Abstract:

Depending on subsurface samples and test data, the authors use analytic methods of Rock-Eval, microscopic observation, organic elemental analysis, vitrinite reflectance and biomarkers comparatively to analyse the organic geochemical characters of the Mesozoic source rocks in T₃y and J₂y of Zhenyuan in Ordos Basin. The multidisciplinary analyses indicate that the source rocks of T₃y and J₂y have high organic content, high generating capability of liquid hydrocarbon. The kerogens of source rocks are mainly humic kerogen. Organic matters are now in the maturation period of hydrocarbon generation and have already come into the generative window. Organic matters of T₃y were accumulated and preserved in the reducing environment of lacustrine facies, and organic matters of J₂y in weak-reducing environment of shallow lacustrine and paludal facies. So source rocks of T₃y are much better than those of J₂y.

Key words: source rock, organic matter, kerogen, biomarker, Ordos Basin