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Mount Cameroon oil seeps and their rheological properties

The geology of the Gulf of Guinea, at the southeastern foot of Mount Cameroon presents a transition from a sedimentary terrain to a volcanic terrain marked by the presence of anactive Cameroon Mountain. The presence of seeps at the foot of this Mountain could serves as an indication for more onshore exploration in the area. Samples from these seeps were collected for rheological studies at temperatures ranging from 20.4 o C to 60.1 o C using a Brookfield DV-II Pro viscometer. Such studies were necessary to investigate the change in rheological properties of seeps after long exposure to the surface. The measurements provided for the percentage torque at given speeds, shear stress and the apparent viscosity data at various shear rates and at different temperatures. The seep samples exhibit a Newtonian behavior as the shear rate was varied from 0.17-32.64 s − 1 , and as such, the Newtonian model could be used to describe their rheological behavior. The viscosity of the seep sample reduced from 10918cP (at 20.4 o C, 0.17 s − 1) to 303.2cP (at 60.1 o C, 21.42 s − 1). The degree of viscosity reduction increases significantly from 0% to 97.2% over the investigated temperature range.

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