By using the cokriging technique you can incorporate indirect information into estimation tasks. Give an example of its use (and why to use it) in the context of reservoir modeling.

In the context of reservoir modeling, cokriging can be used when there is limited or even no access to direct geological data. Cokriging can take advantage of indirect measurement data, such as logs or seismic surveys, and consolidate it with direct data such as core samples to form a more comprehensive reservoir model. The cokriging technique will weight the relative importance of the individual sources of data, essentially allowing indirect information to be used as “proxy” data to help fill in gaps in the direct data and thereby create a more accurate model of the reservoir. This can be especially useful in areas where collecting direct data is either difficult, expensive or even impossible, such as deeper areas of a reservoir or offshore applications.