MATURITY OF KEROGEN AND ASPHALTENES DETERMINED BY PARTIAL-LEAST-SQUARES (PLS) CALIBRATION AND TARGET PROJECTION OF DIFFUSE REFLECTANCE FOURIER TRANSFORMED INFRARED-SPECTRA

被引:24
作者
CHRISTY, AA
KVALHEIM, OM
OYGARD, K
DAHL, B
KARSTANG, TV
机构
[1] NORSK HYDRO AS,N-5001 BERGEN,NORWAY
[2] STATOIL,GEOLAB,N-4001 STAVANGER,NORWAY
关键词
DIFFUSE REFLECTANCE; I R SPECTROSCOPY; MULTIVARIATE CALIBRATION; TARGET PROJECTION; MATURITY FACTOR; KEROGEN; ASPHALTENES;
D O I
10.1016/0146-6380(91)90040-Q
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Maturation of sedimentary organic matter expressed as: (1) vitrinite reflectance; (2) depth within the same geological formation; and (3) pyrolysis temperature in hydrous pyrolysis experiments is assessed by diffuse reflectance i.r. spectroscopy either using an index defined from intensities of specific peaks or through a multivariate calibration of the spectral profiles with their respective maturation indicators as dependent variables. The samples were of three kinds: (a) kerogen samples (46) of varying maturity from the North Sea; (b) asphaltene samples (108) prepared from sediments obtained from two different wells and a reservoir from the North Sea; and (c) asphaltene samples prepared from hydrous pyrolysate of a sediment containing type II kerogen. The spectra show that the following chemical processes take place during maturation: (i) elimination of carbonyl groups; (ii) depletion of aliphatic chains; and (iii) increase in aromatic content. The univariate index, although sensitive to changes in organic facies, seems applicable within the oil window with the best results obtained for type III kerogen. Multivariate calibration of kerogen samples reveals the capability of the PLS method for predicting vitrinite reflectance. Target projections of the PLS components provide validated spectral profiles, related to the collective changes taking place during both natural and simulated evolution.
引用
收藏
页码:63 / 74
页数:12
相关论文
共 31 条
[1]  
ALPERN B, 1969, ANN SOC GEOL NORD, V89, P143
[2]  
BEHAR F, 1984, ORG GEOCHEM, V6, P585
[3]  
BENYBASSEZ C, 1985, SCANNING ELECTRON MI, V1, P119
[4]   QUANTITATIVE-DETERMINATION OF THERMAL MATURITY IN SEDIMENTARY ORGANIC-MATTER BY DIFFUSE REFLECTANCE INFRARED-SPECTROSCOPY OF ASPHALTENES [J].
CHRISTY, AA ;
HOPLAND, AL ;
BARTH, T ;
KVALHEIM, OM .
ORGANIC GEOCHEMISTRY, 1989, 14 (01) :77-81
[5]   MULTIVARIATE CALIBRATION OF DIFFUSE REFLECTANCE INFRARED-SPECTRA OF COALS AS AN ALTERNATIVE TO RANK DETERMINATION BY VITRINITE REFLECTANCE [J].
CHRISTY, AA ;
VELAPOLDI, RA ;
KARSTANG, TV ;
KVALHEIM, OM ;
SLETTEN, E ;
TELNAES, N .
CHEMOMETRICS AND INTELLIGENT LABORATORY SYSTEMS, 1987, 2 (1-3) :199-207
[6]   LOW-PRESSURE, AUTOMATED, SAMPLE PACKING UNIT FOR DIFFUSE REFLECTANCE INFRARED SPECTROMETRY [J].
CHRISTY, AA ;
TVEDT, JE ;
KARSTANG, TV ;
VELAPOLDI, RA .
REVIEW OF SCIENTIFIC INSTRUMENTS, 1988, 59 (03) :423-426
[7]   STRUCTURAL FEATURES OF RESINS, ASPHALTENES AND KEROGEN STUDIED BY DIFFUSE REFLECTANCE INFRARED-SPECTROSCOPY [J].
CHRISTY, AA ;
DAHL, B ;
KVALHEIM, OM .
FUEL, 1989, 68 (04) :430-435
[8]  
DURAND B, 1972, REV I FR PETROL, V27, P865
[9]   DIFFUSE REFLECTANCE INFRARED SPECTROMETRY OF POWDERED COALS [J].
FULLER, MP ;
HAMADEH, IM ;
GRIFFITHS, PR ;
LOWENHAUPT, DE .
FUEL, 1982, 61 (06) :529-536
[10]   APPLICATION OF INFRARED-SPECTROSCOPY TO THE CLASSIFICATION OF KEROGEN-TYPES AND THE EVALUATION OF SOURCE ROCK AND OIL-SHALE POTENTIALS [J].
GANZ, H ;
KALKREUTH, W .
FUEL, 1987, 66 (05) :708-711