In this study we present a range of shear-wave splitting (SWS) techniques applied to a microseismic data set from a gas field. These include SWS inversion using rock physics modelling, SWS tomography and frequency-dependent anisotropy modelling. The aim is to characterize the field fracture network. Overall, our results agree with the knowledge about the field geology and those obtained from other geophysical techniques. The magnitude of anisotropy is controlled by lithology and proximity to the NE-SW graben faults that cut the field formations. The predominant fracture strikes are consistent with the trends of the main faults (NE-SW and NW-SE) and the majority of the observations indicate subvertical fracture dip (>70o). The study highlights the potential of shear-wave splitting in microseismic data as a tool to characterise hydrocarbon reservoirs.
|Title of host publication||3rd Passive Seismic Workshop: Actively Passive!|
|Publisher||European Association of Geoscientists and Engineers, EAGE|
|Publication status||Published - 1 Jan 2011|
|Event||3rd Passive Seismic Workshop: Actively Passive! - Athens, Greece|
Duration: 27 Mar 2011 → 30 Mar 2011
|Conference||3rd Passive Seismic Workshop: Actively Passive!|
|Period||27/03/11 → 30/03/11|