Method and apparatus for locating gas hydrate

摘要

An exploration paradigm for detecting and/or characterizing gas hydrate deposits using either electromagnetic or seismic surveys, that accounts for the possibility that gas hydrate may accumulate in vertical or subvertical dikes. Geologic factors, such as the presence of the gas hydrate stability zone, indications that a prolific source of gas exists (or existed) below the gas hydrate stability zone and indications that a high flux of gas could be transported into the gas hydrate stability zone, may be considered as part of an exploration strategy. Data may be collected using seismic techniques, such as a walk-away vertical seismic profile techniques, or electromagnetic surveys that are adapted to detecting the presence of vertical or subvertical dikes. In one example, data processing and acquisition techniques may be adapted to detect hydrate dikes, and do not assume a horizontally isotropic earth model.

主权项

1. A method of detecting gas hydrate, the method comprising:
collecting electromagnetic surveying data about a region using an electromagnetic surveying technique; and characterizing at least one hydrate dike formation based at least in part on the electromagnetic surveying data, wherein characterizing the at least one hydrate dike formation includes estimating at least one of a dip and strike of a hydrate dike using the electromagnetic surveying data.