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A Falcon® Airborne Gravity Gradient (AGG) survey was flown to resolve basement features and architecture for coal and coal seam gas exploration for Fortescue Metals Group (FMGL) in New Zealand. Interpretation of an initial magnetic survey derived very little structural information due to a lack of magnetic contrast in the basement.
A number of broad intrasedimentary volcanic features were easily identified from the magnetic data as well as an area of shallow basement in the NE of the survey area. However, due to the lack of variation in magnetic susceptibility between various sedimentary units, and between the sediments and basement, detailed structural information was lacking resulting in a limited interpretation of basement architecture.
The Falcon® AGG survey was flown at the same line spacing and direction as the previous magnetic survey. Immediately apparent was the far superior level of detail visible in the gravity data due to a greater variation in density between the various sedimentary units, and between the sediments and basement.The structural interpretations derived from both the magnetic and Falcon® AGG data allowed normal, strike slip and inverted faults to be interpreted, however the Falcon® AGG data allowed for their mapping to a far greater level of detail which in turn allowed interpreters to derive additional information on the age and the kinematic (fault dip, degree of throw) relationship of the structures. Basement architecture can now be defined, including graben structures, and reactivated faults.
The FALCON AGG survey, provided a vast improvement in the level of structural detail of the basement architecture as well additional information on the age and the kinematic (fault dip, degree of throw) relationship of these structures.
A lack of contrast in magnetic susceptibility between sedimentary units, and between the sediments and basement within FMG’s area of interest, resulted in a magnetic structural interpretation that lacked sufficient detail to define the basement architecture. The Falcon® AGG survey, provided a vast improvement in the level of structural detail of the basement architecture as well additional information on the age and the kinematic (fault dip, degree of throw) relationship of these structures.
CGG would like to thank Fortescue Metals Group Ltd. for allowing the presentation of these results.
The strength of the Multi-Physics offering is the ability to map several unique rock properties and integrate these with multiple complementary data sources as dictated by the geological challenge.
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