Conventional cores are most desirable because samples can be collected from specific intervals of interest determined by a combination of direct observation of physical characteristics (such as facies), measured properties (such as [[porosity]] and [[permeability]]), and wireline log responses. They are also better because sample damage tends to be minimal. Thin sections are commonly made from porosity-permeability plugs cut from conventional cores because petrographic observations can be compared directly to porosity and permeability measurements. | Conventional cores are most desirable because samples can be collected from specific intervals of interest determined by a combination of direct observation of physical characteristics (such as facies), measured properties (such as [[porosity]] and [[permeability]]), and wireline log responses. They are also better because sample damage tends to be minimal. Thin sections are commonly made from porosity-permeability plugs cut from conventional cores because petrographic observations can be compared directly to porosity and permeability measurements. |