Gravity based tools have long been used in the exploration process, and generally utilize mass-density or field-strength based measurements. The SFD® airborne survey technology also utilizes gravity as a medium, but in a unique manner through exploiting wave attributes of the acquired signal to rapidly identify and rank prospect leads for oil and gas exploration.
The earth’s gravitational field is influenced by many sources, and has a complex three-dimensional shape, resulting in part from the inherent anisotropy within the crust. The basic operating premise of SFD® is that it responds to subtle variations or perturbations in earth’s gravity field, and these can be indicative of anomalies which arise from subsurface changes relating to geologic features of interest, such as faults, fault blocks, anticlines, carbonate bank edges, channel systems, over-pressure of fluids, etc. This family of geologic features are commonly correlated with the potential for occurrence of hydrocarbon trapping conditions. In essence, changes in subsurface homogeneity are the fundamental factor of the physical contrast to which SFD® responds.