A method for preparing high-purity kerogen
A technology of kerogen and samples, which is applied in the field of petroleum geological exploration, can solve the problems that cannot represent the overall characteristics, the loss of kerogen is large, and pyrite cannot be removed, so as to achieve the effect of ensuring dispersion, originality and data stability
Active Publication Date: 2019-11-08
PETROCHINA CO LTD
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Problems solved by technology
This method can quickly reduce a part of the amount of pyrite, but the broken fine powdery pyrite particles may also be surrounded by kerogen, and float on the surface of the heavy liquid with the kerogen during heavy liquid separation, affecting the kerogen Separation, also cannot remove all pyrite
In addition, the sinking part of the samples also took away a considerable amount of kerogen, resulting in greater loss of kerogen and differentiation, and the final recovered kerogen could not represent the overall characteristics
Method used
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Embodiment 1
[0046] Example 1: Preparation of high-purity kerogen from Datangpo Formation black shale in Well ZK2105
[0047] This embodiment 1 according to figure 1 The described process prepares high-purity kerogen, that is, the sample is pulverized and weighed first, and then subjected to hydrochloric acid treatment, hydrochloric acid-hydrofluoric acid treatment, and heavy liquid flotation test. If it is found that the sample cannot be effectively stratified, then the mass The sample after hydrochloric acid-hydrofluoric acid treatment is treated with dilute nitric acid with a fraction of 1-5%, followed by treatment with arsenic-free zinc particles-dilute hydrochloric acid, and heavy liquid flotation stratification to obtain high-purity kerogen.
[0048] The specific implementation steps are as follows:
[0049] (1) choose 50g organic carbon content to be the rock core sample of 3.5wt%, pulverize, cross 80 mesh stainless steel sieves, get the sample of particle size<0.18mm and be used f...
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Abstract
The invention provides a method for preparing high purity kerogen. The method comprises pulverizing a sample, carrying out sampling, orderly carrying out water immersion treatment, hydrochloric acid treatment, hydrochloric acid-hydrofluoric acid treatment and heavy liquid flotation test on the crushed sample, in order to solve the problem that effective layering is unsuccessful in the heavy liquid flotation test, treating the sample subjected to hydrochloric acid-hydrofluoric acid treatment through dilute nitric acid having a mass fraction of 1-5%, carrying out arsenic-free zinc granule-hydrochloric acid treatment, and carrying out heavy liquid flotation to obtain kerogen. The method solves the problem that partial sample heavy liquid flotation cannot realize effective separation, removes inorganic minerals such as pyrite in the kerogen and prepares high purity kerogen. Through the method, data is stable and inorganic mineral disturbance is avoided in later geochemistry, structuralism and petrologic analysis.
Description
technical field [0001] The invention relates to a method for preparing high-purity kerogen, which belongs to the technical field of petroleum geological exploration. Background technique [0002] Kerogen refers to a solid high molecular polymer that is widely dispersed in rocks, insoluble in organic solvents at normal temperature and pressure, has no specific composition and structure, and has complex components. Kerogen is the main body of organic matter in sedimentary rocks, accounting for about 80% to 90% of the total organic matter. Modern petroleum geology believes that more than 80% of petroleum hydrocarbons are transformed from kerogen. Petroleum geologists have paid more and more attention to the study of kerogen, and have conducted in-depth discussions on the geochemical, structural and petrological characteristics of kerogen. However, almost all of these studies and tests rely on kerogen purity. Especially in the study of kerogen geochemistry, it is required to ...
Claims
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IPC IPC(8): G01N23/207G01N23/2251G01N23/2202G01N23/20008
CPCG01N1/286G01N1/34G01N23/20G01N23/2251
Inventor张水昌林鹏王华建王晓梅林可心苏劲
OwnerPETROCHINA CO LTD