Patent application number | Description | Published |
20090245021 | RECONSTRUCTING LOW FREQUENCY DATA RECORDINGS USING A SPREAD OF SHALLOW AND DEEP STREAMERS - A technique includes obtaining first data indicative of seismic measurements acquired by seismic sensors of a first set of towed streamers and obtaining second data indicative of seismic measurements acquired by seismic sensors of a second set of towed streamers. The second set of towed streamers is towed at a deeper depth than the first set of towed streamers. The technique includes interpolating seismic measurements based on the first and second data. The interpolation includes assigning more weight to the second data than to the first data for lower frequencies of the interpolated seismic measurements. | 10-01-2009 |
20100195439 | SEISMIC ACQUISITION SYSTEM AND TECHNIQUE - An apparatus includes an array of seismic sensor units that are adapted to acquire measurements in connection with a land surface-based seismic survey. Each seismic sensor unit includes a particle motion sensor and a rotation sensor. | 08-05-2010 |
20110080808 | SENSOR ASSEMBLY HAVING A SEISMIC SENSOR AND A DIVERGENCE SENSOR - A sensor assembly having improved characteristics for use in surveying a subterranean structure includes a divergence sensor for positioning at or below a ground surface, where the divergence sensor includes a container containing a material and a pressure sensor immersed in the material. In addition, the sensor assembly includes a single-component seismic sensor that is external to the container of the divergence sensor. | 04-07-2011 |
20110082646 | Noise Attenuation in Passive Seismic Data - Passive seismic data is collected from measurements of seismic sensors in respective sensor assemblies, where the passive seismic data is based on measurements collected during periods when no active seismic source was activated. Attenuation of surface noise in the passive seismic data is performed using data from divergence sensors in at least some of the sensor assemblies. The passive seismic data with surface noise attenuated is output to allow for performing an operation related to a subterranean structure using the passive seismic data with the surface noise attenuated. | 04-07-2011 |
20110082647 | COMBINING SEISMIC DATA FROM SENSORS TO ATTENUATE NOISE - To perform noise attenuation for seismic surveying, a sensor assembly is deployed on a ground surface, where the sensor assembly has a seismic sensor to measure seismic waves propagated through a subterranean structure, and a divergence sensor comprising a pressure sensor to measure noise. First data is received from the seismic sensor, and second data is received from the divergence sensor. The first data and the second data are combined to attenuate noise in the first data. | 04-07-2011 |
20110085419 | SENSOR ASSEMBLY HAVING A SEISMIC SENSOR, PRESSURE SENSOR, AND PROCESSOR TO APPLY FIRST AND SECOND DIGITAL FILTERS - A sensor assembly includes a housing structure, a seismic sensor in the housing structure to measure seismic waves propagated through a subterranean structure, and a pressure sensor in the housing structure. A processor in the housing structure is configured to receive a first signal based on an output of the seismic sensor, and a second signal based on an output of the pressure sensor. First and second digital filters are applied to the first and second signals. Application of the first and second digital filters to the first and second signals causes production of a substantially zero output in response to input that includes just noise data detected at the seismic sensor and the pressure sensor. | 04-14-2011 |
20110211423 | Gravity Measurements Using Seismic Streamers - A technique facilitates collection and use of data on subterranean formations. The technique comprises obtaining gravity measurements through the use of seismic streamers. At least one streamer is provided such that each streamer has multiple sensors, e.g. accelerometers. The at least one streamer is towed with a tow vessel, and gravity data are accumulated via the multiple sensors during towing. | 09-01-2011 |
20120026834 | OBTAINING A RESPONSE BASED ON DIFFERENCING OF OUTPUTS OF SENSORS - A sensor assembly has first sensors spaced apart along a first direction, and second sensors oriented in a second direction generally orthogonal to the first direction. Differencing of outputs of the first sensors is performed, and differencing of outputs of the second sensors is performed. A signal output is produced by combining the differenced outputs of the first sensors and the differenced outputs of the second sensors, where the signal output represents a seismic response of a subterranean structure. | 02-02-2012 |
20120113749 | Computing a Calibration Term Based on Combining Divergence Data and Seismic Data - Divergence data is received from a divergence sensor and seismic data is received from seismic sensors, where the divergence sensor and seismic sensors are part of a sensor assembly. A calibration term is computed based on combining the divergence data and the seismic data, where the calibration term includes a first parameter that is related to a characteristic of the sensor assembly, and a second parameter that is related to a characteristic of a near-surface subterranean medium. | 05-10-2012 |
20120250460 | NOISE ATTENUATION USING ROTATION DATA - Measured seismic data is received from a seismic sensor. Rotation data is also received, where the rotation data represents rotation with respect to at least one particular axis. The rotation data is combined, using adaptive filtering, with the measured seismic data to attenuate at least a portion of a noise component from the measured seismic data. | 10-04-2012 |