Structure, Stratigraphy and Hydrocarbon Potential of the Colombian Caribbean Margin and Tsunamigenic Hazards in the Western Caribbean and the South China Sea

The Colombian Caribbean Margin extends for ~850 km, southwest to northeast, from the Panama to Venezuela. Along the margin, the subduction of the Caribbean plate has formed an accretionary prism defining the edge of the overriding South American plate. This dissertation focusses on the late Mesozoic to recent, tectonic, structural, and stratigraphic history of the deepwater portion of the region, with an emphasis on hydrocarbon exploration potential. I also characterize the submarine landslide related tsunami hazard of the western Caribbean region and for the South China Sea. In Chapter 2, I identify and map three giant (>1000’s km3), Plio-Pleistocene submarine landslides along the Colombian subduction margin. To understand the tsunamigenic hazards of a recurrence of such an event, I model a potential tsunami source derived from the over-steepened upper slopes of the present-day Magdalena Fan. The modeling indicates an analogous slope failure would result in a significant tsunami, impacting population centers throughout the western Caribbean. In Chapter 3, I apply the same methods as Chapter 2 to document the history of slope failures in the northern South China Sea. Numerical modeling provides constraints on the tsunamigenic potential of an incipient slope failure and the geohazard potential of large-scale mass wasting along this margin. In Chapter 4, I map a 450 km long segment of the South Caribbean Deformed Belt offshore the Guajira Peninsula. The mapping reveals the subducting Caribbean Plate dipping beneath the northwestern margin of South America, the internal character of The South Caribbean Deformed Belt, and prominent shale diapirs associated with leading thrust faults. Fringing the deformation front is a well-developed proto-thrust zone, where the flat-lying sediments atop the subducting Caribbean Plate are undergoing the first stages of subduction-related deformation. In Chapter 5, I build upon the results from Chapters 2 and 4 to interpret the structure and stratigraphy of the Colombian Basin. I delineate the main elements of a deepwater petroleum system that includes stratigraphic traps within the distal Miocene Magdalena fan section. 1D burial history models and 3D basin modeling indicate that the primary risk for the exploration potential of the area is the presence of a laterally extensive Upper Cretaceous source rock within this depocenter.

Name thesis:degree_name

Doctor of Philosophy

Level thesis:degree_level

Doctoral

Discipline thesis:degree_discipline

Geology

Grantor

University of Houston

Year dc:date.issued

2020

Author dc:creator

• Leslie, Stephen Clarke

Advisor dc:contributor.advisor

• Mann, Paul

Committee members dc:contributor.committeemember

• Murphy, Michael A.
• Wu, Jonny
• Erlich, Robert N.

• Colombia, Mass-Transport, Basin Modeling, Tsunami modeling

Statement dc:rights

• The author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. UH Libraries has secured permission to reproduce any and all previously published materials contained in the work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).

Language dc:language.iso

eng

Handle dc:identifier.uri

https://hdl.handle.net/10657/10262

OAI identifier oai:identifier

oai:uh-ir.tdl.org:10657/10262