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
2018-08-03
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Scietntific Research Publishing
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 as- sessing 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 li- mestone. 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 pa- rameters 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 impermea- ble, that might have been affected by the geology of the area where high con- tent 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 satura- tion indicate that the quality of Mpapai prospect is poor.
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Keywords
Lithology, Hydrocarbon, Mpapai, Reservoir, Geology
Citation
Lyaka, A.L. and Mulibo, G.D. (2018) Petrophysical Analysis of the Mpapai well Logs in the East Pande Exploration Block, Southern Coast of Tan- zania: Geological Implication on the Hy- drocarbon Potential. Open Journal of Ge- ology, 8, 781-802. https://doi.org/10.4236/ojg.2018.88046