'petrengr1' pid='12685' datel Wrote:
If we look at the transcript
http://seekingalpha.com/article/1010821-...ipt?page=5 where Dave Holland is talking I think he may have given us a hint that we did not pick up. He said on pages 3 & 4 “ The formation being drilled consists of approximately 70-80% clay stone, 5-10% [unintelligible] stone, and 10-15% sandstone, with a trace to 5% coal penetrating from 1,532 meters to 1,535 meters. This occurrence of coal is higher than prognosis based on the Antelope-1 offset well. At 1,535 meters, the [calcimetry] measurements were at possibly 6.9% calcium carbonate, or limestone, and 1.75% magnesium carbonate with dolomite. However, at 1,540 meters [unintelligible], the calcimetry increased to approximately 20% limestone and 70% dolomite. As such, we are currently drilling ahead at a controlled rate toward the top of the reservoir and circulating bottoms up at approximately 2-meter intervals.”
They are drilling ahead very carefully in case this formation (which is 20% limestone and 70% dolomite) is the top of the reservoir. If this is the top of the reservoir they have hit it 150 meters (492 feet) higher than expected. If they get a large increase in gas or a gas kick they will probably set casing near this depth 1,540 -1,560 meter level. If the top of the reservoir is truly that high, the mud weight will have to be higher that anticipated in order to control the pressure. We will have to hope they do not experience a loss of circulation before getting the casing set. If they get into trouble they may have to set a cement plug at the top of the reservoir in order to safely run the casing.
If this turns out to be the top of the reservoir the gas column will be about 500 feet thicker than we had previously expected. With a derrick floor elevation of 99.7 meters above sea level and a gas water contact at -2,228 meters sub sea, the gas column would be 768 meters or 2,519 feet thick.
Otherwise the formation could turn back to claystone as we drill ahead and we might proceed to drill to the top of the reservoir as per the original prognosis.
.Pet 1 - In your post of 11-16-12 @ 12:08 pm you refer to the top of the reservoir for A3 @ 1532-35 meters. Have you looked closely on Pagr 24 at the Tuna map ? If yhat slide is oriented with north at the top, what do you think about the western potential size or extension of the Tuna prospect ? More seismics in that area should certainly create a lot of "buzz " about Tuna's possibilities , no ?? TIA for your thoughts .
