Geological carbon storage site characterization using a dual element seismic recording technology.

Area of Science:

• Geophysics
• Geological Carbon Storage

Background:

• Geologic carbon storage is crucial for reducing atmospheric carbon dioxide (CO2).
• Denmark is actively characterizing onshore sites for carbon storage, focusing on domal structures.
• Site characterization requires advanced geophysical methods for accurate subsurface imaging.

Purpose of the Study:

• To innovate and upscale a cost-effective dual-element recording system for onshore geologic carbon storage site characterization.
• To improve the imaging of near-surface and deeper geological structures relevant to carbon storage.
• To de-risk geological carbon storage projects in Denmark through enhanced data acquisition.

Main Methods:

• Development and deployment of a dual-element recording system combining landstreamer and wireless recorders.
• Acquisition of geophysical data at the Rødby structure, a key site for carbon storage.
• Analysis of landstreamer and nodal data to delineate geological formations and faults.

Main Results:

• The dual-element system provided enhanced imaging of near-surface structures and retained higher resolution for toplap structures and smaller faults.
• Landstreamer data effectively imaged faults in the primary reservoir (Bunter Sandstone Formation) and overlying seals (Fjerritslev, Ørslev, Falster Formations).
• The secondary seal (Vedsted Formation) appeared unfaulted, and glacial valleys were identified near the surface.

Conclusions:

• The complementary landstreamer and nodal datasets significantly de-risk geological carbon storage in Denmark.
• The developed dual-element recording system is a recommended solution for onshore carbon storage site characterization globally, especially where logistical challenges are manageable.