MX2011000008A - Absolute elemental concentrations from nuclear spectroscopy. - Google Patents

Abstract

Systems and methods for estimating absolute elemental concentrations of a subterranean formation from neutron-induced gamma-ray spectroscopy are provided. In one example, a system for estimating an absolute yield of an element in a subterranean formation may include a downhole tool and data processing circuitry. The downhole tool may include a neutron source to emit neutrons into the formation, a neutron monitor to detect a count rate of the emitted neutrons, and a gamma-ray detector to obtain gamma-ray spectra deriving at least in part from inelastic gamma- rays produced by inelastic scattering events and neutron capture gamma-rays produced by neutron capture events. The data processing circuitry may be configured to determine a relative elemental yield from the gamma-ray spectra and to determine an absolute elemental yield based at least in part on a normalization of the relative elemental yield to the count rate of the emitted neutrons.

Description

ABSOLUTE ELEMENTARY ENTRATIONS OF SPEC EAR DEDENTS The present invention relates to spectroscopy of gamma rays induced by neut, in particular, with techniques for absolute elementary entrances of S-gamma spectra induced by neutrons.

Using core tools of elementary entrainment of an underground formation to rminar using a variety of techniques. A straight line of the formation lithology can be information of electrical density measurements (PEWF) of gamma ray diffusion. A direct detection of neutron elements ("neutron capture gamma rays") characteristic energies that, based on spectroscopic e pueden,,, pueden pueden pueden pueden pueden identificar identificar. Las Las Las Las Las Las Las Las Las Las Las Las Las Las Las Las Las Las té té té té té té the buibles to inelastic gamma rays of various characters.Most notably, the ratio of the gamma detected due to carbon versus two to oxygen. {"C / 0 ratio") has been used for training oil ration. is that some instrumental effects, variable neutron ta and a number of beats, will be canceled.A disadvantage of which is usually more difficult to interpret neutron gamma ray energy typically included in a spectrum of c rones may include Yes, Ca, Fe, S, Ti, Gd, s, and sometimes Al, Na, Mg, Mn, Ni and other res or trace. These techniques usually also require only relative concentrations of training, unless a concuption of a training element is already well known.

Certain other techniques for absolute elemental entrainments in a spectroscopy formation of oxide oxide standardization, or they can involve their spectroscopy recording with active measurements of natural gamma rays, can also disadvantages. In particular, these may involve remote tools and long measurement times.

ENDIO Certain aspects of conformity with the modalities originally claimed should be understood that these aspects are presented to provide the reader with a brief summary so that the modalities can take and that these are intended to limit the scope of the mod reality, the modalities can cover a variety that may not be exposed.

The present modalities generalize with. systems and methods for the neutrons emitted, and a gamma ray detector deriving gamma-ray spectra derived from inelastic gamma rays produced by inelastic evolution and gamma rays from capture of ucidos by neutron capture events. The data rocessing can be configured for relative elementary performance of the a-spectra and to determine an elementary performance absolut at least in part in a normalization of the relative relative to the odds count regime.

E DESCRIPTION OF THE DRAWINGS The advantages of the present disclosure are evident after reading the following one and by referring to the drawings in the wellbores of Figure 1, in accordance with this; Figure 3 is a flow chart that mode of a method to determine absolute renals in a formation based on neutron-induced gamma metrics, in accordance with modality; Figure 4 is a flow chart showing the modality of a method for determining partial absolute renin in a formation and using based on inductive gamma ray measurements, in accordance with one modality; Figure 5 is a flow graph that mode of a method to determine absolute concentrics based on yields In these modalities, not all of the actual implementations are described in the specification. You should appreciate that in the actual development of a realization, as in any engineering or design, numerous specific implementation decisions must be made to achieve the specific goals, such as compliance with restraints with the system and related to nego in varying from one implementation to another. In addition, it should be noted that said development effort could be time consuming, but nevertheless it would be one or more design, manufacturing, and manufacturing for ordinary experience that have the benefit.

The modalities of the subject matter ac rones, which can cause the emission of ray and neutron capture. The neutron capture and neutron capture rays can have characteristics that are characteristic of the elements of the neutrons.

The amount of neutrons emitted, or otherwise known, and the resulting spectra can be measured and normalized to the supervised rums. It has been determined that absolute elementary entries can be derived from elementary ray spectroscopy, which can be referred to standardized gamma-ray rendimi cs by the supervised or known and various cor ss to be considered for training and / or propi ema 10 to determine the concentrations of an underground formation that incombines 12 downhole and a data system. By way of example, the well tooling can be a smooth line or wire tool for registering an existing well, boom in a drill set for after it is drilled (L D). The process system 14 can be incorporated in tool 12 of or can be in a remote location. The well tool can be surrounded by a housing The downhole tool 12 can source 18, neutrons configured to emit to an underground formation. By way of neutron axis 18 it can be a source of oactiva, the absolute output of the source 18 can be determined through calibration. Adding absolute output from source 18 of neutrons to rine by computing the change of activity of rons as a function of time from a point that a radioactive source can follow a known exponential force or can have a v cide.

If the neutron source 18 includes an electronic neutron, an instantaneous output of the neutron 18 may depend on many p neutron generation controls, and the neutron alternating neutron source 18 may include the beam current supplied within the long neutron generating tube due to the aging of the tube in additionally impacting neutron neutron output.

Consequently, in some modalities of neutrons 20, it can monitor the neutron source 18 sources. The monitors can be, for example, a multiplier pi scintillator which can detect primarily ispersons directly from the source 18 of neut e 'to provide a signal from the orifice regime to the neutron exit rate of the neutrons. As discussed in more detail at the day of neutrons, whether determined by trituration of neutron source 18 and / or by peds, or through the use of n ozo monitor 20 it may further include one or more a detectors, and may include Three or more downhole detectors 12 may include gamma ray detectors, and may include gamma ray detectors. The fonction tool 12 in FIG. 1 includes two 26 S gamma detectors. The relative positions of the detec 28 of gamma rays in tool 12 of background in vary.

The gamma-ray detectors 26 and / or 28 contained in respective detent housings 30 in detectors 26 and S gamma can allow gamma-ray beams or spectra to produce light when the rays either or are captured in the crystals. can be configured to obtain an a and / or gamma ray spectra, and in this way a g beam pulse height analyzer One or more neutron detectors 21 located elsewhere in the tool 12 of, and can be used to determine various environmental facctions, as described above, the one or more neutron detectors, epithermal, or neutron detectors. It will allow the measurement of a dependence on the thermal and / or epithermal rones in the vicinity of the 26 and / or 28 gamma rays. This flow of ico and / or epithermal can be measured or calculated by neutron detectors 21 located away from e neutrons.

Designed to run a variety of software, i ware that implements all or part of the entities. Alternatively, the process system 14 may include, among other things, a main computer, a computer system, a computer specific application or set to implement all or part of the technique based on special software provided as part of the system. . In addition, the data processing may include either a processor or a plurality of processors for processing the functionality currently described.

In general, the processing system 14 includes circuit 44 for data processing, a microcontroller or microprocessor, such a personal computer) or one or more mass devices (eg, a hard drive, or a device). storage of 0M stat, DVD, or other storage device). Ircuito 44 data processing can be processed as inputs for various software branches, including data 40.

This data associated with the present tea is stored in, or provided by, the mass storage mass of the data system. Alternatively, these provide the processing circuit 44 with processing system 14 through input devices. In one embodiment, the acquisition of data may represent any appropriate communications network, such as the local area or the Internet. Through this device, the data processing system 14 exchanging data and communicating with other networked data, whether close to or remote from the network, may include several components that facilitate communication, including switches, guides, servers, network adapters, cations, and so on.

The downhole tool 12 can t data 40 to the acquisition circuit 42 for data processing through a downlink of symmetry communication or a communication cable. After re S 40, the circuit 42 for acquisition of absolute data and / or neutron capture 44 of data processing then output to, a report 46 indicating the one or more pr uradas of the training. The report 46 can be provided to the operator or provided to an operator through output devices, such as a printer and / or a printer.

Figure 2 illustrates a neutron-induced gamma-ray re-operation 48, which invokes the surrounding ground-bottom tool 50. In the operation of Figure 2, the bottom tool * 12 lowered to a bore 52. The borehole operation may begin when the source releases neutrons 54 towards the form 50 formation at 60 events of ca rones, which can produce gamma rays 62 of c rones. If the neutron source 18 emits rums 54 of insufficient energy for inelastic scattering rests, substantial neutron capture 60 can occur.

Inelastic gamma rays 58 and / or neutral neutron rays can be detected by d / o 28 of gamma rays. Since the spectra of the rays 58 and 62 gamma pteristics were annotated to the elements from which they were derived, the spectra of the rays 58 and / or 62 gam ized to determine the elementary yields.

At the same time, the neutron monitor 18 the neutron source 18 can measure the s capable of detecting gamma inelastic gamma neutron capture rays 58 which presents the region of the formation near the respective gamma deteco4 rays. A fraction of the total rums 54 can escape from said clone regions may depend on several factors as fewer neutrons reach the region of the fors than the 26 and / or 28 g ray detectors, less detectable 58 and / or 62 gamma rays. ucir. Making the length slow is a factor that contributes to this effect.

Similarly, due to the fact that the gamma-ray detectors and detectors 26 and / or 28, the count, neutron count, or more neutron detectors 21 may need to consider to use several parameters, downstream.

Another complication that can be presented is the measurement of gamma rays of gamma. In particular, the amount of neutrons reaching the volume of the detectable formation 26 and / or 28 of gamma rays may not be directed to the absolute neutron output of the high-energy 8v. gr., 14.1 MeV). Rather, the thermal rum may depend on the transport of time of life of the thermal neutrons through 50 before the capture. As such, tools of other tools and / or modeling will calculate the thermal neutron fraction that olume of the formation 50 detectable by those to use to consider these effects. Finalm of the perforation 52 can also compliances obtained from the gamma rays 58 and / or 62 ctores 26 and / or 28 gamma rays. The effects on the perforation 52 can be considered additional parts of side formation parameters, which may include perforation diameter measurement or sigma calculation of the perforation 52.

If the downhole tool 12 in neutron detector next to the detector 26 and gamma, this neutron detector 21 can be the flow of thermal and / or epithermal neutrons the region of the formation 50 and / or perfor Detector 26 and / or 28 gamma rays can reveal certain characteristics under Figure 3, a graph 64 of flow start 66, when the tool 12 downhole to the formation 50 and the source 18 neutron meets 12 of well bottom emits neutrons 54 surrounding 50. In step 68, which may or time with step 66, the neutron output to source 18 of neutrons can be measured using e neutrons near source 18 of neutrons. Alternatively, the absolute neutron output of neutrons 18 can be calculated later based on the source 18 calibration of radioactive decay models. In the 26 and / or 28 gamma-ray pastors, the gamma rays 58 and / or 62 are inelastic and d neutrons that can occur when the gamma-ray neutrons attributable to an intrarest region can be normalized to the output of the neutron. The neutron source 18 can produce an uncorrected absolute value of the formation 50. Several factors can be considered for environmental currents of the formation 50 and / or the perfo can influence the gamma-ray spectra two. In step 76, based on the ratios an or more absolute elementary concentrations ation 50 can be determined, as described in relation to Equation 81). These steps can be ordered, and you can start by calculating, by the following relationship: Yi * TotCR * F (parameter-l, parameter-2, ...) (/ nCR In Equation (1) above, Ai represents absolute rones for the monitors 20 of neutrone's calculation by calibration or radioactive modulation. F represents a cell factor for counting the perforation parameters 50. As mentioned above, these coordinates can count for gamma-ray transport, among other things, and environmental parameters are discussed below.

In Figure 4, a graph 78 of flow mode of a method for determining partial returns of elementary concentrations 50 and perforation 52. Graph 78 proceeds with step 80, when the tool 12 is lowered to formation 50 and the source of neutron source 18 or radioactive mod- ule. In step 84, the gamma-ray detectors can measure the spectra of rael or 62 inelastic and neutron capture qu produced when neutrons 54 interacts with ation 50.

Steps 85-92 may generally be processing which may occur in a tool in the downhole tool 12 and data processing tool 14. In the passage of processed gamma rays, elementary distributions, or yields, can be made. In step 86, these yields, the gamma-ray yields attributable to a neutral region can be normalized to the output of partial absolute values attributable to the perforation 52 can be determined, as is or with reference to Equation 82).

In particular, for the coefficient elements 50 and the perforation 52, the yield of Ai can be considered as a sum over the partial receipts in the formation 50 AFi and the perforation. Under these conditions, it can be possible of two possibilities, which can be there is a significant dctral between the portions of the and / or 62 gamma rays of the sentence formation 52, and that there may be no dizable difference. If a difference between the conventional sentence formation 52 exists, we can say the absolute yield ±, in a component s 85-92 can be achieved in any order, zar calculating, for example, the following relation (Yf, i "ff (parameter-l, parameter-2, ...) + YBH, 8 * FB (parameter-1, parameter-2, ...)) * TotCR / nCR In Equation 82) above, Ai represents absolute values for each element i, and A represents the partial absolute yields of the formation 50 and perforation 52, respectively represent the elementary yields relativity 50 and perforation 52, or the fraction of the gamma guides. measured attributed to the element i atr 50 formation and perforation 52, respectively, represents the total count regime within the spectrum used in the spectral analysis for ext for Arabas of the above-described modalities described by Figures 3 and 4 and the Ecuac) , the environmental correction factor F can be rather complicated ion. The F factors of the cell can be factored, and the dependence of the parameters can be determined by Monte Cario calculations. Ftalk factors F can also include a determined factor by calibrating the downhole-end hardware. Addition- ally, the scale factor could be analyzed by self-consistency of the closure results described above by the E and (2). An example of the scale factor is pr o. density densities, measurements or calculations of neutrons capture thermal neutron formation or perforation, and so on. A different meter can be derived from a set of non-reported common physical parameters of record, which may not have explicit interest. For example, these other parameters, among other things, flow computations close to the neutron energy distribution beam detectors 26 and / or 28 to the gamma ray detectors 26 and / or 28, account for monitor 20 of raw neutrons, detector region 26 and / or 28 of crude gamma rays. These other parameters can be measured using the one or more detectors 21 of a and a neutron flux 54 measured, as are my neutron detectors 21 and / or as in other measurements of the formation 50. One F factors applied to the performance of plastic rays may contain a dependence on the. epitérmicos rones in the proximity of the detector 2 ayos gamma. The thermal neutron flux or ep is measured or calculated by one or more mon neutrons, away from the neutron certron 18 neutron monitor, or formations of the 50 formation can be calculated.

One or more of the factors F can contndencia in the attenuation of gamma rays in the detector 26 and / or 28 of gamma rays. One or more Fs may contain a variance correction in the vicinity of the detector 26 and / or 28 a, as determined by other well measurements or by using various other modeling techniques.

An example of a fact formulation is described below as Equation (3). The example arrangement described in Equation 8 depends on the cross-section of total formation curves, length of hac rones (Ls), volume density (pb), neutron capture section of drill drilling fluid (DB) ), and the following relationship can be represented: + gi) * exp (Ls / g2) * exp (pb / g3) * exp (DB / g4) on gi and g2 depend on DB, g3 depends on Ls, and g mourning an element or a partial performance entó, which is it can determine in accordance with flow icas 64 or 78 of Figures 3 or 4. In specific characteristics to the element that can be considered and applied to the element's refinement. These characteristics are designed with a sensitivity factor depending on, which can consider, for example, sversoles, gamma ray multiplicities, resor 26 and / or 28 of gamma rays, and / or atomic weight 100, various physical properties of the element, and / or tool can be considered as an actor of appropriate scale. In step 102, based on previous ideas, a partial density of the formation 50 can be obtained. where Si is the sensitivity dependent on ele by, among other things, transverse sections of gamma ray, gamma ray and / or atomic weight response, and f is a f la.

By way of example, the constant scale factor f determined from a first calculation of p can be derived from the physical constants of the icular (v. Gr., Mass) and / or other environmental information (v. Gr., Density). of volume). Addition- ally, the scale factor f can be a fraction, a calibration against m certain predetermined conditions or a modality, the factor f can be a con- stituency of the formation 50. lution. Additionally or alternatively, these also include environmental effects that were not previously devised in the computation of Ai returns, from the raw data measured. Through environmental effects that occur at a temperature, and that have not been considered among the factors Equations (1) and (2), you can count f scale factor that considers these e The partial elemental densities of formation 50 can be verified using a valence. In an example, the sum of all the correlation-capable measuring diameters 50 can be less than or equal to the volume pb, eff of the formation 50, as described in the relationship: rminada based on absolute returns Ai steal for consistency using techniques that relative weights. Specifically, in a pri an elementary concentration of the training will be based on the techniques involving returns, as described above. In a second elemental concentration of the rine formation based on techniques involving rust-seal with relative yields, ribe below with reference to Equations (6) and tion (8). In step 110, the concentration to verify. In some modalities, the step can involve combining the determined concentration based on yields related to a heavy average of the results, on slopes of aluminum (Al) and potassium (K). It is assumed that the formation elements 50 detect measurements of neu capture spectroscopy in quantitatively binding to their oxides or an n in the formation, and that all the oxides are ad. The model takes the form of the following rela + XAIWAI XÍ / YES)] = 1 (6), where Xi is the factor that converts a more common sociation element (for example, Ca in CaC03 instead of CaO), W is the fr of the element in the formation, and is the result of the element derived from the capturing spectrum. A predetermined measurement sensitivity that transverse ection of capture of the element esp sensitivity of the tool to the in describing as elementary returns of normalization to the output of source 18 of n such as Al, Mg, Ca, Si, S may be pre s gamma spectra 58 inelastic and 62 neutron capture. The use of environmentally corrected renders makes it possible to obtain gamma-ray spectra 58inel s 62 gamma electron capture or the use of ammonia as a single solution.

In a way similar to the absolute and relative spectral comparisons, neutron capture gamma, plastic yields and inelastic relative yields S omema 58 inelastic can be compared and, at the same time, combined in an average yield, they can be unaffected by the thermal neutron capturing of the perforation 52. This renders the rennets particularly valuable in high density of perforation 52 and an associated elevated neutron trimming section.

Additionally or alternatively, a second re can be used to verify the calculated densities based on yields Ai a can be used specifically in cases where neutron capture spectroscopy is possible, which can be described in Patent d 61,057, "METHOD Y DEVICE TO DETERMINE CONCEN ENTALES FOR SPECTROSCOPY TOOLS A ", which is incorporated by reference in the prese training with a technique that involves renuat and obtain the elemental concentration using a technique of oxide closure, you can check center yes. A given determined elementary entry based on earnings can be combined with the completed concentration based on relative returns and c or to obtain a heavy average of the resulting heavy weights can have constant weight or a confidence calculation weight. The comparison of elementary inputs based on yields with absolute elementary absolute concentrations can also be used for the scale factor f, forcing the two concentrations to agree on known zones or

Claims (1)

1. INDICATIONS 1. - A system that comprises a downhole tool that buys a neutron source configured to form an underground formation for inelastic scattering events and cation events; a neutron monitor configured to account for the neutrons emitted; Y a gamma-ray detector configured for gamma-ray scepters that are derived from at least inelastic gamma rays produced by the inelastic and gamma rays of capture of solutes by neutron capture events; "absolute configuous data processing circuit based at least in part on environmental orrection that considers at least environmental effects on neutrons emitted, inelastic, gamma rays capturing neu of any combination thereof. 3. - The system of conformity indication 1, where the process circuit is configured to determine the absolute re-ental based at least in part on environmental correction that counts at least on p a fraction of the neutrons emitted from a region of the Underground gamma-ray formation is sensitive to: Geometric effects in a variation of: rums in the region of the underground formation underground process to which the gamma deth is sensitive; or an epitérmic thermal neutron flux of the underground formation to which it is gamma-ray sen- sor; or any combination of them. 4. - The indication compliance system 1, wherein the process circuit is configured to determine the absolute response based at least in part on environmental correction which is a function of u meters related to a m more characteristic to underground formation. 5. - The system of conformity indication 1, where the circuit processes a density of the underground formation; a cross section of icos capture of the underground formation; a cross-section of icos capture from the perforation in the formation will underlie a calculation of neutron flux in an underground formation to which the det s-gamma is sensitive; a calculation of energy distribution of the region of the underground formation to which it is gamma ray emitter; a regime of crude account of mo rones; or a gamma-ray gamma-ray count regime; or relative share divided by the neutron regime emitted. 7. - A method that includes: emit, using a source of known neutron neutron to an erroneous neutron source to cause scattering events in neutron capture events; to measure, using a gamma ray detector, gamma-ray sensors of inelastic gamma rays caused by inelastic dispersion and gamma rays of c rones caused by the events of ca lons, to determine, using a processor, a reference of an element of the light spectrum to determine, using the processor, a 9. - The method of compliance with the reivi n where the concentration of the element is determined in part on the sensitivity dependent on the element-dependent sensitivity to count by. a cross-section of the gamma-ray iplicities associated with the elem a response of the gamma-ray detector of the element; or an atomic weight of the element; or any combination of them. 10. - The method of conformity indication 7, which comprises determining, or determining, a concentration of the element in the ground based at least in part on the downhole solution containing the phonons and the gamma ray detector; a constant containing a fractionation of the downhole tool that produces neutrons and the gamma ray detector under known conditions; or a constant dependent on depth; or any combination thereof. 12. - The method of compliance indication 10, where the concentration of the rmina based at least in part on the f, wherein the scale factor is an indicator to compensate for environmental or: rumental effects related to a gamma ray detector degradation, or a combi indication 7, which comprises determining, or determining, a concentration of the element in the errata based when less in part in the mulling of the element and determining, using the process of entry of the element in the underground formation at least partly in a normalization of the element's relative strength. 15. - The method of conformance indication 14, which comprises determining, u sador, a heavy average of the concentration in the underground formation based on e in the absolute return of the element entry of the element in the underground formation at least in part in the normalization of The relative strength of the element, where the metaphor is based at least in part on the rule of relative performance of the element. 17. - A system that includes: A downhole tool sets up a known approximate amount of underground formation neutron and to detect gamma-ray spectra that result when the idos interact with the underground formation; and the data processing circuit configures a relative performance of a gamma-ray element and to determine an element rejuvenation based at least on the partisation of the relative performance of the known approximate element of neutrons emitted. when 19. - The indication compliance system 17, in which the background tool configured to emit an approximate amount of neutrons using a neutron generator, the neutron output is monitored by a model. 20. - The indication compliance system 17, where the background tool configured to emit the approximate amount of neutrons towards the underground formation at a time to cause ineligible scattering events 21. - The indication compliance system 17, wherein the background tool configured to emit the approximate amount neutrons towards the underground formation at an indication 17, wherein the process circuit is configured to determine the performance element based at least in part on the environmental ection, where the c-factor is a factored function. 24. - The indication compliance system 17, where the process circuit is configured to determine the element's reli- gion based at least on environmental correction pair, where the environmental function is a dependent function in meters related to one or more characteristic is the underground formation, where the data cir- cumulation is configured for trends of the environmental correction factor and 26. - The indication compliance system 17, where the process circuit is configured to determine the element's resolution based at least on environmental correction pair, where the environmental function includes a scale factor of a relation between the absolute performance determined and a determination of an element concentration in the underground formation, in absolute concentration rmination - the relative performance of the known approximate element of emitted neutrons is not balanced. 27. - A method that includes: emitting, using a neutron source downhole branch, an amount to be determined, using a processor, a partial repo of an element in the formation of its gamma-ray spectra; determining, using a processor, a partial repo of the element in the perforation of other gamma rays; Y determining, using the processor, a partial re-shaping of the element in the formation its at least partly in a partial relative normalization of the element in the horizontal to the approximate known amount of idos and determining, using the processor, a partial rejection of the element in the perforation bases S partly in a normalization of the ial field of the element in the perforation to the 29. - The method of conformity indication 27, where the relative performance element in the underground formation was determined a spectral norm of the element in the erránea and where the relative performance pair in the perforation is determined based on the spectral norm of the element ación underground and a spectral norm of the erforation. 30. - A system that includes: a downhole tool that buys a neutron source configured for an underground formation; a neutron monitor configured for the neutron neutron count scheme to determine an absolute performance of the subterranean element based at least on the relative part of the multiplied element of the gamma-ray count regime divided by the neutron count model. 31. - The indication compliance system 30, where the background tool renders a neutron detector closer to the gamma detector than the neutron source. 32. - The indication compliance system 30, where the process circuit is configured to determine the. rebate of the element based at least in par envirmental correction, where the environmental f ection, it depends on an epitérmic neutron flux of the underground formation at which the detector a is sensitive; depends on a gamma attenuation in the underground orifice that is sensitive to the detector; contains a correction for gamma ray variations in a wellbore housing, or it contains a calculation of a number at ientos in the region of the subterranean formation ible gamma ray detector; or any combination of them. IN OF THE INVENTION Systems and are provided. methods for absolute elementary inputs of an erratic gamma ray spectroscopy device. In one example, a system for absolute caliing of an element in an errant may include a background tool for data processing. The well tool may include a source of neutrons leading to the formation, a neutral monitor emitting a gamma-ray emission neutron count regimen to obtain radar spectra at least a part of the gamma rays induced by events of inelastic dispersion and neutralization of neutrons produced by events of c UMEN OF THE INVENTION Systems and methods are provided for absolute elementary centrations of an Indra gamma spectroscopy terrestrial. In one example, a system for absolute loss of an element in an errant can include a tool for the background of data processing. The well tool may include a source of neutron rhons towards the formation, a neutron monitor a gamma-ray emitting neutron count regime to obtain spectra of at least a portion of gamma rays induced by scattering events. inelastic and neutralization of neutrons produced by events of