The organic matter
abundance, type and maturity have been studied along with their generative
potential in coals, carbonaceous mudstones and mudstones from
Carboniferous-Permian in Ordos Basin, revealing that the coal-bearing source
rocks in the study area have the stronger generative potential. The source
rocks are typically humic gas source rocks with the main source rock dominated
by the coals. There are significant diversities in the generative potential in
different lithological source rocks. The generative potential decreases in the
following order: coals, carbonaceous mudstones, mudstones. The desmocollinite
in vitrinite group shows a positive correlation with hydrogen index (IH) or S1 + S2 values, indicating the desmocollinite in coal may be the major contributor to hydrocarbon generation. On the whole,
the hydrogen index and S1 + S2 values both exhibit a
good relationship with the desmocollinite in carbonaceous mudstones or
mudstones, whereas they have a poor correlation
with the pristane/phytane ratios. The hydrogen index and S1 + S2 values in coal with the
increased pristane/phytane
ratios in coal both increase at first and then decrease, whereas they both have
a poor correlation with the desmocollinite. These results show that
the generative potential in coal is mainly related with the sedimentary
environment, while the hydrocarbon generation matter is the main factor influencing
the generative potential in carbonaceous mudstones or mudstones.
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