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Trampas no convencionales asociadas con ofiolitas de la faja septentrional de hidrocarburos (La Habana-Matanzas, Cuba) [Non-conventional traps associated with ophiolites of the northern hydrocarbon belt (Havana-Matanzas, Cuba)]
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|Alternate Title:||Non-conventional traps associated with ophiolites of the northern hydrocarbon belt (Havana-Matanzas, Cuba)|
|Authors:||Rossello, Eduardo A.; García-Sánchez, Rolando|
|Author Affiliations:||Primary: |
Universidad de Buenos Aires, Buenos Aires, Argentina
Universidad Technológica de La Habana, Cuba
|Volume Title:||Boletín de Geología|
|Source:||Boletín de Geología, 39(3), p.41-54. Publisher: Universidad Industrial de Santander, Bucaramanga, Colombia. ISSN: 0120-0283|
|Note:||In Spanish with English summary. 42 refs.; illus., incl. sects., geol. sketch maps|
|Summary:||The geological characteristics of the Cuban territory are the result of a multi-episodic tectosedimentary history, represented by a series of sequences and structures closely related to the evolution of the Western Caribbean. Mafic and ultramafic rocks, mainly serpentinized peridotites, gabbros and basalts, are distributed throughout the northern margin of Cuba (∼200 km of exposure) and are mostly associated with ophiolitic complexes linked to the evolution of the Caribbean plate. The northern hydrocarbon belt comprises oceanic volcano-sedimentary sequences forming a stack of thrust sheets (ophiolites-Mesozoic sedimentary carbonates); such configuration is the responsible for the reservoir and seal conditions of the many hydrocarbon fields in the area. Oil accumulations occur mainly at depths around 500 to 800 m, locally up to 3,000 m, with oil-saturated thicknesses up to 400 m and 9° to 19° API. Reservoirs are mainly fractured serpentinites, with mean log porosity values of ∼6% (and up to 8% SWC) with permeabilities varying between 0.001 to 21.4 mD. Porous to dual porous-fractured reservoirs occur in other fields as tectonic slabs of cataclastic serpentinites, peridotites, gabbros and diabases, with porosities <3% (in log) and up to 9% (SWC) and permeabilities ranging between 0.001-290 mD (7,400 mD average). The highest porosities in the area are recorded in fractured and weathered peridotites and gabbros, with log-derived porosity values up to 11% (4% average) and sidewall core up to 8%. Good quality seals are locally formed by the weathering of serpentinites. New concepts in oil exploration involve the analysis of ophiolitic complexes and related rocks in the Pacific margin as potential promising targets. Thus, the resemblance of these Cuban ophiolitic complexes with their under-explored South American analogs opens a new opportunity for hydrocarbon exploration in the offshore of Colombia, Peru and Chile.|
|Subjects:||Basalts; Basins; Block structures; Faults; Hydrocarbons; Igneous rocks; Metasomatism; Offshore; Oil and gas fields; Ophiolite; Ophiolite complexes; Organic compounds; Outcrops; Peridotites; Petroleum; Petroleum exploration; Plutonic rocks; Porous materials; Reservoir properties; Reservoir rocks; Sealing; Sedimentary basins; Sequence stratigraphy; Serpentinization; Stratigraphic traps; Syntectonic processes; Systems; Traps; Ultramafics; Volcanic rocks; Antilles; Caribbean region; Cuba; Greater Antilles; Havana Cuba; La Habana Cuba; West Indies; Cuban fold belt; Matanzas Cuba|
|Coordinates:||N195000 N231500 W0740000 W0850000|
|Copyright Information:||GeoRef, Copyright 2019 American Geosciences Institute.|
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