The Geological Significance and Characteristics of Aromatic Fraction during Organic Acid Salt Generating Hydrocarbon

Key words: 
• organic acid salt /
• pyrolysis experiment /
• ketone /
• aromatic fraction

Abstract: In order to study on the evolution of hydrocarbongeneration by organic acid salt, pyrolysis experiment is taken on organic acid salt at a series of temperature point270℃, 320℃,360℃, 400℃ and 430℃. The experimental result indicates that organic acid salt can be largely produced into ketone compounds. The threshold temperature of largerquantity yield is between 320℃ and 360℃ and the peak production rate at 360℃, where the conversion rate of the organic acid salt reaches 39%. But beyond the 400℃ the production rate rapidly declines. This result suggests that magnesium salt converses into ketone at the lower temperature or same as that of hydrocarbongeneration. But this type of compounds is sensitive to thermal, so it is difficult to preserve at higher temperature. Therefore, as the index of estimating hydrocarbon generation by organic acid salt, the index of ketone is generally only suitable for the middlelow maturity hydrocarbon source rocks.