Experimental Study on the Generation of Organic Acids from Source Rocks and Its Effect Factors
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摘要: 不同温度下地层水—烃源岩相互作用模拟实验结果表明:(1)在整个实验温度范围内(60~300℃),均有有机酸的生成,有机酸的总浓度在35.4 mg/l至153.9 mg/l之间,其中在100℃和140℃的温度下浓度最大,其它温度下浓度相对较低;(2)在低温(60℃)条件下,成熟度相对较高、有机碳含量较大的烃源岩,有利于生成有机酸,但是在中温(140℃)和高温(180℃、220℃和300℃)条件下,有机酸的生成受有机碳含量、成熟度和碳酸盐含量的多重影响;(3)中低温(60℃和140℃)时,随着碳酸盐含量的增加,有机酸浓度表现为逐渐降低的趋势,表明在60~140℃,有机酸对碳酸盐的溶解和沉淀起主要的控制作用,而高温(180℃、220℃和300℃)条件下,碳酸盐的溶解和沉淀作用受有机酸和CO2的共同控制,从而导致有机酸浓度与碳酸盐的关系变化复杂。Abstract: The experimental results of formation watersource 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 (Ro)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 (Ro), 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 CO2 in the high temperature(180℃,220℃ and 300℃),it makes the correlation between organic acids and carbonate complicated.
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Key words:
- organic acid
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