Any well drilled during exploration for oil and gas is called a wildcat well.Not every wildcat well is a success, this is as a result of limitations on the part of geoscientists and available data.
A core is a representation of the oil and gas reservoir.A reservoir is situated deep into the the earth crust, far away from human eyes.Of every method used to evaluate the reservoir rock to determine whether it contains oil and gas in commercial quantities like seismic surveys, well logging, and pressure and flow rate tests, coring is the only method that actually brings a portion of the reservoir to the surface for physical testing.Coring actually limits guess work as you can see and touch the reservoir rock.
This is done to determine if to continue investing in that field, which is the field development stage, or abandon the field and keep searching for oil and gas deposits in other fields. As much as possible keep the core clean and without contamination.Any contamination of the core will lead to errors in measurement of reservoir properties.
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