Sicilian v b c4


I play the Sicillian all the time v. e4. About half my games are 3. bc4.  Most of the Sicillian videos and books I study give this move little attention.

 Is this a really good opening, or just something someone who does not know the openings plays?

Currently I am playing a game that resembles a closed Sicillian in that d3 was played by white instead of d4, but the white bishop sits on c4.  When I try to study up on closed sicillian there is little on this line. Therefore,  I assume it must be incorrect, but how to exploit it?