Extraction method of organic sulphur in carbonate rocks with low organic matter content

Abstract

The invention provides an extraction method of organic sulphur in carbonate rocks with low organic matter content. The extraction method comprises the following steps: 1) performing acid treatment oncarbonate rock samples to obtain acid treatment residual samples; 2) performing separation treatment on the acid treatment residual samples by using heavy fluid to obtain a first organic matter product; 3) performing pyrite removal treatment on the first organic matter product to obtain a second organic matter product; 4) dissolving the second organic matter product to obtain a targeted solution,and converting the organic sulphur in the targeted solution into precipitants, wherein a sulphur element in the precipitants is the organic sulphur in the carbonate rock samples. The method is easy tooperate, can eliminate an influence of non-organic sulphur in the carbonate rock samples on extraction of the organic sulphur, and can improve the purity of extracted organic sulphur.

Description

technical field [0001] The invention relates to an organic sulfur extraction technology, in particular to a method for extracting organic sulfur in carbonate rocks with low organic matter content, and belongs to the technical field of oil and gas geochemistry. Background technique [0002] Carbonate rocks refer to rocks mainly composed of deposited carbonate minerals (calcite, dolomite), among which, the content of carbonate minerals is greater than 50%, and the minerals that coexist with carbonate rocks include iron, aluminum, manganese, Phosphorus, sulfur, gypsum, anhydrite, potassium salt, etc. The strata-bound deposits produced in carbonate rocks include copper, lead, zinc, mercury, antimony, arsenic, uranium and other metal minerals, as well as celestite and barite , Fluorite, crystal, iceland stone and other non-metallic minerals. [0003] Carbonate rock oil and gas resources occupy an important position in the distribution of oil and gas resources in the world. Its o...

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Problems solved by technology

[0005] The invention provides a method for extracting organic sulfur in carbonate rocks with low organic matter content. The method is simple to operate, can eliminate the influence of non-organic sulfur in carbonate rock samples on the extraction of organic sulfur, and improves the efficiency and efficiency of organic sulfur extraction. Accuracy, thus effectively solving the problem that the organic sulfur content and isotope composition of carbonate rock formation samples cannot be accurately measured, and providing a more powerful tool for the restoration of paleo-marine environments and the evaluation of oil and gas resources during the depositional period of carbonate rock formations. evidence of