A New Method to Measure the Value of Organic Abundance in Carbonate Rocks
doi: 10.14027/j.cnki.cjxb.2016.01.019
Funds:
The Key Project of West Light; National Key Basic Research Program of China(973 Program), NO.2012CB214801; Key Laboratory Fund of Gansu Provincial, NO.1309RTSA041
- Received Date: 2015-01-19
- Rev Recd Date: 2015-05-07
- Publish Date: 2016-02-10
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Key words:
- carbonate rocks /
- organic abundance /
- turface /
- elemental analysis
Abstract: Considering the organic carbon in the acid solution, a new method is presented for measuring organic carbon in carbonate. It utilizes turface to thicken the residue& acid solution, then the carbon content of sample is analyzed by Elements Analyzer. We prepared standard samples (CaCO3+SiO2+ organic materials) to have common TOC test and new method test. Results showed: The common TOC test of standard samples which added acetic acid, calcium acetate, phenylformic acid and calcium benzoate showed a high relative error in TOC value from 98.50% to 99.66%; The common TOC test of standard samples which added stearic acid, calcium stearate, I-II type kerogen and II-III type kerogen showed a lower relative error in TOC value from 11.90% to 48.12%;The new TOC method test showed a lowest relative error in TOC value from 0.76% to 19.46%. The new TOC method test of standard samples with different TOC Theoretical values showed that the relative error decreased with TOC concentration increasing. Because of mixing and thickening the residue and acid solution after removing the inorganic carbon in initial step, it avoided the organic carbon from loss and could accurately quantify TOC value.
| Citation: | LIU Peng, WANG XiaoFeng, FANG Xuan, ZHENG JianJing, LI XiaoFu, MENG Qiang. A New Method to Measure the Value of Organic Abundance in Carbonate Rocks[J]. Acta Sedimentologica Sinica, 2016, 34(1): 200-206. doi: 10.14027/j.cnki.cjxb.2016.01.019
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