| 摘要 |
<p>A towed streamer apparatus comprises a plurality of micro electro-mechanical system (MEMS) sensors 200. One or more MEMS sensors of the plurality of MEMS sensors are configured to generate gravity measurement data. The MEMS sensors may be accelerometers e.g. comprising a cantilever beam and a seismic mass, and the gravity measurement data may be extracted 210 from the direct current (DC) component of the acceleration signal. Seismic data may also be extracted 212 from the acceleration signal. The one or more MEMS sensors transmit a digitized version of the gravity measurement data to a processing unit. The apparatus may further be configured to combine the gravity measurement data received from the plurality of MEMS sensors to compute a target gravity measurement value and detect changes in gravity based on the target gravity measurement value. Combining the gravity data may comprise averaging to remove noise. The towed streamer apparatus may be used in a time lapse survey to detect changes in gravity to the same region over a period of time.</p> |
