Abstract:
A method for de-ghosting seismic data includes receiving seismic data corresponding to plural depth sources or plural depth receivers located at a first depth and a second depth below a geophysical surface, wherein the second depth is below the first depth, where the plural depth sources or plural depth receivers comprise a first seismic receiver located at the first depth and a second seismic receiver located at the second depth, or, a first seismic source located at the first depth and a second seismic source located at the second depth. The method also includes aligning primary reflections within the seismic data to provide improved seismic data. A corresponding system is also disclosed herein.
Abstract:
A seismic survey system for surveying a subsurface. The system includes a volumetric land source buried underground for generating P-waves; a non-volumetric land source buried underground for generating P- and S-waves; plural receivers distributed about the volumetric and non-volumetric land sources and configured to record seismic signals corresponding to the P- and S-waves; and a controller connected to the volumetric land source and the non-volumetric land source and configured to shot them in a given pattern.
Abstract:
The present disclosure includes a method for reducing noise in seismic data using a frequency dependent calendar filter. The method for reducing noise in input seismic trace data includes obtaining a plurality of input seismic trace data, the plurality of input seismic trace data including a plurality of controlled signals and a plurality of uncontrolled signals, identifying a frequency content of the plurality of uncontrolled signals, and selecting a frequency dependent calendar filter based on the frequency content of the plurality of uncontrolled signals. The method further includes applying the frequency dependent calendar filter to the plurality of input seismic data to generate a plurality of output noise-reduced seismic traces. The present disclosure also includes associated systems and apparatuses.
Abstract:
A system and method for generating simultaneous plural frequencies in seismic exploration is disclosed. The method includes configuring a seismic source to emit a seismic signal that includes multiple frequencies emitted substantially simultaneously. The method additionally includes identifying a plurality of frequencies to include in the seismic signal and determining an amplitude of the seismic signal. The method further includes obtaining a seismic dataset corresponding to the seismic signal emitted by the seismic source and creating a seismic image of a subsurface of a seismic survey area.
Abstract:
The present disclosure includes a method for monitoring a subsurface formation including disposing an antenna in a horizontal wellbore, the antenna including a plurality of piezoelectric modules. A voltage signal is applied to at least one of the piezoelectric modules to cause the at least one piezoelectric modules to emit seismic energy into the subsurface formation. A resulting signal is received at a receiver. A property of the subsurface formation is determined based, at least in part, on the resulting signal.
Abstract:
The present disclosure includes a method for combining controlled and uncontrolled seismic data. The method includes accessing one or more controlled signals, each controlled signal associated with a respective receiver of a plurality of receivers. The method also includes accessing one or more uncontrolled signals, each uncontrolled signal associated with a respective receiver of the plurality of receivers. The method also includes generating one or more reconstructed signals based on the one or more uncontrolled signals. The method also includes generating a composite image based at least on the one or more controlled signals and the one or more reconstructed signals. The present disclosure may also include associated systems and apparatuses.
Abstract:
A system and method for correcting data after component replacement in continuous seismic exploration disclosed. The method includes calculating a first matching operator after a first component is replaced with a second component. The first matching operator is based on a first seismic trace recorded before replacement of the first component and a second seismic trace recorded after replacement of the first component. The method further includes correcting the second seismic trace by applying the first matching operator to the second seismic trace.
Abstract:
Systems and methods for wireless data acquisition in seismic monitoring systems are disclosed. The method includes obtaining a signal table for an emitted seismic signal, receiving seismic signal data from a receiver configured to transform seismic signals into seismic signal data, and storing the seismic signal data on a storage system. The method also includes determining a time span for the seismic signal data and generating a reduced data set based on the seismic signal data, the signal table, and the time span.
Abstract:
Method and device for generating an induced source shot point gather. The method includes receiving seismic data at least partially generated by an unintentional seismic source; calculating plural reconstructed receiver traces (RGi) based on pairing traces from the seismic data; and generating the induced source shot point gather based on the plural reconstructed receiver traces (RGi).
Abstract:
Methods and systems for monitoring a target volume are characterized by having sources and detectors buried under the weathering layer and comparing data corresponding to refracted waves acquired during different surveys to infer changes in the target volume, wherein locations of sources and detectors are the same for the different surveys.