Deep Gas in the Barbados Accretionary Prism: Sources, Migration, Detection: Final Report.

摘要

The project objectives are: (1) to detect the existence on Barbados of gas derived from underthrust or underplated sediments at the prism base (now at 20 to 25 km in depth); (2) to understand the conditions and processes of organic maturation within and below the accretionary prism and the evolution of migration plants and reservoirs for gas within this progressively deforming mass; (3) to consider further strategies and methodologies by which gases generated at deep and shallow depths may be discriminated; (4) to study processes of accretion and structure generated in an active intra-oceanic subduction zone (Lesser Antilles) with large influx of terrigenous sediments; and (5) to provide a modern analog for the structural and hydrocarbon evolution of ancient Cordilleran accretionary complexes that incorporate an abundance of terrigenous sediment. Contents of this report include: forearcs and hydrocarbons; forearcs in global context, Lesser Antilles forearc; geologic evolution of Barbados; organic and hydrocarbon contents; thermal; deformation and structures; fluid emission; applications to ancient US prisms; and conclusions. (ERA citation 13:048144)