CN105629319A - Device for determining stratum element logging standard spectrum and relative sensitivity and method thereof - Google Patents
Device for determining stratum element logging standard spectrum and relative sensitivity and method thereof Download PDFInfo
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- CN105629319A CN105629319A CN201510996010.XA CN201510996010A CN105629319A CN 105629319 A CN105629319 A CN 105629319A CN 201510996010 A CN201510996010 A CN 201510996010A CN 105629319 A CN105629319 A CN 105629319A
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- well logging
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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 nuclear radiation, e.g. of natural or induced radioactivity
- G01V5/04—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
- G01V5/08—Prospecting or detecting by the use of nuclear 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 nuclear radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/36—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry
- G01T1/362—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry with scintillation detectors
Abstract
The invention provides a device for determining stratum element logging standard spectrum and relative sensitivity and a method thereof. Required parameters can be directly measured by an experimental method. The method comprises the following steps that step 1, a measurement box internally filled with fluid is established, and a neutron gamma spectrum a of an element to be measured under the state is measured by adopting an element logging instrument; step 2, an annular cylinder containing the element to be measured is arranged in the measurement box, and a neutron gamma spectrum b of the element to be measured under the state is measured by adopting the element logging instrument; step 3, the neutron gamma spectrum a is deducted by the neutron gamma spectrum b so that a standard spectrum of the element to be measured is obtained; and step 4, summation is performed on the standard spectrum of the element to be measured within the range of an energy segment required by spectrum unfolding, counting corresponding to the energy segment is calculated to act as the net spectrum counting value of the element to be measured, and thus sensitivity of the element substance to be measured is obtained. The device comprises the measurement box, the annular cylinder containing the element to be measured and the element logging instrument which is connected with a ground system.
Description
Technical field
The present invention relates to oil well logging field, it is specially the device and method of determining stratum geochemical well logging standard spectrum and relative sensitivity.
Background technology
Stratum element well logging method is one of effective well logging method of bad ground hydrocarbon reservoir evaluation. Development in recent years is very fast. Accurately obtain the content of element, it is the important foundation determining this well logging method effect. It is based on measuring the linear superposition that the neutron gamma spectrums obtained is the single gamma spectrums of each element in stratum that the basic skills of constituent content is asked in geochemical well logging. Obtained the relative yield of each element by spectrum unscrambling, then by the mode of closed model, relative yield is converted to constituent content. This kind of method it is crucial that effectively obtain the standard spectrum of element and determine the relative sensitivity of often kind of element.
Stratum element is logged well, and is the elemental characteristic gamma ray spectroscopy excited after measuring neutron irradiation stratum, draws the content of stratum element after spectrum unscrambling. The neutron source that excites used has two types, and one is isotropic substance neutron source; Another kind is controlled neutron source. The gamma ray that the former produces is based on thermal capture gamma. The latter is owing to exciting neutron energy higher, and in the gamma spectrums of generation, existing thermal capture gamma (elastic scattering gamma), also has inelastical scattering gamma.
The method of conventional determination elemental standards spectrum is single element or the compound of setting up certain element, adjusting hole porosity and density so that overall that the deceleration length of neutron is all relatively close. But this kind of mode analog calculation easily carries out, actual tests is implemented more difficult, and some is difficult to realize. In conventional geochemical well logging constituent content method of calculation, spectrum unscrambling calculates element used and captures gamma standard spectrum and relative sensitivity, is be based upon on the numerical simulation calculation basis of assumed physical model substantially, and its exactness can directly do not verified effectively.
Summary of the invention
For problems of the prior art, the present invention provides a kind of device and the method for determining stratum geochemical well logging standard spectrum and relative sensitivity, it is possible to method directly records required parameter by experiment.
The present invention is achieved through the following technical solutions:
Determine the method for stratum geochemical well logging standard spectrum and relative sensitivity, comprise the steps:
Step 1, sets up the inner testing case being filled with fluid, adopts geochemical well logging apparatus measures to obtain element to be measured neutron gamma spectrums a in this condition;
Step 2, places the annular canister containing element to be measured in testing case, adopts geochemical well logging apparatus measures to obtain element to be measured neutron gamma spectrums b in this condition;
Step 3, deducts neutron gamma spectrums a with neutron gamma spectrums b, obtains the standard spectrum of element to be measured;
Step 4, sues for peace the standard spectrum of element to be measured within the scope of the energy section needed for spectrum unscrambling, calculate to should be able to the counting of section, be the clean spectrum counting value Nj of element to be measured; The sensitivity S j of elemental substance to be measured is obtained according to the following formula of formula;
Sj=Nj/ (�� j*Wi);
Wherein, ��jFor the density of element to be measured in annular canister, Wi is that element to be measured accounts for weight percentage in annular canister, Wi=1 during simple substance.
Preferably, in testing case, fluid level is greater than 150cm, and testing case Edge Distance width between centers is greater than 75cm.
Preferably, in testing case, fluid is water or oil.
Preferably, the cross section of annular canister is circular or Polygons.
Preferably, in annular canister, span geochemical well logging instrument axle center distance is 20-35cm.
For the method for the invention is determined the device of stratum geochemical well logging standard spectrum and relative sensitivity, comprise testing case, the annular canister containing element to be measured, and connect the geochemical well logging instrument of ground plane system; Being filled with fluid in described testing case, fluid level is greater than 150cm, and testing case Edge Distance width between centers is greater than 75cm, and when measuring neutron gamma spectrums b, in annular canister, span geochemical well logging instrument axle center distance is 20-35cm.
Preferably, in testing case, fluid is water or oil.
Preferably, the cross section of annular canister is circular or Polygons.
Preferably, comprise flicker gamma detector for measuring the geochemical well logging instrument of neutron gamma spectrums, and isotropic substance neutron source or controlled neutron source; When adopting controlled neutron source, neutron gamma spectrums refers in particular to neutron death gamma spectrums.
Preferably, annular canister outer setting have for water or oil isolation sealing coat.
Compared with prior art, the present invention has following useful technique effect:
The present invention disclose a kind of can at the container cartridge of full fluid, namely testing case is measured obtain the well logging standard spectrum of element and relative sensitivity method and device. In this way, obtain the sensitivity of element, and then can realize the method determining relative sensitivity. Apparatus structure is simple, and method is easy to operate, studies for theoretical modeling, and experiment is implemented to be all easily realize. Owing to relative sensitivity is relevant to the energy section of the measurement spectrum chosen during actual computation, therefore, the method that can be realized by this kind, people can study some special energy section feature interested. The difference that the standard spectrum of Theoretical Calculation may produce can also be corrected simultaneously.
Accompanying drawing explanation
Schematic diagram is put in the cross section that Fig. 1 is device of the present invention.
Fig. 2 measures the standard spectrum schematic diagram obtaining element described in present example.
In figure: 1 is testing case, 2 is geochemical well logging instrument, and 3 is annulus cylinder.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, and the explanation of the invention is not limited.
The present invention determines the method for stratum element relative sensitivity, adopts the device determining stratum geochemical well logging standard spectrum, specific as follows.
Setting up the testing case 1 of meeting spatial size, in testing case 1, fluid is water or oil. Fluid level is greater than 150cm, and testing case 1 Edge Distance width between centers is greater than 75cm.
Testing case 1 is placed the annular canister of element to be measured or the cylinder of other shape, it is preferable that employing annulus cylinder 3, annular canister inside radius is between 20-35cm, and barrel is thick in 0.5-2cm scope.
First, in testing case 1 during ringless-type cylinder, obtain the spectrum of the measurement in fluid by geochemical well logging instrument 2;
Then, geochemical well logging instrument 2 is having measurement in the testing case 1 of certain elemental substance annular canister, obtains measuring in this kind of element fluid spectrum.
3rd, the measurement spectrum in the measurement spectrum deduction fluid obtained when annular canister exists, obtains the standard spectrum of this elemental substance.
4th, obtained the logging sensitivity of this element by standard spectrum, by this sensitivity compared with the sensitivity of Si element, obtain the well logging relative sensitivity of this element.
Concrete, as shown in Figure 1,
In independent water tank, measure the measurement neutron gamma spectrums a obtaining instrument in water
The water tank having annulus cylinder 3 is measured again, obtains the hybrid measurement neutron gamma spectrums b of certain element in water. Annulus cylinder 3 is the simple substance containing certain element or compound annulus cylinder.
Measure spectrum a with measurement spectrum b deduction, obtain elements are contained instrument 2 relative to annulus cylinder 3 neutron gamma spectrums.
Gamma spectrums is sued for peace within the scope of the energy section needed for spectrum unscrambling, calculate to should be able to the counting of section, be the clean spectrum counting value Nj of element to be measured. Divided by the material density of annulus cylinder 3, draw the counting value of this material of unit density.
Sj=Nj/ (��j*Wi)(1)
In formula: the sensitivity of certain element of Sj; The clean spectrum counting value of certain elements are contained of Nj; ��jThe density value of this kind of element. The weight percentage of Wi element in material.
Relative sensitivity is determined by following formula.
Srj=Sj/SSi (2)
In formula: Srj is the relative sensitivity of required J kind element, and Sj is the sensitivity of jth kind element, and SSi is the sensitivity of Si element.
Adopt method of the present invention, it is preferable that, water is measured material Ti elemental standards as shown in Figure 2 general, the element spectral that when dotted line is have cylinder ring in water in figure, geochemical well logging instrument 2 is measured, this spectrum of solid line deduction instrument obtains element spectral after measuring spectrum in water. This spectrum is implemented Gui Yihou, so that it may draw the Ti elemental standards spectrum of corresponding logging instrumentation.
Preferably, adopt plastics or other containers to be arranged on annular canister outward as sealing coat, water or oil in elemental substance to be measured and testing case are kept apart, avoid the raw reaction of element to be measured and water or fry dried food ingredients, thus complete follow-up measurement.
Claims (10)
1. determine the method for stratum geochemical well logging standard spectrum and relative sensitivity, it is characterised in that, comprise the steps:
Step 1, sets up the inner testing case being filled with fluid, adopts geochemical well logging apparatus measures to obtain element to be measured neutron gamma spectrums a in this condition;
Step 2, places the annular canister containing element to be measured in testing case, adopts geochemical well logging apparatus measures to obtain element to be measured neutron gamma spectrums b in this condition;
Step 3, deducts neutron gamma spectrums a with neutron gamma spectrums b, obtains the standard spectrum of element to be measured;
Step 4, sues for peace the standard spectrum of element to be measured within the scope of the energy section needed for spectrum unscrambling, calculate to should be able to the counting of section, be the clean spectrum counting value Nj of element to be measured; The sensitivity S j of elemental substance to be measured is obtained according to the following formula of formula;
Sj=Nj/ (�� j*Wi);
Wherein, ��jFor the density of element to be measured in annular canister, Wi is that element to be measured accounts for weight percentage in annular canister, Wi=1 during simple substance.
2. the method determining stratum geochemical well logging standard spectrum and relative sensitivity according to claim 1, it is characterised in that, in testing case, fluid level is greater than 150cm, and testing case Edge Distance width between centers is greater than 75cm.
3. the method determining stratum geochemical well logging standard spectrum and relative sensitivity according to claim 1, it is characterised in that, in testing case, fluid is water or oil.
4. the method determining stratum geochemical well logging standard spectrum and relative sensitivity according to claim 1, it is characterised in that, the cross section of annular canister is circular or Polygons.
5. the method determining stratum geochemical well logging standard spectrum and relative sensitivity according to claim 1, it is characterised in that, in annular canister, span geochemical well logging instrument axle center distance is 20-35cm.
6. for method described in claim 1 is determined the device of stratum geochemical well logging standard spectrum and relative sensitivity, it is characterised in that, comprise testing case, the annular canister containing element to be measured, and connect the geochemical well logging instrument of ground plane system; Being filled with fluid in described testing case, fluid level is greater than 150cm, and testing case Edge Distance width between centers is greater than 75cm, and when measuring neutron gamma spectrums b, in annular canister, span geochemical well logging instrument axle center distance is 20-35cm.
7. the device determining stratum geochemical well logging standard spectrum and relative sensitivity according to claim 6, it is characterised in that, in testing case, fluid is water or oil.
8. the device determining stratum geochemical well logging standard spectrum and relative sensitivity according to claim 6, it is characterised in that, the cross section of annular canister is circular or Polygons.
9. the device determining stratum geochemical well logging standard spectrum and relative sensitivity according to claim 6, it is characterised in that, comprise flicker gamma detector for measuring the geochemical well logging instrument of neutron gamma spectrums, and isotropic substance neutron source or controlled neutron source; When adopting controlled neutron source, neutron gamma spectrums refers in particular to neutron death gamma spectrums.
10. the device determining stratum geochemical well logging standard spectrum and relative sensitivity according to claim 6, it is characterised in that, annular canister outer setting have for water or oil isolation sealing coat.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107288629A (en) * | 2017-07-25 | 2017-10-24 | 中国石油大学(华东) | A kind of neutron gamma density logging method based on new n γ two-particle locators |
| CN107765321A (en) * | 2017-09-29 | 2018-03-06 | 环太平洋高科技开发有限公司 | A kind of geochemical well logging data processing method for indicating stratum element content |
| CN112114382A (en) * | 2020-08-19 | 2020-12-22 | 中国石油天然气集团有限公司 | Correction method for neutron capture gamma standard spectrum of formation element logging |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107288629A (en) * | 2017-07-25 | 2017-10-24 | 中国石油大学(华东) | A kind of neutron gamma density logging method based on new n γ two-particle locators |
| CN107288629B (en) * | 2017-07-25 | 2020-07-14 | 中国石油大学(华东) | Neutron-gamma density logging method based on novel n-gamma double-particle detector |
| CN107765321A (en) * | 2017-09-29 | 2018-03-06 | 环太平洋高科技开发有限公司 | A kind of geochemical well logging data processing method for indicating stratum element content |
| CN112114382A (en) * | 2020-08-19 | 2020-12-22 | 中国石油天然气集团有限公司 | Correction method for neutron capture gamma standard spectrum of formation element logging |
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