Geophysical data processing systems

A method of processing geophysical data including at least measured potential field data from a potential field survey of a surveyed region of the earth to provide a representation of the geology of said surveyed region, the method comprising:

• generating a first model of said geology using a focussed inversion;
• predicting full range potential field data using said generated first model;
• comparing said full range predicted data to said measured potential field data to provide full range residual data representing a difference between the predicted data and the measured data, and
• interpreting said full range residual data to provide a representation of said geology of said surveyed region.

A method of processing geophysical data including at least measured gravity gradiometer data from a potential field survey of a surveyed region of the earth to provide a representation of the underlying geology of said surveyed region, the method comprising:

• processing said gravity gradiometer data to generate a shallow earth model,
• removing data predicted by said shallow earth model from said measured gravity gradiometer data to leave residual data;
• processing said residual data to generate a model of sub-surface geology, and
• generating a representation of said underlying geology of said surveyed region using at least one of said first and second models.