Enhancing the quality and resolution of an image generated from single or multiple sources
First Claim
1. A method of logging an earth formation while drilling comprising:
- (a) conveying a logging tool into a borehole in the earth formation and rotating the tool therein;
(b) acquiring a plurality of measurements of a parameter of interest of the earth formation during rotation of the tool to obtain a plurality of raw data series wherein each raw data series is acquired with a separate transducer;
(c) denoising at least one of the plurality of raw data series using a multi-resolution wavelet transform to obtain a denoised data series; and
(d) matching the resolution of the denoised data series with at least one of the plurality of raw data series to obtain a resolution matched data series.
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Abstract
The present invention provides a method and apparatus for logging an earth formation and acquiring subsurface information wherein a logging tool is conveyed in a borehole to obtain parameters of interest. The parameters of interest obtained may be density, acoustic, magnetic or electrical values as known in the art. As necessary, azimuths associated with the measurements are obtained and corrections applied. The corrected data may be filtered and/or smoothed. The parameters of interest associated with azimuthal sectors are depth matched, resolution matched and filtered, and the acquisition effects removed. The data are denoised using a multi-resolution wavelet transform. The data acquired with separate transducers are resolution matched to obtain a resolution matched data series. Subsequently the resolution matched data may be further denoised using a multi-resolution wavelet transform.
93 Citations
20 Claims
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1. A method of logging an earth formation while drilling comprising:
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(a) conveying a logging tool into a borehole in the earth formation and rotating the tool therein;
(b) acquiring a plurality of measurements of a parameter of interest of the earth formation during rotation of the tool to obtain a plurality of raw data series wherein each raw data series is acquired with a separate transducer;
(c) denoising at least one of the plurality of raw data series using a multi-resolution wavelet transform to obtain a denoised data series; and
(d) matching the resolution of the denoised data series with at least one of the plurality of raw data series to obtain a resolution matched data series. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wellbore apparatus conveyed in a borehole in an earth formation for determining a characteristic of the formation, the apparatus comprising:
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(a) a logging tool rotatable in the earth formation;
(b) a plurality of sensors for acquiring raw data series associated with each sensor indicative of a parameter of interest; and
(c) a processor for denoising at least one of the raw data series with a multi-resolution wavelet transform to obtain a denoised data series and for matching resolution of the denoised data series with at least one of the plurality of raw data series to obtain a resolution matched data series. - View Dependent Claims (9, 10, 11)
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12. A system for determining a property of an earth formation using a logging tool on a in a borehole, the system comprising:
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(a) at least one transmitter in the logging tool for generating signals into the formation;
(b) a plurality of sensors for receiving raw data series responsive to the generated signals at a plurality of borehole depths, wherein each of the raw data series received is associated with one of the plurality of sensors;
(c) a processor for denoising at least one of the raw data series with a multi-resolution wavelet transform to obtain a denoised data series;
(d) a processor for matching resolution of the denoised data with at least one of the plurality of raw data series to obtain a resolution matched data series; and
(e) a processor for obtaining an image of the borehole with the resolution matched data series. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification