Hard to swallow!

Oil and natural gas exploration -- geology and geophysics
Post Reply
Mohamed

Hard to swallow!

Post by Mohamed »

I am taking a Seismic Petrophysics class, and my professor was explaining about reservoirs with around a 60% heavy oil and a 40% rock (the grains of that rock kind of do not touch each other). Does this geological setting exist in nature? Would the heavy oil be capable of holding the whole formation?
Last edited by Mohamed on Sat Mar 19, 2011 10:56 am, edited 3 times in total.

Mohamed

Re: Hard to swallow!

Post by Mohamed »

Given that the highest rock porosity ever recorded is ~ 35%. If this rock exists, it would have a 60% porosity !!! (i.e. void space is > matrix itself!!!).

Dave
Gold Member
Gold Member
Posts: 91
Joined: Thu Aug 27, 2009 5:35 pm

Re: Hard to swallow!

Post by Dave »

It is confusing. If the the grains of the rock do not touch each other, it's unconsolidated sediments, not a rock. Maybe the rock was loosely defined by your professor. The highest porosity ever reported is close to 50% in chalk formations. I can imagine that the grains of chalk formation can be very loosely touching each other, especially after the secondary porosity developed after the deposition. In this case, it's still kind of a chalk formation, with some skeletons holding the formation together in large scales and filled with loose grains in small scales.

Mohamed

Re: Hard to swallow!

Post by Mohamed »

I have no experience about the properties\ physics of heavy oil, but my professor said that heavy oil along with the grains suspended in it would be able somehow to hold the whole "thing" together (i.e. the combination acts as a rock). I will open the discussion with him again on Monday, and I will let you know how it goes.

** I may need to attach a graph\ picture, if anyone knows how (and you have the time), please let me know.

Thanks Dave!

Mohamed

Re: Hard to swallow!

Post by Mohamed »

Mohamed wrote: (the grains of that rock kind of do not touch each other)
Hey Dave, I may have added this sentence from my head. I am not sure whether he really said or not. Would this make a difference in your answer?

Geos
Gold Member
Gold Member
Posts: 55
Joined: Tue Aug 11, 2009 3:58 pm

Re: Hard to swallow!

Post by Geos »

Just copy it from one of my previous posts:
Here is how to post a image:
When you post or reply a message, below the text window, there is a tab "upload attachment", click it, and then use the button "browse" to locate the image file in your computer, click "add the file", the window will be refreshed. Under the text window, click "place inline" under the file name you just added. You'll see something like "[attachment..." in the text window. Now you have added the image to the post, the rest is like post the regular post. Submit the post and the image would appear.

marken
Silver Member
Silver Member
Posts: 43
Joined: Tue Jun 08, 2010 12:38 pm

Re: Hard to swallow!

Post by marken »

The viscosity of the some heavy crude oils is really high. Combined with the right environment to form something similar to bitumen/tar, the oil does not flow at all.

Dave
Gold Member
Gold Member
Posts: 91
Joined: Thu Aug 27, 2009 5:35 pm

Re: Hard to swallow!

Post by Dave »

marken wrote:The viscosity of the some heavy crude oils is really high. Combined with the right environment to form something similar to bitumen/tar, the oil does not flow at all.
This makes sense if it works the same way the tar does, but the porosity can be that high?
Mohamed wrote:I have no experience about the properties\ physics of heavy oil, but my professor said that heavy oil along with the grains suspended in it would be able somehow to hold the whole "thing" together (i.e. the combination acts as a rock). I will open the discussion with him again on Monday, and I will let you know how it goes.
Please let me know, I am also interested in what the professor is going to say. Thanks!

Mohamed

Re: Hard to swallow!

Post by Mohamed »

Dave wrote: Please let me know, I am also interested in what the professor is going to say. Thanks!
My professor said that this situation does exist in nature. They call it "Tar Sand", and it exists in some parts of the world like Alberta, Canada :oops:

Dave
Gold Member
Gold Member
Posts: 91
Joined: Thu Aug 27, 2009 5:35 pm

Re: Hard to swallow!

Post by Dave »

Mohamed wrote:My professor said that this situation does exist in nature. They call it "Tar Sand", and it exists in some parts of the world like Alberta, Canada :oops:
So it's not really a rock?

Mohamed

Re: Hard to swallow!

Post by Mohamed »

Nope! When you hold in your hands, it will fall apart as big chunks.

Dave
Gold Member
Gold Member
Posts: 91
Joined: Thu Aug 27, 2009 5:35 pm

Re: Hard to swallow!

Post by Dave »

Just find a good link with pictures for tar sands, they do look like rocks, maybe you can call them sedimentary rocks.
http://ostseis.anl.gov/guide/tarsands/index.cfm

Mohamed

Re: Hard to swallow!

Post by Mohamed »

Thanks for the link. This picture kind of matches what my Prof said.
Attachments
Tar Sand
Tar Sand
TarSands-600.jpg (80.34 KiB) Viewed 8640 times

Eegamizer
Silver Member
Silver Member
Posts: 12
Joined: Wed Aug 12, 2009 4:42 pm

Re: Hard to swallow!

Post by Eegamizer »

I never knew the oil can be mined instead of pumped from oil wells. It's a very interesting geological setting.

Post Reply