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Figure F9. Section photographs of drilling disturbances in cores. A. Mud drilling injection causing some lamination in semiconsolidated sandstone. B. Laminations of drilling mud in silty sandstone, which at a glance looks “natural” and may lead to false interpretation of sedimentary structure originally present in core samples. C. Laminations caused by mud injections. In this core, mud laminations present with some offset. It was quite hard to differentiate between natural and injection laminations. D. Fine laminations caused by mud injections which again look natural. E. “Nugget structure” in the core caused by injections of drilling mud.

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