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The AAPG/Datapages Combined Publications Database
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Kelly G. Hartshorn Peter W. Hartshorn Chevron International Limited (Bolivia) Santa Cruz, Bolivia
Abstract West of the Mandiyuti thrust in the western sub-Andean zone, ramp-flat-ramp fault-bend fold geometries are more predominant due to a stratigraphic change that yields an additional higher level detachment. This higher level detachment may allow more prospective Carboniferous section to be preserved in the footwall structures, which is a new untested play type in the sub-Andean zone. In general, many of the deep folds imaged on seismic data do not match the idealized geometry expected of a fault-bend fold. We suggest either fault-bend folding with breakthrough at the top of the ramp or fault-propagation folding with detachment breakthrough as possible mechanisms for the development of such folds. Geochemical analyses and modeling provide a means to assess the quality, distribution, and maturity of the primary source rock in the southern sub-Andean belt and the overall hydrocarbon potential of the area. The primary oil-generative area is in the central and eastern parts of the sub-Andean foothills where surface oil seeps are abundant and corridors of more oil-prone kerogen are found. Biomarker analyses and burial history modeling show that the primary source rock entered the peak oil window during thrusting in the sub-Andean belt. Variations in source rock facies and heat flow, combined with different burial depths of the source rock section, may explain the distribution of oil and gas/condensate in southern Bolivia. |
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