Experimental Study on the Generation of Organic Acids from Source Rocks and Its Effect Factors

Key words: 
• organic acid

Abstract: The experimental results of formation watersource rock interaction in different temperature suggest the following results:(1) organic acid is generated in the experimental temperatures（60～300℃）,the total contents of organic acids is between 35.4 mg/l and 153.9 mg/l. The contents of organic acids are higher in the temperatures of 100℃ and 140℃ than that other temperatures; (2) the source rocks with high maturity （Ro）and high total organic carbon content（TOC）are favorable to the generation of organic acids in the low temperature（60℃）,but the generation of organic acids are commonly controlled by the maturity （Ro）, total organic carbon content（TOC）and carbonate content of source rocks in the middle（140℃）and high temperature（180℃,220℃ and 300℃）;(3)the contents of organic acids gradually decrease with the increase of carbonate content in source rocks in the low and middle temperature（60℃ and 140℃）,it suggests that the dissolution and precipitation of carbonate are mainly controlled by organic acids in the range of 60℃ to 140℃,but the dissolution and precipitation of carbonate are commonly controlled by organic acids and CO2 in the high temperature（180℃,220℃ and 300℃）,it makes the correlation between organic acids and carbonate complicated.