Both the light hydrocarbons (acid extraction analysis) and aromatics (fluorescence analysis) indicate the data are highly correlated and free of contamination.Fluorescence fingerprinting also matched a known producing horizon (mid-depth oil) to the sediment samples. This is further validated when integrated with fluorescence data. The 3D seismic data, in both vertical and horizontal displays, indicate a highly faulted area.Targeting cores over major faults is only necessary for collecting high concentrations of liquid petroleum. High-density, grid sample design programs give useful geochemical data with meaningful spatial detail.Shallow, 2 m piston-core samples can be obtained free of terrestrial contamination at lower costs than deeper coring operations.The integrated, synergistic results far exceed the information obtained with either data set by itself. Bottom cable, 3D seismic data, and shallow piston-core geochemical data are complementary.The following conclusions were made from the integration of 3D seismic survey and geochemical data: 16 are those identified in the 1,500 msec horizontal time slice in Fig. They appear associated with possible traps identified in the 3D seismic survey data near the productive horizon. Other high ethane concentrations are not located over visible surface fault traces. The vertical profile line shows that some ethane and three-ring aromatic concentrations are associated with visible faulting. 14 and 15 ) runs north-south, through the central portion of the study area. 16 compares a vertical profile line to both acid extraction analysis (ethane concentration) and fluorescence analysis (three-ring aromatic concentration). Therefore, ethane and other low-molecular-weight hydrocarbons appear to have migrated near-vertically where faults are not apparent in the seismic data.įig. Four areas (labeled 6 through 9) appear significant in highly productive Block 41 to the north. Five significant northeast-southwest trending seismic features parallel geochemical anomalies located between faults in Block 58 (labeled 1 through 5). Numerous ethane concentration anomalies appear associated with features other than faults. The 1,500 msec horizon was selected because it is closest in depth to the producing zone (mid-depth oil) matched using fluorescence fingerprinting. 15 compares the horizontal time slice at 1,500 msec to the ethane concentration data from acid extraction analysis. Fluorescence fingerprinting indicates liquid, petroleum seepage along the faults is very similar to mid-depth oil (Fig. The shallow, seismic time slice also validates several aromatic data trends in Fig. The seismic data show some of the conduits (macro-fractures) for liquid petroleum seepage into the near-surface sediments as faults. The correlation between the faults in the seismic data and aromatic anomalies is very good. 14 compares the horizontal time slice at 500 msec to the three-ring aromatic concentration data from fluorescence analysis. The purposes of integrating the seismic and geochemical data were to determine and validate subsurface structures and vertical migration pathways and locate potential hydrocarbon accumulations associated with geophysically defined traps. These seismic sections were compared to various geochemical concentration and composition maps. Numerous horizontal time slices and vertical profile lines were available from the 3D seismic data. The 15.5 sq mile study area is in 11-24 m (36-79 ft) of water (OGJ, Apr. The data discussed were acquired in mid-1992 in a bottom cable, 3D seismic and shallow piston-core geochemical survey on Main Pass Blocks 41 and 58 off Southeast Louisiana.
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