The reservoir quality of the Cotton Valley
sandstones is mainly controlled by depositional environment
and subsequent diagenetic overprint. Bioturbation generally
results in deteriorating reservoir quality, but it was
responsible for preserving porosity in the sandstones. Clean
bioturbated sandstones (with less than 10% clay matrix) show
the highest porosity and permeability among the other
facies. Petrographic analysis of the various facies
indicates that three main parameters influenced...