kerogen

% and yield hydrogen index values ranging from 282 to 510 mg HC/g TOC with low oxygen index values, consistent with Type II and mixed Type II-III kerogens. The coal samples have vitrinite reflectance values in the range of 0.47-0.67 Ro %, indicating immature to early mature (initial oil window).

Organic matter in these source rocks is primarily type I sapropelic and [II.sub.1] humic-sapropelic kerogens and exhibits similar biomarker composition but different [delta][sup.13]C values [1-3].

Characterization of organic nitrogen and sulfur in the oil shale kerogens. Fuel Process.

HI (17-395 mg HC/g TOC) and [S.sub.2]/[S.sub.3] (0.15-11.4) ratio values imply that the samples contain mostly Type III kerogen with minor Type IV and Type II/III kerogens.

In most samples organic matter (OM) consists predominantly of type I and II kerogens, showing high oil generative potential, whereas three samples, which contain type II kerogen with a certain input of type III kerogen, demonstrated potential to produce both, oil and gas.

Nitrogen chemistry of kerogens and bitumens from X-ray absorption near-edge structure spectroscopy.

The organic matter (OM) of HD oil shale belongs to type I kerogen, that of YJ oil shale is type II kerogen, whereas the OM of MM oil shale appears to be between type I and type II kerogens [20].

The dominant oxygen-containing compounds in the pyrolysates of Mol and Bure kerogens were furanic derivatives, which were quite few in the Dachengzi oil shale pyrolysates.

Structural and isotopic analysis of kerogens in sediments rich in free sulfurised Botryococcus braunii biomarkers.

Thermal decomposition behavior of oil shale kerogens observed by stepwise pyrolysis gas chromatography.

To prepare kerogens, fragments of rock were leached in 12 N HCl for 12 h to remove carbonates, then washed several times with distilled water and treated with hydrofluoric acid (HF) for 12 h to remove silicates [20].