Reducing Uncertainty in Seismic Interpretation using Crosswell Seismic

Abstract

Crosswell seismic is an emerging technology which provides highly detailed images of the subsurface at reservoir scale. The technology has the potential to delineate complex structure, help verify existing interpretation and also can be used to monitor changes in the reservoir caused by enhanced recovery strategies. The technology employs tomographic surveying, whereby the transmitter and receiver are deployed in separate wells. Interwell structure and velocity can be obtained from reflection processing and direct wave processing respectively. In this paper an example of crosswell seismic is discussed where the technology produced high-resolution images of the geology between wells at 8 to 10 times the resolution of surface 3-D seismic data and revealed numerous faulted compartments in the reservoir previously unseen in the surface seismic. These results have lead to a new understanding of the field and improved the well design process.