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4 results about "Passive seismic" patented technology
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Passive seismic is the detection of natural low frequency earth movements, usually with the purpose of discerning geological structure and locate underground oil, gas, or other resources. Usually the data listening is done in multiple measurement points that are separated by several hundred meters, over periods of several hours to several days, using portable seismometers. The conclusions about the geological structure are based on the spectral analysis or on the mathematical reconstruction of the propagation and possible sources of the observed seismic waves. If the latter is planned, data are usually acquired in multiple (in the ideal case - all) points simultaneously, using so called synchronized lines. Reliability of the time reverse modelling can be further increased using results of reflection seismology about the distribution of the sound speed in the underground volume.
Systems and methods for estimating coherency of active and passive seismic signals
PendingUS20260118542A1Seismic signal processingSeismology for water-loggingSeismic tracePassive seismic
A method may include receiving a plurality of seismic traces, from a plurality of seismic recorders associated with a geologic area of interest. The method may also involve modifying the plurality of seismic traces to obtain a consistent polarity for each seismic trace of the plurality of seismic traces. The method may then include generating a single waveform based on the plurality of modified seismic traces, and determining coherent energy values for the seismic events in the plurality of seismic traces based on the plurality of seismic traces and the single waveform.
Owner:SCHLUMBERGER TECH CORP
System and method for automatic detection of microseismic reflections in distributed acoustic sensing data
A method is described for automatically detecting shear-wave (S-wave) microseismic reflections using distributed acoustic sensing (DAS). The method includes obtaining raw DAS data; performing passive seismic event detection and phase picking; extracting a passive seismic event based on the passive seismic event phase picks to generate a seismic S-wave event gather; reducing noise in the raw DAS data; using the passive seismic S-wave event gather and the passive seismic event phases to identify an apex of a passive seismic S-wave event in the denoised DAS dataset and dividing it into two portions based on the apex; dip filtering the two portions to remove the direct arrival of the passive seismic S-wave events to generate a dip-filtered gather; and generating an S-wave microseismic reflection gather based on the dip-filtered gather.
Owner:CHEVRON USA INC
A method for slope fracture passive seismic wave imaging
ActiveCN119846714Bincrease diversityImprove stabilitySeismic signal receiversSeismic signal processingSignal onSeismometer
The application provides a kind of side slope fissure passive source seismic wave imaging method, the patent adopts multi-wave multi-component seismograph, simultaneously gathers multiple seismic wave signals on three components, including surface wave, body wave and the like.This design significantly improves the richness of data, so that in data processing, a variety of seismic wave signals can be comprehensively utilized for inversion analysis.By joint processing and constraint of different wave types, the multi-solution problem in geophysical inversion can be effectively reduced, and the stability and reliability of the results are improved.In addition, the acquisition of multi-component data makes the imaging more comprehensive, especially in the characterization of fissure directionality and geometric features, which has obvious advantages.
Owner:CHINA UNIV OF MINING & TECH
System and method for automatic detection of microseismic reflections in distributed acoustic sensing data
A method is described for automatically detecting shear-wave (S-wave) microseismic reflections using distributed acoustic sensing (DAS). The method includes obtaining raw DAS data; performing passive seismic event detection and phase picking; extracting a passive seismic event based on the passive seismic event phase picks to generate a seismic S-wave event gather; reducing noise in the raw DAS data; using the passive seismic S-wave event gather and the passive seismic event phases to identify an apex of a passive seismic S-wave event in the denoised DAS dataset and dividing it into two portions based on the apex; dip filtering the two portions to remove the direct arrival of the passive seismic S-wave events to generate a dip-filtered gather; and generating an S-wave microseismic reflection gather based on the dip-filtered gather.
Owner:CHEVRON USA INC