1 Coring Recovering rock samples for: Delineate rock strata types and composition –Clays –Cementation –Grain relationships –Mineralogy Identify sedimentary structures and texture Identify deposition environments to aid mapping, and predict reservoir geometry and likely areal extent Determine porosity and permeability Identify presence of reservoir fluids

2 Rotary core barrel

3 Coring bits are commonly 1.75 to 5.25 inches in diameter

4 Diamond insets on rotary coring bit. The insets may also be tungsten carbide or PDC

5 top bottom top

6 Percussion Sidewall Coring gun

7 Sidetrack coring system

8 Rotary sidewall tool

9 Coring protocols

10 Core #3880 and # 388 Assignment February Final core description should be typed with two columns: Core depth, and Description (as indicated below). 1.Describe both cores using the standard protocols: ● rock type ● color ● texture ● fossils/trace fossils ● sedimentary structures ● porosity (estimate it) ● oil shows 2.Identify the principal depositional environment (s) of the cored interval in both cores. Do this by identifying the principal facies i.e. - the distinctive rock types that broadly correspond to a certain environment or mode or origin (channel facies, marine bar facies, tidal facies, open marine facies, turbidite facies, etc). 3.Interpret the most likely areal distribution pattern of each reservoir facies in both cores. Use terms like areally extensive, blanket-like, narrow, elongate, lobate, etc.