Welcome to Petroleum Geology Forums

This is a free online community that aims to bring petroleum professionals and geologists together and share valuable knowledge. Registration is easy so become a member now for instant free access.
  • Petroleum Geologists can stay up to date with industry related topics and exchange ideas and concepts.
  • Upstream Oil and Gas Consultants get a chance to share their expertise and gain exposure to land future projects.
  • Geology students and graduates can join the discussion and get into contact with potential future employees.

  >> Register Now

Post new topic Reply to topic  [ 2 posts ] 
Area-depth method 

Area-depth method

Many (exploration) teams use the area-depth method to calculate volumes in subsurface traps. The roots of this method go back to when hydrocarbon exploration was mainly map based and 3D modeling on workstations was not very common.

Even though it may seem like an outdated method it is still a relatively easy and solid methodology to calculate volumes in the subsurface. It is also a useful tool to asses uncertainties in the Gross Rock volume (GRV) caused by different top structure maps (velocity effect mostly), different contacts and different reservoir thicknesses.

The concept is shown below:

Basically the contours of a depth map are used to calculate the area within the contour. This is done for each contour at a fine enough contour-interval to sample the structure. These areas are plotted against depth and the area under the graph up to the contact depth is the (approximated) volume in which hydrocarbons occur. This volume between the top structure and the contact is called the Gross Rock Volume (GRV).

To account for the reservoir thickness either a constant reservoir thickness can be applied by shifting the top structure Area-Depth relationship down with the reservoir thickness. If there is a varying thickness a different Area-Depth relationship for the top and base structures can be used.


The GRV is then multiplied by multiple factors to end up with the Hydrocarbons Initially in Place (HCIIP).

Author Message

Joined: Wed Jun 09, 2010 12:45 am
Posts: 30
Post Re: Area-depth method
Thanks for sharing!

Mon Nov 10, 2014 8:15 pm
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

Search for:
Jump to:  

Content on EPGeology.com is intended for personal use only and to supplement, not replace, professional judgment. EPGeology.com disclaims any and all liability for your use of its content. As most of our content is supplied by our users we can not check copyright, and stress that copyright remains at the original owner. If you suspect copyright infringement please use the contact form to report it.
Contact || © EPGeology.com. || Powered by phpBB Asteroid Mining