Geomechanical Modelling of Fault-related Fractures in the Toolachee Formation of the Barrolka Field, Queensland
Aaron J. Hollingsworth - 2014
Honours Degree of Bachelor of Science (Petroleum Geology and Geophysics)
Australian School of Petroleum
The University of Adelaide
The Toolachee Formation in the Barrolka Field contains a basin-centred gas accumulation , and open fracture permeability plays an important role in accessing the hydrocarbons. Recently an amplitude variation with azimuth (AVAZ) study by Tyiasning (2014) indicated varying seismic anisotropy, both in magnitude and orientation, across the Barrolka Field. One cause of such anisotropy could be open fractures that resulted from recent faulting in the area.
Geomechanical models based on the recent faulting were made, and the fracture information that they provided looked at. Based the modelled fracture orientations with the current day stress field, it was deemed unlikely that a significant amount of open fracturing exists within the Toolachee Formation at the Barrolka Field.
The geomechanical models were also unable to adequately account and explain the anisotropy derived from the AVAZ study.