Studies on the matrix effect in Pyrolysates of pre-treated organic rich sediments

摘要

11 samples have been chosen for this study on the basis of their Rock Eval data. 11 oil shales, and one organic rich lignites come from Hungary. The samples are immature (R_o＜0.4%). The age: is Tertiary (Miocene: 1, and 11 Pliocene samples). Distribution of samples on type: Type Ⅰ: 4, Type Ⅱ: 6 and Type Ⅲ: 1 samples. Kerogen samples (common organic solvent and non-oxidising mineral acid insoluble organic fraction of rocks) were prepared, and their C, H, N, S and Fe contents were determined, and pyrolysed. The elemental analyses gave information of gross composition of kerogen (kerogen types are determined by the atomic ratios: H/C, O/C), but without any estimation of the hydrocarbon product distribution. Pyrolysis-gas chromatography (Py-GC) provides a direct compositional link with products expected to be formed from kerogens offering a more detailed insight into kerogen structure. Numerous homologue series have been found in pyrolysates and both their relative and absolute abundances have been exploited to infer precursors, extent and type of diagenetic processes and level of early catagenesis.