Elemental concentration determination using neutron-induced activation gamma radiation

摘要

The present disclosure relates to borehole logging methods and apparatuses for estimating formation properties using nuclear radiation, particularly an apparatus and method for estimating amounts of silicon and/or oxygen in the formation using exposure time information. The method may include using nuclear radiation information from at least one nuclear radiation detector to estimate at least one parameter of interest. The method may also include reducing an error in the estimated formation properties due to speed variations of a nuclear radiation source that activates the silicon and oxygen in the formation. The apparatus may include at least one nuclear radiation detector. The apparatuses may include an information processing device to perform the methods.

主权项

1. A method for estimating at least one parameter of interest of a formation, comprising:
estimating the at least one parameter of interest using information from at least one nuclear radiation detector in a borehole in the formation representative of nuclear radiation from an activated volume of interest in the formation, and exposure time information relating to exposure of the activated volume to at least one energy source, comprising:
estimating exposure time information using variations in speed of at least one of: i) motion of the at least one energy source; and ii) motion of the at least one radiation detector.