Originally Posted by
tenacious_dog
The Gray Sand is a formation below the Cotton Valley and tends to be pretty tight. A geologist would have to tell you if it is part of any formation family. Three or four years ago Anadarko drilled a series of wells in Jackson Parish targeting the Gray Sand. I followed it pretty closely. Several wells came in making 10+ mscfd, some over 15. Alot were 5+. Anadarko sold the field about a year ago to, I think, EXCO for something like $100 mil. The Gray Sand is a big part of the Terryville Field in western Lincoln Parish. It's been found in Claiborne and Webster.
Any of the geologist can jump in here. There are a variety of productive formations at various depths all over north Louisiana. Most are natural gas, some are oil. If memory serves, we used to go through the Haynesville Shale on the way to the Smackover. The Smackover wells were in northern Webster & Claiborne and all over southern Arkansas. The Cotton Valley runs like 9200 to maybe 10,500 depending on where you're drilling. It's shallower near the Ark/LA state line and trends deeper as you go south. Cotton Valley accounts for most of the wells drilled in north LA. The Rhodessa, Hosston, Nacatoch and lots of others run from just a few hundred feet to as deep as you want to go. But at this point, comparatively little drilling has been done below 12,000 and next to none below 15,000.