Fault-controlled velocity modeling and tomographic inversion
High resolution tomographic inversion: velocity tomographic inversion constrained by geological structure regularization has global optimization, high resolution, high stability and efficiency, and small scale velocity anomalies can be delineated.
Fault-controlled velocity modeling and tomographic inversion: through the combination of hard constraints and soft constraints, the accuracy and reliability of fault velocity can be improved, and the imaging of fault shadow and geological structure in middle and deep layers can be greatly improved.
conventional structural velocity
conventional tomographic inversion
old PSDM result
fault-controlled structural velocity
fault-controlled tomographic inversion
new PSDM result
Full waveform inversion
COSL has developed the technology of full waveform inversion, including wavelet inversion, fault control constraint, Avoids cycle-skipping artifacts and other sub-techniques for velocity updates in deep water rugged seabed, shallow water gas cloud fuzzy area, achieved High-resolution deep velocity modeling and better imaging results.
reflection-based
old PSDM result
FWI velocity
new PSDM result
QPSDM technology
FWI guides Q modeling ,usually Velocity and Q have a strong consistency. FWI guides Q modeling can effectively improve the accuracy of the Velocity model and Q model,it can effectively solve the absorption effect of gas cloud shielding.
conventional tomographic inversion velocity
FWI velocity
FWI guides Q modeling
old PSDM result
new QPSDM result
Converted wave processing
The converted wave contains both P-wave and S-wave information,which can be used to obtain the properties of underground fluid, fractures and elastic parameters of rocks, and make up for the deficiency of P-wave exploration to a certain extent.COSL has the leading converted wave processing capability in China, which effectively improves the reliability of oil and gas reservoir prediction through the contrast and inversion of longitudinal and horizontal wave imaging.
PP Wave result
PS Wave result
PP Wave old result gas cloud slicing
PP Wave new result gas cloud
Broadband marine seismic processing
- Ghost is one of the significant noises in marine seismic data. The frequency notch caused by interference source ghost and receiver ghost leads to deletion of frequency components, which will seriously influence seismic data processing and imaging. The technology called high-resolution Radon transform algorithm which is developed by our company will remove source ghost and receiver ghost (Fig1-1). The frequency notch will be attenuated and the bandwidth will be broadened after de-ghosting processing.
Conventional Processing
Broadband Processing
which is developed by our company will remove source ghost and receiver ghost (Fig1-1). The frequency notch will be attenuated and the bandwidth will be broadened after de-ghosting processing.
Dual azimuth seismic data processing
- Industry has already demonstrated that wide azimuth seismic exploration is an effective way to solve illumination problem. Comparing with wide azimuth acquisition, dual azimuth seismic acquisition is a more economical way to obtain better imaging data than conventional results, especially in complex structure or low signal-to-noise ratio area.
Single Azimuth
Dual Azimuth
Imaging technology includes Kirchhoff PSDM, Beam, RTM.
According to different geological conditions, different migration methods can be chosen. Beam migration can handle multi-path events and can greatly enhance s/n ratio.RTM being based on a two-way wave equation, unlike Kirchhoff integral based techniques, it can properly image multiple path events such as prism waves and diffracted reflections.
Kirchhoff PSDM
Beam Migration
Kirchhoff PSDM
RTM Images |
