This is a bit off the wall a bit but with the spectacular success in the pre-salt of offshore Brazil and the flurry of activity in the W. African coastal pre-salt, one wonders when industry will look seriously at a similar play in North Louisiana and South Arkansas.
The areas are geologically similar, only separated in time by about 100 million years or so. In the early Cretaceous the Atlantic began to open up, rift basins developed that were overlain by thick salt from periodic inflows and evaporation of seawater. This provided the perfect seal for the pre-salt structures and graben filling lake deposits.
Flash back to the Triassic when the Gulf of Mexico began opening, similar rift valleys opened, many were filled by the Eagle Mills formation. Later influx and evaporation of seawater created the overlying Louann salt which has been considered the "basement" for oil companies. There have been a handful of pre-salt penetrations over the years, the most intriguing being the Union Producing 1-Tensas Delta, 8-22N-4E, that in 1940 drilled through 1200' of Pennsylvanian marine shale below the salt.
Seismic data is problematic below the salt new processing techniques are beginning to overcome that. That said, it was clear on 80's - 90's vintage data that huge structures were present. One wonders if the big boys will ever take a new look?
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i was a gas buyer for the marketing affiliate of an interstate gas pl back then. at that time, i was working our tx and la gulf coast pipes on and offshore.
and, in those days, let's say '86, if you were pleasant to work with i'd pay you $1.25/MMBtu into our pl(s) and i'd pay you $1.20/MMBtu if you weren't.
no one liked those prices, least of all the affected (afflicted) producers. but, that's pretty much what the stuff was going for back then, regardless of how big of an outfit you worked for or the size of your gas package.
those were bad times.
There is a deep well in LaSalle Parish went to 24,220 ft. It was drilled in 1975-76,located in 35-10N-2E, ser.# 148493
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