OR/14/048 Results of petrographical analyses - Revision history

Dbk: /* Carbonation with gaseous CO2 */

2016-02-04T17:03:22Z

Carbonation with gaseous CO2

← Older revision		Revision as of 18:03, 4 February 2016
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	<li style="display: inline-block;"> [[File:14048plate14.jpg\|thumb\|center\|360px\| '''Plate 14''' BSEM photomicrograph of the interface between the intensely-carbonated cement (top and left of image) and residual relatively unaltered core (bottom and right of image) of the reacted cement plug from the ‘YNFP + gaseous CO<sub>2</sub>’, 40 days at 40°C under 40 bar pressure experiment. The carbonated cement zone displays a ‘chicken-wire’ alteration fabric of anastomising interconnected microfractures and shrinkage cracks sealed by microcrystalline calcium carbonate. Entrained air bubbles are mineralised by coarsely crystalline aragonite in the carbonated cement and by plates of portlandite in the unaltered cement.]] </li>		<li style="display: inline-block;"> [[File:14048plate14.jpg\|thumb\|center\|360px\| '''Plate 14''' BSEM photomicrograph of the interface between the intensely-carbonated cement (top and left of image) and residual relatively unaltered core (bottom and right of image) of the reacted cement plug from the ‘YNFP + gaseous CO<sub>2</sub>’, 40 days at 40°C under 40 bar pressure experiment. The carbonated cement zone displays a ‘chicken-wire’ alteration fabric of anastomising interconnected microfractures and shrinkage cracks sealed by microcrystalline calcium carbonate. Entrained air bubbles are mineralised by coarsely crystalline aragonite in the carbonated cement and by plates of portlandite in the unaltered cement.]] </li>
	<li style="display: inline-block;"> [[File:~~OR14048plate15~~.jpg\|thumb\|center\|450px\| '''Plate 15''' BSEM photomicrograph of the carbonated cement zone showing the ‘chicken- wire’ alteration fabric of anastomising interconnected microfractures and shrinkage cracks sealed by microcrystalline calcium carbonate (white), within a very fine matrix of microcrystalline calcite disseminated in a amorphous silica groundmass. ‘YNFP + gaseous CO<sub>2</sub>’, 40 days at 40°C under 40 bar pressure experiment.]] </li>		<li style="display: inline-block;"> [[File:14048plate15.jpg\|thumb\|center\|450px\| '''Plate 15''' BSEM photomicrograph of the carbonated cement zone showing the ‘chicken- wire’ alteration fabric of anastomising interconnected microfractures and shrinkage cracks sealed by microcrystalline calcium carbonate (white), within a very fine matrix of microcrystalline calcite disseminated in a amorphous silica groundmass. ‘YNFP + gaseous CO<sub>2</sub>’, 40 days at 40°C under 40 bar pressure experiment.]] </li>
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Dbk: /* Surface alteration characteristics of the cement cores */

2016-02-04T17:02:55Z

Surface alteration characteristics of the cement cores

← Older revision		Revision as of 18:02, 4 February 2016
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	All of the reacted cement cores exhibited extensive precipitation of secondary calcium carbonate reaction products on their external surfaces. The morphology of the carbonate varied considerably, from: dense crystalline calcite and aragonite encrustations with dry supercritical CO<sub>2</sub> (e.g. Plate 7), with supercritical CO<sub>2</sub> and YNFP (e.g. Plate 8), and supercritical CO<sub>2</sub> and ENFG; to encrustations of loosely-adhering microcrystalline sub-rounded rhombohedral calcite and rare coarse calcite rhombs after reaction with supercritical CO<sub>2</sub> and ENFG (e.g. Plate 9); to microporous bladed orthorhombic crystal aggregates of probable aragonite with dry liquid CO<sub>2</sub> (e.g. Plate 10); and fine tightly interlocking ‘scaley’ microcrystalline calcite and gelatinous (possibly amorphous) calcium carbonate seen with liquid CO<sub>2</sub> and ENFG (e.g. Plate 11).		All of the reacted cement cores exhibited extensive precipitation of secondary calcium carbonate reaction products on their external surfaces. The morphology of the carbonate varied considerably, from: dense crystalline calcite and aragonite encrustations with dry supercritical CO<sub>2</sub> (e.g. Plate 7), with supercritical CO<sub>2</sub> and YNFP (e.g. Plate 8), and supercritical CO<sub>2</sub> and ENFG; to encrustations of loosely-adhering microcrystalline sub-rounded rhombohedral calcite and rare coarse calcite rhombs after reaction with supercritical CO<sub>2</sub> and ENFG (e.g. Plate 9); to microporous bladed orthorhombic crystal aggregates of probable aragonite with dry liquid CO<sub>2</sub> (e.g. Plate 10); and fine tightly interlocking ‘scaley’ microcrystalline calcite and gelatinous (possibly amorphous) calcium carbonate seen with liquid CO<sub>2</sub> and ENFG (e.g. Plate 11).

	[[Image:~~OR14048plate6~~.jpg\|thumb\|center\|500px\| '''Plate 6''' Examples of cement cores before reaction (upper left hand image) and after reaction. Note the grey to brown colour change upon reaction with CO<sub>2</sub>, and the appearance of small calcium carbonate crystals on the surface of the cement. ]]		[[Image:14048plate6.jpg\|thumb\|center\|500px\| '''Plate 6''' Examples of cement cores before reaction (upper left hand image) and after reaction. Note the grey to brown colour change upon reaction with CO<sub>2</sub>, and the appearance of small calcium carbonate crystals on the surface of the cement. ]]

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Dbk at 17:02, 4 February 2016

2016-02-04T17:02:16Z

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Dbk: Protected "OR/14/048 Results of petrographical analyses" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite)) [cascading]

2016-02-04T16:23:01Z

Protected "OR/14/048 Results of petrographical analyses" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite)) [cascading]

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2016-02-04T16:18:16Z

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Ajhil: /* Carbonation with liquid CO2 */

2016-02-04T12:28:45Z

Carbonation with liquid CO2

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