Abstract: This application relates to methods and apparatus for monitoring a geological formation that is or has been subjected to steam injection using a distributed fiber optic sensor apparatus to perform distributed fiber optic sensing on an optical fiber deployed in a borehole running through the geological formation to acquire a first set of measurement signals being indicative of disturbances acting on each of a plurality of longitudinal sensing portions of the first optical fiber where at least part of the optical fiber is disposed adjacent to at least a first electrode spaced apart from a second electrode and the first and second electrode are separated by a void that is filled with a gas and an electrical source applies a potential difference to the first and second electrodes such that an ionization event within the gas results in an avalanche multiplication.

Abstract: This application relates to methods and apparatus for monitoring a geological formation that is or has been subjected to steam injection using a distributed fibre optic sensor apparatus to perform distributed fibre optic sensing on an optical fibre deployed in a borehole running through the geological formation to acquire a first set of measurement signals being indicative of disturbances acting on each of a plurality of longitudinal sensing portions of the first optical fibre where at least part of the optical fibre is disposed adjacent to at least a first electrode spaced apart from a second electrode and the first and second electrode are separated by a void that is filled with a gas and an electrical source applies a potential difference to the first and second electrodes such that an ionisation event within the gas results in an avalanche multiplication.

Abstract: A computer-implemented method for processing and imaging seismic data without the use of cross-well seismic data includes in one aspect providing a first data set representative of a first 3D VSP of a first region of a subterranean formation, and providing a second data set representative of a second 3D VSP of a second region of the subterranean formation. The first data set and the second data set define a common region and are merged within the common region to produce a third data set representative of a third 3D VSP .

Abstract: A method includes providing a first data set representative of a first 3D VSP of a first region of a subterranean formation, and providing a second data set representative of a second 3D VSP of a second region of the subterranean formation. The first data set and the second data set define a common region of the subterranean formation. The first data set and the second data set are merged within the common region to produce a third data set representative of a third 3D VSP of the first and second regions of subterranean formation. The third data set is then stored on a computer readable medium.