Petrophysical Analysis of Mpera Well in the Exploration Block 7, Offshore Tanzania: Implication on Hydrocarbon Reservoir Rock Potential
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Date
2018-08-03
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Scietntific Research Publishing
Abstract
The present study provides evaluation and estimation of petrophysical para- meters and assessment of lithology and their thicknesses in order to charac- terize present reservoir rocks at Mpera well located in Exploration Block 7, deep offshore Tanzania. To achieve the objectives the wire-line logs, Techlog program was used for assessment, analysis, computation and interpretations of petrophysical parameters and results were integrated through interpreta- tion of well logs. The results from wire-line logs reveal three (3) non hydro- carbon-bearing reservoir rocks i.e., Mpera splay (sandstone), Mpera deep sand 1 (sandstone and limestone) and Mpera deep sand 2 (sandstone and li- mestone) with gross thickness of 94.335 m, 28.905 m and 12.967 m respec- tively. The average permeability values of the reservoir rocks were 9.47 mD, 6.45 mD and 4.67 mD, while average porosity values were 14.57%, 17.4% and 16.75%, with average volume of shale 25.7%, 23.5% and 9.7% at Mpera splay, Mpera deep sand 1 and Mpera deep sand 2 respectively. These results signify poor permeability; good porosity and good quality reservoir in terms of vo- lume of shale. Fluid type defined in the reservoirs was basically water. High water saturation (90.6% - 97.7%) in the reservoir zones of the Mpera well in- dicates that the proportion of void spaces occupied by water is high, thus, in- dicating less than 10% hydrocarbon saturation. The findings indicate that Mpera well reservoir rocks are of low quality with non-hydrocarbon bearing such that it is not potential for hydrocarbon production.
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Keywords
Reservoir, Hydrocarbon, Lithology, Mpera, Offshore
Citation
Mheluka, J.M. and Mulibo, G.D. (2018) Petrophysical Analysis of the Mpera Well in the Exploration Block 7, Offshore Tanzania: Implication on Hy- drocarbon Reservoir Rock Potential. Open Journal of Geology, 8, 803-818. https://doi.org/10.4236/ojg.2018.88047