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Laboratory measurements on Vaca Muerta formation samples showstress-dependent elastic behavior and compaction at representative in-situconditions. Experimental results show that the analyzed samples exhibitelasto-plastic deformation and shear-enhanced compaction as the main plasticitymechanism. These experimental observations conflict with the anticipatedlinear-elastic response prior to the brittle failure reported in several workson the geomechanical characterization of the Vaca Muerta formation. Therefore,we present a complete laboratory analysis of samples from the Vaca Muertaformation showing experimental evidence of nonlinear elastic and unrecoverableshear-enhanced compaction. We also calibrate an elastoplastic constitutivemodel using these experimental observations; the resulting model reproduces theobserved phenomena adequately.

Shear-enhanced compaction analysis of the Vaca Muerta formation