In situ formation compaction monitoring in deep reservoirs using optical fibres

摘要

We have devised a new in situ monitoring method for the amount of stratified compaction in boreholes drilled several hundred metres underground. Successful monitoring using this method is expected to enable a quantified evaluation of ground compaction associated with natural gas production in the future. This newly developed epoch-making monitoring system differs from conventional monitoring methods for land subsidence in that it is designed to continuously monitor the amounts of displacement in several sections separately, using optical fibres fitted in the sensor assembly.