The Importance of Geochemical Parameters and Shale Composition on Rock Mechanical Properties of Gas Shale Reservoirs: a Case Study From the Kockatea Shale and Carynginia Formation From the Perth Basin, Western Australia

Labani, Mohammad Mahdi; Rezaee, Reza

doi:10.1007/s00603-014-0617-6

Cited by 74 publications

(23 citation statements)

References 18 publications

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“…The lowering values of the parameters tested (Tab. 3) by the authors is consistent with other results obtained in Poland (Bukowska 2012, Bukowski & Bukowska 2012, Josh et al 2012, Małkowski et al 2014) and elsewhere (Mitin & Timofeev 1970, Hoek & Brown 1997, Josh et al 2012, Li et al 2012, Abd El Megeed, 2013, Labani & Rezaee 2015, Lyu et al 2015.…”

Section: Fig 5 P-wave Velocity Reduction In Claystones Vs Time Of supporting

confidence: 83%

“…Earlier investigations of two of the current authors limited to the Łaziska Beds claystones (Małkowski et al 2014) showed much higher reduction (0.1-0.6R c ) of their strength values induced by water and similar to changes of the modulus of the linear elasticity. The results presented in the current paper are well comparable with those contained in several other papers on claystones: in Canada by Hoek and Brown (Hoek & Brown 1997) (strength fall by 30-90%), Australia (Labani & Rezaee 2015) (swelling -P V = 1-12%, and Rusia -the Ural region (Mitin & Timofeev 1970) (velocity of a longitudinal wave fall by only 10% after soaking).…”

Section: Fig 5 P-wave Velocity Reduction In Claystones Vs Time Of supporting

confidence: 78%

“…The swelling of clay rocks depends mainly on the presence of such layered aluminosilicates as smectites (including montmorillonite), illite, kaolinite and chlorites (Stoch 1974, Kabiesz 1988, Moore & Reynolds 1989, Bukowska 2012, Josh et al 2012. This phenomenon may result in increasing the volume of clay rocks by several to even 20-30% in a short time (Li et al 2012, Labani & Rezaee 2015, the dynamics of this process depends on the adsorption rate of water by clay minerals (Li et al 2012, Małkowski et al 2014, Labani & Rezaee 2015, Pimentel 2015.…”

Section: Impact Of Water On Mechanical Properties Of Rocksmentioning

confidence: 99%

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The impact of the mineral composition of Carboniferous claystones on the water-induced changes of their geomechanical properties

Małkowski

Ostrowski

Bożęcki

2017

geol

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Abstract:In this article, the authors describe the characteristics and changes of geomechanical properties of Carbonifeorus claystones as related to their mineral composition and the time of soaking in water. Geomechanical properties, including bulk density, Young modulus, Poisson ratio, unconfined compressive strength, durability index, and swelling index were examined in dry rock samples, and in water-soaked samples after 3 hours of soaking, and 6 hours of soaking respectively. Changes in the geomechanical properties of rocks were also examined as a function of their mineralogical composition. In particular, the properties of rocks were examined in relation to present aluminosilicates and layered aluminosilicates, respectively. Changes in the geomechanical properties were also examined relative to the presence of minerals anatase and siderite. Correlation coefficients between physical parameters and mineral composition were examined. It was determined that the total quantity of aluminosilcates is a better predictor of geomechanical properties after soaking, than only the content of layered aluminosilicates. Calculated correlation coefficients were generally higher for most samples after 6 hours of soaking than after 3 hours of soaking. It was also determined that the increase of bulk density correlates much better with the mineral anatase content, than with the siderite content.

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Section: Fig 5 P-wave Velocity Reduction In Claystones Vs Time Of supporting

confidence: 83%

Section: Fig 5 P-wave Velocity Reduction In Claystones Vs Time Of supporting

confidence: 78%

Section: Impact Of Water On Mechanical Properties Of Rocksmentioning

confidence: 99%

See 1 more Smart Citation

The impact of the mineral composition of Carboniferous claystones on the water-induced changes of their geomechanical properties

Małkowski

Ostrowski

Bożęcki

2017

geol

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“…The quartz, feldspar and carbonate are the minerals recognized as brittle components of tight shale rocks (Chen and Xiao 2013). Quartz content can increase the brittleness and clay content will decrease the rock strength and brittleness of shale layers (Labani and Rezaee 2015). A rock with higher brittle mineral content also has higher brittleness (Liu and Sun 2015).…”

Section: Introductionmentioning

confidence: 99%

Burial depth interval of the shale brittle–ductile transition zone and its implications in shale gas exploration and production

et al. 2017

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Brittleness and ductility of shale are closely related to shale gas exploration and production. How to predict brittleness and ductility of shale is one of the key issues in the study of shale gas preservation and hydraulic fracturing treatments. The magnitude of shale brittleness was often determined by brittle mineral content (for example, quartz and feldspars) in shale gas exploration. However, the shale brittleness is also controlled by burial depth. Shale brittle/ductile properties such as brittle, semibrittle and ductile can mutually transform with burial depth variation. We established a work flow of determining the burial depth interval of brittle-ductile transition zone for a given shale. Two boundaries were employed to divide the burial depth interval of shale brittle/ductile properties. One is the bottom boundary of the brittle zone (BZ), and the other is the top boundary of the ductile zone (DZ). The brittle-ductile transition zone (BDTZ) is between them. The bottom boundary of BZ was determined by the overconsolidation ratio (OCR) threshold value combined with pre-consolidation stress which the shale experienced over geological time. The top boundary of DZ was determined based on the critical confining pressure of brittle-ductile transition. The OCR threshold value and the critical confining pressure were obtained from uniaxial strain and triaxial compression tests. The BZ, DZ and BDTZ of the Lower Silurian Longmaxi shale in some representative shale gas exploration wells in eastern Sichuan and western Hubei areas were determined according to the above work flow. The results show that the BZ varies with the maximum burial depth and the DZ varies with the density of the overlying rocks except for the critical confining pressure. Moreover, the BDTZ determined by the above work flow is probably the best burial depth interval for marine shale gas exploration and production in Southern China. Shale located in the BDTZ is semi-brittle and is not prone to be severely naturally fractured but likely to respond well to hydraulic fracturing. The depth interval of BDTZ determined by our work flow could be a valuable parameter of shale gas estimation in geology and engineering.

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“…Meanwhile, borehole instability is an important problem restricting shale gas drilling [8][9][10]. Shale gas reservoirs generally have high strength and strong brittleness [11][12][13][14][15] and are a typical hard brittle shale. Borehole instability in such formations has not been effectively solved all the time [16][17][18], the borehole may still collapse with increasing borehole drilling time even though the pressure of the drilling fluid column is higher than the collapse pressure and the stress around the borehole is lower than the peak strength [16,19].…”

Section: Introductionmentioning

confidence: 99%

Permeability Change Caused by Stress Damage of Gas Shale

et al. 2017

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Stress damage of shale during the uniaxial loading process will cause the change of permeability. The study of stress sensitivity of shale has focused on the influence of confining pressure on shale permeability and the change of shale permeability during the loading process of axial stress is lacking. The permeability of gas shale during loading process was tested. The results show that shale damage macroscopically reflects the process of axial micro-cracks generation and expansion, and the axial micro-cracks will cause permeability change during the loading process. There is a good corresponding relationship between damage development and micro-crack expansion during the process of shale loading. The damage factor will increase in the linear elastic stage and enlarge rapidly after entering the stage of unstable micro-crack expansion, and the permeability of shale increases with the increasing of shale damage. The research results provide a reliable test basis for further analysis of the borehole instability and hydraulic fracture mechanisms in shale gas reservoirs.

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The Importance of Geochemical Parameters and Shale Composition on Rock Mechanical Properties of Gas Shale Reservoirs: a Case Study From the Kockatea Shale and Carynginia Formation From the Perth Basin, Western Australia

Cited by 74 publications

References 18 publications

The impact of the mineral composition of Carboniferous claystones on the water-induced changes of their geomechanical properties

The impact of the mineral composition of Carboniferous claystones on the water-induced changes of their geomechanical properties

Burial depth interval of the shale brittle–ductile transition zone and its implications in shale gas exploration and production

Permeability Change Caused by Stress Damage of Gas Shale

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