Ok, a little time to play after work - finally. 

Here is the render straight from Carrara: 

And, here is the render plus a little post work. While all of this can be done in Carrara, for me, it just makes more sense to leave some of the variables for post-production. (That's the business-side of my 3D head screaming, "Time is money!")

You can download the file here >  "Oil Rig and Ocean" (I've substituted the models in this image with some that I can distribute - the background .jpg is also out because it ballooned the file to 197M - hey, it was 20,000x10,000px, ok?) Edit 2015-13-17: Also, I just realized that I used Digital Carver's Guild Shader Ops which has an Invert function that I used on the Cellular items in the shader. If you don't have that the sea should still look ok but it will be different.