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在采用目前常用的烃源岩酸解处理有机碳分析方法时,常会有一部分有机质随酸解液流失,造成有机碳测量结果偏低。针对这一问题,通过常规有机碳分析流程获取酸解液,加入NaCl使其达到过饱和后萃取,获得有机碳含量为10%左右的可溶有机质流失物,进一步分析显示,它们主要是短链脂肪酸、4-羟基脂肪酸、芳香酸和芳香酸酐等有机酸(盐)类化合物;作为优质生气母质,每100 g岩样中至少可生成40 mL的甲烷气,因此,对于大量含碳酸盐岩的烃源岩地层,有机碳分析流程中应增加冲洗液中有机质再萃取这一环节。
In the current commonly used methods for the treatment of organic carbon by acid hydrolysis of source rock, some organic compounds often lose with the acid solution, resulting in a low organic carbon measurement. In response to this problem, the acid solution was obtained by the routine organic carbon analysis procedure, NaCl was added to make it supersaturated and then extracted to obtain the soluble organic matter with the organic carbon content of about 10%. Further analysis showed that they were mainly short chain Fatty acids, 4-hydroxy fatty acids, aromatic acids and aromatic anhydrides. As a high-quality gas parent material, at least 40 mL of methane gas can be produced per 100 g of rock sample. Therefore, for a large amount of carbonates Of the source rock strata, organic carbon analysis process should increase the rinse liquid organic matter re-extraction of this link.