Coupling Relationship between Shelf-Edge Trajectories and Slope Morphology and Its Implications for Deep-Water Oil and G
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Coup pling Reelationship betw ween Shelf-Ed dge Trajjectoriees and Sloope Morrphologgy and Its I Impllication ns for Deep-Wa ater Oil and Gaas Explooration: A Casse Studyy from the Passsive Contiinental Margin M n, East Africa A Mengtian Gao G
1, 2
, Shaang Xu*1, 2, Haiteng H Zhu uo*3, Yuxuan n Wang1, 2, Sh haobo Wu1, 2
1. Key K Laboratoryy of Tectonics and a Petroleum Resources, R Minnistry of Educattion, Chinaa University of Geosciences, Wuhan W 430074, China 2. Schhool of Earth Reesources, Chinaa University off Geosciences, Wuhan W 430074, China 3. Key Labooratory of Oceaan and Marginaal Sea Geology,, South China Sea S Institute of O Oceanology, Chinesse Academy of Sciences, Guan ngzhou 510301,, China Meengtian Gao: htttps://orcid.org/0 0000-0001-98955-6606 AB BSTRACT: Booth the shelf-edge trajectoriees and slope morphology m aree indicative off deep-water seedimeentation, but previous p studiees are relatively independen nt from each otther in the twoo dimensions. An inttegrated investtigation can en nhance the und derstanding off deep-water seedimentary syystems and enrrich resservoir predicction methods. Based on thee bathymetry data and seism mic data publlished, this stu udy ideentified ten sloope areas at the t continentall margin of East Africa and d classified thee clinoforms into i thrree types: conccave-up, sigmooidal and plan nar. Combined d with the distrribution of maain modern riv vers in East Africa, nine n modern soource-to-sink systems s were id dentified and the t catchment area is positiv vely correlated with the t size of thee shelf-edge delta. It is found d that the slope morphology of East Africa a is cloosely related too the geologicaal setting, sedim ment supply an nd sediment trransport pathw way in submarrine canyon of passivve continental margin. When the sedimen nt supply is staable, the concaave-up slopes are doominated by th he river-associaated and shelff-incising cany yons and the siigmoidal slopees are determin ned byy the headless canyons. c There exists a stron ng coupling relationship betw ween the shelff-edge trajectorries an nd slope morp phology. In general, g concaave-up slopes correspond to t descending trend, flat and a low w-angle ascend ding trend sheelf-edge trajecctories and hig gh-quality reseervoirs developed on the ba asin flooor under the influence i of rivver-associated and shelf-incising canyons which w have briight prospects for oill and gas explooration. Additiionally, sigmoiidal slopes usu ually correspon nd to descendin ng trend, flat and a low w-angle ascend ding trend sheelf-edge trajecctories at times of relative sea-level fall an nd the reservo oirs moostly developed on the uppeer slope underr the influencee of headless canyons. c Moreeover, the plan nar sloopes correspon nd to high-anglle ascending trrend trajectories which are hardly h potentiaal for exploratiion. Th he coupling moodel built in th his study will provide p an insiight for oil and d gas exploratiion in deep-wa ater areas with limiteed data and low w exploration degr
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