| P number: | P526436 |
|---|---|
| Caption: | Photomicrograph of sandstone from Deepdale, Barnard Castle, County Durham, England |
| Description: | The image is a photomicrograph of part of a thin section of sandstone viewed using a relatively high-power lens in order to examine the detailed mineral composition and pore structure of the rock. The specimen is of Carboniferous age. British Geological Survey Petrology Collection sample number MC 4754. The sample is composed of quartz grains of variable size which in tight contact indicating that the sandstone has undergone considerable compaction. The areas of blue resin highlight the presence of porosity in the rock. The large area of paler blue represents a feldspar grain that has been partially dissolved. Dissolution of framework grains in sandstones is a relatively common phenomena caused by the presence of corrosive pore fluids. They can result in the 'opening up' of the pore space, a feature termed 'secondary porosity'. The presence of secondary porosity can be very important in oil-bearing sandstones as it can allow the rock to be a good reservoir rock through which the oil can easily flow. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 269.66 KB; 1000 x 667 pixels; 85 x 56 mm (print at 300 DPI); 265 x 176 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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