EVALUATION OF GAMMA-GAMMA WELL LOGGING DATA APPLIED TO IRON ORE EXPLORATION – VALE GEOPHYSICAL WELL LOGGING TEST FACILITY

Wanderson Roberto Pereira, Dionisio Uendro Carlos, Marco Antonio da Silva Braga and Henry Francisco Galbiatti

ABSTRACT

The present paper shows the results of density measurement tests determined by probing of gamma-gamma geophysical well logging, performed in two stages: one at VALE Geophysical Well Logging Test Facility (GWTF), and another in boreholes for iron ore exploration. The calibration range is composed by four blocks of known density, tower-shape set, crossed by a hole with the same specifications of geological boreholes. Each block has a different composition, and a clearly determined density, as of 1.5 g/cm3 , 2.5 g/cm3 , 3.5 g/cm3 and 4.5 g/cm3 . The tests recovered the expected values, since the used appliances presented a correspondence with the predicted density values as measured in actual geological boreholes.

Keywords: geophysical well logging, iron ore exploration, data evaluation.