A method for quantitatively identifying the source of organic matter in source rocks based on the ratio of n-alkane C22+/C21-
A technology for C21- and normal alkanes, applied in the measurement of scattering characteristics, etc., can solve the problems that cannot meet the needs of the research on the enrichment mechanism of organic matter in source rocks, and achieve the effect of wide applicability
Active Publication Date: 2022-04-12
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology
Conventional geochemical methods can only qualitatively evaluate the contribution of source rock organic matter from terrestrial higher plants and lower aquatic organisms, but cannot meet the needs of research on the mechanism of organic matter enrichment in source rocks during oil and gas exploration.
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[0045] The experimental methods used in the following examples are conventional methods unless otherwise specified.
[0046] The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.
[0047] The embodiment of the present invention provides a method for evaluating the source of organic matter in source rocks by using the distribution characteristics of normal alkanes. The process is as follows figure 1 shown, including the following steps:
[0048] Step 101: According to the difference in the distribution of n-alkanes in the source rocks derived from organic matter derived from higher plants and source rocks derived from organic matter derived from lower aquatic organisms, establish a calculation model for the proportion of source rock organic matters;
[0049] Step 102: According to the experimental data of coal and Precambrian mudstone samples, respectively fit the source rock Ro (%) and the extract C 22 +...
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The invention discloses a method based on normal alkanes C 22 + / C 21 ‑Ratio is a method for quantitatively identifying the source of organic matter in source rocks. The method comprises the following steps: according to the difference in the distribution of normal alkanes in the extracts of source rocks derived from higher plant organic matter and source rocks derived from lower aquatic organic matter, a calculation model for the proportion of source rock organic matter sources is established; Calculation model for source rock organic matter source ratio, setting the organic matter source ratio, and obtaining multiple groups of specific ratios, Ro (%) and C 22 + / C 21 ‑Ratio relationship, and then draw the quantitative identification chart of the source of organic matter. The present invention starts from source rock C 22 + / C 22 Starting from the ‑ratio, using the coal samples from the Ordos Basin and the Junggar Basin and the Precambrian mudstone in the northern Hebei and Liaoxi regions as two end members, a method for quantitatively identifying the contribution ratio of terrigenous higher plants and lower aquatic organisms as the source of organic matter in source rocks was established . The invention provides a feasible technical method for the research on the enrichment of organic matter in source rocks, can realize the quantitative identification of the source of organic matter in source rocks, and has wide applicability.
Description
technical field [0001] The present invention relates to a kind of based on normal alkane C 22 + / C 21 - The method for quantitatively identifying the source of organic matter in source rocks by ratio belongs to the technical field of source rock evaluation. Background technique [0002] Source rocks have different sources of organic matter, and their hydrocarbon-generating potential and geochemical characteristics of generating oil and gas will vary greatly. Conventional geochemical methods can only qualitatively evaluate the contribution of terrestrial higher plants and lower aquatic organisms from source rock organic matter, but cannot meet the needs of research on the enrichment mechanism of source rock organic matter in the process of oil and gas exploration. Therefore, there is an urgent need for a method to quantitatively calculate the proportion of organic matter in source rocks contributed by terrestrial higher plants and lower aquatic organisms. [0003] N-alkanes...
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IPC IPC(8): G01N21/55
CPCG01N21/55
Inventor 卢晓林李美俊冉子超肖洪罗情勇杨永才王丽朱志立曾棒
Owner CHINA UNIV OF PETROLEUM (BEIJING)