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Method for judging the age of petroleum source rocks by comparing evaporites with petroleum sulfur isotopes

A sulfur isotope and evaporite technology, applied in the field of sulfur isotope stratigraphy research, can solve the problems of difficult determination of the exact time of the sulfur isotope curve, scarce data, and difficult deposition of evaporites

Active Publication Date: 2021-11-09
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] However, evaporite formations usually lack fossils, and it is difficult to determine the age of evaporite deposits through biostratigraphy, and it is also difficult to perform radioisotope dating on evaporite formations. Therefore, the exact time of the sulfur isotope curve is not easy to determine. The previous international sulfur The isotope curve can only reflect a rough time range
In addition, because the evaporite mineral gypsum has limited geological records and is easily dissolved in the surface environment, the samples for sulfur isotope analysis mainly come from drilling cores, so the data are very scarce

Method used

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  • Method for judging the age of petroleum source rocks by comparing evaporites with petroleum sulfur isotopes
  • Method for judging the age of petroleum source rocks by comparing evaporites with petroleum sulfur isotopes

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Embodiment 1

[0033] Applying the method of the present invention, the gypsum in the early and middle stages of the Cambrian period in Well Zhongshen-5 in the Tarim Basin was analyzed, and preliminary data were obtained. The method specifically includes:

[0034] Determination of the geological age of the Cambrian in the Tarim Basin: in the surface outcrops, it is determined by the comparison of fossils (such as trilobites, small shell fossils, suspicious sources, etc.) , combined with carbon isotope stratigraphy of carbonate strata to carry out stratigraphic division and correlation. By analyzing the geological maps, stratigraphic histograms and well logging data of the Tarim Basin, the location and depth of wells containing sulfate samples in various geological ages were determined, and the sampling plan was established. Collect gypsum and carbonate rock samples from the sampling wells according to the prepared sampling depth table, and number the samples in sequence according to the dri...

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Abstract

The invention discloses a method for judging the age of petroleum source rocks by comparing evaporite and petroleum sulfur isotopes, comprising the following steps: S101, collecting sulfate samples in evaporite strata and performing sulfur isotope analysis to obtain the sulfur isotope of evaporite strata Data; S102. Collect carbon isotope samples in carbonate strata interbedded with evaporite strata and conduct carbon and oxygen isotope analysis, and then conduct carbon isotope stratigraphic studies to determine the geological age of evaporites; S103. Based on evaporation Sulfur isotope data of rock formations and the geological age of evaporite rocks to improve the international sulfur isotope curve; S104. Analyze sulfur isotope in oil and obtain sulfur isotope data of oil; S105. Combine sulfur isotope data of oil with sulfur isotope data of evaporite formations For comparison, and combined with the international sulfur isotope curve to determine the geological age of petroleum source rocks.

Description

technical field [0001] The invention belongs to the technical field of sulfur isotope stratigraphy research, in particular to a method for judging the age of petroleum source rocks by comparing evaporites and petroleum sulfur isotopes. Background technique [0002] The late Neoproterozoic to early Cambrian was a critical period in the evolution of the earth's history, and the entire biosphere, atmosphere, and hydrosphere underwent tremendous changes. The carbon and sulfur isotopic compositions of seawater also changed significantly, with carbon isotopes recorded in carbonate deposits and sulfur isotopes recorded in sulfate deposits. [0003] Under biological action, the sulfur cycle in the ocean can produce quite obvious fractionation of sulfur isotopes. Sulfate-reducing bacteria can cause delta in sulfate 34 S enrichment, and δ in sulfide 34 S depletion, this biofractionation, controls fluctuations in sulfur isotopes in marine sediments. In the early and middle Cambrian...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 张智礼孟凡巍李慧莉杨伟利
Owner CHINA PETROLEUM & CHEM CORP
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