Organic geochemistry is a field of study that focuses on the chemical composition, structure, and reactions of carbon-containing compounds in geological materials. Researchers in this area investigate the distribution, abundance, and preservation of organic compounds in rocks, sediments, soils, and fluids found in the Earth's crust. They use analytical techniques such as gas chromatography, mass spectrometry, and nuclear magnetic resonance spectroscopy to identify and characterize organic molecules and study how they are formed, transformed, and degraded over time. Organic geochemistry plays a crucial role in understanding past environments, climate change, energy resources, and the cycling of carbon in the Earth system.