Postrift depositional evolution and sequence stratigraphy from offshore subsurface data of the Kribi-Campo subbasin (Cameroon, West African margin)

被引:8
作者
Kissaaka, Joseph Bertrand Iboum [1 ]
Ntamak-Nida, Joseph Marie [1 ]
Mvondo, Francois [1 ]
Kwetche, Paul Gustave Fowe [1 ]
Nitcheu, Adrien Lamire Djomeni [1 ]
Abolo, Guy Martin [2 ]
机构
[1] Univ Douala, Fac Sci, Dept Sci Terre, Douala, Cameroon
[2] Natl Hydrocarbons Corp Republ Cameroon, Yaounde, Cameroon
来源
INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION | 2016年 / 4卷 / 01期
关键词
SOUTH-ATLANTIC OCEAN; CONTINENTAL MARGINS; SEISMIC DATA; RIO-MUNI; SHELF; ENVIRONMENTS; TRAJECTORIES; EXPLORATION; INSIGHTS; GEOLOGY;
D O I
10.1190/INT-2015-0073.1
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Using 2D seismic data and well logs from the Kribi-Campo subbasin in the south Cameroon margin, we have analyzed the postrift succession with the aim of deriving a chronostratigraphic chart and identifying stratigraphic traps. The Kribi-Campo subbasin related to the rifting between Africa and South America could be divided into a structurally complex eastern depocenter and a relatively less disturbed western depocenter in which a break-up unconformity approximately 107.5 Ma underlined the beginning of postrift history. We have used the modern concepts of sequence stratigraphy to identify and characterize seven second-order (SS1, SS2, SS3, SS4, SS5, SS6, and SS7) sequences and one third-order (SS8) sequences grouped into three megasequences (A, B, and C) from Albian to Recent. Sequence 1 (Albian-Cenomanian) was characterized by a retrogradation overlying a lowstand progradational pattern. The SS2 (Campanian-Maastrichtian) and SS3 (Maastrichtian) sequences were deposited during a highstand normal regression. From Paleocene to Eocene, the deposition of sequences SS4-SS5 was controlled by the development of submarine fan turbiditic system related to a forced regression of coastline. From the Middle Miocene to Recent age, the SS6, SS7, and SS8 sequences have been characterized by the development of sigmoidal-oblique clinoforms of a deltaic system well observed in the northern part of the study area. We have studied a new undocumented phase of forced regression of Mio-Pliocene in age within the postrift sequence SS7. The forced regression phases are associated with the Paleogene and Neogene uplift. Relative sea-level curves were constructed and compared with the existing published curves. The processes involved in the formation of these sequences were interpreted as a combination of tectonics, sediment supply, and sea-level changes. Potential reservoirs embedded within the sequences include channel fill, shingled turbidites, slope fan, and basin-floor fan complex.
引用
收藏
页码:T79 / T101
页数:23
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