Computer Science
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41..257d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 41, Issue 2, pp.257-260
Computer Science
13
Scientific paper
Results are reported of long-term pressure-solution experiments that were initiated by the late E.M. Duyvis. A sample consisting mainly of quartz sand was compacted under a load which was increased at a rate of 6.7 atm/day up to a maximum of 710 atm, during which a temperature of 340°C and a pore pressure of 160 atm were maintained. Thin sections cut from the compacted sample were compared with similar sections from natural quartz sands. The interior of the laboratory sample showed a distinct similarity with pressolved sand found in a Venezuelan Tertiary sandstone buried at 4000 m (Lake Maracaibo, Block III). At the edges of the laboratory sample we observed in some places amorphous silica instead of quartz overgrowth. The formation of this unstable mineral indicates that a high supersaturation must have existed in the pores. The inhibition of the quartz formation in these places is possibly due to the presence of iron contamination originating from the steel pressure cell. To investigate the influence of temperature on the compaction process, a series of experiments were carried out in which pure quartz samples were subjected to loading at lower temperatures than above, the load being increased at a rate of 7 atm/day up to a maximum of 500 atm. These experiments revealed that when samples have undergone some consolidation the presence of water is essential for continuation of the compaction process. The results of the compaction tests emphasize the importance of the pressure-solution process, which markedly influences both compaction rate and formation strength and thus the porosity of the formation.
de Boer R. B.
Duyvis E. M.
Nagtegaal J. C. P.
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