| 摘要 |
Disclosed is a method of characterising a subsurface volume 200. The method comprises: extracting a geobody (115, Fig.1) from seismic data arranged within a discretised volume comprising a plurality of cells 230, the geobody comprising a subset of the plurality of cells, each cell of the subset having one or more properties indicative of a particular fluid phase. The extraction of the geobody comprises: determining a propagation probability value for each cell indicative of the probability that a front will propagate through the cell; beginning from a source within the discretised volume, using the propagation probability value to calculate a travel time for each cell, the travel time describing the time the front takes to travel from the source point to the cell; and using the travel times to extract the geobody from the seismic data. The probability value may be used as a velocity or slowness for said front when calculating travel times. The boundary of the geobody may be defined by cells all having a single travel time attributed thereto. |
