CN116008028A - Shale oil content parameter S 1 Light hydrocarbon compensation correction method - Google Patents
Shale oil content parameter S 1 Light hydrocarbon compensation correction method Download PDFInfo
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Abstract
The application relates to the field of oil and gas exploration and discloses a shale oil content parameter S 1 The light hydrocarbon compensation and correction method comprises the following steps: respectively carrying out on-line pyrolysis on the simulated shale sample and the underground shale sample with corresponding maturity in the natural evolution section; quantitatively analyzing hydrocarbon components of pyrolysis products of the simulated shale sample and the underground shale sample; respectively obtaining the proportion of light hydrocarbons in total hydrocarbons of the simulated shale sample and the underground shale sample from quantitative analysis results; according to the proportion of light hydrocarbon in the total hydrocarbon of the simulated shale sample and the underground shale sampleAs a result of the comparison, the oil content parameter S of the downhole shale sample 1 And (5) compensating and correcting the light hydrocarbon. Therefore, the accuracy of recovery of the light hydrocarbon loss of the shale sample is remarkably improved, the experimental cost is effectively reduced, the time period is shortened, and the method is convenient for large-scale application on the basis of original data.
Description
Technical Field
The invention relates to the field of oil and gas exploration, in particular to a shale oil content parameter S 1 A light hydrocarbon compensation correction method.
Background
Shale oil is a significant component of unconventional energy sources and is of great interest due to its great potential for resources. As an important link of oil and gas exploration, shale oiliness evaluation is a foundation for predicting a shale oil dessert segment and a dessert region, and is also a core for evaluating shale oil resource potential.
The rock pyrolysis method has the advantages of simple operation, large information content of detection results and low cost, and becomes one of main research methods for representing the oiliness of shale, and the common parameter S 1 The free hydrocarbon content in the shale retentate hydrocarbon is characterized and used for reflecting the oil content of the shale. S is S 1 Is a part of petroleum hydrocarbon in shale oil, and is mainly hydrocarbon compounds volatilized when rock is heated to not more than 300 ℃. However, S in the shale sample to be detected can be caused in the process of reaching the ground from the bottom of the well, in the process of placing the core in the core warehouse, in the process of crushing the sample before the experiment and the like 1 Loss of light hydrocarbons, with loss rates as high as 30% -50%, results in measured values lower than actual values of the subsurface samples.
At present, the scholars at home and abroad are about S 1 The light hydrocarbon recovery is mainly studied by comparing pyrolysis results of oil-bearing rock samples after being placed for different times, comparing pyrolysis results of fresh frozen samples or closed core samples after being placed for different times and the like. However, the loss of light free hydrocarbons is a continuous process, and the laboratory measured free hydrocarbon content varies greatly with the time of sample placement of the shale core. By comparing the pyrolysis results of samples with different standing times to S 1 The method for compensating and correcting is long in time consumption and poor in operability, and light hydrocarbon loss in the process of simulating the shale sample rising from the bottom of the well to the surface cannot be recovered. Although the accuracy can be improved by the airtight coring method, the method is high in price and difficult to popularize on a large scale. In addition, the light hydrocarbon recovery results established by comparing the pyrolysis data of the fresh sample with the sample after being placed for different times cannot accurately reflect the sampleThe original oil-containing information of the product, and the light hydrocarbon recovery result established by comparing the pyrolysis data of the sealed core sample and the sample after being placed for different time cannot be widely popularized and applied.
Disclosure of Invention
Accordingly, the present invention aims to provide a shale oil content parameter S 1 The light hydrocarbon compensation correction method can obviously improve the accuracy of recovery of the light hydrocarbon loss of the shale sample. The specific scheme is as follows:
shale oil content parameter S 1 The light hydrocarbon compensation and correction method comprises the following steps:
respectively carrying out on-line pyrolysis on the simulated shale sample and the underground shale sample with corresponding maturity in the natural evolution section;
quantitatively analyzing hydrocarbon components of pyrolysis products of the simulated shale sample and the downhole shale sample;
respectively obtaining the proportion of light hydrocarbons in the total hydrocarbons of the simulated shale sample and the underground shale sample from quantitative analysis results;
according to the comparison result of the proportion of light hydrocarbons in the total hydrocarbons of the simulated shale sample and the underground shale sample, the oil content parameter S of the underground shale sample is calculated 1 And (5) compensating and correcting the light hydrocarbon.
Preferably, the shale oil content parameter S provided in the embodiment of the invention 1 In the light hydrocarbon compensation correction method, the oil content parameter S of the underground shale sample 1 After compensating and correcting the light hydrocarbon, the method further comprises the following steps:
establishing a light hydrocarbon compensation plate corresponding to the underground shale samples with a plurality of maturity;
and obtaining compensation coefficients corresponding to the shale samples with other maturity according to the shale sample light hydrocarbon compensation plate, and carrying out compensation correction of light hydrocarbons.
Preferably, the shale oil content parameter S provided in the embodiment of the invention 1 In the light hydrocarbon compensation correction method, downhole mud pages with corresponding maturity in simulated shale samples and natural evolution profiles respectivelyPrior to the on-line pyrolysis of the rock sample, further comprising:
pyrolyzing a coal sample with low maturity in a field geological section or a mine, measuring the reflectivities of the vitrinite corresponding to different temperature points, and calibrating the maturity corresponding to different temperature points;
the downhole shale sample is selected having a maturity corresponding to the specular mass reflectivity.
Preferably, the shale oil content parameter S provided in the embodiment of the invention 1 The light hydrocarbon compensation correction method comprises the following steps of:
setting a target temperature of the downhole shale sample to a first constant value;
setting the target temperature of the simulated shale sample as different temperature points measured by the coal sample; the target temperatures of the simulated shale samples are different, and the heating rates are different.
Preferably, the shale oil content parameter S provided in the embodiment of the invention 1 In the light hydrocarbon compensation correction method, on-line pyrolysis is respectively carried out on the simulated shale sample and the underground shale sample with corresponding maturity in the natural evolution section, and the method comprises the following steps:
and respectively carrying out on-line pyrolysis on the simulated shale sample and the underground shale sample with corresponding maturity in the natural evolution profile by adopting a thermal cracking instrument.
Preferably, the shale oil content parameter S provided in the embodiment of the invention 1 In the light hydrocarbon compensation correction method, the quantitative analysis of hydrocarbon components is carried out on pyrolysis products of the simulated shale sample and the underground shale sample, and the method comprises the following steps:
and quantitatively analyzing hydrocarbon components of pyrolysis products of the simulated shale sample and the underground shale sample by adopting a gas chromatograph-mass spectrometer.
Preferably, the shale oil content parameter S provided in the embodiment of the invention 1 The light hydrocarbon compensation correction method further comprises the following steps before the on-line pyrolysis:
and setting the temperature of a transmission connecting line between the thermal cracking instrument and the gas chromatography-mass spectrometer to be a second constant value.
Preferably, the shale oil content parameter S provided in the embodiment of the invention 1 The light hydrocarbon compensation correction method comprises the following steps of:
after the underground shale sample and the simulated shale sample reach the corresponding target temperatures and are kept at constant temperature for a set period of time, enriching the pyrolysis products by utilizing a liquid nitrogen thermos cup placed at the front end of the chromatographic column;
after the pyrolysis product enrichment is completed, the pyrolysis product is transmitted to the gas chromatography-mass spectrometer through the chromatographic column for quantitative analysis of hydrocarbon components.
Preferably, the shale oil content parameter S provided in the embodiment of the invention 1 In the light hydrocarbon compensation correction method, before selecting the downhole shale sample with the maturity corresponding to the specular reflectivity, the method further comprises:
and determining the maturity of the underground shale sample according to the depth of the geological shale sample.
From the technical scheme, the shale oil content parameter S provided by the invention 1 The light hydrocarbon compensation and correction method comprises the following steps: respectively carrying out on-line pyrolysis on the simulated shale sample and the underground shale sample with corresponding maturity in the natural evolution section; quantitatively analyzing hydrocarbon components of pyrolysis products of the simulated shale sample and the underground shale sample; respectively obtaining the proportion of light hydrocarbons in total hydrocarbons of the simulated shale sample and the underground shale sample from quantitative analysis results; according to the comparison result of the proportion of light hydrocarbon in the total hydrocarbon of the simulated shale sample and the underground shale sample, the oil content parameter S of the underground shale sample is calculated 1 And (5) compensating and correcting the light hydrocarbon.
The shale oil content parameter S provided by the invention 1 The light hydrocarbon compensation correction method adopts an online pyrolysis and product detection method, and the underground mud page with corresponding maturity in the shale sample and the natural evolution profile is simulated by comparisonThe proportion of the light hydrocarbons in the total hydrocarbons of the rock sample is compensated and corrected for the light hydrocarbons of the simulated shale samples with different maturity, so that the accuracy of recovery of the light hydrocarbon loss of the shale samples is remarkably improved, the experimental cost is effectively reduced, the time period is shortened, and the method is convenient for large-scale application on the basis of original data.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical descriptions will be briefly described, and it is apparent that the drawings in the following description are only embodiments of the present invention, and other drawings may be obtained according to the provided drawings without inventive effort for those skilled in the art.
FIG. 1 shows shale oil content parameter S provided by the embodiment of the invention 1 A flow chart of a light hydrocarbon compensation correction method;
fig. 2 is a schematic diagram of a thermal simulation experiment of a shale sample according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the distribution of the normal paraffin missing part, the residual part and the unreleased part in the pyrolysis products of the simulated shale sample and the downhole shale sample provided by the embodiment of the invention;
FIGS. 4a to 4f are respectively gas chromatograms of normal paraffins in pyrolysis products of a 7-section long simulated shale sample TNH-15 of the Huidoss basin provided by the embodiment of the invention under different pyrolysis temperature conditions;
FIGS. 5a to 5f are respectively n-alkane gas chromatograms of pyrolysis products of a portion of a 7-section downhole shale sample with different maturity in a Huddos basin provided by an embodiment of the present invention;
fig. 6 is a light hydrocarbon compensation plate for 7-section shale with a erdos basin length, provided by an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a shale oil content parameter S 1 The light hydrocarbon compensation correction method, as shown in fig. 1, comprises the following steps:
s101, performing on-line pyrolysis on the simulated shale sample and the underground shale sample with corresponding maturity in the natural evolution profile.
The downhole shale sample is a drilling geological shale sample.
In a specific implementation, step S101 performs on-line pyrolysis on the simulated shale sample and the downhole shale sample with corresponding maturity in the natural evolution profile, which may specifically include: and respectively carrying out on-line pyrolysis on the simulated shale sample and the underground shale sample with corresponding maturity in the natural evolution profile by adopting a thermal cracking instrument. The thermal cracking instrument herein may be replaced with other closed system thermal simulation devices.
Preferably, the simulated shale sample is a low maturity sample, which should have a vitrinite reflectance (Ro) of less than 0.7%.
S102, carrying out quantitative analysis on hydrocarbon components on pyrolysis products of the simulated shale sample and the underground shale sample.
In particular embodiments, step S102 performs a quantitative analysis of hydrocarbon components on pyrolysis products of simulated shale samples and downhole shale samples, which may include: and quantitatively analyzing hydrocarbon components of pyrolysis products of the simulated shale sample and the geological shale sample by adopting a gas chromatograph-mass spectrometer. The gas chromatograph-mass spectrometer may be used for quantitative analysis of hydrocarbon components only by using the gas chromatograph. In the invention, quantitative analysis results are obtained by an online pyrolysis and product detection method based on a pyrolysis-gas chromatography-mass spectrometry combined technology.
S103, respectively obtaining the proportion of light hydrocarbons in the total hydrocarbons of the simulated shale sample and the underground shale sample from the quantitative analysis result.
S104, according to a comparison result of the proportion of light hydrocarbons in the simulated shale sample and the total hydrocarbons in the underground shale sample, the oil content parameter S of the underground shale sample is calculated 1 And (5) compensating and correcting the light hydrocarbon.
The shale oil content parameter S provided by the embodiment of the invention 1 In the light hydrocarbon compensation correction method, an online pyrolysis and product detection method is adopted, and the light hydrocarbons of the simulated shale samples with different maturity are compensated and corrected by comparing the proportion of the light hydrocarbons in the total hydrocarbons of the underground shale samples with corresponding maturity in the simulated shale samples and the natural evolution profile, so that the accuracy of recovery of the light hydrocarbon loss of the shale samples is remarkably improved, the experimental cost is effectively reduced, the time period is shortened, and the method is convenient for large-scale application on the basis of original data.
Further, in a specific implementation, the shale oil content parameter S provided in the embodiment of the invention 1 In the light hydrocarbon compensation correction method, in the execution step S104, the oil content parameter S of the underground shale sample is calculated 1 After the compensation correction of the light hydrocarbon is carried out, the method can further comprise the following steps: establishing a light hydrocarbon compensation plate corresponding to a downhole shale sample containing a plurality of maturity; and according to the shale sample light hydrocarbon compensation plate, obtaining compensation coefficients corresponding to the shale samples with other maturity degrees and carrying out compensation correction of the light hydrocarbon.
By comparing the simulated shale samples with the natural evolution profile, the light hydrocarbon (C 15 - ) The proportion of the light hydrocarbon compensation plate can compensate and correct the light hydrocarbon of the underground shale samples with different maturity, so as to establish a light hydrocarbon compensation plate (also called a light hydrocarbon recovery plate) of the shale samples with different maturity. The light hydrocarbon compensation coefficient (also called as a recovery coefficient) based on the shale samples with different maturity can be used for the original S of the shale samples with different maturity 1 The values were light hydrocarbon recovered.
In specific implementation, the shale oil content parameter S provided in the embodiment of the invention 1 In the light hydrocarbon compensation correction method, in the execution step S101, the simulated shale samples are respectively subjected toThe method can further comprise the following steps before the downhole shale samples with corresponding maturity in the quality and natural evolution profile are subjected to on-line pyrolysis: firstly, pyrolyzing a coal sample with low maturity in a field geological profile or a mine, measuring the reflectivity of a corresponding mirror body at different temperature points, and calibrating the maturity corresponding to the different temperature points; then, a downhole shale sample is selected having a maturity corresponding to its specular reflectance value. The reflectivity of the vitrinite is a common organic matter maturity index and is used for calibrating the thermal evolution degree of organic matters from early diagenetic action to deep deterioration stage. Preferably, a downhole shale sample may be selected having a maturity that is the same as or similar to the measured specular reflectance values.
Specifically, in order to accurately calibrate the thermal evolution maturity of the underground shale samples corresponding to the simulated shale samples at different temperature points, a coal sample with low maturity is selected to start a thermal simulation experiment, and the temperature points are calibrated by measuring the reflectivities of the mirror bodies at different temperature points of the coal sample. Preferably, the different temperature points can be selected from 360, 390, 420, 450, 480, 510 ℃ and the like.
Further, in practice, before selecting the downhole shale sample having the maturity corresponding to the vitrinite reflectance in the above steps, the method may further comprise: determining the maturity of the downhole shale sample according to the depth of the downhole shale sample. That is, the maturity of the downhole shale sample may be determined based on the relationship of depth to maturity.
In specific implementation, the shale oil content parameter S provided in the embodiment of the invention 1 In the light hydrocarbon compensation correction method, in the process of executing the step S101 to perform the on-line pyrolysis, the method may include: setting a target temperature of the downhole shale sample to a first constant value (e.g., 300 ℃); setting the target temperature of the simulated shale sample to be different temperature points of coal sample measurement, such as: the target temperature of the simulated shale sample is set to 360, 390, 420, 450, 480, 510 ℃ and the like; the target temperatures of the simulated shale samples are different, and the temperature rising rates are different.
In specific implementation, the shale oil provided by the embodiment of the inventionRate parameter S 1 The light hydrocarbon compensation correction method, before executing the step S101 to perform online pyrolysis, further includes: the temperature of the transmission line between the thermal cracking instrument and the gas chromatograph-mass spectrometer is set to a second constant value (e.g., 250 ℃).
In specific implementation, the shale oil content parameter S provided in the embodiment of the invention 1 In the light hydrocarbon compensation correction method, in the process of executing the quantitative analysis of the hydrocarbon component in the step S102, the method specifically may include: after the underground shale sample and the simulated shale sample reach the corresponding target temperatures and the constant temperature is set for a period of time, utilizing a liquid nitrogen thermos cup placed at the front end of the chromatographic column to enrich pyrolysis products; after the pyrolysis product enrichment is completed, the pyrolysis product is transmitted to a gas chromatograph-mass spectrometer through a chromatographic column for quantitative analysis of hydrocarbon components.
The shale oil content parameter S provided by the invention is prepared by taking a thermal cracking instrument, namely a programmable CDS-Pyroprobe 5000 and a gas chromatography-mass spectrum (GC-MS) combined instrument, namely 5975i mass spectrum and 6890 gas chromatography, wherein a chromatographic column is HP-PONA (length: 50m, inner diameter: 200 mu m, coating: 0.5 mu m), liquid nitrogen (used for enriching pyrolysis products) and carrier gas is helium as examples, and combining with FIG. 2 1 The process of online antipyresis and quantitative analysis of hydrocarbon components in the light hydrocarbon compensation correction method is illustrated by the following example:
firstly, crushing a blocky shale sample to 100 meshes (0.15 mm), blocking one end of a quartz glass tube by quartz cotton, filling about 2mg shale sample into the tube from the other end, and blocking the tube by the quartz cotton; then, after the thermal cracking instrument is cooled to room temperature, the plugged quartz tube is put into a platinum heating wire in a heating probe by forceps; finally, the heating probe is put into a heating furnace in the instrument to wait for temperature programming and heating.
In the experiment, the temperature of a transmission connecting line of the thermal cracking instrument and the gas chromatograph-mass spectrometer is set to be 250 ℃. Setting the initial temperature of a chromatographic column of a gas chromatograph-mass spectrometer to 40 ℃, and keeping the stability for 40min; then, the temperature was raised to 310℃at a rate of 5℃per minute, and then the temperature was maintained for 10 minutes. The split ratio of the gas chromatograph-mass spectrometer sample inlet is set to be 1:10. After the gas chromatograph-mass spectrometer is ready, starting a thermal cracking instrument, wherein the initial temperature of the thermal cracking instrument is set to be 30 ℃, and the target temperatures of geological shale samples with different maturity are set to be 300 ℃ and purged for 20min. The target temperatures of the simulated shale samples are respectively set to 360 ℃, 390, 420, 450, 480 and 510 ℃, the heating time is 15min, different heating rates are set according to different target temperatures, and a specific heating program is shown in the table I.
Surface shale sample Py-GC-MS thermal simulation experiment heating condition
Keeping the temperature for 20min after reaching the target temperature, placing a liquid nitrogen thermos cup at the front end of the chromatographic column for enriching the thermal cracking products, removing the liquid nitrogen thermos cup after purging, and allowing the products to enter a gas chromatograph-mass spectrometer for analysis through the chromatographic column, wherein an experimental schematic diagram is shown in figure 2.
It can be understood that, assuming that the hydrocarbon generated by the hydrocarbon source rock has no loss in the thermal simulation experiment, the amount and composition of the hydrocarbon generated by the shale in different thermal evolution stages can be obtained by performing the thermal simulation experiment (thermal cracking-gas chromatography-mass spectrometry) on the shale with low maturity. The invention adopts a thermal cracking-gas chromatography-mass spectrometry analysis method of the shale sample, and obtains S through gas chromatography-mass spectrometry characteristics of pyrolysis products obtained by thermal simulation of the low-maturity shale sample under different temperature conditions (representing different maturity) and thermal simulation of the similar shale sample with corresponding maturity 1 And (3) quantitatively calculating the light hydrocarbon loss through the comparison analysis of the gas chromatography-mass spectrum characteristics.
Taking n-alkane as an example, as shown in fig. 3, the n-alkane in the shale is divided into three parts according to the volatilizing difficulty, and the n-alkane comprises n-alkane (nC) with carbon number less than 15 15 - ) N-alkanes (nC) having a carbon number of less than 15 in the sample, which are part of the components that have been lost 15 - ) The remainder of the components, and n-alkanes (nC) having a carbon number of greater than 15 15 + ) Component (general not scattered)Loss). The left side of fig. 3 corresponds to the simulated sample (i.e., simulated shale sample) and the right side corresponds to the actual sample (i.e., downhole shale sample).
Assuming that the rock thermal simulation product is nC in the same class of samples of the same maturity 15 - /nC 15 + ([ light component lost+light component remained ]]/non-fugitive component) values are equal, i.e.:
wherein, the liquid crystal display device comprises a liquid crystal display device,
represents the pyrolysis product of n-alkane components with carbon number less than 15 in simulated shale samples,/->
Representing pyrolysis products of simulated shale samples in which n-alkane components with carbon numbers greater than 15 are not lost; />
Represents pyrolysis products of n-alkane component residues with carbon number less than 15 in the downhole shale sample,
represents pyrolysis products from which n-alkane components having a carbon number less than 15 in a downhole shale sample have been lost,
indicating pyrolysis products of the downhole shale sample in which n-alkane components having carbon numbers greater than 15 are not lost.
S can be obtained from the above 1 Amount of hydrocarbon lost in (c):
wherein each parameter value is represented by a peak area.
S 1 loss amount ＝a×S 1 ×(nC 15 The previous n-alkane loss part peak area/n-alkane total peak area) +b×S 1 ×(nC 15 Other hydrocarbon peak area/other hydrocarbon total area before) (5)
Wherein a and b are the ratios of the peak areas of the residual normal alkane and other hydrocarbons (isomers) in the downhole sample, and the calculation formulas are as follows:
a=normal paraffin peak area/(normal paraffin peak area+other hydrocarbon area) (6)
b＝1-a (7)
The following description will take a three-fold extension group 7-section (7-section long) black shale on the Erdos basin as an example. Figures 4 a-4 f show gas chromatograms of n-alkanes in pyrolysis products (schematic showing partial n-alkane distribution) of a 7-stage long, low-matured simulated shale sample of the erdosbasin (TNH-15) under different pyrolysis temperature conditions. Fig. 5 a-5 f show n-alkane gas chromatograms (schematic diagrams partially reflecting n-alkane distribution) of pyrolysis products of downhole shale samples of 7 segments of different maturity for a portion of the erdosbasin. By comparing hydrocarbon distribution characteristics of long 7-section low-maturity simulated shale samples and downhole shale samples with corresponding maturity, C in the downhole shale samples with different maturity can be calculated according to formulas (2) - (7) 15 - The hydrocarbon loss is quantitatively compensated and corrected, thereby establishing shale S with different maturity and 7 sections with length shown in figure 6 1 Light hydrocarbon compensation plate. Recovery coefficient=s after recovery in fig. 6 1 S before recovery 1 。
Based on the established long 7-section shale light hydrocarbon compensation plate, for sample points with known depth, rootAccording to the relation graph of the maturity and the depth change, the corresponding maturity can be determined, and then S in the pyrolysis data can be subjected to the pyrolysis according to the maturity 1 And (5) compensating and correcting the light hydrocarbon.
In conclusion, the invention can combine the thermal cracking device with the gas chromatography-mass spectrometer to obtain the distribution characteristics of hydrocarbon components in the simulated shale sample and the downhole shale sample with corresponding maturity, and compare the C in the total hydrocarbon of the simulated sample 15 - The proportion of hydrocarbon components quantitatively recovers the lost hydrocarbon in the shale sample under the well with corresponding maturity, and obviously and greatly improves the accuracy of recovery of the loss of the light hydrocarbon in the shale sample.
For more specific procedures of the above method, reference may be made to the corresponding contents disclosed in the foregoing embodiments, and no further description is given here.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, so that the same or similar parts between the embodiments are referred to each other.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The shale oil content parameter S provided by the invention 1 The light hydrocarbon compensation correction method is described in detail, and specific examples are applied to illustrate the principles and the implementation modes of the invention, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (9)
1. Shale oil content parameter S 1 The light hydrocarbon compensation correction method is characterized by comprising the following steps:
respectively carrying out on-line pyrolysis on the simulated shale sample and the underground shale sample with corresponding maturity in the natural evolution section;
quantitatively analyzing hydrocarbon components of pyrolysis products of the simulated shale sample and the downhole shale sample;
respectively obtaining the proportion of light hydrocarbons in the total hydrocarbons of the simulated shale sample and the underground shale sample from quantitative analysis results;
according to the comparison result of the proportion of light hydrocarbons in the total hydrocarbons of the simulated shale sample and the underground shale sample, the oil content parameter S of the geological shale sample is calculated 1 And (5) compensating and correcting the light hydrocarbon.
2. Shale oil content parameter S according to claim 1 1 The light hydrocarbon compensation correction method is characterized in that the oil content parameter S of the underground shale sample 1 After compensating and correcting the light hydrocarbon, the method further comprises the following steps:
establishing a light hydrocarbon compensation plate corresponding to the underground shale samples with a plurality of maturity;
and obtaining compensation coefficients corresponding to the shale samples with other maturity according to the shale sample light hydrocarbon compensation plate, and carrying out compensation correction of light hydrocarbon.
3. Shale oil content parameter S according to claim 2 1 The light hydrocarbon compensation correction method is characterized by further comprising the following steps before on-line pyrolysis is carried out on the simulated shale sample and the underground shale sample with corresponding maturity in the natural evolution profile respectively:
pyrolyzing a coal sample with low maturity in a field geological section or a mine, measuring the reflectivity of a corresponding mirror body at different temperature points, and calibrating the maturity corresponding to the different temperature points;
the downhole shale sample is selected having a maturity corresponding to the specular mass reflectivity.
4. A shale oil content parameter S according to claim 3 1 The light hydrocarbon compensation correction method is characterized by comprising the following steps of:
setting a target temperature of the downhole shale sample to a first constant value;
setting the target temperature of the simulated shale sample as different temperature points measured by the coal sample; the target temperatures of the simulated shale samples are different, and the heating rates are different.
5. Shale oil content parameter S according to claim 4 1 The light hydrocarbon compensation correction method is characterized by respectively carrying out on-line pyrolysis on a simulated shale sample and an underground shale sample with corresponding maturity in a natural evolution section, and comprises the following steps:
and respectively carrying out on-line pyrolysis on the simulated shale sample and the underground shale sample with corresponding maturity in the natural evolution profile by adopting a thermal cracking instrument.
6. Shale oil content parameter S according to claim 5 1 The light hydrocarbon compensation correction method is characterized by quantitatively analyzing hydrocarbon components of pyrolysis products of the simulated shale sample and the underground shale sample, and comprises the following steps:
and quantitatively analyzing hydrocarbon components of pyrolysis products of the simulated shale sample and the underground shale sample by adopting a gas chromatograph-mass spectrometer.
7. Shale oil content parameter S according to claim 6 1 The light hydrocarbon compensation correction method is characterized by further comprising the following steps before on-line pyrolysis:
and setting the temperature of a transmission connecting line between the thermal cracking instrument and the gas chromatography-mass spectrometer to be a second constant value.
8. Shale oil content parameter S according to claim 7 1 The light hydrocarbon compensation correction method is characterized by comprising the following steps of:
after the underground shale sample and the simulated shale sample reach the corresponding target temperatures and are kept at constant temperature for a set period of time, enriching the pyrolysis products by utilizing a liquid nitrogen thermos cup placed at the front end of the chromatographic column;
after the pyrolysis product enrichment is completed, the pyrolysis product is transmitted to the gas chromatography-mass spectrometer through the chromatographic column for quantitative analysis of hydrocarbon components.
9. A shale oil content parameter S according to claim 3 1 A method of light hydrocarbon compensation correction, prior to selecting the downhole shale sample having a maturity corresponding to the specular reflectance, further comprising:
and determining the maturity of the underground shale sample according to the depth of the underground shale sample.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116504326A (en) * | 2023-05-16 | 2023-07-28 | 中国地质调查局油气资源调查中心 | Method and electronic equipment for determining effective oil content of shale |
| CN116504326B (en) * | 2023-05-16 | 2024-02-02 | 中国地质调查局油气资源调查中心 | Method and electronic equipment for determining effective oil content of shale |
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