Page 158 - Hydrocarbon Exploration and Production Second Edition
P. 158
Reservoir Description 145
Figure 6.33 Photograph of core (left ¼ normal light, right ¼ UV).
rock
core bullet
Figure 6.34 Sidewall sampling gun.
formation and a rock sample will be trapped inside the steel cylinder. By pulling the
tool upwards, wires connected to the gun pull the bullet and sample from the
borehole wall.
Sidewall samples are useful to obtain direct indications of hydrocarbons
(under UV light) and to differentiate between oil and gas. The technique is applied
