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Characterizing fracture complexity, fracture type, and anisotropy in laminated formations

Dr. Aly Abdelaziz, Geomechanics Expert at Geomechanica Inc., presents his talk "Characterizing fracture complexity, fracture type, and anisotropy in laminated formations". Abstract: A series of laboratory true-triaxial hydraulic fracturing tests were carried out on shale outcrop and core at depth specimens from the Montney Formation. The tests replicated in-situ like open-hole fluid injection at depth. The testing scheme aimed at assessing the impacts of flaws/anisotropy, intermediate stress, and fluid viscosity. Another key aspect was to assess the strength anisotropy through an innovative sub-coring method to obtain testing plugs. The formation of fractures opening against σ2 instead of σ3 in the true-triaxial hydraulic fracturing experiments defies the dogmatic expectation that the fractures will always propagate against the smaller of the minimum principal stress direction and minimum the tangential stress. The results are a clear indication that the tensile strength anisotropy plays an equally important factor to the in-situ stresses with respect to fracture initiation and propagation. The outcome of this experimental work is a new conceptual model that is not tied only to the magnitude of the in-situ stress but rather identifies the plane with minimal mechanical resistance defined by the magnitude of the principal stress and the anisotropy in the tensile strength of the rock formation. Another important result of this experimental program confirms the influence of viscosity on the complexity of the associated fracture network. Additionally, it also highlights the significant importance of obtaining mechanical strength parameters to understand the material anisotropy. Speaker Bio: Dr. Aly Abdelaziz is a Geomechanics Expert at Geomechanica Inc. Dr. Abdelaziz holds a Bachelor of Science (Civil - Structural Engineering) from Benha University, Egypt, and received his PhD in 2023 from Professor Grasselli’s Geomechanics Group in the Civil & Mineral Engineering Department at the University of Toronto, Canada, where he also worked as a postdoctoral fellow. He has over eight years of professional experience in the field of geotechnical investigation and construction monitoring and material testing in an accredited laboratory in Dubai. His research interests include numerical representation of synthetic rock using spatial Voronoi tessellations and measuring the influence of machines on strains during testing. He also worked on true-triaxial hydraulic fracturing tests to develop an understanding of rock stimulation in the context of fracture type as well as its complexity.