Role of water−rock interaction in the geochemical evolution of Marcellus Shale produced waters

Phan, Thai T.; Vankeuren, Amelia N. Paukert; Hakala, J. Alexandra

doi:10.1016/j.coal.2018.02.014

Cited by 59 publications

(36 citation statements)

References 58 publications

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“…The correlation between minerals composition and porosity evolution is an essential topic for black oxidation process. A series of minerals reactions change the shale porosity, in turn, the evolution of porosity, especially the "active" pores -enable oxygen and uids ow into -determine the uid-rock reactions areas and control the kinetic rate of minerals reactions [3,4,12,[30][31][32][33][34][35][36]. Previous studies have well established the minerals-porosity correlations based on the chemical oxidation mechanism, but as a basic oxidation mechanism, the role of biological effect is seldom to report.…”

Section: Discussionmentioning

confidence: 99%

Correlation Study Between Minerals Composition and Porosity Evolution of Black Shale Under Different Oxidation Mechanisms

Zhu¹,

Li²,

Li³

2020

Preprint

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The correlation between rock minerals composition and porosity evolution is essential to black shale oxidation,chemical and biological effects may act different roles which is unclear. In present study, the acid solution and Acidithiobacillus ferrooxidans was applied to simulate the chemical and biological effects, the total organic carbon (TOC), pyrite and clay minerals content, porosity characteristics, micro-surfacemorphologyof black shale sampleswere employed to analyze the minerals-porosity correlation. Results showed that the chemical effect led to a greaterdecrease of pyrite and increase of clay minerals content than biological effect, which accompanied by a higherspecific surface areas and pore volume. These difference may attribute to the TOCcontent, which decreasedby acid erosion and led to the increase of macropores in chemical group, then promoted the minerals reactions; whereas the TOC content increased byattached and dead bacteria cell bodies on rock surface, led to the increase of micropores and less minerals reactions in biological group. It suggests that the correlation between minerals composition and porosity evolution is different in chemical and biological effects, is mainly due to the different alter trends of TOC content.

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Section: Discussionmentioning

confidence: 99%

Correlation Study Between Minerals Composition and Porosity Evolution of Black Shale Under Different Oxidation Mechanisms

Zhu¹,

Li²,

Li³

2020

Preprint

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“…A relatively high salinity of returned water is commonly reported in shale gas wells [39,[73][74][75]. In recent years, models have been developed to describe the salt transfer during the shut-in and flowback periods [40][41][42]76,77]. These models have been applied on field salinity data from Marcellus [41,42], Horn River [39,40,42], and Haynesville [42] shales to characterize fractures.…”

Section: On Flowback Chemical Analysismentioning

confidence: 99%

The Effect of Temperature on Flowback Data Analysis in Shale Gas Reservoirs: A Simulation-Based Study

Yang

Lai

et al. 2019

Energies

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During hydraulic fracturing, there is a temperature difference between the injected water and formation rock for shale gas wells. The objective of this study is to investigate how this temperature difference changes with time, and how it affects multiphase-flow modeling during the shut-in and flowback periods. We conducted numerical simulations to investigate the behaviors of fracture temperature in shale gas wells. The results show a significant increase in fracture temperature during the shut-in and flowback periods. Sensitivity analysis suggests that this temperature increase is strongly related to the thermal conductivity of formation rock, matrix permeability, and initial reservoir temperature. Simulation scenarios were further compared to investigate the effect of temperature on flowback data analysis. Without considering the thermal effect, flowback data analysis may yield an earlier fracture cleanup and overestimated fracture volume. In addition, this study suggests that the thermal effect may also have implications for optimizing flowback operations.

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“…Water-rock interaction is an important component of geotechnical engineering stability evaluations, and its study has been at the frontier of this field in recent years [8,9]. Rock is a porous material mainly composing a solid skeleton and pores.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dry-Wet Cycling on the Mechanical Properties of Rocks: A Laboratory-Scale Experimental Study

et al. 2018

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Taking Nanfen open-pit iron mine in Liaoning Province as the engineering background, this study analyzes the effect of water-rock circulation on the mechanical properties of rock through a combination of macro-mechanical experiments and microstructure tests in the laboratory. Uniaxial compression experiments and acoustic wave tests are used to determine the degradation law of the mechanical properties of chlorite under the periodic action of water. The experimental results show that dry-wet cycles have a continuous and gradual effect on the rock sampled: Its uniaxial compressive strength, elastic modulus, and acoustic velocity all decrease gradually with an increase in the number of cycles. After 15 wet-dry cycles, the uniaxial compressive strength and elastic modulus of the rock decreased by 34.21% and 44.63%, respectively. Electron microscope scans of the rock indicate that the particle size, characteristics, and pore distribution at the rock surface had changed significantly after water-rock interaction. Finally, a drainage system and sliding force monitoring devices have been arranged at the mine site that can effectively reduce the impact of water-rock interaction on the stability of the mine. This combination of macro-experiments and micro-analysis allowed the weakening effect of dry-wet cycles on slope rock to be studied quantitatively, providing a theoretical reference for stability evaluation in geotechnical engineering.

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Role of water−rock interaction in the geochemical evolution of Marcellus Shale produced waters

Cited by 59 publications

References 58 publications

Correlation Study Between Minerals Composition and Porosity Evolution of Black Shale Under Different Oxidation Mechanisms

Correlation Study Between Minerals Composition and Porosity Evolution of Black Shale Under Different Oxidation Mechanisms

The Effect of Temperature on Flowback Data Analysis in Shale Gas Reservoirs: A Simulation-Based Study

Effect of Dry-Wet Cycling on the Mechanical Properties of Rocks: A Laboratory-Scale Experimental Study

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