Seismic Sequence Stratigraphic Analysis Of The Douala Basin, Cameroon

Abstract

This paper was preparad for presentation at the Offshors Technology Confarance hekl in Houston, Texaa M L@ 1999.TIILS paperwsssekted for presenfsfion lV the OTC Prqrsm Comnilfee following rwiew G4information mntained in an atid subm"tiecf by the aufhoqs). Wntents of the PVC% ss Pr-nf4 haw nb een reubwed IV ttm Offstmre Tedmolcgy Ccmkmnca and am subject to scmcfian by the author(s). The msteriaãs presented, does not nes-assarily mflecf any pcdion G4the Offshore %chnolcgy Conference or its officem. Elecfronis rs?pmducfkm,distribution, or sfotage of any pat c+this psper for mmmercial purposes wfthcuf the wdtten ccmsenf d the Offshore Technokgy Conference is prohibted. l%rm"eeion to reproduce in prirt is rsstrkted to en abstrad c+ not mere than S03 wrdq illusfmficmmay net ba mpisd. The abstract nwsf contain sompicuous aciawwledgmenf of where and ty whom the paper was presented. ABSTRACTThe Douala Basin is a divergent basin along the West African coast whIeh developed by rifting between Aftiea and South America during break-up of Gondwanaland. This rifting rsuited in the formation of a break-up unconformity near the beginning of Albian time. Biostratigraphic analysis of the Kribi R-1, Kribi N-1 and Campo R-1 wells indicates that the b-p unconformity developed approximately 107.5 million years ago. Although the break-up unconformity developed by teetonic processes, erosion along it was increased by sea-level fall. Wells which penetrate thk unconformity exhibit thick sequenees of non-marine sands. Production in the Sanaga Sud Field oeeurs in these strata. Seismic interpretation is mostly in the Late Cretaceus to Pliocene strata. Late Cretaeeous stmta are relatively tldck in the central and northern portion of the Douala Basin and thin near stmctmal highs in the vicinity of the IQibi R-1, Kribi N-1, KribI B-1 and Campo R-1 wells. Seismic data indicates that strata thicken to the north. The Late Cketaceous sequences identi.fkd are the 98. 0,94.0, 90.0, 80.0, 77.5,75.0, 71.0 and 68.0 Ma boundaries. Deposition occurred in outer neritic water depths over much of the basin including the area near the KribI R-1 and Campo R-1 wells. The sediments in the onshore Kwa-Kwa 2X and offshore Yxsoukou Marine-1 wells are interpreted as slope deposition. This indicates that the basin extended for some distance into onshore Camerccm along au embayment separated from the offshore Niger delta by the Cameroon Volcanic Line.-"

Seismic Geomorphology of a Late Cretaceous Turbidite Channel system in Deepwater Kribi/Campo sub-basin, offshore Cameroon

“…The post-rift sequence in the study area is characterized by sand-rich turbidity channel belts and basin floor to toe-of-slope fans (Wornardt, 1999;Sterling, 2010;Le, 2012;Iboum et al, 2016;Loule et al, 2018;Yugye et al, 2021) (Fig. 2).…”

“…In the more proximal settings (i.e., east of Kribi-Campo High), there are multiple submarine incisions of several kilometres wide and some amalgamated cut-and-fill submarine channel complexes downslope and parallel to present-day shelf-break for most of the Paleocene section (Wornardt, 1999;Le, 2012;Iboum et al, 2016). The late Eocene-early Oligocene tectonic event facilitated a relative sea-level fall, responsible for the widespread erosion and non-deposition in the deep-water of Douala Basin (Wornardt, 1999;Helm, 2009;Mvondo, 2010;Iboum et al, 2016;Ngo et al, 2018;Le, 2021) (Fig. 2).…”