Microscalemodeling of fluid flow-geomechanics-seismicity: Relationship between permeability and seismic source response in deformed rock joints

作者：Raziperchikolaee S; Alvarado V^*; Yin S

来源：JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2014, 119(9): 6958-6975.

DOI：10.1002/2013JB010758

• hydro-mechanical-seismicity coupled model
• dynamic pore network
• joint deformation
• joint permeability
• fracture source mechanism

Studying rock joint deformation including both slippage and opening mechanisms provides an opportunity to investigate the connection between the permeability and seismic source mechanisms. A microscale fluid flow-geomechanics-seismicity model was built to evaluate the transport response and failure mechanism of microcracks developed along a joint in Berea sandstone samples during deformation. The modeling method considers comprehensive grain-cement interactions. Fluid flow behavior is obtained through a realistic network model of the pore space in the compacted assembly. The geometric description of the complex pore structure is characterized to predict permeability of the rock sample as a function of rock deformation by using a dynamic pore network model. As a result of microcracks development, forces and displacements in grains involved in bond breakage are measured to determine seismic moment tensor. Shear and nonshear displacements are applied to the joint samples to investigate their effects on permeability evolution and failure mechanism of microcracks during joint deformation. In addition, the effect of joint roughness is analyzed by performing numerical compression tests. We also investigate how confining pressure affects volumetric deformation leading to opening or closure of developed microcracks and permeability changes of samples with joints.

• 出版日期2014-9