| Abstract: | Pore-fluid pressure (Pf) > Ph has been encountered at the bottom of 3 geothermal exploration wells that attained temperatures > 370??C (at Larderello, Italy, at Nesjavellir, Iceland, and at The Geysers, California). Chemical sealing by deposition of minerals in veins appears to have allowed the development of the high Pf encountered in the above wells. The upper limit for the magnitude of Pf that can be attained is controlled by either the onset of shear fracturing (where differential stress is relatively high) that reopens clogged veins, or the hydraulic opening of new or old fractures (at relatively low values of differential stress). -from Author |
| Genre: | Article |
| ProdID: | 70016628 |
| Citation Author: | Fournier, R. O. |
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| Citation End Page: | 958 |
| Citation Issue: | 5 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geophysical Research Letters |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | The transition from hydrostatic to greater than hydrostatic fluid pressure in presently active continental hydrothermal systems in crystalline rock; 1991; Article; Journal; Geophysical Research Letters; Fournier, R. O. |
| Citation Start Page: | 955 |
| Citation Volume: | 18 |
| Citation Year: | 1991 |
| Type: | citation/reference |
| Text: | The transition from hydrostatic to greater than hydrostatic fluid pressure in presently active continental hydrothermal systems in crystalline rock; 1991; Article; Journal; Geophysical Research Letters; Fournier, R. O. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 1991 00:00 -0600 |
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