A quantitative interpretation (QI) study was conducted to characterize four formations located in Alberta, Canada. The Montney formation is targeted for gas production, while the Cadomin, Baldonnel, and Belloy formations are intended for CO2 sequestration. In this occasion, a thorough discussion of the results and their applicability is presented, focusing on the rock physics inversion and its direct link with drilling operations and interpretation. The study is currently being extended to estimate pore pressure and effective stress in the Montney formation, along with the application of a direct probabilistic inversion to identify facies. These two workflows will further optimize drilling targets and enhance completion operations.
This paper builds upon a previous study that focused on reservoir characterization of four geological formations in Northwestern Alberta, Canada, specifically targeting gas production in the Montney formation and CO2 sequestration in the Cadomin, Baldonnel, and Belloy formations. Our objectives include presenting a comprehensive discussion of results, with a particular emphasis on the rock physics inversion's direct implications for drilling operations and interpretation. Close collaboration has played a pivotal role in obtaining valuable results, which are integral to the interpretation process. The study is being extended to estimate pore pressure and effective stress in the Montney formation. Additionally, a direct probabilistic inversion will be tested for facies identification, aiming to optimize drilling targets and enhance completion operations.
In this study, the methodology involved a comprehensive conditioning of seismic gathers, crucial for the Amplitude versus Offset (AVO) inversion workflow. This process included azimuthal seismic residual move-out alignment, amplitude balancing, and bandpass filtering, with a focus on improving inversion results. The gathers underwent a detailed QC, and a seismic Amplitude versus Azimuth (AVAZ) alignment ensured correct data alignment for seismic events across all incidence and azimuth angles. The aligned azimuthal angle stacks were then re-stacked into angle stacks ranging from 0-52°, with subsequent bandpass filtering to remove noise. Amplitude balancing was also performed to correct for geological transmission shadowing.
