Abstract
Abstract: The TOF‐SIMS fragment peak ascription of organic and inorganic ions of mineral‐bituminous groundmass of Jurassic source rocks in the Turpan‐Hami and Junggar basins was studied by using the high‐resolution Time of Flight Secondary Ion Mass Spectrometer (TOF‐SIMS). The characteristics of spectrum distribution and constitution of fragment ions of the mineral‐bituminous groundmass are discussed; then the methods of evaluating its hydrocarbon‐generating potential are developed. In addition, the typical parameters, XAL, Yox and ZAR, for indicating the hydrocarbon‐generating potential of mineral‐bituminous and other organic matter in source rocks are put forward to reflect the aliphatic, oxygenous, and aromatic structures. It is confirmed by Rock‐Eval that these parameters are significant in evaluating hydrocarbon generation. Moreover, the detection of the nitrogenous and oxygenous fragment ion, CH5NO3+, in the mudstone formed in semi‐deep lakes and in the carbargilite formed in the arms of lakes reflects the fact that microbes take an active part in biologic degradation.
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