LINK – http://youtu.be/zTrao_82dtI
The video Idahopicker did on his idea about the collapsed salt dome mentioned this paper –
Three generations of mud volcanoes on the Louisiana continental slope
So we found some more info –
Surface and Subsurface Manifestations of Gas Movement Through a N-S Transect of the Gulf of Mexico
Large volumes of gas have vented through a north-south transect of the offshore northern Gulf of Mexico. An overview of surface and subsurface manifestations of this gas venting is presented. This gas movement has caused extensive alteration of reservoired oils to the north of the transect which are estimated to have equilibrated with, or been gas washed by, as much as 30 volumes of gas for every volume of oil.
Some great graphics are here:
short link – http://wp.me/s2GNDM-volcano