Rock Cuttings from the Hibernia Field
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Transcript of Rock Cuttings from the Hibernia Field
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Rock “cuttings” samplesHibernia Field
Offshore East Coast Canada
Examples provided by Glenn Power, (geologist)
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This PowerPoint Presentation is intended for ‘non-technical’ persons.
The contents were initially generated (circa 1998) to share with co-workers on the Hibernia Platform (from kitchen staff to the ‘rig bosses’) who were frequently curious about ‘what we were drilling into’.
I took pictures of the “drill cuttings” and posted them in public places on the Hibernia Platform so that all could share in what even I as a geologist found to be ‘awesome’.
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At that time, I also took pictures of the microscopic fossils that I encountered in the drill “cuttings”. I have assembled another PowerPoint Presentation that has those photos.
http://www.slideshare.net/GlennPower/fossilsoffshorehibernia
Additionally, there is another PowerPoint Presentation that helps to explain how oil is formed, how we look for it, and how we get it out of the ground.
http://www.slideshare.net/GlennPower/oil-patch-broad-overview-for-non-technicals
I am happy to share these with the public so that we can all appreciate what we frequently take for granted. Oil and Gas.
Glenn Power, (geologist)
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Sandstone, light grey to tan (where oil-stained), fine to very fine grained with occasional medium grains, ‘sugary’ texture. Upper Hibernia Formation.(20X Magnification)
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Sandstone, light grey, fine to very fine grained with occasional medium grains, ‘sugary’ texture. Trace bitumen, trace oil staining.Upper Hibernia Formation. (20X Magnification)
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Sandstone, light grey to tan where heavily oil-stained, fine grained with occasional medium grains, ‘sugary’ texture. Trace bitumen and coaly laminations (black layers), Middle Hibernia Formation. (20X Magnification)
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Sandstone, light grey to tan where heavily oil-stained, fine grained with occasional medium grains, ‘sugary’ texture. Trace bitumen and coaly laminations (black layers), Middle Hibernia Formation. (40X Magnification)
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Sandstone, medium to dark grey, trace pyrite, very fine grained to fine grained, non-parallel ‘banding’ (possible indications of post depositional movement during compaction). Trace bitumen and coaly laminations (black layers), Lower Hibernia Formation. (40X Magnification)
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Sandstone, translucent to light grey to tan, microcrystalline to very fine grained with occasional medium grains, very hard, pervasive silica cement, tight.Catalina Formation. (40X Magnification)
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Sandstone, translucent to light grey to white, poorly sorted, very fine grained to medium with occasional coarse grains. Coarse grains are highly rounded and polished (possibly aeolian, wind-blown) calcareous cement, tight, friable to hard. Catalina Formation. (40X Magnification)
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Sandstone, translucent to light grey to off-white, microcrystalline in part to medium grained with occasional coarse grains, very hard, pervasive silica cement, tight. Catalina Formation. (40X Magnification)
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Sandstone, translucent to light grey to white, microcrystalline to very fine grained with occasional medium grains of chert, cuttings are angular to sub-angular from impact with the drill bit. Very hard, pervasive silica cement, tight. (10X Magnification)
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Limestone, light grey to dark tan, crypto-crystalline, dolomitic, angular fragments, hard. (10X Magnification)
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Limestone shell fragments, laminated, well rounded. (10X Magnification)
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Limestone, mottled, angular, hard. (10X Magnification)
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Limestone, mottled, angular, hard. (10X Magnification)
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Limestone, mottled, marly, soft. Petrel Formation. (10X Magnification)
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Limestone, reddish, microcrystalline, angular, hard. (10X Magnification)
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Limestone, light grey to white, silty and sandy, soft. (10X Magnification)
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Siltstone, grey to dark grey with tints of green and pink, firm to soft, moderate swelling, moderately calcareous. (20X Magnification)
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Shale, medium to dark grey, waxy lustre, wetted (40X Magnification)
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Shale, grey green, light grey to grey with pinkish streaks, trace silty, firm to soft, slightly swelling, wetted. (20X Magnification)
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Shale, dark grey with predominant pinkish streaks, firm to hard, waxy lustre, Medial Shale of the Hibernia Formation. (20X Magnification)
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Shale, medium to light grey, firm to hard, trace to moderate calcareous cement. (20X Magnification)
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Shale, medium to dark grey, firm to hard, trace calcareous cement, trace thin, white, crypto-crystalline limestone, non-swelling, wetted . (20X Magnification)
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Shale, dark grey, hard, NOTE, elongate shape of cuttings (splintery) is possibly indicative of over-pressuring of the shale beds. (40X Magnification)
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Shale, dark grey, trace brownish, hard, NOTE, elongate shape of cuttings (splintery) is possibly indicative of over-pressuring of the shale beds.Non-swelling, wetted. (40X Magnification)
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Shale, dark grey associated with abundant siliceous flakes, very thin and brittle, possible slickensides associated with encountering a fault plane.(20X Magnification)
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Siliceous flakes, very thin and brittle, possible slickensides associated with encountering a fault plane. (40X Magnification)
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Limestone, light grey to tan, with Glauconitic inclusions, firm . (10X Magnification)
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Limestone, light grey to white, with Glauconitic inclusions, firm.(20X Magnification)
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Limestone, with Glauconitic inclusions, firm . (20X Magnification)
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Sandstone, very coarse grained to pebbly with limestone matrix, friable. (10X Magnification)
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Limestone, with sand and quartz pebbles, firm to soft . (40X Magnification)
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Limestone, with sand and quartz pebbles, firm to hard, wetted .(20X Magnification)
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Limestone, white, with well rounded, highly polished, varicolored quartz pebbles, firm to hard. (10X Magnification)
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Limestone, white, with well rounded, highly polished, varicolored quartz pebbles, firm to hard. (40X Magnification)
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Limestone, white, with well rounded, highly polished, varicolored quartz pebbles, firm to hard. (40X Magnification)
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Quartz pebbles, well rounded, highly polished, varicolored, likely aeolian (wind blown) contained as inclusions in Limestone (previous slides). (20X Magnification)
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Quartz pebbles, well rounded, highly polished, varicolored. The angular edges of this grain are a result of the grain being fractured by the bit.(40X Magnification)
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Quartz and chert pebbles, well rounded, highly polished, varicolored, likely aeolian (wind blown) contained as inclusions in Limestone (previous slides). (40X Magnification)
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Quartz and chert pebbles, well rounded, highly polished, varicolored, likely aeolian (wind blown) contained as inclusions in Limestone (previous slides). (40X Magnification)
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Quartz and chert pebbles, well rounded, highly polished, varicolored, likely aeolian (wind blown) contained as inclusions in Limestone (previous slides).(40X Magnification)
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Quartz pebbles, (chert) well rounded, highly polished, semi-spherical to spherical, occasionally elongate. (20X Magnification)
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Quartz pebbles, white, well rounded, highly polished, spherical to sub-spherical, retrieved from predominantly soft, marly mudstone as likely wind-blown inclusions. (40X Magnification)
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Crystals of Aragonite, replacing limestone from shell fragments. (10X Magnification)
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Crystals of Aragonite, replacing limestone from shell fragments.(40X Magnification)
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Quartz pebbles, white, well rounded, with pervasive pyrite as cement. (20X Magnification)
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A ‘coaly’ fragment contained in Siltstone and Shale. Pyrite has replaced some of the original material. (20X Magnification)
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A ‘coaly’ fragment contained in Siltstone and Shale. Pyrite has replaced some of the original material. (10X Magnification)
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Woody fragment, pervasively replaced by Pyrite. (40X Magnification)
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Woody fragments, occasionally coaly and pervasively replaced by Pyrite. (40X Magnification)