2:15 PM - 2:30 PM
[HSC07-14] Planning of conceptual MMV programs for offshore CCS projects
Keywords:CCS, MMV, CO2, Time-lapse seismic
Measurement Monitoring and Verification (MMV) plays a vital role in ensuring the safety and effectiveness of Carbon Capture and Storage (CCS) projects. MMV serves to verify storage integrity, confirming that injected CO2 remains securely contained in the target reservoirs. Additionally, MMV helps comply with regulations and assess project performance. It also prevents or mitigates operational and environmental risks associated with CO2 injection. By providing transparency and accountability, a proper MMV strategy is essential to gain public acceptance and to facilitate stakeholder engagement.
We carried out a conceptual study to derive effective MMV programs for potential CCS projects offshore Japan. First, a risk assessment was conducted to identify and evaluate any potential risks due to CO2 injection, resulting in the identification of major risks. These risks were subsequently ranked based on their severity and likelihood using the Boston square risk matrix. We then conducted a bow-tie analysis that can provide a visual representation of the identified risks, their causes, and mitigating barriers, indicating potential MMV techniques to deal with undesired scenarios. More than thirty MMV techniques were listed through the bow-tie analysis, and then they were evaluated based on the effectiveness and costs.
As surface and borehole seismic surveys have a certain cost impact, proper understanding of their feasibilities is helpful in optimizing MMV programs in both technical and economical perspectives. Therefore, we conducted modeling studies based on rock physics analysis and ray tracing. The use of a rock physics model allows changes in subsurface properties, such as an acoustic impedance, due to CO2 injection to be related to time-lapse seismic responses. Furthermore, ray tracing ensures optimum surface and borehole seismic survey geometries to sufficiently cover an area of review, i.e., a project area under the influence of CCS activities.
Along with outcomes form other subsurface studies and injection scenarios including well planning as well as adherence of various CCS guidelines, we designed conceptual MMV programs tailored for CCS projects offshore Japan. These comprehensive MMV plans comprise of various monitoring techniques covering marine environment, geosphere and storage complex, wells including injectors, observers, and any existing wells. While MMV programs need to be optimized throughout the CCS projects, the insights obtained from this conceptual study provided valuable information to sufficiently pursue CCS projects further. The applied study workflow can be utilized and implemented in diverse CCS projects, particularly for those in their early planning phases.
We carried out a conceptual study to derive effective MMV programs for potential CCS projects offshore Japan. First, a risk assessment was conducted to identify and evaluate any potential risks due to CO2 injection, resulting in the identification of major risks. These risks were subsequently ranked based on their severity and likelihood using the Boston square risk matrix. We then conducted a bow-tie analysis that can provide a visual representation of the identified risks, their causes, and mitigating barriers, indicating potential MMV techniques to deal with undesired scenarios. More than thirty MMV techniques were listed through the bow-tie analysis, and then they were evaluated based on the effectiveness and costs.
As surface and borehole seismic surveys have a certain cost impact, proper understanding of their feasibilities is helpful in optimizing MMV programs in both technical and economical perspectives. Therefore, we conducted modeling studies based on rock physics analysis and ray tracing. The use of a rock physics model allows changes in subsurface properties, such as an acoustic impedance, due to CO2 injection to be related to time-lapse seismic responses. Furthermore, ray tracing ensures optimum surface and borehole seismic survey geometries to sufficiently cover an area of review, i.e., a project area under the influence of CCS activities.
Along with outcomes form other subsurface studies and injection scenarios including well planning as well as adherence of various CCS guidelines, we designed conceptual MMV programs tailored for CCS projects offshore Japan. These comprehensive MMV plans comprise of various monitoring techniques covering marine environment, geosphere and storage complex, wells including injectors, observers, and any existing wells. While MMV programs need to be optimized throughout the CCS projects, the insights obtained from this conceptual study provided valuable information to sufficiently pursue CCS projects further. The applied study workflow can be utilized and implemented in diverse CCS projects, particularly for those in their early planning phases.