Mainland Resources, Inc.(fka MNLU)

[choctaw 02]

Is the "Brown Dense" layer of the Smackover what we are after in the Jasper County well?
Permalink Reply by Electro on July 3, 2010 at 11:30pm
The brown dense when found within the smackover is layered deeper within in the formation and will reflect a deeper depth than the 9,000 ft. to the smackover in some areas. The smackover formation can be very thick.

In the area of NW La. & SW Ark, the shallowest the smackover has been drilled & cored in Arkansas was around Snow Hill Arkansas and was at the depth of 4,500ft. The deepest the smackover in the area we are talking was around Lisbon LA and the depth cored there was 11,840ft. In the Fouke area the smackover was cored at approx. 9600 ft. Magnolia Ark was around 7,500 ft. In Haynesville it is around 10,020 to 10,800 ft. The brown dense within the smackover will vary accordingly.

Most geologist concur that a lot of the oil and gas found in the upper layers of the smackover actually may have migrated from the brown dense over millions of years where there was no capping of the non-porus oolitic lime. It is under this capping that could possibly be what is stirring interest now.

Saying this, it is easy to understand how the depths of brown dense can vary so widely in the geographic area that I mentioned above.

The smackover formation can have a shale base. It is from the Jurassic age. I have broken down the 3 major layers of the smackover below:

The upper layer is usually between 450 & 900 feet thick and is hard grey dolomite then a layer of brown very hard oolite lime of appros. 30ft.

The mid layer is usually between 120 & 200 ft of a softer brown oolitic lime that some consider the brown dense. There can be various white dolomite limes mingled in with this mid zone.

The lower layer is usually between 200 & 450 ft. and consists of gray - brown hard limes. These can grade into a grandular and chalky banded limestone and even into a harder shale.

Below the Smackover you will have the Louann Salt (Werner), Morehouse Shale and the Eagle Mills. In that order.
http://www.gohaynesvilleshale.com/group/arkansasshale/forum/topics/xto-alternate-unit-wells-1