Experimental study of the influence of geochemical features on the viscoelasticity of organic matter in shale

Zhang, Wei1; Zhang, Dongxiao2; Zhao, Junliang2

2022-09-01

10.1016/j.marpetgeo.2022.105785

MARINE AND PETROLEUM GEOLOGY   影响因子和分区

0264-8172

1873-4073

Understanding time-dependent mechanical properties is critical to perform geomechanical risk quantification and reduce the environmental impact of fracking operations. In this study, vitrinite reflectance test, scanning electron microscope (SEM)/helium ion microscope (HIM) observation, atomic force microscopy (AFM)-based nanoscale dynamic mechanical analysis (AFM-nDMA), and micro-Raman analysis were combined as a chemomechanical method to investigate the role of thermal maturation in affecting nanoscale viscoelasticity of organic matter with maceral classification. The results of 208 tested areas demonstrated that viscosity is negatively correlated with thermal maturity, while storage modulus is positively correlated with maturity, suggesting that such polymer-like to mineral-like process might be prone to fracture initiation. Moreover, chemical structure changes during the thermal evolution exhibited by micro-Raman analysis were found to contribute to the abovementioned mechanical variations. Characterization of viscoelasticity of organic matter considering geochemical features is a highly promising aspect for inclusion in petrophysical workflows, leading to improved design of hydraulic fracturing and homogenization modeling.

Thermal maturity Nanoscale dynamic mechanical analysis (nDMA) Viscoelasticity Micro-Raman Organic matter Shale

SCI ; EI

英语

通讯

Shenzhen Key Laboratory of Natural Gas Hydrates[ZDSYS20200421111201738]

Geology

Geosciences, Multidisciplinary

WOS:000822782100002

ELSEVIER SCI LTD

20222512249145

Biogeochemistry ; Chemical analysis ; Dynamics ; Environmental impact ; Nanotechnology ; Organic compounds ; Scanning electron microscopy ; Shale gas

Environmental Impact and Protection:454.2 ; Geochemistry:481.2 ; Natural Gas Deposits:512.2 ; Gas Fuels:522 ; Nanotechnology:761 ; Biochemistry:801.2 ; Organic Compounds:804.1 ; Physical Properties of Gases, Liquids and Solids:931.2

GEOSCIENCES

Web of Science

1.Peking Univ, Coll Engn, BIC ESAT ERE & SKLTCS, Beijing 100871, Peoples R China
2.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China

Zhang, Wei,Zhang, Dongxiao,Zhao, Junliang. Experimental study of the influence of geochemical features on the viscoelasticity of organic matter in shale[J]. MARINE AND PETROLEUM GEOLOGY,2022,143.

Zhang, Wei,Zhang, Dongxiao,&Zhao, Junliang.(2022).Experimental study of the influence of geochemical features on the viscoelasticity of organic matter in shale.MARINE AND PETROLEUM GEOLOGY,143.

Zhang, Wei,et al."Experimental study of the influence of geochemical features on the viscoelasticity of organic matter in shale".MARINE AND PETROLEUM GEOLOGY 143(2022).