TIME-LAPSE SEISMIC SURVEY OF A RESERVOIR REGION

摘要

A method of investigating a reservoir region in a subsurface formation by atime-lapse seismic survey, which subsurface formation comprises a furtherformation region adjacent to the reservoir region, which method comprises thesteps of obtaining data from a time-lapse seismic survey including seismicdata of the subsurface formation at a first point in time and a later point intime, processing the seismic data to obtain a seismic representation of changein a predetermined seismic parameter in the further formation region, whichseismic parameter is dependent on stress; interpreting the seismicrepresentation of change in the seismic parameter in the further formationregion for an indication of changes of stress distribution in the furtherformation region; and deriving a property of the reservoir region using theindication of change of stress distribution in the further formation region.