CORES

Cores are sections of the reservoir formation obtained during drilling. They are obtained using a special drill bit

TYPESRegular CoresSide Wall Cores

USESCores are used to obtain Static and dynamic rock and fluid properties of the reservoir

TYPES OF CORE ANALYSIS

ROUTINE CORE ANALYSIS – Used to determine the static reservoir rock and fluid properties [ Porosity, Saturation and Permeability]

SPECIAL CORE ANALYSYS – Used to determine the dynamic reservoir rock and fluid properties [Capillary Pressure, Relative Permeability, Wettability, Interfacial Tension]

LABORATORY OBSERVATIONS

REASONS FOR OUTSIDE COATINGo To preserve the fluid inside the core sample so that the sample remains representative of formation conditions.o To ensure that the unconsolidated core is kept intact to maintain the integrity of the core.

LABORATORY OBSERVATIONS

SMALL HOLES IN THE CORESThe holes in the core samples indicate the areas where 1” or 1.5” plugs (see Figure 2) have been taken from the cores for routine or special core analysis (SCAL). These plugs could be horizontal or vertical depending on the bedding plane direction along which they were taken.

LABORATORY OBSERVATIONS

Figure 2 – Core Plugs

LABORATORY OBSERVATIONS

FORMATION OF THE ROCKSThe cores were obtained from sandstone formation which is a sedimentary rock. Sedimentary rocks are formed by deposition of sediments from weathered rocks [igneous and metamorphic]. The sedimentary rock formation process is as follows:Weathering – Transportation – Deposition – Lithification/Cementation.

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