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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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Isotopic analyses of 20 brine samples from two diapir-related oil fields and one growth-fault-related gas field in southern Louisiana lend support to a model proposed by A. L. Workman and J. S. Hanor that brines from the geopressure zone are mixing with hydropressured formation waters along the flanks of the Iberia salt dome and, within the limits of the sampling, suggest that this hydrodynamic process may be characteristic of the region. The ^dgr18O, ^dgrD and 87Sr/86Sr determinations suggest that formation fluids above 2,000 m depth have partly equilibrated with terrigenous clastic rocks. Fluids below 2,000 m appear to be mixed Oligocene and Miocene seawater and clay-mineral water or evolved hydrocarbon-bearing water. These fluid composi ions vary with depth due to mixing and possibly to temperature variations. Some samples may contain constituents derived from salt dissolution.
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