AVO Analysis and Reservoir Characterization

Download Brochure

Seismic Data QC and Preconditioning
- Creation of AVO and AVA forward models and comparison with gathers to ensure amplitude preservation
- Application of noise and/or multiple attenuation, scaling, spectrum enhancement and data regularization (if necessary) to facilitate AVO/AVA extraction and inversion
AVO Analysis
- Extracting AVO attributes from seismic gathers
- Intercept and Gradient, Rp, Rs
Well Log QC and Petrophysics/Rock Study
- Well log calibration, editing and prediction of missing curves (eg: s-sonic) as well as creating attribute curves (eg: LMR, Poisson’s Ratio, Young’s Modulus)
- Building of rock physics template for various facies
- Client horizon import and well log to seismic correlation
- Cross plotting attributes at both log and seismic frequencies to determine reservoir characteristics
Post and Pre-Stack Inversion
- Checking well logs and building relationship between Vp, Vs and density
- Extracting wavelet(s)
- Building low frequency models from well logs
- Post stack and/or prestack simultaneous inversion for Vp, Vs and density, and deriving other elastic properties upon request
- Post-stack inversion to produce p-impedance (Ip) and s-impedance (Is) volumes
- Pre-stack simultaneous inversion for Ip, Is and density (if sufficient offsets are available)
- Derivation of other seismic attributes such as LMR, Poisson’s Ratio and Young’s Modulus
- Cross plotting inversion attributes to separate reservoir from non-reservoir and produce 3D seismic volumes of cross plot zones
Facies Classification
- Using inversion attributes and empirical relationship from rock physics study
- Statistical classification with neural network algorithm
- With client supplied lithology/facies logs, perform Bayesian classification of cross plotted inversion attributes to predict lithology and/or fluid properties
- Output volumes of most probable facies and individual facies probabilities
Fracture Detection
- Feasibility study (geometry, offset/azimuth distribution, S/N ratio etc)
- Azimuthal amplitude analysis (AVAZ)
- Azimuthal velocity analysis (VVAZ) – target oriented with layer stripping
- AVAZ and VVAZ may be applied in conjunction with 5D trace interpolation
- Forward modeling of expected azimuthal variations in p-wave velocity (VVAz) and amplitude (AVAz) due to anisotropy and/or fractures (requires full waveform s-wave sonic)

Language:

AVO Analysis and Reservoir Characterization

Link