What is the term for disseminated organic matter in sediments that is insoluble in normal petroleum solvents?

What is the term for disseminated organic matter in sediments that is insoluble in normal petroleum solvents?

• A. Kerogen
• B. Bitumen
• C. Asphalt
• D. Humic substances

Answer: (A)

Disseminated organic matter that remains insoluble in normal petroleum solvents is kerogen. Kerogen is the solid, insoluble fraction of organic material distributed throughout sedimentary rocks. It’s the starting material that, with increasing heat and pressure during burial, breaks down to generate oil and natural gas. The key trait that defines it here is its insolubility in common petroleum solvents, which distinguishes it from liquid or soluble hydrocarbon materials like bitumen or asphalt. Humic substances, while also organic, are typically associated with soils and aren’t the sedimentary kerogen that acts as the hydrocarbon precursor.

Disseminated organic matter that remains insoluble in normal petroleum solvents is kerogen. Kerogen is the solid, insoluble fraction of organic material distributed throughout sedimentary rocks. It’s the starting material that, with increasing heat and pressure during burial, breaks down to generate oil and natural gas. The key trait that defines it here is its insolubility in common petroleum solvents, which distinguishes it from liquid or soluble hydrocarbon materials like bitumen or asphalt. Humic substances, while also organic, are typically associated with soils and aren’t the sedimentary kerogen that acts as the hydrocarbon precursor.