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摘要
A worldwide data set of 1,085 samples containing organic matter of the type II/III kerogen from Carboniferous to Cenozoic was used to analyse the evolution of the hydrogen index (HI), quality index (QI), and bitumen index (BI) with increasing thermal maturity. The HImax, QI(max) and BImax lines were defined, based on statistical analysis and cross-plots of HI, QI and BI versus the vitrinite reflectance (%Ro) and T (max) (A degrees C). The constructed HI, QI and BI bands were broad at low maturities and gradually narrowed with increasing thermal maturity. The petroleum generation potential is completely exhausted at a vitrinite reflectance of 2.0-2.2 % and T (max) of 510-520 A degrees C. An increase in HI and QI suggests extra petroleum potential related to changes in the structure of the organic material. A decline in BI signifies the start of the oil window and occurs within the vitrinite reflectance range 0.75-1.05 % and T (max) of 440-455 A degrees C. Furthermore, petroleum potential can be divided into four different parts based on the cross-plot of HI versus %Ro. The area with the highest petroleum potential is located in "Samples and methods" with %Ro = 0.6-1.0 %, and HI > 100. Oil generation potential is rapidly exhausted at "Results and discussion" with %Ro > 1.0 %. This result is in accordance with the regression curve of HI and QI with %Ro based on 80 samples with %Ro = 1.02-3.43 %. The exponential equation of regression can thus be achieved: HI = 994.81e(-1.69Ro) and QI = 1,646.2e(-2.003Ro) (R (2) = 0.72). The worldwide organic material data set defines two range of oil window represented by the upper and lower limits of the BI band: %Ro 0.75-1.95 %, T (max) 440-525 A degrees C, and %Ro 1.05-1.25 %, T (max) 455-465 A degrees C, respectively.
- 出版日期2013-8
- 单位南开大学
