CN116448530A - Shale gas reservoir lifting evolution process determining method, system, equipment and medium - Google Patents
Shale gas reservoir lifting evolution process determining method, system, equipment and medium Download PDFInfo
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- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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Abstract
The invention discloses a method, a system, equipment and a medium for determining a shale gas reservoir lifting evolution process, which relate to the shale gas reservoir evolution field, and comprise the steps of firstly determining a crack cutting relation of a shale gas reservoir crack vein body, then screening a calcite vein body from the crack vein body based on the crack cutting relation, carrying out uranium-lead (U-Pb) targeted operation on the calcite vein body to obtain a targeted sample, then determining the formation years of the calcite vein body based on the targeted sample, determining a uniform temperature average value of a gas-liquid two-phase salt inclusion in the calcite vein body, and finally determining the adjustment period of the lifting evolution stage of the shale gas reservoir based on the formation years and the uniform temperature average value of the calcite vein body.
Description
Technical Field
The invention relates to the field of shale gas reservoirs, in particular to a method, a system, equipment and a medium for determining a shale gas reservoir lifting evolution process.
Background
In recent years, shale gas exploration and development has become an important field of global oil and gas exploration, and at present, 5 large and medium shale gas production bases of Fuling, changning, weiyuan, zhaotong and Weirong have been built by taking Sichuan basin as an origin in China. The whole five-peak-longmaxi group is in deep water carbon-rich high-silicon deposition, organic matter holes and microcracks provide good storage space for the deep water carbon-rich high-silicon deposition, but the deep water carbon-rich high-silicon deposition is located in a complex structural area at the periphery of a Sichuan basin, multi-stage structural adjustment is carried out, the storage condition is the key of shale gas enrichment and storage, the pressure is taken as the most direct index for reflecting the quality of the storage condition, and research shows that the higher the pressure coefficient is, the better the storage condition is, and the higher the gas content is. Therefore, the pressure research in the shale gas reservoir lifting process is developed, the gas reservoir adjustment period is ascertained, and the pressure evolution in the gas reservoir lifting process is determined to be important for revealing the shale gas reservoir forming process and the enrichment rule.
The research aiming at pressure evolution mainly adopts a fluid inclusion Raman spectrum displacement combined with a uniform temperature method, but after the fluid inclusion is captured by carbonate minerals, deformation, fluid leakage and rebalancing are easy to occur in later-stage lifting, denudation, burial and other constructional movements, so that the uniform temperature of the fluid inclusion is possibly increased, the uniform temperature variation range of the saline inclusion at the same time is large, and the oil and gas formation time determined by combining the uniform temperature of the fluid inclusion with the reservoir burial history and the thermal evolution history has multiple resolvable properties. It is difficult for the method to fully recover all fluid events experienced by the basin and it is more impossible to determine the age of the fluid event activity.
Disclosure of Invention
In view of the above, the invention aims to provide a method, a system, equipment and a medium for determining the lifting evolution process of a shale gas reservoir, which are used for determining the adjustment period of the lifting evolution stage of the shale gas reservoir through a target sample obtained by uranium-lead custom-made target operation, objectively characterizing the lifting process of the shale gas reservoir and more accurately determining the adjustment period of the lifting evolution stage of the shale gas reservoir.
In order to solve the technical problems, the invention provides a shale gas reservoir lifting evolution process determining method, which comprises the following steps:
determining a fracture cutting relationship of a fracture vein of the shale gas reservoir;
screening calcite vein bodies from the crack vein bodies based on the crack cutting relationship, and carrying out uranium-lead targeting operation on the calcite vein bodies to obtain a target sample after targeting;
determining the age of formation of the calcite vein body based on the target sample;
determining a uniform temperature average value of a gas-liquid two-phase salt water inclusion in the calcite vein;
and determining the adjustment period of the lifting evolution stage of the shale gas reservoir based on the formation years of the calcite vein body and the uniform temperature average value.
Preferably, the uranium-lead targeting operation is performed on the calcite vein body to obtain a target sample after targeting, including:
sticking the calcite vein body on double-sided adhesive tape, and casting with low-temperature epoxy resin;
and sequentially drying, polishing and cleaning the cast calcite vein body to obtain a target sample after target making.
Preferably, determining the age of formation of calcite vein body based on the target sample comprises:
pre-ablating the target sample through a preset laser beam spot, and then ablating the target sample after pre-ablating through a test light spot to obtain a target sample after ablating;
mixing the degraded target sample with argon gas for inductively coupled plasma mass spectrometry detection to obtain corresponding detection data, and correcting the detection data based on standard reference substances;
processing the corrected data by utilizing an iolite tool, and generating an age map of the target sample by utilizing the processed data;
determining the age of formation of the calcite vein body based on the age map.
Preferably, determining the adjustment period of the lifting evolution stage of the shale gas reservoir based on the formation years of the calcite vein body and the uniform temperature average value includes:
performing single-well basin simulation based on preset single-well stratum data, preset boundary data and preset simulation software to obtain a buried history curve of the single-well basin simulation;
projecting the uniform temperature average value onto the burial history curve to obtain the age corresponding to the gas-liquid two-phase brine inclusion;
correcting the age through the formation age of the calcite vein body, and determining the adjustment period of the lifting evolution stage of the shale gas reservoir based on the corrected age.
Preferably, determining a uniform temperature average of the gas-liquid two-phase brine inclusions in the calcite vein comprises:
determining pure methane inclusion in the calcite vein and gas-liquid two-phase brine inclusion symbiotic with the pure methane inclusion;
establishing a gas-liquid two-phase uniform temperature histogram by utilizing the uniform temperature of the pure methane inclusion and the uniform temperature of the gas-liquid two-phase brine inclusion;
and determining a uniform temperature average value of the gas-liquid two-phase brine inclusion based on the gas-liquid two-phase uniform temperature histogram.
Preferably, after determining the uniform temperature average value of the gas-liquid two-phase brine inclusion in the calcite vein, the method further comprises:
determining the laser Raman spectrum displacement of the pure methane inclusion;
and determining the main peak displacement of the methane component in the pure methane inclusion based on the laser Raman spectrum displacement of the pure methane inclusion.
Preferably, after said determining the main peak shift of the methane component in the pure methane inclusion, further comprising:
determining the density of the pure methane inclusion based on the adjustment period, the uniform temperature of the pure methane inclusion, and the laser raman spectral shift of the pure methane inclusion;
judging whether the density is larger than a preset critical density or not;
if yes, judging that the pure methane inclusion is in a supercritical state, and determining the pressure of the pure methane inclusion by utilizing a preset supercritical methane state equation;
and determining the evolution of the pressure of the shale gas reservoir in the lifting process based on the pressure and the main peak displacement of the methane component in the pure methane inclusion.
In order to solve the technical problems, the invention also provides a shale gas reservoir lifting evolution process determining system, which comprises:
the first determining unit is used for determining the fracture cutting relation of fracture veins of the shale gas reservoir;
the target making unit is used for screening calcite vein bodies from the crack vein bodies based on the crack cutting relationship, and carrying out uranium-lead targeted operation on the calcite vein bodies to obtain a target sample after target making;
a second determining unit configured to determine a formation age of the calcite vein body based on the target sample;
a third determining unit for determining a uniform temperature average value of the gas-liquid two-phase brine inclusion in the calcite vein;
and the fourth determining unit is used for determining the adjustment period of the lifting evolution stage of the shale gas reservoir based on the formation period of the calcite vein body and the uniform temperature average value.
In order to solve the technical problem, the present invention further provides an electronic device, including:
a memory for storing a computer program;
and the processor is used for realizing the steps of the shale gas reservoir lifting evolution process determining method when executing the computer program.
In order to solve the technical problem, the invention also provides a computer readable storage medium, wherein the computer readable storage medium is stored with a computer program, and the computer program realizes the steps of the shale gas reservoir lifting evolution process determining method when being executed by a processor.
The invention aims to provide a method, a system, equipment and a medium for determining a shale gas reservoir lifting evolution process, which are characterized in that firstly, a crack cutting relation of crack vein bodies of a shale gas reservoir is determined, then calcite vein bodies are screened out from the crack vein bodies based on the crack cutting relation, targeted operation of uranium-lead fixed year is carried out on the calcite vein bodies to obtain targeted samples after targeted, then the formation years of the calcite vein bodies are determined based on the targeted samples, uniform temperature average values of gas-liquid two-phase salt water inclusion bodies in the calcite vein bodies are determined, finally, the adjustment period of the shale gas reservoir lifting evolution stage is determined based on the formation years and the uniform temperature average values of the calcite vein bodies.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a process flow diagram of a shale gas reservoir lifting evolution process determination method provided by the invention;
FIG. 2 is a simulation of a single well basin of Raixow 1 well provided by the present invention;
FIG. 3 is a schematic representation of another single well basin of Raixow 1 well provided by the present invention;
FIG. 4 is a graph showing a uniform temperature distribution of a gas-liquid two-phase fluid inclusion in calcite veins in accordance with the present invention;
FIG. 5 is a graph showing the uniform temperature of the inclusion of pure methane in calcite veins according to the present invention;
FIG. 6 is a graph of laser in-situ uranium-lead dating results of calcite vein bodies provided by the invention;
FIG. 7 is a laser Raman spectrum of pure methane inclusion in calcite vein provided by the invention;
fig. 8 is a shale gas reservoir pressure evolution diagram in the lifting process of the ruixi 1 well provided by the invention;
fig. 9 is a schematic structural diagram of an electronic device according to the present invention.
Detailed Description
The invention aims to provide a method, a system, equipment and a medium for determining the lifting evolution process of a shale gas reservoir, wherein a target sample obtained through uranium-lead targeted targeting operation is used for determining the adjustment period of the lifting evolution stage of the shale gas reservoir, objectively characterizing the lifting process of the shale gas reservoir and more accurately determining the adjustment period of the lifting evolution stage of the shale gas reservoir.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. 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.
Referring to fig. 1, fig. 1 is a process flow chart of a shale gas reservoir lifting evolution process determining method provided by the invention, wherein the method comprises the following steps:
s10, determining a fracture cutting relationship of fracture veins of a shale gas reservoir;
s11, screening calcite vein bodies from the crack vein bodies based on a crack cutting relationship, and carrying out uranium-lead targeting operation on the calcite vein bodies to obtain a target sample after targeting;
s12, determining the formation age of calcite vein based on the target sample;
s13, determining a uniform temperature average value of a gas-liquid two-phase salt water inclusion in calcite vein;
and S14, determining the adjustment period of the lifting evolution stage of the shale gas reservoir based on the formation years of calcite vein bodies and the uniform temperature average value.
According to the invention, firstly, calcite vein bodies are screened according to the crack cutting relation of the crack vein bodies of the shale gas reservoir, uranium-lead targeted operation is carried out on the calcite vein bodies, the formation time of the calcite vein bodies can be determined according to the obtained target samples, then the uniform temperature average value of the gas-liquid two-phase salt water inclusion bodies in the calcite vein bodies is determined, the adjustment time of the lifting evolution stage of the shale gas reservoir can be determined according to the formation time of the calcite vein bodies and the uniform temperature average value, the adjustment time of the lifting evolution stage of the shale gas reservoir can be quantitatively determined through the uranium-lead targeted operation, the scheme integrity is ensured, and the subsequent determination of the pressure evolution in the lifting process of the shale gas reservoir is facilitated.
In practical application, the method for determining the fracture cutting relationship of the fracture vein of the shale gas reservoir generally comprises the steps of observing the fracture cutting relationship of the fracture vein of the shale gas reservoir through a hand specimen of the fracture vein of the shale gas reservoir, selecting a sample (calcite vein) with a larger vein as much as possible for tabletting, and carrying out uranium-lead targeted operation on the vein at the same position.
It should be further noted that the adjustment period of the lifting evolution stage of the shale gas reservoir is the same as the destruction period of the shale gas reservoir, the crack opening period of the lifting evolution stage of the shale gas reservoir, and the formation period of the fracture.
The embodiment provides a shale gas reservoir lifting evolution process determining method, firstly determining a crack cutting relation of crack pulse bodies of a shale gas reservoir, screening calcite pulse bodies from the crack pulse bodies based on the crack cutting relation, performing uranium-lead targeted operation on the calcite pulse bodies to obtain targeted target samples, determining formation times of the calcite pulse bodies based on the target samples, determining uniform temperature average values of gas-liquid two-phase salt water inclusion bodies in the calcite pulse bodies, and finally determining adjustment times of the shale gas reservoir lifting evolution stages based on the formation times and the uniform temperature average values of the calcite pulse bodies.
Based on the above embodiments:
as a preferred embodiment, the uranium-lead targeting operation is performed on the lithotomy vein body to obtain a target sample after targeting, comprising:
sticking calcite vein bodies on double-sided adhesive tapes, and casting with low-temperature epoxy resin;
and (3) sequentially drying, polishing and cleaning the cast calcite vein body to obtain a target sample after target making.
In the invention, calcite vein bodies are stuck on double-sided adhesive, and are cast by low-temperature epoxy resin, and finally the cleaned calcite vein bodies are target samples after target making after drying, polishing and cleaning operations, so that the target samples after target making can be accurately obtained.
In practical application, the uranium-lead targeting operation of calcite vein is generally carried out by randomly selecting a certain number of calcite particles to be adhered on a double-sided adhesive tape under a binocular stereo microscope (OLYMPUS), casting with low-temperature epoxy resin, drying overnight, polishing with 5000-mesh sand paper after the epoxy resin is fully cured, checking under a polarizing microscope to determine that the maximum cross section of calcite is ground, and polishing the calcite surface on an automatic polishing machine until the calcite surface achieves a mirror effect. And cleaning the target surface by using alcohol, a detergent and water in sequence in ultrasonic waves, wherein the completion of the cleaning process represents the completion of target making.
As a preferred embodiment, determining the age of formation of calcite veins based on a target sample comprises:
pre-ablating the target sample through a preset laser beam spot, and then ablating the target sample after pre-ablating through a test light spot to obtain a target sample after ablating;
mixing the degraded target sample with argon gas for inductively coupled plasma mass spectrometry detection to obtain corresponding detection data, and correcting the detection data based on standard reference substances;
processing the corrected data by utilizing an iolite tool, and generating an age chart of the target sample by utilizing the processed data;
age of formation of calcite vein body was determined based on age map.
In the invention, the target sample is pre-degraded and degraded sequentially through the preset laser beam spots and the test light spots, the degraded target sample is mixed with argon gas to perform inductively coupled plasma mass spectrometry detection so as to obtain corresponding detection data, and the detection data is corrected based on standard reference substances, so that the accuracy of the part of the test data is ensured; and then the corrected data are processed by utilizing the iolite tool to obtain an age chart of the target sample, and finally the formation age of the calcite vein body is determined based on the age chart, so that the accuracy of the determination process is improved.
In practical application, before target samples are pre-degraded by preset laser beam spots, the target samples can be subjected to ultrasonic treatment, namely, the target samples are cleaned by ultrapure water (MQ) and then dried, the target samples are placed in a sample rack and placed in a sample pool for testing, and before formal testing, all to-be-tested points are pre-degraded by laser beam spots with the same size, for example, under the condition of pre-degraded 60, potential pollution on the surfaces of minerals is eliminated; the size of the test light spot can be 120 mu m, the frequency can be 14.65Hz, the energy can be 5.8mJ, the background time can be 15s, and the ablation time can be 20s; delivering a sample generated by the ablation out of a sample cell by He (Helium) gas, mixing with Ar (Argon ) gas, and then entering an ICP-MS (Inductively coupled plasma-Mass Spectrometry, inductively coupled plasma mass spectrometry) to finish the test; during testing, firstly, testing a standard sample, and then testing a target sample; the raw data obtained were corrected with NIST614 (standard reference substance) as an internal standard, the offline processing of the analytical data (including selection of samples and blank signals and calculation of element content) was treated with iolite, and the age map (Tera-wasser burg harmonic) was projected with Isoplot and the age data was further corrected.
It should be noted that the present invention is not limited to the number of pre-ablation times, the size of the test light spot, the frequency of the test light spot, the energy of the test light spot, the background time of the test light spot, and the ablation time of the test light spot, and the above data need to be determined according to actual needs.
As a preferred embodiment, determining the adjustment period of the lift evolution stage of the shale gas reservoir based on the formation years of calcite vein bodies and the uniform temperature average value includes:
performing single-well basin simulation based on preset single-well stratum data, preset boundary data and preset simulation software to obtain a buried history curve of the single-well basin simulation;
projecting the uniform temperature average value onto the buried history curve to obtain the age corresponding to the gas-liquid two-phase salt water inclusion;
age is corrected through formation years of calcite vein bodies, and adjustment period of the lifting evolution stage of the shale gas reservoir is determined based on the corrected age.
According to the method, single-well basin simulation is carried out through preset single-well stratum data, preset boundary data and preset simulation software to obtain a buried history curve of the single-well basin simulation, then uniform temperature average values of the gas-liquid two-phase brine inclusion are projected onto the buried history curve to obtain ages corresponding to the gas-liquid two-phase brine inclusion, finally, the ages are corrected through formation ages of calcite vein bodies, the adjustment period of the lifting evolution stage of the shale gas reservoir is determined based on the corrected ages, and the adjustment period of the lifting evolution stage of the shale gas reservoir is accurately determined.
In practical application, single well basin simulation is performed on preset single well stratum data (deposition and ablation time, deposition and ablation thickness, lithology, storage and preservation matching, original organic carbon, hydrogen index and organic matter thermal evolution maturity) and preset boundary data (paleo-water depth, deposition water interface temperature and geothermic value), and accuracy of simulation of the maximum burial depth is verified according to the organic matter thermal evolution maturity (preset single well stratum data).
As a preferred embodiment, determining a uniform temperature average of gas-liquid two-phase brine inclusions in calcite veins comprises:
determining pure methane inclusion and gas-liquid two-phase brine inclusion symbiotic with the pure methane inclusion in calcite vein;
establishing a gas-liquid two-phase uniform temperature histogram by using the uniform temperature of the pure methane inclusion and the uniform temperature of the gas-liquid two-phase brine inclusion;
and determining the uniform temperature average value of the gas-liquid two-phase salt water inclusion based on the gas-liquid two-phase uniform temperature histogram.
In the invention, the pure methane inclusion and the gas-liquid two-phase brine inclusion symbiotic with the pure methane inclusion are found in the calcite vein, the uniform temperature of the pure methane inclusion and the uniform temperature of the gas-liquid two-phase brine inclusion are utilized to establish a gas-liquid two-phase uniform temperature histogram, and finally, the uniform temperature average value of the gas-liquid two-phase brine inclusion is determined based on the gas-liquid two-phase uniform temperature histogram, so that the uniform temperature average value of the gas-liquid two-phase brine inclusion is accurately determined, and the reliability of the scheme is improved.
In practical application, a polarizing microscope is generally used to perform mineralogical observation on fluid inclusions in a crack vein, to distinguish quartz veins from calcite veins, to find pure methane inclusions and gas-liquid two-phase brine inclusions symbiotic with the pure methane inclusions in the calcite veins, to perform uniform temperature measurement experiments on the pure methane inclusions and the gas-liquid two-phase fluid inclusions by using a LINKAM THMS type cold and hot stage, to obtain uniform temperatures of the pure methane inclusions and the gas-liquid two-phase fluid inclusions, to establish a gas-liquid two-phase uniform temperature histogram, and to determine a uniform temperature average value of the gas-liquid two-phase brine inclusions, wherein the value represents a formation temperature of the gas-liquid two-phase brine inclusions.
As a preferred embodiment, after determining the uniform temperature average value of the gas-liquid two-phase brine inclusion in the calcite vein, the method further comprises:
determining the laser Raman spectrum displacement of the pure methane inclusion;
the main peak shift of the methane component in the pure methane inclusion is determined based on the laser raman spectral shift of the pure methane inclusion.
In the invention, the laser Raman spectrum displacement of the pure methane inclusion is determined, and the main peak displacement of the methane component in the pure methane inclusion is determined based on the laser Raman spectrum displacement of the pure methane inclusion, so that the subsequent determination of pressure evolution in the gas reservoir lifting process is facilitated.
In practical application, a LABHR-VIS LabRAM HR800 research grade micro-laser raman spectrometer is generally used for developing laser raman spectrum displacement analysis on pure methane inclusion in a litholytic vein body to determine main peak displacement of methane (CH 4) component in the pure methane inclusion.
As a preferred embodiment, after determining the main peak shift of the methane component in the pure methane inclusion, further comprising:
determining the density of the pure methane inclusion based on the adjustment period, the uniform temperature of the pure methane inclusion and the laser raman spectrum shift of the pure methane inclusion;
judging whether the density is greater than a preset critical density or not;
if so, judging that the pure methane inclusion is in a supercritical state, and determining the pressure of the pure methane inclusion by utilizing a preset supercritical methane state equation;
and determining the evolution of the pressure of the shale gas reservoir in the lifting process based on the main peak displacement of the methane component in the pressure and the pure methane inclusion.
In the invention, in order to judge whether the pure methane inclusion is in a supercritical state, the density of the pure methane inclusion is determined based on the adjustment period of the lifting evolution stage of the shale gas reservoir, the uniform temperature of the pure methane inclusion and the laser Raman spectrum displacement of the pure methane inclusion, and whether the density is greater than a preset critical density is judged, if the density is greater than the preset critical density, the pure methane inclusion is in the supercritical state, at this time, the pressure of the pure methane inclusion is determined by utilizing a preset supercritical methane state equation, and further the evolution of the pressure of the shale gas reservoir in the lifting process is determined, so that the pressure evolution of the shale gas reservoir in the lifting process can be obtained, and the follow-up study of the shale gas reservoir is facilitated.
The formula for determining the uniform temperature of the inclusion of pure methane is shown in formula 1: a kind of electronic device with high-pressure air-conditioning systemIn the formula 1, ρCH4 is the density of the inclusion of pure methane, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the Th is the uniform temperature of the inclusion of pure methane, DEG C; h is an intermediate parameter between the density of the pure methane inclusion and the uniform temperature of the pure methane inclusion. A formula for determining the laser raman spectral shift of a pure methane inclusion, formula 2 is: ρch4= -5.17331 x 10 -5 *D 3 +5.53081*10 -4 *D 2 -3.51387*10 -2 * D and d=v d -V 0 . In formula 2: ρch4 is the density of pure methane inclusion, g/cm 3 ；V d A peak value which is a pure methane raman scattering peak; v (V) 0 For the raman scattering peak of pure methane at a pressure close to 0, a calibration value of 2917.58cm was used here -1 The method comprises the steps of carrying out a first treatment on the surface of the D is an intermediate parameter between the pure methane raman scattering peak and the density of pure methane inclusions. Presetting supercriticalMethane state equation, equation 3: />Wherein, the liquid crystal display device comprises a liquid crystal display device,is-> In the formula 3, Z is a compression factor; p is the pressure, 10 -1 MPa; v is the molar volume, dm 3 The mol can be calculated from the pure methane inclusion density ρ and the molar mass M; r is a gas constant and takes the value of 0.008314467MPa.dm 3 .K -1 .mol -1 The method comprises the steps of carrying out a first treatment on the surface of the T is the temperature, K; p (P) r 、V r And T r The pressure, the volume and the temperature are respectively compared, and the dimensions are 1; p (P) c 、V c And T c The critical pressure, the contrast volume and the contrast temperature are respectively 4.6MPa, 190.4K; a, a 1 -a 12 Is a preset parameter, which is 0.0872553928, -0.752599476, 0.375419887, 0.0107291342, 0.0054962636, -0.0184772802, 0.000318993183, 0.000211079375, 0.0000201682801, -0.0000165606189, 0.000119614546, -0.000108087289, a is 0.0448262295, beta is 0.75397, gamma is 0.077167, and B, C, D, E, F are intermediate parameters.
It should be further noted that, for the na's region, the core at 748.69m is inclined to the na's 1 well, and the pressure evolution is performed in the shale gas reservoir lifting process, the na's 1 well sample is mostly in the clay-rich siliceous shale lithofacies (quartz content is 62.2%, clay mineral is 14.6%), and has the characteristics of over-high maturity (2.35%), comparatively developed organic matter (4.177%), and the like, and the organic matter content, i.e. the thermal evolution degree, represents the average level of the longmaxi group. The specific operation is as follows:
(1) Single well stratum data (deposition and ablation time, deposition and ablation thickness, lithology, storage and preservation matching, original organic carbon, hydrogen index, organic matter thermal evolution maturity) and boundary data (paleo-water depth, deposition water interface temperature and geothermal heat flow value) are determined through means of logging data, literature investigation and the like, single well basin simulation is conducted through PetroMod1D software, accuracy of simulation maximum burial depth is verified through organic matter thermal evolution maturity, and basin simulation results are shown in fig. 2 and 3.
(2) And (3) carrying out pure methane inclusion uniform temperature and gas-liquid two-phase inclusion uniform temperature measurement experiments on the Ruixi 1 Jing pulse body sheet by using a LINKAM THMS cold and hot stage, obtaining the uniform temperature of the pure methane inclusion and the gas-liquid two-phase fluid inclusion, establishing a gas-liquid two-phase uniform temperature histogram, and further determining a uniform temperature average value, wherein the value represents the formation temperature of the gas-liquid two-phase salt water inclusion, and the main temperature distribution is 80-100 ℃, 130-150 ℃ and 180-200 ℃. There is a phase 3 adjustment during the shale gas reservoir lifting process as shown in fig. 4. The uniform temperature measurement of the pure methane inclusion adopts a low-temperature phase change method, small bubbles appear when the pure methane inclusion is quickly frozen to minus 120 ℃, the temperature is slowly raised to minus 90.6 ℃, the bubbles disappear and are uniformly in a liquid phase, as shown in figure 5, the phase transition result in microscopic temperature measurement of the pure methane inclusion shows that the pure methane inclusion is captured in a high-density supercritical system, the uniform temperature of the pure methane inclusion is mainly distributed at minus 105.4 ℃ to minus 87.7 ℃, and the average value is minus 96.5 ℃.
(3) Performing laser in-situ laser calcite U-Pb years test on the lithotomy pulse by using a laser ablation-inductively coupled plasma mass spectrometer, wherein the test light spot size is 120 mu m, the frequency is 14.65Hz, the energy is 5.8mJ, the background time is 15s, and the ablation time is 20s; using NIST614 as an internal standard correction, offline processing of the analytical data (including selection of samples and blank signals and calculation of element content) was performed using iolite, age-mapping with Isoplot and further correction of age data to obtain the period of hydrothermal activity years of 82.35±3.6Ma (mswd=3.6), 84.34 ±2.2Ma (mswd=2.2) and 114±12Ma (mswd=3.6), as shown in fig. 6, and further accurate determination of old fluid activity years, which also represents the two-stage fracture opening years, gas reservoir adjustment years, representing the initial lifting period (110 Ma) and the rapid lifting period (80 Ma), respectively, corresponding to the captured inclusion period.
(4) Raman spectrum analysis
The laser Raman experiment can effectively identify various inclusion according to the characteristic peak and intensity of the components in the spectrogram, and can perform qualitative and quantitative analysis on the inclusion components so as to determine host minerals and inclusion components thereof; in addition, the density of the pure methane inclusion and the capture pressure thereof can be quantitatively calculated according to the raman scattering peak of the pure methane in the pure methane inclusion. On the basis of microscopic observation of fluid inclusion, the inclusion with regular morphology and better preservation is selected for laser Raman spectrum analysis, as shown in figure 7, the laser Raman spectrum is mainly high-intensity pure methane Raman scattering peak, and the wave number is mainly 2910.9-2912.21 cm < -1 >.
(5) Pressure evolution recovery
According to formula 1, the density of the pure methane inclusion is calculated by using the uniform temperature of the pure methane inclusion, and the density range of the pure methane inclusion is 0.270-0.327 g/cm 3 Average value of 0.284g/cm 3 . According to formula 2, calculating the density of the pure methane inclusion by utilizing the Raman spectrum displacement of the pure methane, wherein the density of the pure methane inclusion ranges from 0.205 g/cm to 0.289g/cm 3 Average value of 0.247g/cm 3 . The two methods have better consistency. The calculated density is greater than the density of the supercritical pure methane, the pure methane belongs to a supercritical state, and the pure methane inclusion pressure can be recovered by utilizing a supercritical pure methane state equation (formula 3), wherein the recovered pressure is 45.5-63.0 MPa; the pressure coefficient is 0.8-1.4. The temperature, pressure and pressure coefficient of the five peak groups of the Ruixi 1 well, namely the shale of the Longmaxi group, are 42 ℃, 14.4MPa and 0.8 respectively, the starting point pressure and pressure coefficient of the five peak groups, namely the shale of the Longmaxi group, before the Yanshan period structure of the shale is lifted (about 110 MPa) are selected to be 63MPa and 1.4 respectively, and the gas density is 0.266g/cm 3 . The pressure evolution in the lifting process mainly goes through three stages: 110-80 Ma from the moment, the first stage slowly rises to cause little reduction of abnormal high pressure generated by shale gas generation of five peak groups-Longmaxi groups at the maximum burial depth stage, the shale pressure is reduced from 63MPa at the initial stage of rising to 44MPa, the pressure coefficient is reduced from 1.4 to 1.3, as shown in figure 8, the second stage (80-65 Ma from the moment) reduces from 44MPa to 28MPa, and the pressure system is thatThe number is reduced from 1.3 to 1.05; the reduction in shale layer pressure at this stage is controlled by the shale layer temperature reduction and shale gas loss. And in the third stage (65-0 Ma from now), the shale pressure is reduced from 28MPa to 14MPa, the pressure coefficient is reduced from 1.05 to 0.8, the gas reservoir is changed to normal pressure, and the pressure is kept at the stage, so that the gas reservoir continuously and slowly dissipates.
The invention also provides a corresponding embodiment of the shale gas reservoir lifting evolution process determining system, which comprises the following steps:
the first determining unit is used for determining the fracture cutting relation of fracture veins of the shale gas reservoir;
the target making unit is used for screening calcite vein bodies from the crack vein bodies based on the crack cutting relationship, and carrying out uranium-lead year-based target making operation on the calcite vein bodies so as to obtain a target sample after target making;
a second determining unit for determining the formation years of calcite vein bodies based on the target samples;
a third determining unit for determining a uniform temperature average value of the gas-liquid two-phase brine inclusion in the calcite vein;
and the fourth determining unit is used for determining the adjustment period of the lifting evolution stage of the shale gas reservoir based on the formation years of the calcite vein body and the uniform temperature average value.
The shale gas reservoir lifting evolution process determining system provided in this embodiment corresponds to the above method, and therefore has the same beneficial effects as the above method, so that the embodiments of the shale gas reservoir lifting evolution process determining system part refer to the description of the embodiments of the method part, and are not repeated here.
Referring to fig. 9, fig. 9 is a schematic structural diagram of an electronic device according to the present invention, including:
a memory 20 for storing a computer program;
the processor 21 is configured to implement the steps of the shale gas reservoir lifting evolution process determining method when executing the computer program.
The electronic device provided in this embodiment may include, but is not limited to, a smart phone, a tablet computer, a notebook computer, a desktop computer, or the like.
Processor 21 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 21 may be implemented in hardware in at least one of a digital signal processor (Digi tal Signal Processor, DSP), a Field programmable gate array (Field-Programmable Gate Array, FPGA), a programmable logic array (Programmable Logic Array, PLA). The processor 21 may also comprise a main processor, which is a processor for processing data in an awake state, also called central processor (Central Process ing Unit, CPU), and a coprocessor; a coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 21 may be integrated with an image processor (Graphics Process ing Unit, GPU) for taking care of rendering and rendering of the content that the display screen is required to display. In some embodiments, the processor 21 may also include an artificial intelligence (Artificial Intelligence, AI) processor for processing computing operations related to machine learning.
Memory 20 may include one or more computer-readable storage media, which may be non-transitory. Memory 20 may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In this embodiment, the memory 20 is at least used for storing a computer program 201, where the computer program, after being loaded and executed by the processor 21, can implement relevant steps of the shale gas reservoir lifting evolution process determining method disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 20 may further include an operating system 202, data 203, and the like, where the storage manner may be transient storage or permanent storage. The operating system 202 may include Windows, unix, linux, among others. The data 203 may include, but is not limited to, shale gas reservoir lift evolution process determination methods and the like.
In some embodiments, the electronic device may further include a display 22, an input-output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.
Those skilled in the art will appreciate that the structure shown in fig. 9 is not limiting of the electronic device and may include more or fewer components than shown.
The embodiment aims to provide an electronic device, wherein a memory 20 is used for storing a computer program, and a processor 21 is used for realizing the steps of the shale gas reservoir lifting evolution process determining method when the computer program is executed, so that the determining process is more efficient and accurate.
The invention also provides an embodiment corresponding to the computer readable storage medium, wherein the computer readable storage medium is stored with a computer program, and the steps of the shale gas reservoir lifting evolution process determining method are realized when the computer program is executed by a processor.
It will be appreciated that the methods of the above embodiments, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored on a computer readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in part or in whole or in part in the form of a software product stored in a storage medium for performing all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The computer readable storage medium provided in this embodiment corresponds to the above method, and therefore has the same beneficial effects as the above method, so that the embodiments of the computer readable storage medium portion are referred to the description of the embodiments of the method portion, and are not repeated here.
It should be noted that in this specification, 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 previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The shale gas reservoir lifting evolution process determining method is characterized by comprising the following steps of:
determining a fracture cutting relationship of a fracture vein of the shale gas reservoir;
screening calcite vein bodies from the crack vein bodies based on the crack cutting relationship, and carrying out uranium-lead targeting operation on the calcite vein bodies to obtain a target sample after targeting;
determining the age of formation of the calcite vein body based on the target sample;
determining a uniform temperature average value of a gas-liquid two-phase salt water inclusion in the calcite vein;
and determining the adjustment period of the lifting evolution stage of the shale gas reservoir based on the formation years of the calcite vein body and the uniform temperature average value.
2. The shale gas reservoir lifting evolution process determining method according to claim 1, wherein the uranium-lead targeting operation is performed on the calcite vein body to obtain a targeted sample, and the method comprises the following steps:
sticking the calcite vein body on double-sided adhesive tape, and casting with low-temperature epoxy resin;
and sequentially drying, polishing and cleaning the cast calcite vein body to obtain a target sample after target making.
3. The shale gas reservoir lift evolution process determination method of claim 1, wherein determining the age of formation of calcite veins based on the target sample comprises:
pre-ablating the target sample through a preset laser beam spot, and then ablating the target sample after pre-ablating through a test light spot to obtain a target sample after ablating;
mixing the degraded target sample with argon gas for inductively coupled plasma mass spectrometry detection to obtain corresponding detection data, and correcting the detection data based on standard reference substances;
processing the corrected data by utilizing an iolite tool, and generating an age map of the target sample by utilizing the processed data;
determining the age of formation of the calcite vein body based on the age map.
4. The shale gas reservoir lift evolution process determination method of claim 1, wherein determining the adjustment period of the shale gas reservoir lift evolution stage based on the formation years of the calcite vein and the uniform temperature average value comprises:
performing single-well basin simulation based on preset single-well stratum data, preset boundary data and preset simulation software to obtain a buried history curve of the single-well basin simulation;
projecting the uniform temperature average value onto the burial history curve to obtain the age corresponding to the gas-liquid two-phase brine inclusion;
correcting the age through the formation age of the calcite vein body, and determining the adjustment period of the lifting evolution stage of the shale gas reservoir based on the corrected age.
5. The shale gas reservoir lift evolution process determination method of any one of claims 1 to 4, wherein determining a uniform temperature average of gas-liquid two-phase brine inclusions in the calcite vein comprises:
determining pure methane inclusion in the calcite vein and gas-liquid two-phase brine inclusion symbiotic with the pure methane inclusion;
establishing a gas-liquid two-phase uniform temperature histogram by utilizing the uniform temperature of the pure methane inclusion and the uniform temperature of the gas-liquid two-phase brine inclusion;
and determining a uniform temperature average value of the gas-liquid two-phase brine inclusion based on the gas-liquid two-phase uniform temperature histogram.
6. The method for determining the lifting evolution process of the shale gas reservoir according to claim 5, wherein after determining the uniform temperature average value of the gas-liquid two-phase brine inclusion in the calcite vein, further comprises:
determining the laser Raman spectrum displacement of the pure methane inclusion;
and determining the main peak displacement of the methane component in the pure methane inclusion based on the laser Raman spectrum displacement of the pure methane inclusion.
7. The shale gas reservoir lift-off evolution process determination method of claim 6, further comprising, after said determining the main peak shift of the methane component in the pure methane inclusion:
determining the density of the pure methane inclusion based on the adjustment period, the uniform temperature of the pure methane inclusion, and the laser raman spectral shift of the pure methane inclusion;
judging whether the density is larger than a preset critical density or not;
if yes, judging that the pure methane inclusion is in a supercritical state, and determining the pressure of the pure methane inclusion by utilizing a preset supercritical methane state equation;
and determining the evolution of the pressure of the shale gas reservoir in the lifting process based on the pressure and the main peak displacement of the methane component in the pure methane inclusion.
8. Shale gas reservoir lifting evolution process determining system, which is characterized by comprising:
the first determining unit is used for determining the fracture cutting relation of fracture veins of the shale gas reservoir;
the target making unit is used for screening calcite vein bodies from the crack vein bodies based on the crack cutting relationship, and carrying out uranium-lead targeted operation on the calcite vein bodies to obtain a target sample after target making;
a second determining unit configured to determine a formation age of the calcite vein body based on the target sample;
a third determining unit for determining a uniform temperature average value of the gas-liquid two-phase brine inclusion in the calcite vein;
and the fourth determining unit is used for determining the adjustment period of the lifting evolution stage of the shale gas reservoir based on the formation period of the calcite vein body and the uniform temperature average value.
9. An electronic device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the shale gas reservoir lifting evolution process determination method according to any one of claims 1 to 7 when executing the computer program.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the shale gas reservoir lift evolution process determination method according to any one of claims 1 to 7.
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| CN117129297B (en) * | 2023-10-25 | 2024-01-26 | 中国科学院地质与地球物理研究所 | Method for manufacturing standard light sheet of single-particle lunar soil sample |
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