VelPAK calculates 1000+ structural scenarios around your best technical case depth conversion model, by varying parametric and spatial values within known constraints. You can then visualize the connectivity and depth uncertainty of your field, quantify your probability of closure, drill with confidence and better understand the economics of your prospect.
Depth conversion is generally responsible for the bulk of the depth uncertainty in the estimation of field reserves. The standard VelPAK depth conversion routines [and associated workflows] produce accurate velocity models very quickly, but it is important to derive an estimate of the uncertainty in the depth horizons of interest.
The Analyze tool enables the user to develop a reasonable estimate of depth uncertainty based on a large number of depth models derived from one or more depth conversion scheme and allows the user to identify the key parameters controlling the range of Gross Rock Volume.
An ‘absolute’ answer to the depth conversion problem is impossible; the looped depth conversion processes available in the workflow system will generate multiple depth conversion models. The Analyze Module then allows filtering and analysis of the results and gives confidence as to the likely range of uncertainty in the model, and the deterministic parameters which will yield credible P50 (most likely) and end-point (P10, P90) solutions.
The Spill Point is the structurally lowest point in a hydrocarbon trap that can retain hydrocarbons. Once a trap has been filled to its spill point, further storage or retention of hydrocarbons will not occur for lack of reservoir space within that trap. The hydrocarbons spill or leak out, and they continue to migrate until they are trapped elsewhere. If the structure is ‘filled to spill’ then the spill point and value will vary for each depth realization. VelPAK automatically calculates the spill point and calculates the Height Above surface accordingly.
The animation option of the Analyze module will capture snapshots as required so a ‘cartoon’ can be run to watch the range of reservoir size or any other displays of interest. All the parameters of each model are saved such that any particular realization can be re-created by calling up the model number as required.
Watch the short video on Multiple Realisations below.