CN107167400B - Method for detecting crude oil density in petroleum inclusion - Google Patents
Method for detecting crude oil density in petroleum inclusion Download PDFInfo
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- CN107167400B CN107167400B CN201710302473.0A CN201710302473A CN107167400B CN 107167400 B CN107167400 B CN 107167400B CN 201710302473 A CN201710302473 A CN 201710302473A CN 107167400 B CN107167400 B CN 107167400B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/24—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing the transmission of wave or particle radiation through the material
Abstract
The invention provides a method for detecting crude oil density in a petroleum inclusion, which comprises the following steps: 1) sample preparation: 2) selecting a sample: 3) spectral scanning of a known density standard sample: 4) and (3) establishing a fitting equation: 5) petroleum inclusion spectrum acquisition: 6) calculating the crude oil density of the petroleum inclusion: establishing a fitting equation 4) through the density and the spectrum peak area value according to the spectrum peak area value obtained in the step 3), and substituting the spectrum peak area value obtained in the step 5) into the equation 4) to obtain the crude oil density value of the petroleum inclusion. The invention utilizes the effective detection method that the laser confocal can collect the spectral information of the 0.41um micro-area to observe and analyze the sandstone sample, and analyzes the crude oil density in the petroleum inclusion on the premise of keeping the real rock structure.
Description
Technical Field
The invention relates to a method for detecting the density of crude oil in a petroleum inclusion captured in a rock formation process in an oil field exploration and development process.
Background
The organic inclusion component represents the property of the ancient fluid, is not changed due to various secondary effects in the later period, and has important significance for the research of oil and gas sources, oil and gas migration, oil and gas filling and secondary change after the oil and gas filling and the preservation. On the premise of the current international energy shortage, the pressure and the temperature of a stratum during the crude oil capturing period are recovered through a petroleum inclusion, and further the research on the migration direction of crude oil and the properties of crude oil is an important direction for the storage capacity of the mining and submerging crude oil. It is very important to analyze the density of the crude oil in the inclusion. In the past, density analyzers were used, but the samples were crushed and re-extracted, requiring large volumes of inclusions to be collected because the volume of the inclusions was tiny, only a few microns in diameter.
Disclosure of Invention
The invention aims to provide a method for in-situ detection of the crude oil density in a petroleum inclusion in sandstone by using laser confocal technology, which is a method for observing and analyzing a sandstone sample by using an effective detection method that the laser confocal technology can acquire 0.41um micro-area spectral information and analyzing the crude oil density in the petroleum inclusion on the premise of keeping a real rock structure.
The method for analyzing the crude oil density by laser confocal analysis is based on a core polished section, and comprises a full-wave-band fluorescence microscope technology, a laser confocal microscope spectrum scanning technology and a cold-hot platform technology.
The technical problem solved by the invention is realized by adopting the following technical scheme: the method for detecting the crude oil density in the petroleum inclusion comprises the following steps:
1) sample preparation: preparing a double-sided polishing sheet with the thickness of 0.5-1mm according to different sample loosening degrees;
2) selecting a sample: placing a sample on a cold and hot object stage, adjusting a lens of a laser scanning confocal microscope to be above an observed sample, selecting a fluorescent light source to irradiate the sample, observing by using a long-focus objective lens and an objective lens, and finding out a proper inclusion sample;
3) sample spectral scanning: adjusting the temperature of a sample through a cold and hot table, starting scanning when uniform temperature is reached, collecting the spectrum of the sample, selecting laser with 488nm wavelength as an excitation light source, scanning the inclusion sample, selecting an XY lambda scanning mode, receiving a characteristic spectrum data volume in the range of 400nm-800nm, and storing;
4) and (3) establishing a fitting equation: taking 30 standard crude oil samples with known density, selecting 488nm laser as an excitation light source, scanning the standard samples respectively, selecting an XY lambda scanning mode, receiving a characteristic spectrum data body in a range of 400nm-800nm, storing the characteristic spectrum data body respectively, and establishing a fitting equation through two parameters of crude oil density and spectrum peak area;
5) crude oil density analysis of petroleum inclusion: and (4) substituting the spectral peak area value obtained in the step 3) into the fitting equation established in the step 4) to obtain the crude oil density value of the petroleum inclusion.
The objective lens in the scheme adopts a 5-63 times long-focus lens; and adjusting the temperature of the sample by a cold and hot table, wherein the temperature of the sample is 20-90 ℃.
The invention has the beneficial effects that: in the research of the petroleum inclusion, the inclusion has small volume, the method is obtained by detection under the condition of keeping the original structure of the sandstone without damaging the original structure of the sandstone, and the obtained density data represents the properties of the ancient fluid, so that the method has important significance for the research of oil gas sources, oil gas migration, oil gas filling and secondary change after reservoir formation. The method can quickly and accurately analyze the density of the crude oil in the petroleum inclusion in the sample, and is real and accurate.
Drawings
FIG. 1 is a spectral plot of a standard crude oil sample;
FIG. 2 is an equation diagram of the corresponding relationship between the peak area of the crude oil spectrum and the crude oil density;
FIG. 3 is a fluorescent photograph of zincblende samples;
FIG. 4 is a spectrum of the inner ring of the sample;
FIG. 5 is an outer ring spectrum of the sample;
FIG. 6 is a laser confocal scanning three-dimensional reconstruction diagram of a crude oil inclusion.
Detailed Description
The invention is further described below in connection with experiments:
the experimental sample is from the golden top area, and the detection instrument: leica SP5II, the camera lens adopts 63 times long focus camera lens, the confocal digital magnification is 28 times, the resolution is 1024X1024, the acquisition frequency is 400HZ, the acquisition condition Live average is 16 times of average noise removal, Accu8 times of signal superposition, the temperature condition is detected: at room temperature.
The method for detecting the crude oil density in the petroleum inclusion comprises the following steps:
1) sample preparation: preparing an experimental sample into a double-sided polishing sheet with the thickness of 1 mm;
2) selecting a sample: placing a sample on a cold and hot object stage, adjusting a lens of a laser scanning confocal microscope to be above an observed sample, selecting a fluorescent light source to irradiate the sample, and using a long-focus objective lens which is a 63-time long-focus lens; observing by using an objective lens to find a proper inclusion sample;
3) and (3) establishing a fitting equation: scanning a crude oil sample with the density of 28 from 0.75 to 0.96, selecting laser with the wavelength of 488nm as an excitation light source, respectively scanning the standard sample, selecting an XY lambda scanning mode, receiving a characteristic spectrum data body in the range of 400nm to 800nm as shown in figure 1, respectively storing, and establishing a corresponding relation between a spectrum peak area and the crude oil density as shown in Table 1. Establishing a fitting equation through two parameters of crude oil density and spectrum peak area; see fig. 2. Y-8E-09X 2+4E-05X + 0.6781Y-inclusion density X-inclusion spectral peak.
4) Sample spectral scanning: the samples were taken fluorography, as shown in FIG. 3. As can be seen by the fluorescent color, the inner ring inclusion fluoresced bright yellow (indicated by green arrows), and the zinc blende inter-granular outer ring inclusion fluoresced apricot yellow (indicated by red arrows). And (3) collecting the spectrum of the sample at room temperature, selecting the laser with the wavelength of 488nm as an excitation light source, wherein the 488nm laser is suitable for crude oil with all densities and can excite a complete spectrum, and other excitation light sources cannot. Scanning the inclusion sample, selecting an XY lambda scanning mode, receiving a characteristic spectrum data volume in the range of 400nm-800nm, and storing; as shown in fig. 4 and 5.
5) Crude oil density analysis of petroleum inclusion: and (3) substituting the spectral peak area value obtained in the step 4) into the fitting equation established in the step 3) to obtain the crude oil density value of the petroleum inclusion. And acquiring an X value by acquiring a spectrum, and substituting an equation to obtain a Y value. The crude oil density of the inner ring inclusion was calculated to be 0.788, the crude oil density of the outer ring inclusion was calculated to be 0.721, and by confocal laser scanning and three-dimensional reconstruction, blue was the distribution range of the crude oil inclusion having a density of 0.788, and red was the distribution range of the crude oil inclusion having a density of 0.721, as shown in fig. 6.
TABLE 1 Table of corresponding relationship between spectral peak area and crude oil density
Claims (1)
1. A method for detecting the density of crude oil in an oil inclusion comprises the following steps:
1) sample preparation: preparing a double-sided polishing sheet with the thickness of 0.5-1mm according to different sample loosening degrees;
2) selecting a sample: placing a sample on a cold and hot object stage, adjusting a lens of a laser scanning confocal microscope to be above an observed sample, selecting a fluorescent light source to irradiate the sample, observing by using a long-focus objective lens and an objective lens, and finding out a proper inclusion sample;
3) sample spectral scanning: adjusting the temperature of a sample through a cold and hot table, starting scanning when uniform temperature is reached, collecting the spectrum of the sample, selecting laser with 488nm wavelength as an excitation light source, scanning the inclusion sample, selecting an XY lambda scanning mode, receiving a characteristic spectrum data volume in the range of 400nm-800nm, and storing;
4) and (3) establishing a fitting equation: taking 30 standard crude oil samples with known density, selecting 488nm laser as an excitation light source, scanning the standard samples respectively, selecting an XY lambda scanning mode, receiving a characteristic spectrum data body in a 400nm-800nm range, storing the characteristic spectrum data body respectively, establishing a corresponding relation between a spectrum peak area and the crude oil density, and establishing a fitting equation through two parameters of the crude oil density and the spectrum peak area; the equation is Y = 8E-09X2+4E-05X +0.6781Y = density of inclusion X = inclusion spectral peak;
5) crude oil density analysis of petroleum inclusion: substituting the spectral peak area value obtained in the step 3) into the fitting equation established in the step 4) to obtain the crude oil density value of the petroleum inclusion;
the objective lens adopts a 5-63 times long-focus lens, and the temperature of the sample is adjusted by a cold and hot platform, wherein the temperature of the sample is 20-90 ℃.
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