I did a google image search for a world map of offshore oil. Surprisingly I found virtually nothing. I had to search country by country for such maps.
I noticed most if not all were located very near the country's shore, on the continental shelf. These are fairly shallow seafloors, not even going below 1 km deep.
I guess this is because, it's easiest to explore (and drill) in the shallow regions first. But what I want to know, is there good reason to believe the very deep ocean also has oilfields.
So here is my question: Given our current understanding of geological history, is it likely that the oceans have decent oilfields located underneath the very deep seafloor?
"Decent oilfield" would be something like 10+ million barrels of oil without more sulfur than a Heavy Grade of Crude.
We have good bathymetric data of most oceanfloor, e.g., the underwater mountain-range in the mid-Atlantic, and the superdeep trenches following the Mariana Islands. I'm hoping that just by looking at the shape, we can make a good prediction where oil is located.
My only hint is a few very deep regions in the Gulf of Mexico, like this field that's 2.7 km below the sea. I am not aware of any other deep offshore platforms. I noticed the Gulf of Mexico has a fairly...what's the word here...bubbly shape in the deep parts.