Fault Permeability and Strength Evolution Related to Fracturing and Healing Episodic Processes (Years to Millennia): the Role of Pressure Solution

J.-P. Gratier

doi:10.2516/ogst/2010014

Fault Permeability and Strength Evolution Related to Fracturing and Healing Episodic Processes (Years to Millennia): the Role of Pressure Solution

Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles ◽

10.2516/ogst/2010014 ◽

2011 ◽

Vol 66 (3) ◽

pp. 491-506 ◽

Cited By ~ 42

Author(s):

J.-P. Gratier

Keyword(s):

Pressure Solution ◽

Strength Evolution ◽

Fault Permeability

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Role of pressure solution in the formation of bedding-parallel calcite veins in an immature shale (Cretaceous, southern UK)

Geological Magazine ◽

10.1017/s0016756818000377 ◽

2018 ◽

Vol 156 (5) ◽

pp. 918-934 ◽

Cited By ~ 5

Author(s):

QINGFENG MENG ◽

JOHN HOOKER ◽

JOE CARTWRIGHT

Keyword(s):

Critical Role ◽

Maximum Principal Stress ◽

Feedback Mechanism ◽

Black Shales ◽

Pressure Solution ◽

Overburden Pressure ◽

Axis Orientation ◽

Calcite Veins ◽

Fibre Growth

AbstractBedding-parallel fibrous calcite veins in black shales (Cretaceous, southern UK) were investigated using a combined field, stable isotopic geochemistry, petrographic and crystallographic method to examine their formation mechanism. Calcite veins occur in all shale beds and are most abundant in the bituminous shales of the Chief Beef Beds. The calcite fibres in these veins exhibit either an antitaxial fibre growth with curvy stylolites as the median zone, or a predominantly syntaxial, upwards growth. The calcite veins range from –0.49 to 1.78‰ of δ13C values, and –6.53 to –0.03‰ of δ18O values, which are both similar to those of their host shales. Our petrographic observations demonstrate that subhorizontal and interconnecting microstylolite networks commonly occur within the calcite veins. Equant calcite grains in the median zones exhibit indenting, truncating and also interpenetrating grain contacts. It is interpreted that the fibrous calcite veins were sourced by neomorphic calcite from their host shales, with evidence from the δ13C signatures, pressure-solution features (stylolites, microstylolites and grain contact styles) and embedded fossil ghosts within the veins. The diagenetic fluids, from which calcite was precipitated, were a mixing of the original seawaters and 18O-depleted meteoric waters. Development of bedding-parallel calcite veins is considered to have been enhanced by pressure solution as a positive feedback mechanism, which was facilitated by the overburden pressure as the maximum principal stress. Calcite fibres, with a predominant subvertical c-axis orientation, exhibit a displacive growth in porous shales and a replacive growth at vein-limestone contacts. This study highlights the critical role of pressure solution in the formation of bedding-parallel calcite veins during burial and diagenesis of immature black shales.

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Role of electrochemical reactions in pressure solution

Geochimica et Cosmochimica Acta ◽

10.1016/j.gca.2009.02.012 ◽

2009 ◽

Vol 73 (10) ◽

pp. 2862-2874 ◽

Cited By ~ 43

Author(s):

George W. Greene ◽

Kai Kristiansen ◽

Emily E. Meyer ◽

James R. Boles ◽

Jacob N. Israelachvili

Keyword(s):

Electrochemical Reactions ◽

Pressure Solution

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Microstructural Aspects of Zeolite Formation in Alkali Activated Cements Containing High Levels of Fly Ash

MRS Proceedings ◽

10.1557/proc-370-197 ◽

1994 ◽

Vol 370 ◽

Cited By ~ 7

Author(s):

A.R. Brough ◽

A. Katz ◽

T. Bakharev ◽

G-.K. Sun ◽

R.J. Kirkpatrick ◽

...

Keyword(s):

Fly Ash ◽

Substantial Effect ◽

Ion Concentration ◽

Microstructure Development ◽

Waste Solution ◽

High Sodium ◽

Strength Evolution ◽

Zeolite Formation ◽

Alkali Activated

AbstractWasteforms made by reaction at elevated temperature of a highly alkaline simulated low-level nuclear waste solution, having high sodium ion concentration, with a cementitious blend high in fly ash have been studied. Significant formation of Na-P1 zeolite (gismondine framework) and of a sodalite occurred. The time evolution of the crystalline phases over the first 28 days is reported for both adiabatic and isothermal curing, and the role of these phases in microstructure development is discussed. The level of carbonate ions in solution was found to have a substantial effect on strength evolution and chemistry.

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