Petrophysical evaluation of the Oligocene Reservoirs in Well A13-NC59, Gialo Field, NC59 Concession, Southeast Sirt Basin, Libya | ||||
| Journal of Environmental Sciences. Mansoura University | ||||
| Volume 52, Issue 1, March 2023, Page 9-13 PDF (622.13 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/joese.2023.186998.1021 | ||||
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| Authors | ||||
AHMED SALIM SAEID  1; Mahmoud Lotfy Leila2; Essam Mahmoud Al- Khouribi2
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| 1Department of Geology, Science, Mansoura University, Mansoura, Egypt | ||||
| 2Department of Geology, Science, Mansoura University, Mansoura, Egypte partment of Geology, Science, Mansoura University, Mansoura, Egypt | ||||
| Abstract | ||||
| The Oligocene sedimentary succession in Gialo Filed, NC59 Concession, SE Sirt Basin, Libya consists of mixed carbonate siliciclastic sedi-ments. The studied succession includes Diba and Chadra rock units which have very good reservoir characteristics in the studied conces-sion. The main objectives of the present work are to evaluate the petrophysical parameters of the Oligocene succession using the available wireline logs from well A13 _NC 59. The Oli-gocene facies is mostly clean with some quartzose sandstone, carbonate-cemented sand and limestone intervals. Presence of laminated clays in the upper Oligocene Chadra B and thick shale and siltstone interbeds in the lower Oligocene Diba Formation results in blocking the pay zone connectivity. Greatest pay zone thicknesses occur in Chadra B and Diba and the zones of best reservoir quality are those enriched in clean sand, non-tight limestone with minimal content of clay and highest ef-fective porosity and lowest water saturation. Dissolution pores are interpreted to be promi-nent in the Diba Formation and Chadra A, C. | ||||
| Keywords | ||||
| Porosity; Permeability; Net to gross; Diba; Chadra | ||||
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