Fluid Contacts : Log or Pressure Gradients

Well Test Analysis, Pressure and Production Monitoring........ etc.

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soman703
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Fluid Contacts : Log or Pressure Gradients

Post by soman703 »

Fluid Contacts : Log or Pressure Gradients
Hello everyone,

I have a question please. What is the reliable method among log or pressure gradients for determining fluid contacts?

In Heterogeneous reservoir why do we trust contact obtained from pressure gradient compared to logs? How does this selecting contact change from heterogeneous to homogeneous & sandstone to carbonates?

In theory, log is a response of matrix while gradient is a response of fluid. And generally log gives us contact while gradient gives us free water or free oil level.


Can anyone shed light on this issue please?

Thanking you all,
Soman Ahmed
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FANARCO
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Re: Fluid Contacts : Log or Pressure Gradients

Post by FANARCO »

Generally speaking it is not so easy to take a pressure points in carbonate formation.

In sandstone (either homogeneous or heterogeneous) formation you can detect the oil water contact by intersecting oil and water gradients

From open hole logs you can construct Pc curve and hence calculate the FWL

Check this link for more info:

http://www.fanarco.net/bb3/viewtopic.php?f=6&t=1610
soman703
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Posts: 93
Joined: Sun Nov 29, 2015 10:34 am

Re: Fluid Contacts : Log or Pressure Gradients

Post by soman703 »

Thankyou so much Fanarco bro.

Very helpful and it cleared my doubts.

Best Regards,
Soman Ahmed
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