CN111337990A - Metal mineral logging device and method based on pulse neutron source - Google Patents
Metal mineral logging device and method based on pulse neutron source Download PDFInfo
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- CN111337990A CN111337990A CN202010179181.4A CN202010179181A CN111337990A CN 111337990 A CN111337990 A CN 111337990A CN 202010179181 A CN202010179181 A CN 202010179181A CN 111337990 A CN111337990 A CN 111337990A
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 30
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 29
- 239000002184 metal Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000011707 mineral Substances 0.000 title claims abstract description 29
- 238000005259 measurement Methods 0.000 claims abstract description 20
- 230000009471 action Effects 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 4
- 239000010935 stainless steel Substances 0.000 claims abstract description 4
- 239000002366 mineral element Substances 0.000 claims description 30
- 238000001228 spectrum Methods 0.000 claims description 27
- 238000012545 processing Methods 0.000 claims description 7
- 229910052580 B4C Inorganic materials 0.000 claims description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 3
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 3
- 238000009499 grossing Methods 0.000 claims description 3
- 239000011133 lead Substances 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 239000011733 molybdenum Substances 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 238000010183 spectrum analysis Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims 2
- 230000006641 stabilisation Effects 0.000 claims 1
- 238000011105 stabilization Methods 0.000 claims 1
- 239000010931 gold Substances 0.000 abstract description 19
- 229910052737 gold Inorganic materials 0.000 abstract description 7
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
- 238000002083 X-ray spectrum Methods 0.000 abstract description 3
- 239000003345 natural gas Substances 0.000 abstract description 2
- 238000003947 neutron activation analysis Methods 0.000 abstract description 2
- 229910052770 Uranium Inorganic materials 0.000 abstract 3
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000005251 gamma ray Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009614 chemical analysis method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011158 quantitative evaluation Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
- G01V5/04—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
- G01V5/08—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays
- G01V5/10—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources
- G01V5/104—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting secondary Y-rays as well as reflected or back-scattered neutrons
- G01V5/105—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting secondary Y-rays as well as reflected or back-scattered neutrons the neutron source being of the pulsed type
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
- G01V5/04—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
- G01V5/08—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays
- G01V5/12—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using gamma or X-ray sources
- G01V5/125—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using gamma or X-ray sources and detecting the secondary gamma- or X-rays in different places along the bore hole
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- Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention discloses a metal mineral logging device and method based on a pulse neutron source, and relates to the field of oil and natural gas exploration. The metal mineral logging device based on the pulse neutron source comprises a shell, wherein the shell is cylindrical and is made of stainless steel materials, the thickness of the shell is 5-11 mm, an interface, a pulse neutron source, a neutron source shielding body, a detector shielding body, an X-ray detector, a gamma detector and an electronic control unit are arranged in the shell from bottom to top, and low-energy secondary gamma rays generated by the action of neutrons and a stratum element nucleus are fully utilized to excite characteristic X rays of elements such as gold (Au), uranium (U) and the like in a stratum; and analyzing the characteristic X-rays of Au and U by collecting the excited characteristic X-ray spectrum, and performing qualitative identification and quantitative measurement on the Au and U ores of the stratum in the drill hole. Compared with the traditional logging method of metal ores based on neutron activation analysis (PGNAA), the method has lower detection lower limit of metal ores such as Au, U and the like.
Description
Technical Field
The invention relates to the field of petroleum and natural gas exploration, in particular to a metal mineral logging device and method based on a pulse neutron source.
Background
Along with the continuous deepening of mineral resource exploration and development, the difficulty of finding ores is continuously increased, and how to effectively improve the depth, precision and resolution capability of exploration has great significance for promoting the development of resource exploration industry, realizing the breakthrough of finding ores, relieving the resource supply and demand contradiction of economic and social development and ensuring the resource and energy safety. Drilling is an important means of geological general investigation work, and at present, drilling results are mainly obtained by a core sampling chemical analysis method, so that the method is large in task amount, poor in economical efficiency and long in time consumption. Based on a neutron activation (PGNAA) pulse neutron logging technology (CN 201710615018.6), gamma rays generated by the action of neutrons and metal elements are collected, so that the in-situ quantitative evaluation of the type and content of near-wellbore mineral elements can be realized, the grade of an ore bed can be calculated under the drilling logging condition, the thickness of the ore bed is determined, and a measurement result is provided in real time.
The metal mineral well logging technology based on neutron activation analysis can measure iron, copper, tungsten, gold and other mineral deposits by measuring capture gamma rays generated by the action of neutrons and formation elements. Compared with the results of a core sampling chemical analysis method, the underground pulsed neutron logging can basically realize semi-quantitative evaluation of the mineral grade. However, the method has the problem that the detection lower limit is high and the metal element with lower content cannot be identified.
Disclosure of Invention
Aiming at the defects, the invention provides metal mineral logging equipment and a method for reducing the detection lower limit of metal minerals by additionally arranging an X-ray detector to collect a characteristic X-ray spectrum excited by secondary low-energy gamma rays generated by the action of neutrons and a stratum and analyzing the X-ray spectrum.
The invention specifically adopts the following technical scheme:
a metal mineral logging device based on a pulse neutron source comprises a shell, wherein an interface, a pulse neutron source, a neutron source shielding body, a detector shielding body, an X-ray detector, a gamma detector and an electronic control unit are arranged in the shell from bottom to top, and the detector shielding body is used for shielding the X-ray detector, the gamma detector and the pulse neutron source part, so that rays generated after neutrons pass through a stratum effect enter the gamma detector or the X-ray detector; the X-ray detector is provided with a window corresponding to the shell, so that characteristic X-rays can be detected conveniently, the window is filled with high-strength low-density substances, and the electronic control unit comprises an energy spectrum acquisition part, a multi-channel analysis part and a power supply control part.
Preferably, the shell is cylindrical and made of stainless steel material, and the thickness of the shell is 5 mm-11 mm.
Preferably, the X-ray detector is a semiconductor detector, the recorded ray energy is 0.01-0.145 MeV, the gamma detector is a crystal detector, the recorded ray energy is 1-10 MeV, and the distance between the gamma detector and the pulse neutron source is 45-65 cm.
Preferably, the neutron source shield is made of steel.
Preferably, the detector shield is a composite material consisting of boron carbide, lead, molybdenum, polyethylene.
Preferably, the pulsed neutron source is a D-T neutron source.
A metal mineral logging method based on a pulse neutron source adopts the equipment, and the measuring process is as follows:
releasing secondary gamma rays by utilizing the action of neutrons and the stratum, exciting characteristic X rays by utilizing the action of the secondary gamma rays and mineral elements, measuring the equipment close to a well wall, and obtaining the type and content information of the underground mineral elements according to characteristic X ray energy spectrums at different depths recorded by the equipment;
the secondary gamma rays are secondary gamma rays released by inelastic scattering and neutron capture reactions of high-energy neutrons and the stratum;
the mineral elements are useful elements contained in natural minerals or rock resources;
the measurement close to the well wall means that the pushing arm is adopted to enable the distance between the equipment and the well wall to be less than 5mm, and the measurement is carried out by lifting an instrument through an aboveground power device and is point measurement or uniform measurement;
the type and content information of the underground mineral elements are obtained by an energy spectrum processing and energy spectrum analyzing method, the type of the mineral elements is determined by an X-ray detector through the position of a characteristic X-ray peak in a recorded energy spectrum, the content of the mineral elements is determined by the strength of the characteristic peak, and the energy spectrum processing refers to peak searching, spectrum stabilizing and spectrum smoothing of original measurement; the energy spectrum analysis method is to use the least square method to obtain the relation between the content of the target mineral element in the measured stratum and the characteristic X-ray count.
The invention has the following beneficial effects:
according to the invention, an X-ray detector is added on the basis of the traditional pulse neutron logging technology, and the X characteristic rays generated by the action of low-energy secondary gamma rays and formation elements are measured, so that the type and the content of the formation mineral elements are determined, the lower limit of metal element detection is reduced, and the mineral element measurement precision is improved.
Drawings
FIG. 1 is a schematic diagram of one embodiment of a pulsed neutron source based metal mineral logging tool;
FIG. 2 is a graph showing the expected corresponding intensity of gamma ray energy generated by the interaction of neutrons and metallic Au;
FIG. 3 is a flow chart of the method for evaluating the content of Au in the metal mineral product according to the scheme;
FIG. 4 is a graph showing the relationship between the number of secondary gamma-ray excitation characteristic X-rays and the content of Au under the conditions of the example;
FIG. 5 is a diagram illustrating the relationship between Au capture gamma counts and Au content measured by a conventional pulsed neutron logging technique under the conditions of the example.
Wherein, 1 is a pulse neutron source, 2 is a neutron source shielding body, 3 is a window, 4 is an X-ray detector, 5 is a gamma detector, 6 is a photomultiplier, and 7 is a shell.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
with reference to fig. 1, a metal mineral logging device based on a pulse neutron source comprises a shell 7, wherein the shell is cylindrical and made of stainless steel materials, the thickness of the shell is 5-11 mm, an interface, a pulse neutron source 1, a neutron source shielding body 2, a detector shielding body, an X-ray detector 4, a gamma detector 5 and an electronic control unit are arranged in the shell from bottom to top, a photomultiplier tube 6 is arranged at the rear part of the gamma detector 5, the interface is used for being connected with other underground equipment, the pulse neutron source can be a D-T neutron source, and the detector shielding body is used for shielding the X-ray detector, the gamma detector and the pulse neutron source part so that rays generated after neutrons pass through the action of a stratum enter the gamma detector or the X-ray detector; the X-ray detector is provided with a window corresponding to the shell, so that characteristic X-rays can be detected conveniently, the window is filled with high-strength low-density substances, metal beryllium is preferred, and the electronic control unit comprises an energy spectrum acquisition part, a multi-channel analysis part and a power supply control part.
High-energy neutrons emitted by the pulse neutron source bombard the stratum to release secondary gamma rays, and the secondary gamma rays can excite characteristic X rays under the action of mineral elements; through the energy spectrum processing and energy spectrum analyzing technology, the type of mineral elements can be determined by the position of a characteristic peak in an energy spectrum recorded by an X-ray detector, the content of the mineral elements can be determined by the intensity of the characteristic peak, and therefore the direct relation between the characteristic fluorescence ray count and the content of the stratum target mineral elements is established.
The X-ray detector is a semiconductor detector, the recorded ray energy is 0.01-0.145 MeV, the gamma detector is a crystal detector, the recorded ray energy is 1-10 MeV, and the distance between the gamma detector and the pulse neutron source is 45-65 cm.
The neutron source shield may be made of steel; the detector shield is a composite material consisting of boron carbide, lead, molybdenum and polyethylene.
A metal mineral logging method based on a pulse neutron source adopts the equipment, and the measuring process is as follows:
releasing secondary gamma rays by utilizing the action of neutrons and the stratum, exciting characteristic X rays by utilizing the action of the secondary gamma rays and mineral elements, measuring the equipment close to a well wall, and obtaining the type and content information of the underground mineral elements according to characteristic X ray energy spectrums at different depths recorded by the equipment;
the secondary gamma rays are secondary gamma rays released by inelastic scattering and neutron capture reactions of high-energy neutrons and the stratum; the characteristic X-rays are generated by secondary gamma ray excitation.
The mineral elements are useful elements contained in natural minerals or rock resources;
the measurement close to the well wall means that the pushing arm is adopted to enable the distance between the equipment and the well wall to be less than 5mm, and the measurement is carried out by lifting an instrument through an aboveground power device and is point measurement or uniform measurement;
the type and content information of the underground mineral elements are obtained by an energy spectrum processing and energy spectrum analyzing method, the type of the mineral elements is determined by an X-ray detector through the position of a characteristic X-ray peak in a recorded energy spectrum, the content of the mineral elements is determined by the strength of the characteristic peak, and the energy spectrum processing refers to peak searching, spectrum stabilizing and spectrum smoothing of original measurement; the energy spectrum analysis method is to use the least square method to obtain the relation between the content of the target mineral element in the measured stratum and the characteristic X-ray count.
By adopting the technical scheme provided by the invention, the measurement is carried out in gold ore strata of different grades. Knowing that the content of Au element in the gold ore formation is 0.036%, 0.073%, 0.109%, 0.145% and 0.725%, respectively, the device X-ray detector collects the characteristic fluorescent ray count of Au element, and fig. 4 is a relationship between the content of gold element and the characteristic X-ray count of tungsten element in the obtained formation (the specific flow is shown in fig. 2). It can be seen that the linear correlation of the characteristic X-ray count of the mineral elements of the secondary gamma excitation with the mineral element content is better. FIG. 5 shows the relationship between Au characteristic capture gamma counts and Au element content measured by the conventional pulsed neutron metal mineral logging technique, and the linear relationship between the Au characteristic capture gamma counts and the Au element content is poor (the energy of the adopted characteristic capture gamma ray is 1.693MeV, as shown in FIG. 3); it can be seen that when the content of the metal element is low, the traditional pulse neutron logging method is difficult to evaluate the content and the grade of the metal mineral.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (7)
1. A metal mineral logging device based on a pulse neutron source comprises a shell and is characterized in that an interface, a pulse neutron source, a neutron source shielding body, a detector shielding body, an X-ray detector, a gamma detector and an electronic control unit are arranged in the shell from bottom to top, wherein the detector shielding body is used for shielding the X-ray detector, the gamma detector and the pulse neutron source part, so that rays generated after neutrons pass through a stratum to act enter the gamma detector or the X-ray detector; the X-ray detector is provided with a window corresponding to the shell, so that characteristic X-rays can be detected conveniently, the window is filled with high-strength low-density substances, and the electronic control unit comprises an energy spectrum acquisition part, a multi-channel analysis part and a power supply control part.
2. The metal mineral logging device of claim 1, wherein the housing is cylindrical and is made of stainless steel material and has a thickness of 5mm to 11 mm.
3. The metal mineral logging device of claim 1, wherein the X-ray detector is a semiconductor detector and records a radiation energy of 0.01 to 0.145MeV, the gamma detector is a crystal detector and records a radiation energy of 1 to 10MeV, and the distance between the gamma detector and the pulsed neutron source is 45 to 65 cm.
4. A pulsed neutron source-based metal mineral logging tool as claimed in claim 1 wherein the neutron source shield is made of steel.
5. The metal mineral logging device of claim 1, wherein the detector shield is a composite material of boron carbide, lead, molybdenum, polyethylene.
6. A metal mineral logging tool based on a pulsed neutron source as claimed in claim 1 wherein the pulsed neutron source is a D-T neutron source.
7. A method of metal mineral logging based on a pulsed neutron source, using an apparatus according to any of claims 1 to 6, characterized in that the measurement process is:
generating secondary gamma rays by utilizing the action of neutrons and a stratum, exciting characteristic X rays by utilizing the action of the secondary gamma rays and mineral elements, measuring the equipment close to a well wall, and obtaining the type and content information of the underground mineral elements according to characteristic X ray energy spectrums at different depths recorded by the equipment;
the secondary gamma rays are secondary gamma rays released by inelastic scattering and neutron capture reactions of high-energy neutrons and the stratum;
the mineral elements are useful elements contained in natural minerals or rock resources;
the measurement close to the well wall means that the pushing arm is adopted to enable the distance between the equipment and the well wall to be less than 5mm, and the measurement is carried out by lifting an instrument through an aboveground power device and is point measurement or uniform measurement;
the method comprises the following steps that the information of the types and the content of underground mineral elements is obtained through an energy spectrum processing and energy spectrum analyzing method, an X-ray detector determines the types of the mineral elements through the peak positions of characteristic X-rays in recorded energy spectrums, the intensity of the characteristic peaks determines the content of the mineral elements, and the energy spectrum processing means that original measurement is subjected to peak searching, spectrum stabilization and spectrum smoothing; the energy spectrum analysis method is to use the least square method to obtain the relation between the content of the target mineral element in the measured stratum and the characteristic X-ray count.
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| CN202010179181.4A CN111337990A (en) | 2020-03-13 | 2020-03-13 | Metal mineral logging device and method based on pulse neutron source |
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| CN202010179181.4A CN111337990A (en) | 2020-03-13 | 2020-03-13 | Metal mineral logging device and method based on pulse neutron source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114264681A (en) * | 2021-12-29 | 2022-04-01 | 清华大学 | Method and system for analyzing gold ore grade |
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| CN101078775A (en) * | 2007-06-29 | 2007-11-28 | 西安奥华电子仪器有限责任公司 | Impulse neutron bispectrum saturation logging method |
| CN104655664A (en) * | 2015-01-27 | 2015-05-27 | 南京航空航天大学 | Method and device for in-situ detection of multiple elements and contents in water body |
| CA2940007A1 (en) * | 2016-08-24 | 2016-10-24 | Imperial Oil Resources Limited | Processing oil sand streams |
| CN106338531A (en) * | 2016-10-11 | 2017-01-18 | 吉林大学 | Detection structure for analyzing elementary components in flow liquid slurry based on PGNAA technique |
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2020
- 2020-03-13 CN CN202010179181.4A patent/CN111337990A/en active Pending
Patent Citations (4)
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|---|---|---|---|---|
| CN101078775A (en) * | 2007-06-29 | 2007-11-28 | 西安奥华电子仪器有限责任公司 | Impulse neutron bispectrum saturation logging method |
| CN104655664A (en) * | 2015-01-27 | 2015-05-27 | 南京航空航天大学 | Method and device for in-situ detection of multiple elements and contents in water body |
| CA2940007A1 (en) * | 2016-08-24 | 2016-10-24 | Imperial Oil Resources Limited | Processing oil sand streams |
| CN106338531A (en) * | 2016-10-11 | 2017-01-18 | 吉林大学 | Detection structure for analyzing elementary components in flow liquid slurry based on PGNAA technique |
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| Title |
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| JUNTAO LIU 等: "A method for improving the evaluation of elemental concentrations measured by geochemical well logging", 《JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114264681A (en) * | 2021-12-29 | 2022-04-01 | 清华大学 | Method and system for analyzing gold ore grade |
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