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US 9,310,513 B2Granted
Method and apparatus for borehole logging
AssigneeSouthern Innovation International Pty Ltd
InventorsPaul Andrew Basil Scoullar, Robin John Evans, Christopher Charles McLean
Life of this patent
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Abstract
A method and apparatus for borehole logging, the method comprising collecting detector output data from a radiation detector of a borehole logging tool, and resolving individual signals in the detector output data by (i) determining a signal form of signals present in the data, (ii) making parameter estimates of one or more parameters of the signals, wherein the one or more parameters comprise at least a signal temporal position, and (iii) determining the energy of each of the signals from at least the signal form and the parameter estimates. The logging tool is shorter, logging tool speed is greater, dwell time is shorter and/or resolution is improved.
Claims36
A method of borehole logging, comprising:
- receiving radiation at a radiation detector from a material;
- collecting detector output data from the radiation detector based on the received radiation;
- and
- resolving individual signals corresponding to individual radiation detection events in the detector output data by:
- obtaining or expressing the detector output data as a digital series,
- obtaining or determining a signal form of the individual signals,
- forming a transformed signal form by transforming the signal form into a transform space according to a mathematical transform,
- forming a transformed series by transforming the digital series into the transform space according to the mathematical transform,
- obtaining a function output in the transform space based at least in part on the transformed series and the transformed signal form,
- estimating the function output as a plurality of oscillating functions, each corresponding to one of the individual signals in the detector output data,
- determining at least one of an amplitude and a frequency of each of the functions, and
- determining an energy of each of the individual signals based on the at least one of the amplitude and the frequency of the corresponding function.
9 more elements
A method of mineral logging, comprising:
- receiving radiation at a radiation detector from a material;
- collecting detector output data from the radiation detector based on the received radiation;
- and
- resolving individual signals corresponding to individual radiation detection events in the detector output data by:
- obtaining or expressing the detector output data as a digital series,
- obtaining or determining a signal form of the individual signals,
- forming a transformed signal form by transforming the signal form into a transform space according to a mathematical transform,
- forming a transformed series by transforming the digital series into the transform space according to the mathematical transform,
- obtaining a function output in the transform space based at least in part on the transformed series and the transformed signal form,
- estimating the function output as a plurality of oscillating functions, each corresponding to one of the individual signals in the detector output data,
- determining at least one of an amplitude and a frequency of each of the functions, and
- determining an energy of each of the individual signals based on the at least one of the amplitude and the frequency of the corresponding function.
9 more elements
A borehole logging apparatus, comprising:
- a borehole logging tool configured to irradiate a material surrounding the logging tool, detect radiation emitted by the material, and output detector data based on the detected radiation;
- and
- a processor configured to receive the data as a digital series, and programmed to:
- obtain or determine a signal form of individual signals present in the data,
- form a transformed signal form by transforming the signal form into a transform space according to a mathematical transform,
- form a transformed series by transforming the digital series into the transform space according to the mathematical transform,
- obtain a function output in the transform space based at least in part on the transformed series and the transformed signal form,
- estimate the function output as a plurality of oscillating functions, each corresponding to one of the individual signals in the detector output data,
- determine at least one of an amplitude and a frequency of each of the functions, and
- determine an energy of each of the individual signals based on the at least one of the amplitude and the frequency of the corresponding function.
7 more elements
A mineral logging apparatus, comprising:
- a mineral logging tool configured to irradiate a material surrounding the logging tool, detect radiation emitted by the material, and output detector data based on the detected radiation;
- and
- a processor configured to receive the data as a digital series, and programmed to:
- obtain or determine a signal form of individual signals present in the data,
- form a transformed signal form by transforming the signal form into a transform space according to a mathematical transform,
- form a transformed series by transforming the digital series into the transform space according to the mathematical transform,
- obtain a function output in the transform space based at least in part on the transformed series and the transformed signal form,
- estimate the function output as a plurality of oscillating functions, each corresponding to one of the individual signals in the detector output data,
- determine at least one of an amplitude and a frequency of each of the functions, and
- determine an energy of each of the individual signals based on the at least one of the amplitude and the frequency of the corresponding function.
7 more elements
Dependencies are inferred from the claim text.