About This Item
- Full text of this item is not available.
- Abstract PDFAbstract PDF(no subscription required)
Share This Item
The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
ABSTRACT: Structural Mapping of the Vinton Salt Dome,
Louisiana, Using Gravity Gradiometry Data
Seismic
imaging of complex faulting and associated petroleum reservoirs adjacent to onshore salt domes in the Gulf Coast region is both
expensive and time consuming.
Modeling
studies show that gravity gradiometry data have the resolution to image such reservoirs where
seismic
is unavailable or cost averse. Full Tensor Gravity Gradiometry (FTG) data, which are higher resolution than conventional gravity
data, have been acquired by Bell Geospace over the Vinton salt dome located in southwest Louisiana. Overlays of interpreted faults and
a contour map of the areal extent of the salt on top of each component of the gravity gradient tensor show strong correlations useful for
mapping structural elements of the dome.
Interpretations of the Vinton salt dome are used to construct a detailed subsurface salt model. Forward models of the main counter regional fault and the caprock of the dome were built and used to compute the signal associated with those features to test their expression in the measured gradient data. Structural interpretation shows the main fault has a small expression in each of the gradients that is not easily discerned in the measured data. High density caprock exhibits strong signal on each component of the gradiometry data that can be used to map edges and locate the center of mass.