Stratigraphic Framework and
Petroleum Systems of the
Ramirez,
Victor O.1 (1) University of Alabama and Ecopetrol - Colombia,
Tuscaloosa, Alabama,USA, AL
The
The stratigraphic
section recorded includes Jurassic and Cretaceous units with both petroleum
source and reservoir rock potential. The Tertiary interval, Eocene to Upper
Miocene, accounts for the majority of the stratigraphic
section in the basin, and the main reservoir intervals recognized are Oligocene
carbonates and siliciclastics, Lower Miocene
calcareous sandstones and Upper Miocene sandstones.
Hydrocarbon occurrences in wells and gas
production from fields, along with the interpretation of geophysical (mainly seismics), geological and geochemical information, have
resulted in the recognition of four petroleum systems in this basin:
Macarao – Siamana
P.S. (.) (Eocene-Oligocene in the northeastern part of the
basin); Tertiary – Jimol/Uitpa P.S. (.) (Lower Miocene reservoirs producing in the gas fields); Castilletes-Castilletes P.S. (?) (reservoir
potential in Upper Miocene deep water clastic
environments); and Mesozoic-Cretaceous P.S. (?) (reservoirs
as fractured Cretaceous limestones, with analogy from
Venezuelan Mara-La Paz fields).
Sequence stratigraphy
interpretation from the onshore and platform areas towards the deep offshore
areas provides the framework for modeling the petroleum systems in the
AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California