Petrophysical evaluation of the Oligocene Reservoirs in Well A13-NC59, Gialo Field, NC59 Concession, Southeast Sirt Basin, Libya

Document Type : Original Article

Authors

1 Department of Geology, Science, Mansoura University, Mansoura, Egypt

2 Department 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.

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