'petrengr1' pid='40229' datel Wrote:Is Antelope Deep connected (in pressure communication) with Antelope? To determine the answer to that we must depend on information provided by IOC. I will take you through how this has developed over the years. My conclusion is NOT based on any kind of scientific information but is based on my interpretation of the information that has been released by IOC and the terminology used by them.
Let’s start by looking at a few pictures going back as far as 2008 (IOC has taken down everything earlier than that). Even back then we were told that the structure “significantly broadens to the south” (probably should have said southeast). See http://tinyurl.com/klb4bqv Page 18
And now another one from 2008. Have a look at http://tinyurl.com/ks6rc4r page 15. What is that big purple blob to the southeast? Looks like a big sink hole. On the other hand maybe it is across a fault and it is an adjoining fault block with another high that is lower than the Antelope structure. Is that the beginning (northwest end) of Antelope Deep?
Now look at http://tinyurl.com/lldpu77 page 16 another one from 2008. Notice the broadening of the Antelope structure to the southeast. It is interesting to remember that the very best porosity in the Antelope wells has been at the very top of the zone where we have seen high porosity limestone and dolomite. If this is high porosity limestone and/or dolomite at the top of the zone broadening to the southeast we would not care too much if it was lower. The gas column would be thinner because it is closer to the gas/water contact but the thinner pay zone could be good porosity because it is at the top. Of course we need to remember that we are moving off the top of the reef so for than reason the porosity could be getting lower as we move away from the best part of the reef.
Another one from 2008. Look at that Mule Deer. http://tinyurl.com/q77gxv5 page 14
See http://tinyurl.com/ntr7ff8 page 8 Note north is the bottom of the map. Also see page 22.
From 2009 see the broadening to the southeast at: http://tinyurl.com/l5zz77g page 10
Now for a more up to date picture see http://tinyurl.com/ox8hsuh page 18. The purple, blue and red lines all appear to be faults. Note that only the most southeastern part of the map is labeled Antelope Deep. That is the part southeast of the last fault. The part north of that fault is labeled Antelope. Notice the location of the Antelope Deep portion relative to the boundary of PRL 15. There is another fault across the Antelope structure northwest of the “Antelope” Label. Keep that in mind for the next picture.
Here is a picture from the latest presentation: http://tinyurl.com/k7uzpj5 page 5. You will notice that on this picture a much larger area is labeled Antelope Deep (based on the distance from the PRL 15 boundary). Looks like they are bringing Antelope Deep up to the second fault on the previous map. This map does not show any faults but if you magnify it so you can see it well you will note that the tip of the yellow (Antelope Deep) portion overlaps the red (Antelope) portion. This means the tip of the Antelope Deep is below and under the tip of the Antelope block.
As I said, nothing scientific here. Just rolling with the punches as they change the pictures. It still looks like the Antelope Deep is a separate fault block from the Antelope block and it is lower than the Antelope block and the Antelope block gas/water contact. The only way it can be full of gas is if it is NOT in pressure communication with the Antelope block. That scenario results in the most gas but not the most money. Anyway, let’s look at the bright side, if it is successful we will have more gas.
They have obtained more seismic data recently that they have not yet shared with us. Maybe we will get another picture soon.
I hope that was not too boring!
Pet, your posts are never boring! I would much appreciate your thoughts about the trend map on page 10 of the most recent presentation. At first glance it appeared to me that the three trends corresponded to different periods of reefal deposition with trend 3 being the oldest and deepest. And it looked like Antelope Deep would be part of trend 2. Enlarging the map I see that the arrow at the end of trend 1 ends on AD. Is it the case that if AD is part of trend1, being reef deposited at the same time as Antelope, that AD is lower than Antelope because of downthrusting at the fault relative to Antelope? And if AD is part of trend 2, AD could extend to the north under Antelope for a substantial distance, ,making AD even huger than huge?
Thanks so much for your posts. They are highs on the board.