Environmental corrections in nuclear spectroscopy using variable element ratio

A spectrum analysis, nuclear spectrum technology, applied in the exploration of nuclear radiation, measuring devices, instruments, etc., can solve problems such as impact

Inactive Publication Date: 2014-04-23
PRAD RES & DEV LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Another disadvantage is that the environmental conditions of the formation can vary from well to well and also with depth within a particular well, which can affect the energy spectrum measured using LWD neutron-gamma spectroscopy

Method used

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  • Environmental corrections in nuclear spectroscopy using variable element ratio
  • Environmental corrections in nuclear spectroscopy using variable element ratio
  • Environmental corrections in nuclear spectroscopy using variable element ratio

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Embodiment Construction

[0032] One or more specific embodiments of the present disclosure, including method, apparatus, and system embodiments, are described below. These described embodiments and their respective various elements are merely examples of the presently disclosed technology. Structural aspects of the disclosed apparatus provide means for carrying out the various aspects of the disclosed methods. It should be appreciated that in the development of any such actual implementation, such as in any engineering or design project, a number of implementation-specific decisions may be made to achieve the developer's specific goals, such as compliance with system-related and business-related constraints, The goals may vary by implementation. Moreover, it should be appreciated that such a development effort might be time consuming, but would nonetheless be a routine undertaking of design, fabrication, and production for those of skill in the art having the benefit of this disclosure.

[0033] Whe...

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Abstract

A method for estimating an aspect of a formation using a nuclear spectroscopy tool includes placing a nuclear spectroscopy tool into a borehole and emitting neutrons such that some of the neutrons generate gamma rays from a formation adjacent the nuclear spectroscopy tool and some of the neutrons generate gamma rays from elements within the nuclear spectroscopy tool. An energy spectrum of gamma rays induced by the emitted neutrons can be detected. The energy spectrum includes a background having a plurality of measured spectral components. A background ratio between at least one spectral component of the background and another measured spectral component can be determined or estimated in accordance with environmental measurements. The detected gamma ray spectra can be analyzed using a combination of standard spectra and subtracting at least one spectral component of the background in accordance with the background ratio.

Description

[0001] related application [0002] This application claims priority to U.S. Provisional Patent Application Serial No. 61 / 489,287, filed May 24, 2011, entitled "SYSTEMS AND METHODS FOR ENVIRONMENTAL CORRECTIONS IN NUCLEAR SPECTROSCOPY USING VARIABLE ELEMENT RATIO," the entire contents of which Incorporated herein by way of incorporation by reference. technical field [0003] The present disclosure relates broadly to nuclear spectroscopy, and more particularly to systems and methods for estimating and accounting for environmental effects on nuclear spectroscopy results. Background technique [0004] When drilling through rock formations or other formations in order to obtain oil, gas, or other materials, it is beneficial to determine or estimate the type of formation being drilled through. For example, information about formation type can be used to more accurately interpret other well log measurements to estimate formation porosity, water saturation, net hydrocarbon content...

Claims

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Application Information

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IPC IPC(8): G01V5/10
CPCG01V5/101
Inventor J·A·格劳J·迈尔斯M·贝雷德
Owner PRAD RES & DEV LTD
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