Petrophysical Analysis of the Mpapai well Logs in the East Pande Exploration Block, Southern Coast of Tanzania: Geological Implication on the Hydrocarbon Potential
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Date
2018
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Publisher
Open Journal of Geology
Abstract
This study presents results of log analysis from Mpapai well, which is located
in the East Pande Block, southern coast of Tanzania. The study aimed at assessing
the hydrocarbon potential of lithological units encountered during
drilling of Mpapai well. To achieve the general objective, suites of wire-line
logs from Mpapai well were used for the analysis. Based on wire-line logs,
three types of lithology were identified which include sandstone, shale and limestone.
Seven sandstone bodies marked as MpapaiA, B, C, D, E, F and G
were identified with their tops and bases at the depth interval from 3004 m to
4008 m. Four zones among seven sandstones bodies marked as MpapaiB, E, F
and MpapaiG were identified as reservoir zones. Computed petrophysical parameters
for the four reservoir zones gave an average total porosity ranging
from 14% to 21% with low permeability in the range of 3.92 mD to 13.67 mD.
The low permeability indicates that the reservoir sand bodies are impermeable,
that might have been affected by the geology of the area where high content
of clay minerals reduces permeability due to filling in open spaces. The
fluid type defined in the reservoir zones is basically water with high saturation
greater than 75%, which indicates that the proportion of void space occupied
by water is high, consequently low hydrocarbon saturation and production.
Despite of fair to good porosity, the low permeability and high-water saturation
indicate that the quality of Mpapai prospect is poor.
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Keywords
Lithology, Hydrocarbon, Mpapai, Reservoir, Geology