Well I admit I have learned a lot today...and abiotic oil seems less and less likely.
The article is fascinating really...says the hole went over 800 meters horizontally off of vertical!
.....and found sedimentary rock at the bottom.
1.2 inches of compressed sedimentation every 1,000 years x 400 million years. The whole world doesn't get that type of accumulation, but what do you think is happening in the ocean outside the Mississippi, Nile and Amazon River?
If you ever want to really learn some of the basics in the geology side of it, I recommend:
Nontechnical Guide to Petroleum Geology, Exploration, Drilling & Production, 3rd Ed.: 3rd Edition
Cheapest I found is $57 @:
http://www.barnesandnoble.com/listing/2691735085691?r=1&cm_mmc=GooglePLA-_-TextBook_NotInStock_75Up-_-Q000000633-_-2691735085691
It also gives a good over view past the geology and through to the production.
If you learn a bit about how a petroleum trap works and is formed, and particularly multiple layers with sealing rock above each layer, and different grades of oil at each layer, abiotic gets less and less feasible.