It has been known for many years that entrapped hydrocarbons often coincide with shallow-sourced micromagnetic anomalies. Field studies have shown that these usually sub-nT amplitude anomalies are associated with near-surface magnetite deposits generated predominantly from microbial alteration of hematite to magnetite in the presence of hydrocarbon microseepage. These studies have demonstrated that hydrocarbon traps usually leak vertically as well as laterally. In the absence of significant cultural magnetic interference or shallow volcanic magnetic signature, and with favorable ground conditions, a high-resolution aeromagnetic survey can effectively locate seep-induced micromagnetic anomalies. One such survey has been recently performed over the Muglad Basin...

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