adsorption state, a free state and a dissolution state, and in essence, the movable oil in the shale oil reservoir is a resource which can be really developed and utilized, so that the accurate evaluation of the movable oil proportion in the shale oil becomes a research hotspot.
From the oil and gas development angle, the recoverable part of the shale oil technology is movable oil, and carbon dioxide can reduce the viscosity of hydrocarbon fluid, improve the saturation pressure of the fluid and promote the volume expansion of crude oil, so that the carbon dioxide displacement method is widely applied to the development of compact oil and shale oil to improve the oil and gas recovery ratio. The nuclear magnetic resonance method is widely applied to fluid mobility research, particularly in recent years, the rapid development of a T1-T2 two-dimensional spectrum makes up for the defect of fluid signal overlapping of a one-dimensional spectrum technology in organic shale, avoids the defects of complex operation flow, long period, more dependence of test results on personal experience of operators and the like in fluid type distinguishing and mobility quantifying, and realizes the quantification of components while distinguishing organic types.
At present, certain defects or shortcomings exist in shale oil mobility quantitative evaluation method patents, for example, the shale movable oil quantitative determination experimental device of the invention patent 2013100721481 quantifies movable oil based on a stratum water flooding method, on one hand, the method is lagged behind compared with the carbon dioxide gas flooding exploitation which is commonly used at the present stage, on the other hand, the method can only determine the movable oil quantity, but cannot determine the proportion of the movable oil in the total oil; the invention discloses a geochemical evaluation method for the mobility of shale oil resources 2019102474113, which mainly divides the movable oil in a graphic manner by a geochemical means, so that the aim of accurate quantification is difficult to achieve; the invention patent 2017102181734 discloses a device and a method for evaluating the saturation amount of movable oil in shale, which are separated from the actual process of oil and gas exploitation and are difficult to simulate the actual geological exploitation conditions; the invention patent 2016111650093 discloses a method and a device for determining the movable fluid space of a core, which mainly focuses on the pore volume occupied by movable oil.
Disclosure of Invention
Aiming at the explanation of the background technology, the invention provides a quantitative evaluation method of shale oil mobility ratio, which is used for accurately quantifying the mobility problem of the current shale oil based on a nuclear magnetic resonance two-dimensional spectrum and an oil shale gas huff and puff displacement experiment.
In order to achieve the purpose, the invention provides the following technical scheme:
a shale oil movable proportion quantitative evaluation method comprises the following steps:
selecting a plurality of representative shale oil reservoir rock cores based on geological conditions;
secondly, processing the rock core according to the related requirements of the nuclear magnetic resonance two-dimensional spectrum test, performing the nuclear magnetic resonance T1-T2 two-dimensional spectrum test, and determining the total signal intensity of the retained hydrocarbons in the shale to be R1 according to the position characteristics of different hydrogen-containing components on the two-dimensional spectrum;
step three, carrying out a carbon dioxide huff and puff displacement experiment on the tested rock core under the formation temperature condition, wherein the single displacement time is 24 hours, opening a pressure relief valve of a displacement tank after the displacement is finished, discharging the fluid through a discharge pipeline, and collecting the displaced fluid in a bottle through an ice-water mixture cold trap;
opening the contact tank, taking out the rock core, performing the nuclear magnetic resonance experiment again, recording a total amount signal of the residual hydrocarbon in the shale as R2,
step five, the step three and the step four are circulated for multiple times, and the movable oil is considered to be completely displaced until the difference between the nuclear magnetic resonance spectrogram changes for the previous time and the nuclear magnetic resonance spectrogram changes for the next time is lower than 1%;
sixthly, based on the signal intensity change obtained by the nuclear magnetic resonance T1-T2 two-dimensional spectrums obtained before and after the carbon dioxide displacement experiment, the proportion F of the movable shale oil is obtained as follows:
the method obtains index parameters of the content of the retained hydrocarbons and the residual hydrocarbons after displacement in the shale reservoir based on a nuclear magnetic resonance two-dimensional spectrum method, performs shale movable oil displacement through a carbon dioxide huff-puff experiment under a simulated formation condition, is more close to the current commonly used shale oil underground mining process, and has the characteristics of accurate and convenient data calculation.
Drawings
In order to more clearly illustrate the embodiments of the patent of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the patent of the present invention, and other drawings can be obtained by those skilled in the art without inventive exercise.
FIG. 1 is a schematic diagram of an embodiment of the present invention;
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given in the present patent application without inventive step, shall fall within the scope of protection of the present patent application.
According to the figure 1, the shale oil movable proportion quantitative evaluation method shown as an embodiment comprises the following steps:
the method comprises the following steps:
selecting a certain shale oil reservoir core with 7 sections of oil shale with extended group length of Ordos basin as a representative example to perform actual operation based on geological conditions;
secondly, processing the rock core according to the related requirements of the nuclear magnetic resonance two-dimensional spectrum test, performing the nuclear magnetic resonance T1-T2 two-dimensional spectrum test, and determining the total signal intensity R1 of the retained hydrocarbon in the shale to be 5264 according to the position characteristics of different hydrogen-containing components on the two-dimensional spectrum;
the nuclear magnetic resonance test is to adopt a 15MHz SPEC-PMR nuclear magnetic resonance analyzer produced by Beijing SPEC company, is provided with a 25mm probe, and adopts an IR-CPMG pulse measurement sequence and a BRD inversion algorithm based on singular value decomposition. Meanwhile, the echo time of the instrument can reach 60us, the detection of extremely short relaxation components such as kerogen and shale oil can be met, the contrast is high, and in addition, the scanning times are set to be 64 times in order to improve the signal to noise ratio. The relationship between the inversion recovery time τ 1 and the echo time τ 2 and the measurement data can be expressed by equation (2):
wherein E (tau 1, tau 2) is Gaussian white noise; f (T1, T2) is the ordinary function; (1-2e- τ 1/T1) e- τ 2/T2 is the integrating kernel; in this study, τ 1 was chosen logarithmically as 12 discrete values.
Step three, carrying out a carbon dioxide huff and puff displacement experiment on the tested rock core under the formation temperature condition, wherein the single displacement time is 24 hours, opening a pressure relief valve of a displacement tank after the displacement is finished, discharging the fluid through a discharge pipeline, and collecting the displaced fluid in a bottle through an ice-water mixture cold trap;
opening the contact tank, taking out the rock core, performing the nuclear magnetic resonance experiment again, and recording the total amount signal of the residual hydrocarbon in the shale as R2 of 3716;
step five, continuously circulating the step three, and after huff-puff displacement is carried out for four times, obtaining R2 signals of nuclear magnetic resonance spectrograms of the front and back two times which are 3609 and 3593 respectively, wherein the difference of the front and back changes is 0.4 percent and is lower than 1 percent, and at the moment, the movable oil is considered to be completely displaced;
sixthly, based on the signal intensity change obtained by the nuclear magnetic resonance T1-T2 two-dimensional spectrums obtained before and after the carbon dioxide displacement experiment, the proportion F of the movable shale oil is obtained as follows:
the above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall be covered by the protection scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the protection scope of the claims.
Claims (1)
1. A shale oil movable proportion quantitative evaluation method is characterized by comprising the following steps: the method comprises the following steps:
selecting a plurality of representative shale oil reservoir rock cores based on geological conditions;
secondly, processing the rock core according to the related requirements of the nuclear magnetic resonance two-dimensional spectrum test, performing the nuclear magnetic resonance T1-T2 two-dimensional spectrum test, and determining the original retained hydrocarbon total signal intensity in the shale to be R1 according to the position characteristics of different hydrogen-containing components on the two-dimensional spectrum;
step three, carrying out a carbon dioxide huff and puff displacement experiment on the tested rock core under the formation temperature condition, wherein the single displacement time is 24 hours, opening a pressure relief valve of a displacement tank after the displacement is finished, discharging the fluid through a discharge pipeline, and collecting the displaced fluid in a bottle through an ice-water mixture cold trap;
opening the contact tank, taking out the rock core, performing the nuclear magnetic resonance experiment again, and recording a total amount signal of the residual hydrocarbon in the shale as R2;
step five, the step three and the step four are circulated for multiple times, and the movable oil is considered to be completely displaced until the difference between the nuclear magnetic resonance spectrogram changes for the previous time and the nuclear magnetic resonance spectrogram changes for the next time is lower than 1%;
sixthly, based on the signal intensity change obtained by the nuclear magnetic resonance T1-T2 two-dimensional spectrums obtained before and after the carbon dioxide displacement experiment, the proportion F of the movable shale oil is obtained as follows:
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113738353A (en) * | 2021-09-28 | 2021-12-03 | 中国石油大学(北京) | Method, system, equipment and storage medium for predicting movable oil quantity of oil-containing shale |
| CN118583907A (en) * | 2024-06-04 | 2024-09-03 | 中国矿业大学(北京) | Helium-rich natural gas reservoir efficiency evaluation method, device, system and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113738353A (en) * | 2021-09-28 | 2021-12-03 | 中国石油大学(北京) | Method, system, equipment and storage medium for predicting movable oil quantity of oil-containing shale |
| CN118583907A (en) * | 2024-06-04 | 2024-09-03 | 中国矿业大学(北京) | Helium-rich natural gas reservoir efficiency evaluation method, device, system and storage medium |
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Application publication date: 20210122 |