Abstract
The quick-look and gas chromatography analyses were used for formation evaluation of four depth intervals in a well (well A) located within the offshore of the Rio Del Rey basin. The results show 3 water reservoirs (R1 to R3) and 1 hydrocarbon reservoir (R4). The quick-look reveals that the hydrocarbon (oil and gas) reservoir is a shaley sandstone or a radioactive sandstone located between 4898-4932 Mmd which is filled by oil and gas and with a good porosity. The chromatographic gas ratio analysis reveals that the hydrocarbon reservoir is filled by a productive gas which may be a wet gas. The result provided by the gas chromatography is a false result probably due to its limitation which is that the hydrocarbon component must exist at the gaseous phase (C1-C5) to be detected and analyzed. The gas chromatography based its analysis only in the C1 to C5 range, in oil we have from C1 to C8.
Highlights
Rio Del Rey basin (RDR) is one of the petroliferous sedimentary basins lining the coast of West Africa
The Rio del Rey basin is further limited in the north and northeast by the Precambrian Oban massif basement and Rumpi volcanics, in the northwest it is limited by the Niger Delta, in the south offshore, it is limited by the Rio muni basin in Equatorial Guinea and in the south-east by the Cameroon Volcanic Line (CVL) .It is located between 4° and 5°of latitude north and between 8°20’ and 9°10’ of longitude east (Fig. 1)
The major problem encountered during this work was the difficulty to provide an interpretation to results obtained after using quick-look and chromatographic gas ratio analysis which were not correlable
Summary
Rio Del Rey basin (RDR) is one of the petroliferous sedimentary basins lining the coast of West Africa. The RDR basin represents the south-eastern extension of the Niger delta which is a prolific hydrocarbon province situated in Gulf of Guinea (Fig. 1). Rio del Rey basin is a divergent passive margin basin found in the southwest of Cameroon (Longmore and Lee, 2010; Njoh, 2018) and represents the south-eastern extension of the Niger delta in the Gulf of Guinea (Coughlin et al, 1993). The tectono-sedimentary story of the Rio Del Rey basin began in the Lower Cretaceous (Berriasian) and comprise six geological Formations (Nely and Vaillant, 1991): a synrift Formation with continental clastics sediments; a post-rift Formation dated Albian made up by an alternation of shale and Carbonates which contains turbidites deposits (Njoh and al., 2013) and four other Formations named Kita, Akata, Agbada and Benin. Made up by an alternation; The deposit of Agbada Formation including deltaic sand and shale over Akata Formation will give rise to a southward gravitational failure (gravity tectonic) of the two Formations (Evamy and al., 1978; Doust and Omatsola, 1990; Rensbergen and Morley, 2003)
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