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Data laundering by target rotation in chemistry‐based oil exploration
Author(s) -
Christie Olav H. J.
Publication year - 1996
Publication title -
journal of chemometrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.47
H-Index - 92
eISSN - 1099-128X
pISSN - 0886-9383
DOI - 10.1002/(sici)1099-128x(199609)10:5/6<453::aid-cem444>3.0.co;2-p
Subject(s) - sediment , rotation (mathematics) , chemistry , oil field , mineralogy , residual oil , geology , soil science , petroleum engineering , computer science , artificial intelligence , geomorphology
The target rotation technique can be used for removal of undesired information provided there are variables uniquely connected to such information. Oil seepage in sea‐bottom sediments can be used for oil exploration. The seeped oil constituents may be present in sub‐ppm concentrations and the variation in mineral composition of the sediments and contributions from bioactivity may completely dominate over the chemical fingerprint of the seepage. Target rotation to the clay content of the sediment removes the mineral composition signature, while rotations to unsaturated gases absent in seeped oil remove signatures of non‐thermogenic hydrocarbons. The assignment of samples to a class of samples over a known off‐shore Norway oil field was based on the residual matrix after target rotations that represented only 17% of the total variance of the standardized raw data. The assignment method is very selective and clearly points out another known oil field and suggests one potential oil field in an unexplored area. © 1996 by John Wiley & Sons, Ltd.