Sedimentary Rocks

Sedimentary rocks are formed from pre-existing rocks or pieces of once-living organisms. They form from deposits that accumulate on the Earth's surface. Sedimentary rocks often have distinctive layering or bedding. Many of the picturesque views of the...
Carbon sequestration is the process of capturing and storing atmospheric carbon dioxide. It is one method of reducing the amount of carbon dioxide, the most commonly produced greenhouse gas, in the atmosphere with the goal of reducing global climate...
Geologic carbon sequestration is the process of storing carbon dioxide (CO2) in underground geologic formations. The CO2 is usually pressurized until it becomes a liquid, and then it is injected into porous rock formations in geologic basins. This method...
Atmospheric carbon dioxide comes from two primary sources—natural and human activities. Natural sources of carbon dioxide include most animals, which exhale CO2 as a waste product. Human activities that lead to CO2 emissions come primarily from energy...
In 2013, USGS released the first-ever comprehensive, nation-wide assessment of geologic carbon sequestration, which estimates a mean storage potential of 3,000 metric gigatons of carbon dioxide. The assessment is the first geologically-based,...
All of the sedimentary rock basins for the entire country, including onshore and state waters, were evaluated based on criteria in the geologic carbon sequestration assessment methodology. Those basins that met the minimum criteria for the assessment...
The minimum requirements for inclusion in the assessment included the following: The rock layer had to be below 3,000 feet, the level at which pressure is sufficient to keep CO2 in its liquid state. The rock layer had to have an impermeable seal to...
It is difficult to characterize one area as “the best,” because the answer depends on the question – best for what?   However, the area of the assessment with the most storage potential for carbon dioxide is the Coastal Plains region, which accounts for...
In the 2013 assessment, USGS did not look at the economics of geologic carbon sequestration.  What was assessed in this study was the technically accessible carbon dioxide storage potential, meaning it could be performed using today’s technology and...
According to the U.S. Energy Information Administration estimates that in 2011, the United States emitted 5.5 metric gigatons of energy-related CO2, while the global emissions of energy-related CO2 totaled 31.6 metric gigatons. Learn More: USGS Geologic...