What is 3D The following pages provide an explanation of Bell Geospace's three-dimensional Full Tensor Gradient technology, how the data is measured, and its uses. The 3-D FTG acquisition system was first developed for the U.S. Navy's Trident submarine program. The technology has recently been declassified by the military and is being applied to the oil and gas industry by Bell Geospace. Gradient data can be directly related to geologic structures. FTG technology provides an independent means to resolve subsurface structure by defining the size, shape and thickness of salt and subsalt structure.
Models indicate that gradient data also responds strongly to the presence of basalt.
The size, shape and thickness of basalt can be mapped and its signature removed from the measured data in order to image the sub-basalt structure. The 3-D FTG system accurately measures extremely small changes in density of any mass in all directions at prospect level resolution. Both the gravitational field and its gradient can be directly related to geological structures and anomalous densities such as subsalt. Five independent tensor measurements are taken as a routine part of the gradient data gathering process. These 5 independent tensors offer both qualifiable and quantifiable physical data, constraining your seismic data.