Print this pagePetroleum Systems Assessment Using Surface Geochemistry Technology in Guajira Basin, Offshore Colombia
Oil and gas seeps are of great significance to deep offshore petroleum exploration and especially in ultra deep frontier areas. The basic assumption for the use of oil and gas seeps in offshore petroleum prospecting is that hydrocarbons from deep sedimentary sequences can migrate, either directly from source rocks or from reservoirs, to the seafloor. Geochemical analysis of surface and near-surface sediments in a generative basin should therefore, detect a surface expression of the underlying hydrocarbons.
One hundred piston cores were collected in the Guajira Basin, Offshore Colombia. The analytical methodology used to identify hydrocarbon seeps included sample routine screening methods using microbiology (using analysis of ribosomal DNA (SARD)), total hydrocarbon analysis by gas chromatography (GC-FID), total scanning fluorescence (TSF), headspace and sorbed gas measurements. Selected samples were then analyzed by gas chromatography-mass spectrometry (GC-MS) for biomarker identification diamandoids and carbon isotopes of gases (C1-C5). Our experience shows that this methodology.
This work discusses geochemical and microbial data obtained from one hundred (100) piston cores samples collected in the Guajira Basin. The results of these analyses were compared to regionally-produced oils and fully integrated with regional geological data.
AAPG Search and Discover Article #90100©2009 AAPG International Conference and Exhibition 15-18 November 2009, Rio de Janeiro, Brazil