Geofluids

Cover image for Vol. 14 Issue 2

May 2014

Volume 14, Issue 2

Pages i–i, 127–250

  1. Issue Information

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

      Article first published online: 6 MAY 2014 | DOI: 10.1111/gfl.12082

  2. Original Articles

    1. Top of page
    2. Issue Information
    3. Original Articles
    1. Review of ‘Too Hot To Touch: The Problem of High-Level Nuclear Waste' by William M. Alley and Rosemarie Alley (page 127)

      E. M. Kwicklis

      Article first published online: 11 NOV 2013 | DOI: 10.1111/gfl.12068

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      “Too Hot to Touch” by Bill and Rosemarie Alley chronicles the intermittent 60-year effort by the federal government to find a permanent solution for the disposal of high-level nuclear waste. It is a fascinating and well-told story that draws on a combination of public media and government reports. It is not optimistic that a solution to the problem will soon be found given the social, political, and technical challenges.

    2. Diffusion and kinetic control of weathering layer development (pages 128–142)

      D. Reeves and D. H. Rothman

      Article first published online: 2 AUG 2013 | DOI: 10.1111/gfl.12056

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      The formation of porous weathering rinds on the exterior of rocks is a consequence of mineral dissolution and precipitation occurring at the solid–fluid interface within the pores. We describe conditions under which reaction and diffusion-limited scenarios apply and how, under those conditions, the rind thickness varies with time and rock shape. Furthermore, we argue that variability in weathering over ensembles of grains contributes to the gradual decrease over time of total weathering rates, as previously reported.

    3. Carbon dioxide controlled earthquake distribution pattern in the NW Bohemian swarm earthquake region, western Eger Rift, Czech Republic – gas migration in the crystalline basement (pages 143–159)

      F. H. Weinlich

      Article first published online: 22 AUG 2013 | DOI: 10.1111/gfl.12058

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      Ascending mantle-derived CO2 induces mineral reactions between dissolved CO2 and silicate minerals. The kaolinitic – montmorillonitic alteration products cause fault weakness by reducing the friction coefficient μ resulting in fault creep. Stress build-up and seismicity occur at the transition zone to the unaltered fault segment with frictional strength at the northern border of the Cheb Basin in the Nový Kostel area. In vertical regard, the seismicity starts with the phase separation according to the phase behaviour of CO2-H2O systems. The CO2-driven formation of phyllosilicates (kaolinite) reduces the friction coefficient η to η' and thus the angel of internal friction (shear line), inducing a fracture failure that is, fault creep in the weak fault segments between θ' and θ''.

    4. Fractal analysis of veins in Permian carbonate rocks in the Lingtanchang anticline, western China (pages 160–173)

      B. Deng, S. Liu, L. Jansa, S. Yong and Z. Zhang

      Article first published online: 20 AUG 2013 | DOI: 10.1111/gfl.12059

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      A field-based methodology with statistical analysis of vein patterns. A power-law distribution with various Dt and Cv values for different veins. A percolating cluster model controlled multistage vein growth and paleofluid flow.

    5. Fluid effect on hydraulic fracture propagation behavior: a comparison between water and supercritical CO2-like fluid (pages 174–188)

      X. Zhou and T. J. Burbey

      Article first published online: 12 SEP 2013 | DOI: 10.1111/gfl.12061

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      Hydraulic fractures can be induced during fluid injection. Thin fluids with properties of supercritical CO2 will create relatively thin and much shorter fractures in comparison with fluids exhibiting properties of water under similar injection schemes. Two significant times are recognized during fracture propagation at a constant injection flow rate: the time at which a crack ceases opening and the later time point at which a crack ceases propagating. These times are different for different fluids.

    6. Impacts of Pleistocene glacial loading on abnormal pore-water pressure in the eastern Michigan Basin (pages 200–220)

      O. Khader and K. Novakowski

      Article first published online: 21 JAN 2014 | DOI: 10.1111/gfl.12074

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      A hydromechanical model was applied using multiple glacial loading cycles to the Michigan Basin to investigate the generation of significant under and overpressures observed in the eastern margin. The results show that a particular glacial cycle of ~ 100 ka applied at least four times will generate the observed underpressures in low-permeability Ordovician formations. The generation of the underpressure is attributed to the presence of a permeable Cambrian aquifer underlying the Ordovician units that acts to drain pore fluids during loading events.

    7. Numerical simulation of mylonitization and structural controls on fluid flow and mineralization of the Hetai gold deposit, west Guangdong, China (pages 221–233)

      J. Zhu, Z . Li, G. Lin, Q. Zeng, Y. Zhou, J. Yi, G. Gong and G. Chen

      Article first published online: 29 NOV 2013 | DOI: 10.1111/gfl.12069

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      In this paper, we present numerical results of mylonitization and structural controls on fluid flow and mineralization of the HGD. First, mylonitization in the HGD was simulated. The calculated differential stress has a value of 483~650 MPa, consistent with estimates of ore-forming pressure. Second, structural controls on fluid flow and mineralization during mylonitization was highlighted in the results. Shear zones are favorable environment for the development of mylonitization zones, and the mylonitization zone can provide a zone of fluid focusing and ore formation.

    8. Effects of episodic fluid flow on hydrocarbon migration in the Newport-Inglewood Fault Zone, Southern California (pages 234–250)

      B. Jung, G. Garven and J. R. Boles

      Article first published online: 17 DEC 2013 | DOI: 10.1111/gfl.12070

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      Computational models for both episodic and continuous hydrocarbon migration are constructed to investigate large-scale fluid flow and petroleum accumulation along the Newport-Inglewood fault zone. Episodic flow appears to enhance strongly hydrocarbon accumulation by enabling stepwise build-up in oil saturation in adjacent sedimentary formations due to periodic fault rupture, and the estimated oil volume in the Inglewood oil field can be accumulated in about 24 000 years, assuming a seismically induced fluid flow event occurs every 2000 years.

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