Page 203 - Standard Handbook Petroleum Natural Gas Engineering VOLUME2
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172 Reservoir Engineering
Figure 5-99. Lithology estimation chart for the FDC-sonic log combination in
fresh water [199].
Theow. The EPT is a sidewall tool that measures the dielectric properties of a
formation by passing spherically propagated microwaves into the rock. The tool
consists of 2 transmitters (TI, and T2) and 2 receivers (Rl, and %) mounted in
an antenna pad assembly. Its basic configuration is that of a borehole com-
pensation array (much like the borehole compensated sonic (BHC) log). The
transmitter fires a 1.1 GHz electromagnetic wave into the rock around the well-
bore. As the wave passes through the rock and fluid there, it is attenuated, and
