Controls on the Prevalent Occurrence of Cretaceous Oil Sands by Timothy Bata (MAOPS)-Lupine Publishers
The widespread occurrence of Cretaceous oil sands can be attributed
to various geological processes, most of which can be
linked to the warm climatic conditions that prevailed globally at that
time. The extreme global warmth witnessed during the
Cetaceous caused a rise in global sea level, which resulted in flooding
of most continental margins, depositing transgressive sands
at shallow depths directly on the Precambrian basement, or much older
sedimentary strata. Another important geological factor
that contributed to the widespread occurrence of the Cretaceous oil
sands was the availability of viable petroleum source rocks that
generated oils at the time of, or shortly after, the Cretaceous oil
sands were deposited. Oils migrated into the shallow Cretaceous
reservoir sands through the plane of unconformity underlying them. The
warm climatic conditions witnessed in the Cretaceous also
implied that the reservoir had conditions that were favourable for
optimum microbial activities.
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