Core data is a plug that is taken at a certain depth within a well. Core data indicates the lithology at that given depth in addition to the porosity and permeability.
Well Log Data
Well log data gives insights into the petrophysical properties of the rock. This data is gathered through wire logging tools and provides information such as lithology, porosity, water saturation, zone thickness and permeability.
This is usually done by interpreting seismic data and establishing the various structural features within the reservoir. If no seismic data is available, geoscientists will estimate these features through literature and previously published geologic maps.
The stratigraphic interpretation provides layering information within the reservoir. It also shows lateral continuity and the thickness of each layer. This is useful for determining how long an oil column extends both vertically and laterally.
Porosity and Permeability
Permeability is the hardest to define because it is directional. The most common way to assess vertical and horizontal permeability is by using two wireline formation testing modes. Porosity is also gathered through wireline testing. These two attributes are essential for developing a reservoir model because they provide key insights as to how fluids migrate and where they are stored.
Well Tests and Production Data
Well tests and production data can be gathered by performing tests before or after the well is completed. Production data is useful for modeling because it indicates the productivity of a well and its reservoir.
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