Environmental Project

Old oil fields may be ideal for carbon sequestration
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When looking for places to sequester carbon, old oil fields may be a promising choice, according to a new study published in the journal Geology. Geophysicists from Stanford University analyzed the Delaware Basin – a sub-basin of the Permian Basin in western Texas and southeastern New Mexico – and found that injecting substances into older oil fields is less likely to cause earthquakes than if the substances are injected into a newer oil field. The geophysicists, No’am Dvory and Mark Zoback, noticed that the southern part of the basin had more seismic activity than the northern part, which has a long history of extraction. The seismic activity is primarily connected to salt water disposal, which occurs throughout the basin, according to Dvory. After creating models, the duo discovered that pore pressures in geologic formations in the northern part of the basin were lower.