发明名称 |
NULL SPACE PROJECTION FOR SOURCELESS GAIN STABILIZATION IN DOWNHOLE GAMMA RAY SPECTROSCOPY |
摘要 |
A method for gain control of a radiation detector includes measuring standard gamma ray spectra for known concentrations of selected radioactive materials found in earth formations. A standards matrix is calculated from the standard gamma ray spectra. A singular value decomposition is computed from a matrix related to measurements of gamma ray spectra of formations and the standards matrix. A radiation detector gain is computed from a minimum ratio of null space with respect to data value space of a subsurface formation measurement related matrix and the standards matrix. Gain of the radiation detector is adjusted based on the computed radiation detector gain. |
申请公布号 |
WO2014055852(A1) |
申请公布日期 |
2014.04.10 |
申请号 |
WO2013US63439 |
申请日期 |
2013.10.04 |
申请人 |
SCHLUMBERGER CANADA LIMITED;SERVICES PETROLIERS SCHLUMBERGER;SCHLUMBERGER HOLDINGS LIMITED;SCHLUMBERGER TECHNOLOGY B.V.;PRAD RESEARCH AND DEVELOPMENT LIMITED;SCHLUMBERGER TECHNOLOGY CORPORATION |
发明人 |
SLOAN, WILLIAM ROBERT |
分类号 |
G01V5/04 |
主分类号 |
G01V5/04 |
代理机构 |
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代理人 |
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