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137 South Road Thebarton South Australia Australia 5031 |
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| T | +61 8 8234 0511 |
| info@archimedes-consulting.com.au | |
Archimedes' successful exploration techniques for mapping Pseudo-Seismic Horizons from magnetic data in sedimentary basins were featured in a previous edition of GEO ExPro Magazine in an article titled "Magnetics and Fractures in Coal and Shale"
Unique System of Analysis
The acquisition of modern high-resolution airborne magnetic, gravity and gradiometer data has revolutionized the use of potential methods in oil and gas exploration as well as enhancing their uses in minerals exploration. The combination of more sensitive equipment, multi-component sensors, closer flight lines, lower altitude and digital data acquisition means that the amount of data acquired has multiplied by orders of magnitude. Within these data sets there is significantly more information which must be extracted to achieve full value from the survey. It is imperative that new approaches to processing and interpretation be applied to match new acquisition techniques.
Working with the client, Archimedes Consulting can add significant value to the results of high- resolution magnetic, gravity and gradiometry surveys for petroleum and mineral exploration. As well as the standard processes of reduction to the pole, Bouguer correction, depth to crystalline basement, etc we apply new methods and techniques to the interpretation of the data. The techniques used involve two principal methods:
Energy Spectral Analysis (ESA)
ESA with related filtering and required transformations, is applied to magnetic or gravity grid data. The application of ESA involves using a moving window (ESA-MW) technique, combined with a Multi-Window Technique (ESA-MWT) to detect horizons.
Click here for more detailed information about ESA.
Automatic Curve Matching (ACM)
ACM is applied to the original magnetic flight-line data and profile data extracted from a grid in east-west, north-south, northwest and northeast directions. The method works by identifying a magnetic anomaly on a profile and comparing the observed anomaly with one that is computed for a theoretical prism, thin plate or edge model, varying the parameters and accepting the model which provides the best fit.
Click here for more detailed information about ACM.