Method of determining ripened oil-source rocks

FIELD: oil and gas production.

SUBSTANCE: aim of invention is estimating expectations for oil and gas of oil-source rock areas. For that aim, sampled rock is treated to isolate organic substance soluble in organic solvents, after which organic substance is chromatographed to detect 4-methyldibenzothiophene and 1-methyldibenzothiophene. When ratio of 4- to 1-isomer exceeds 0.9 rock is regarded as ripened.

EFFECT: increased determination reliability and rapidity.

2 tbl


The invention relates to Geology, including search Geochemistry of oil, and can be used to assess the potential areas of the source rocks for oil and gas.

When carrying out exploration for oil and gas is an important step detection in the context of potential source rocks and knowledge, did the source rock maturity necessary to start the generation of oil in quantities sufficient for the formation of commercial accumulations of oil.

There are various ways to determine the maturity of the source rocks.

There is a method of determining a Mature source rocks on the results of the pyrolysis of source rocks in an inert atmosphere (Yee b, Welt D. the Formation and distribution of oil and gas. M.: Mir, 1981, 501 S.). This method gives only an approximate estimate.

The known method based on the definition of the detailed composition of substances, namely the analysis of the correlation of various light gasoline fraction hydrocarbons (Tissot B., Welt D. the Formation and distribution of oil and gas. M.: Mir, 1981, 501 S.). The disadvantage of this method is the absence of light hydrocarbons in the core due to the loss during storage.

The known method based on the definition of normal and isoprenoid alkanes (Yee b, Welt D. Education and rasprostraniteli and gas. M.: Mir, 1981, 501 S.). The method is simple in execution. The disadvantages include a large impact on the amount of characteristics of the lithological composition of the rocks, extracts from the same source rocks show different maturity.

The known method, based on the definition of even and odd n-alkanes (J. hunt. Geochemistry and Geology of oil and gas. M.: Mir, 1982, 703 S.). The method is simple in execution, but the downside of it is the essential dependence of the composition of alkanes from type netamerica organic matter.

Closest to the patent is a method of determining catagenesis of organic matter source strata, including the sampling of sedimentary rocks, the selection of these insoluble organic matter, production of transparent dustgenerating ugleperegruzhatelja scratch its microscopic study in transmitted and reflected light to determine the reflectivity of the micro-components, the catagenesis of organic matter is measured by measuring the reflectivity of carbonclimate in air (Ra), when the indicator reflectance Ra in the range from 52 to 61 fixed area of your home mesications, in the interval of values from 61 to 64 is fixed to the middle mesications, in the range of Ra values from 64 to 70 zone deep metacat the Genesis (patent RU No. 2085974, G 01 V 8/00, 9/00). This method does not take into account the effect on the reflectivity of the conditions of formation of carbonclimate, which is the product of the conversion of various residues planktonogenic organic matter and the presence of terrigenous component. This introduces an error in the determination of the reflectivity and reduces the reliability of the determination of Mature source rocks, organic matter which has started to generate oil in quantities sufficient for the formation of deposits. It is impossible to determine the influence of lithological composition of rocks on the change in reflectivity of carbonclimate in the section of the source rocks. This method does not allow to compare the maturity of oils and netmetering rocks due to the lack of carbonclimate in the oils. The method is labor-intensive and relatively long (10-15 days). Insoluble organic matter derived from the species by its processing of aggressive and harmful substances, such as hydrochloric and hydrofluoric acid that binds to comply with strict safety measures and use of special equipment.

The invention is not complicated in execution, and informative method for determining Mature source rocks.

The technical result of izopet the tion translates into increased reliability and expressnet definition of Mature source rocks.

The technical result is achieved in that in the method of determining a Mature source rocks, including the selection of the breed, highlighting organic matter and its analysis, according to the invention separated from the breed soluble in organic solvents organic matter, chromatographic him and detects 4-methyldibenzothiophene (MDBT) and 1-methyldibenzothiophene (MDBT), and when the value of the ratio MDBT/MDBT >0,9 oil source rocks is considered Mature.

Soluble in organic solvents organic substance obtained by extraction of polar organic solvent (most common - chloroform, the mixture of alcohol and benzene), passed through the chromatograph. During the process of chromatography conduct detection eluruumid from the column components. For this you can use different types of detectors that are sensitive to hydrocarbon or sulfur-containing components (depending on equipment design chromatograph). The most convenient detectors in defining methyldibenzothiophenes are mass-selective and photometric because there is no obligation to allocate serveroptions concentrate of the extract. If you are using such detectors, as katharometer or flame ionization, before chromatographic analysis of the needs of the ISS is ebimage extract select servermachine concentrate for subsequent analysis.

Attitude MDBT/MDBT is determined by the ratio of the peak areas corresponding 4-methyldibenzothiophene and 1-methyldibenzothiophene on mass fragmentogram or chromatogram (depending on the type of detector). About the maturity of the source rock are judged by the content of 4-methyldibenzothiophene to the content of 1-methyldibenzothiophene (MDBT/MDBT)determined from the results of chromatographic analysis of the extracts of the species, the breed is considered Mature if it is a ratio greater than 0,9, because the parameter values MDBT/MDBT defined for the oil, greater than this value. In the evaporator chromatograph set temperature 330-350°s is the initial temperature of thermostat capillary column chromatograph 45-70°and the final temperature 279-310°to ensure separation of the designated substances and serial output of all components of the mixture from the column.

An example of the performance of the proposed method.

To determine the maturity of the source rocks of Western Siberia, the Bazhenov Suite, was selected collection of core material rocks of the Bazhenov formation. The collection of core material included area, different depth of the Bazhenov formation, reservoir temperature, which is the leading factor in maturity.

Selected samples of core material osado the different breeds are subjected to mechanical crushing and abrasion to the size of the grains less than 0.5 mm, next cartridge from the filter paper filled with crushed rock placed in the to conventional Soxhlet extractions, which carried out the extraction of organic substances from the rock by means of chloroform. The end of the extraction is controlled by changing the solvent in the extraction flask, if a fresh portion of solvent after 10-12 hours of extraction becomes weak compared to the initial color, the operation is finished.

After distillation of the solvent conduct / mass spectrometric analysis of the obtained extracts.

In the analysis of use / mass spectrometer Hewlett Packard 6890/5973, equipped with a mass selective detector (MSD), and use the software ChemStation system for collection and processing of analysis results.

Use of capillary column type HP-l-MS (30 m ×0,25 mm); phase - 100% dimethylpolysiloxane. Microspace sample in the amount of 0.2 Ál injected into the evaporator / mass spectrometer, in which the temperature to 350°C. Simultaneously through the evaporator purge carrier gas, helium with a speed of 0.7 ml/min of the Analyzed mixture is sent to the capillary column chromatograph, in which the pre with thermostat, set the starting column temperature 45°C. analysis Time at this temperature is 3 minutes by Setting the speed increase (programming) temperature the tours 3° C/min, bring the temperature of thermostat column to 310°C. the Time of incubation at this temperature for 30 minutes

After capillary column chromatograph components of the analyzed mixture is sent to mass-selective detector. Identification of peaks 4-methyl - 1-methyldibenzothiophene was carried out by building mass fragmentogram on 198 mass corresponding to the characteristic ion for methylseleninic of dibenzothiophene and further mapping of the spectrogram are interested in substance with the spectrogram read from the library.

According to the results / mass spectrometric analysis of the relationship of the various components, depending on the level of maturity of the source rocks, such as MDBT/MDBT and Ki (isoprenoid ratio). Parameter MDBT/MDBT measured with great accuracy and the least dependent on the lithological composition of the rocks and the type of the original organic matter, and isoprenoid ratio, is a common and easily identifiable parameter maturity of organic matter, however, strongly depends on the lithology of the rocks. It is determined by the content of isoprenoid hydrocarbons piers and phytane to the content of alkanes normal structure of h17H36and n-C18H38.

Materials explaining the essence of the invention shown in the tables is x:

Table 1. The parameters of the maturity of the rocks of the Bazhenov formation, defined in various ways.

Table 2. Parameter values MDBT/MDBT for oils, genetically related rocks of the Bazhenov formation

Table 1 shows the results of determining the maturity of the main source rocks of Western Siberia - the Bazhenov formation using different methods. Mapping / mass spectrometric data for the same samples was carried out to identify the level of maturity on the reflectance of vitrinite coals (Ro) and the temperature of maximum release of hydrocarbons (Tmax) during pyrolysis of the studied rock samples in an inert atmosphere.

From table 1 it is evident that increasing the reflectivity of vitrinite (Ro) is an increase in Tmax and the ratio between the content of 4-methyl - 1-methyldibenzothiophene (MDBT/MDBT). The value of Ki decreases. The value of Ki changes substantially along the section of the source retinue of the same well, although in the ideal case, the parameter value maturity should remain constant. Fluctuations Ki section due to a change in the lithological composition of the rocks.

The dispersion of the quantity values MDBT/MDBT in the section of the source rocks formations of one well significantly less, therefore, the accuracy of this parameter above. Because value is MDBT/MDBT measured with greater accuracy and less dependent on lithology and type of organic matter and is determined only by thermodynamics isomerization transition less thermodynamically stable 1-methyl-isomer in the more stable 4-methyl-isomer, it better defines the threshold of maturity (the beginning of mass production of oil source rocks. The minimum value MDBT/MDBT in which the breed of the Bazhenov formation is Mature, should be considered the minimum value of this parameter, defined in the oil of this region, genetically related rocks of the Bazhenov formation (table 2). Table 2 shows that there is no oil parameter value from MDBT/MDBT is less than 0.9. Therefore, when the value of the parameter MDBT/MDBT>0.9 breed Bazhenov formation is Mature, because it started to generate oil in quantities sufficient for the formation of industrial deposits.

Conclusion: based on the data of this table rock Bazhenov formation Face, Glukhovsky and Kozyrski space is Mature, and on the other, she began to produce oil in quantities sufficient for the formation of oil deposits.

Conclusion: the table shows that the value of the parameter MDBT/MDBT for oils, genetically related to the Bazhenov Suite, more 0,9 therefore, if the value of this parameter for extracts from the source rock more 0,9 breed can be considered Mature, i.e. capable of generating oil is in quantities sufficient for the formation of industrial deposits.

Thus, the proposed method of determining a Mature source rocks can improve the speed and reliability of their identification, which is important for the evaluation of petroleum potential of the territories, and to determine the source of generation of oil.

The method of definition of Mature source rocks, including breed selection, separation of organic substances from the breed and its analysis, characterized in that secrete soluble in organic solvents organic matter of rocks, chromatographic and detects 4-methyldibenzothiophene (MDBT) and 1-methyldibenzothiophene (MDBT), when the value of the ratio MDBT/MDBT>0,9 oil source rocks is considered Mature.


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