RMS Tip of the Month - October 2016 2D Volumetrics PDF

Tip of the Month–October 2016 How to quickly calculate 2D volumetrics in RMS? Imagine the following scenario: You are in the process of pulling together data for generating a 3D model of parts of your field or for the entire field. You have sorted out all your well data and have managed to tie in s...

Tip of the Month–October 2016 How to quickly calculate 2D volumetrics in RMS? Imagine the following scenario: You are in the process of pulling together data for generating a 3D model of parts of your field or for the entire field. You have sorted out all your well data and have managed to tie in some or all your (depth) surfaces to your well markers and are heading out for lunch in 10 minutes. Then, your manager pops in with the following question: “I have a meeting at 2pm and need some preliminary volumes by then. What do we have regarding reservoir numbers in terms of bulk volume and/or pore volume? Can you please provide some by 1:30pm today so that I can include these into my presentation?”. What number(s) can you provide? Can you even provide any information regarding uncertainty? There are a few easy accessible ways of obtaining 2D volumes before a more or less detailed 3D model with all project required details are constructed. Such 2D volumes are based on the structural (depth) maps you have and can provide an overview over volumes and, to certain degrees, uncertainty in depth and/or contacts. You can, in some cases use 2D average property maps, such as porosity and water saturation as input, should these provide sufficient information. However, keep in mind that any presentation of these pore-volume/HCPV/STOOIP/GIIP numbers should be used with care, as they are based on averaged properties. Basically these are methods for doing this: 1. 2D volumes above a “cut” surface (contact or any other surface) 2. Bulk volume versus depth report(s) 3. 2D volumetrics 1. 2D volumes above a “cut” surface (contact or any other surface) Horizons  Any depth surface  Volumetrics… In this example, I choose TopC depth surface. Note the values for your cut and fill volume in the panel (highlighted in the red box here). Hint: if you choose to create these surfaces below, they can be found in clipboard: i. Cut surface ii. Fill surface iii. Terrain with cut iv. Terrain with fill 2. Bulk volume versus depth report(s) Horizons --> Tasks --> Bulk volume vs. depth report… Input can be either one horizon (Top surface) or two horizons (Top and Base surface). Volumes per user specified depth range and increment can be calculated within any (user) defined polygon. A most likely Hydrocarbon contact is specified. Additionally, you can add a Min and Max depth for capturing contact variability. Optionally you can model surface uncertainty for the surfaces you have specified (one or two surfaces). One surface Model uncertainty Top – Base reservoir Model uncertainty For reporting, there are various settings to be specified. Most convenient is that this work step (job) automatically generates a pre-arranged report file that appears in the multiviewer when calculating. Hint: Toggle off the default setting “Overwrite current page” in order to keep any previous displays on your current multi-viewer page. Hint: output can also be delivered in Excel format. 3. 2D Volumetrics Horizons --> Tasks --> 2D volumetrics… 2D volumetrics can be calculated in similar ways to 3D volumetrics (similar panel set-up) where the use of volume boundaries and license boundaries can be specified, in addition to the use of property input. As it is based on 2D, you can specify an average number or an averaged property, such as a porosity 2D map which will be used as a constant between any layers specified. In Tabulated results  Volumetrics table viewer, the volumes can be found and viewed. Polygon sets I IM EL RY A N PR Hints:  Access to digitize Volume boundaries can be found directly from the panel  Your defined Import/export unit set guides the output format in the Volumetrics table viewer A 3D grid output can be generated; 1 layer per reservoir interval / zone with any specified 2D property maps being constant throughout the sub-reservoirs. Region Index (polygon areas) Porosity 2D maps mapped into the 3D grid Cross section of the porosity mapped into the 3D grid. Jobs and workflow: All these 2D volumetrics jobs can be set up in a workflow; however, only the last two jobs can run as proper jobs. With the aid of these methods explained, calculating preliminary 2D volumetrics for your field can be quickly calculated and the volumes, maps, and reports can be handed to your manager for his/her presentation in the meeting as stated in the scenario above.