GAMMA RAY SPECTRA CONTRAST SHARPENING

Methods and apparatus for estimating parameters of interest of a volume in an earth formation from a response spectrum representing radiation information obtained by a radiation detector in a borehole intersecting the volume responsive to nuclear phenomena in the volume, the response spectrum includ...

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Bibliographic Details
Main Authors ANNIYEV, Toyli, CHACE, David, VASILYEV, Maxim, INANC, Feyzi
Format Patent
LanguageEnglish
French
German
Published 29.07.2020
Subjects
DETECTING MASSES OR OBJECTS
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
MEASURING
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
PHYSICS
TESTING
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Summary:Methods and apparatus for estimating parameters of interest of a volume in an earth formation from a response spectrum representing radiation information obtained by a radiation detector in a borehole intersecting the volume responsive to nuclear phenomena in the volume, the response spectrum including spectral distortion resulting i) environmental conditions in the formation, or ii) deterioration of at least one component of the radiation detector. Methods include recovering an enhanced response spectrum estimating the true spectrum, comprising mitigating the spectral distortion by applying at least one contrast sharpening mask to the response spectrum. The at least one contrast sharpening mask may comprise at least a low pass smoothing mask subtracted from a unity mask which when applied to the response spectrum obtains high-frequency data and adds the high-frequency data to the response spectrum. The response spectrum may be a gamma ray spectrum.
Bibliography:Application Number: EP20180858071