The world is facing a critical challenge: monitoring the ocean's carbon storage. As nations like Norway embark on ambitious projects to store CO2 in undersea reservoirs, a pressing question arises: How can we ensure this stored carbon stays put?
The Norwegian University of Science and Technology (NTNU) is at the forefront of this quest, providing answers to the fundamental queries of CO2 storage. Imagine trying to locate and track a massive amount of CO2, a task akin to finding a needle in a haystack. But here's where it gets fascinating: a groundbreaking technique called full-waveform inversion is changing the game.
At the Sleipner gas field in the North Sea, Norway, an impressive 20 million tons of CO2 have been injected into a saline aquifer, the Utsira Formation. This is the world's longest-running undersea CO2 storage project, and it's here that the NTNU's Centre for Geophysical Forecasting (CGF) researchers have made remarkable strides. They've employed full-waveform inversion to scrutinize data from Sleipner, collected through seismic imaging and other geophysical methods.
A recent study by CGF PhD Ricardo Jose Martinez Guzman reveals the technique's prowess in pinpointing CO2 locations and quantifying injected volumes. This method has evolved from being akin to 'foggy glasses' to providing a crystal-clear view of the CO2's journey. It's a revolution in our understanding of CO2 storage, according to Professor Philip Ringrose from CGF.
But how do we monitor CO2 in these deep-sea reservoirs? Currently, companies use ships to tow acoustic sensors over the storage sites, a time-consuming and costly process. CGF researchers are pushing the boundaries of geophysics to find more efficient methods. In land-based CO2 storage, drilling wells is an option, but this isn't feasible for deep-sea sites like those in Norway.
Enter the CGF's new laboratory, featuring a massive tank with a mockup of the Utsira Formation's top layer. This setup allows researchers to experiment with various measurement techniques, leveraging 30 years of Sleipner data for calibration and comparison. Postdoc Kasper Hunnestad, who oversees the lab, explains that they challenge the system by manipulating data and observing the outcomes.
The goal? To optimize monitoring techniques and reduce costs. By selectively removing data, researchers can determine the minimum data required for accurate CO2 distribution mapping. This could be a game-changer for the industry, as efficient monitoring is crucial for the success of undersea CO2 storage.
Looking ahead, CGF's industrial partners are keenly interested in the lab's findings. The potential for business growth is significant, as companies aim to offer CO2 tracking services to operators. Furthermore, the CGF's director, Martin Landrø, envisions a future where fibre optic cables, already used for communication across the ocean, could be deployed for CO2 monitoring. This innovative approach, inspired by their success in tracking whales, could revolutionize how we monitor carbon storage.
As the world grapples with climate change, these advancements in CO2 storage monitoring are crucial. But here's a controversial question: Are we doing enough to ensure the safety and effectiveness of these storage methods? The debate is open, and your thoughts are welcome.
