Geofluids

Cover image for Vol. 13 Issue 3

August 2013

Volume 13, Issue 3

Pages i–i, 273–394

  1. Issue Information

    1. Top of page
    2. Issue Information
    3. Original Articles
    1. Issue Information (page i)

      Version of Record online: 23 JUL 2013 | DOI: 10.1111/gfl.12054

  2. Original Articles

    1. Top of page
    2. Issue Information
    3. Original Articles
    1. Breakthrough of contaminant plumes in saturated volcanic rock: implications from the Yucca Mountain site (pages 273–282)

      S. Kelkar, G. Srinivasan, B. A. Robinson, R. Roback, H. Viswanathan, K. Rehfeldt and P. Tucci

      Version of Record online: 18 APR 2013 | DOI: 10.1111/gfl.12035

      Thumbnail image of graphical abstract

      Contaminant plumes with significant lateral spreading indicating transverse dispersion have been reported in the literature from many sites. At the Yucca Mountain site modeling shows that changing the value of transverse dispersivity from 0.05 to 10 m lead to wider plumes, but the effect was moderate with the length to width ratio changing from 12 to 25, and the median breakthrough time at 18 km downstream from the source changing from 980 to 3000 years.

    2. Characteristics of CO2-driven cold-water geyser, Crystal Geyser in Utah: experimental observation and mechanism analyses (pages 283–297)

      W. S. Han, M. Lu, B. J. McPherson, E. H. Keating, J. Moore, E. Park, Z. T. Watson and N.-H. Jung

      Version of Record online: 20 FEB 2013 | DOI: 10.1111/gfl.12018

    3. In situ decarboxylation of acetic and formic acids in aqueous inclusions as a possible way to produce excess CH4 (pages 298–304)

      A. Ong, J. Pironon, P. Robert, J. Dubessy, M.-C. Caumon, A. Randi, O. Chailan and J.-P. Girard

      Version of Record online: 12 MAR 2013 | DOI: 10.1111/gfl.12026

      Thumbnail image of graphical abstract

      Organic acids derived from petroleum fluids and dissolved in formation water might suffer decarboxylation upon postentrapment heating within the aqueous inclusion chamber, thereby generating excess CH4 in the inclusions. Fused silica capillary capsules (FSCCs), mimicking aqueous inclusions, were filled with acetic or formic acid solution and heated to 250°C in closed-system conditions. Thermal decarboxylation of acetic acid producing CH4 (and CO2) in the FSCC is observed, which confirms the possible enrichment in CH4 in aqueous inclusions after entrapment.

    4. Geodynamic processes in the NW Bohemian swarm earthquake region, Czech Republic, identified by continuous gas monitoring (pages 305–330)

      F. H. Weinlich, V. Stejskal, M. Teschner and J. Poggenburg

      Version of Record online: 21 MAR 2013 | DOI: 10.1111/gfl.12027

      Thumbnail image of graphical abstract

      Time series of a multiyear gas monitoring at three stations along seismoactive faults and at a mofette are presented. It revealed variations in gas concentration and gas flux in an hydraulic conductive fault network in the NW Bohemian swarm earthquake region (Cheb Basin, Czech Republic) caused by geodynamic processes. The seasonal trend of the monitored CO2 concentration is governed by groundwater temperatures, deviations from the trend can be used to identify long-term changes of stress. Changes in CO2 gas flux and CO2 concentrations at two sites probably caused by fault movements.

    5. Simulation of the impact of faults on CO2 injection into sandstone reservoirs (pages 344–358)

      S. M. Pasala, C. B. Forster, M. Deo and J. P. Evans

      Version of Record online: 8 APR 2013 | DOI: 10.1111/gfl.12029

      Thumbnail image of graphical abstract

      CO2 concentration in the reservoir and overlying strata in a high-permeability fracture-dominated fault case after 500 days of injection.

    6. Deformation bands and their impact on fluid flow in sandstone reservoirs: the role of natural thickness variations (pages 359–371)

      A. Rotevatn, T. H. Sandve, E. Keilegavlen, D. Kolyukhin and H. Fossen

      Version of Record online: 11 APR 2013 | DOI: 10.1111/gfl.12030

      Thumbnail image of graphical abstract

      We address numerically the effect of thickness variations of low-permeable deformation bands in sandstones reservoirs. Such thickness variations have previously been considered as significant for controlling how deformation bands affect fluid flow. Here, we show that (i) on the scale of flow across individual bands, thickness variations may have minor effects; (ii) on an aquifer/reservoir scale, the effects of deformation band thickness variations are negligible; (iii) deformation band connectivity and permeability, not thickness variations, are important.

    7. Experimental determination of CePO4 and YPO4 solubilities in H2ONaF at 800°C and 1 GPa: implications for rare earth element transport in high-grade metamorphic fluids (pages 372–380)

      P. Tropper, C. E. Manning and D. E. Harlov

      Version of Record online: 13 APR 2013 | DOI: 10.1111/gfl.12031

      Thumbnail image of graphical abstract

      The solubility of synthetic CePO4 and YPO4 crystals in H2ONaF fluids at 800°C and 1 GPa has been determined. Solubilities of both rare earth elements (REE) phosphates are significantly greater in NaF than in NaCl at equivalent salt concentration. The results indicate that Y, and by extension HREE, can be fractionated from LREE in fluorine-bearing saline brines which may accompany granulite-facies metamorphism. The new data support previous indications that REE/Y mobility at these conditions is enhanced by complexing with F in the aqueous phase.

    8. The sources and formation processes of brines from the Lunnan Ordovician paleokarst reservoir, Tarim Basin, northwest China (pages 381–394)

      J. Chen, D. Liu, P. Peng, C. Yu, B. Zhang and Z. Xiao

      Version of Record online: 10 APR 2013 | DOI: 10.1111/gfl.12033

      Thumbnail image of graphical abstract

      Based on the water chemistry, the oilfield waters in the Middle-Lower Ordovician paleokarst reservoir of the Lunnan oilfield is proposed as a mixed result between diagenetically-altered meteoric waters and diagenetically-altered evaporated seawaters in the past. Figure A and B show the possible times of meteoric water entering the reservoir.

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