If the fireplace was rated for wood burning, you can reconvert it to wood if it has not been modified too much. You will need to have some one come out and evaluate it. My suggestion, though, would be to install a better insert. They make gas inserts with blowers, that circulate the air through tubes around the fire box. You can not see the tubes, because they are in the shell of the firebox, but they gather the heat produced by the gas burning and blow it into the room. After one season of using a log fireplace, you may not like the constant cleanup of ash, the staining of soot, and the annual chimney inspections. There are a myriad of reasons not to go with a wood fireplace, unless you want the nostalgia and the aroma of burning wood. But for heat production, the loss up the cimney sometimes does not out weigh the amount of heat produced. Most of the time unless you have a sealed firebox with a blower for air circulation (like the gas unit) you loose more air from the home than is produced.