CN111122572A - Method for analyzing development degree of inner seam of quartz particle - Google Patents
Method for analyzing development degree of inner seam of quartz particle Download PDFInfo
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Abstract
The invention discloses a method for analyzing the development degree of quartz grain internal seams. The invention relates to a method for analyzing the development degree of an inner seam of a quartz particle, which comprises the following specific steps of: respectively changing the size fraction of sand, the volume ratio of the sand and the white cement, and the axial pressure in the process of artificial rock, and respectively manufacturing the artificial rock core into corresponding slices; and counting the crack densities of all the slices to obtain the particle size of sand, the volume ratio of the sand and the white cement and the influence of the artificial rock axial pressure on the crack density of the artificial rock core, and analyzing the natural quartz grain crack development degree according to the influence. The analysis method can simulate the process of generating the inner seam of the quartz grain, and can quantitatively control the diagenetic condition, thereby knowing the influence of the diagenetic condition on the development degree of the inner seam of the quartz grain, accurately analyzing the development degree of the inner seam of the quartz grain by the known diagenetic condition and being beneficial to the field exploitation work of oil and gas.
Description
Technical Field
The invention relates to the technical field of petroleum geology, in particular to a method for analyzing the development degree of quartz grain internal seams.
Background
Quartz is the major rock-making mineral and is an important constituent of clastic rock. The chemical property of quartz is stable, and quartz is difficult to generate corrosion reaction in the diagenesis process. Quartz has a relatively high Mohs hardness (up to 7) and is a rigid particle. Unlike plastic granules which undergo plastic deformation when subjected to compaction to pseudorandomly pack the pores, rigid granules support the inter-granular pores and reduce compaction resulting in reduced inter-granular pores. However, when compaction is achieved to some extent, intragranular cracks develop within the rigid granules to counteract the overlying stresses. The intragranular fractures have positive effects on the diagenetic process of the clastic rock, the physical properties of the reservoir and the like: firstly, in the diagenesis process, cracks can communicate interparticle pores, and flow of pore fluid is facilitated, so that particles can be corroded more easily, the porosity of rocks can be further increased, corrosion products can be brought out of a diagenesis system more easily, and the pore throats cannot be blocked due to precipitation; second, the fractures can communicate some dead pores, which can be involved in the seepage of rock, which is important for the production of oil and gas.
The internal cracks of quartz grains belong to one of the microcracks, because they exist in the grains, and require a series of treatments and then observation by means of a microscope, and in the field work, it is difficult for field workers to know the development degree of the internal cracks of the quartz grains due to limited conditions.
Disclosure of Invention
The invention aims to provide a method for analyzing the development degree of the inner seam of the quartz particle based on the artificial rock core technology, aiming at the defects in the prior art.
The invention relates to a method for analyzing the development degree of an inner seam of a quartz particle, which comprises the following specific steps of:
s1, mixing the sand and the white cement of the same size fraction according to a certain volume ratio, adding a proper amount of water, and uniformly stirring;
s2, putting the stirred mixture into a sample tube, and pre-compacting;
s3, placing the sample tube into an artificial rock core sample bin, setting temperature, time and axial pressure, and preparing an artificial rock core;
s4, taking out the prepared core, and preparing a slice after complete cooling;
s5, changing the size fraction of sand, the volume ratio of sand and white cement and the axial pressure in the artificial rock process respectively, and repeating the steps S1-S4 to prepare corresponding slices;
and S6, counting the crack densities of all the slices to obtain the particle size of sand, the volume ratio of the sand and the white cement and the influence of the artificial rock axial pressure on the crack density of the artificial rock core, and analyzing the natural quartz grain inner crack development degree according to the influence.
Preferably, in step S2, a polytetrafluoroethylene membrane is placed against the inner wall of the sample tube.
Preferably, the reaction time set in the step (3) is 6 to 12 hours, the reaction temperature is 90 to 150 ℃, and the axial pressure is 10 to 60 Mpa.
Preferably, the crack density is 4mm observed under a microscope2Number of cracks in the sheet within the range.
Preferably, the size fraction of the sand is: three particle sizes of less than 10 meshes, 10-16 meshes and more than 32 meshes.
Preferably, the volume ratio of the sand to the white cement is 10% to 30%.
The quartz grain inner seam development degree analysis method based on the artificial rock core can simulate the process of quartz grain inner seam generation and can quantitatively control diagenetic conditions, so that the influence of diagenetic conditions on the quartz grain inner seam development degree can be known, the inner seam development degree can be accurately analyzed under the known diagenetic conditions through the known conditions, and the on-site oil and gas exploitation work can be favorably carried out.
Drawings
FIG. 1a is a microscopic view of an artificial sandstone core in diagenetic conditions of example 1;
FIG. 1b is a microscopic view of an artificial sandstone core of example 4 in diagenetic conditions;
figure 1c is a microscope picture of an artificial sandstone core in diagenetic conditions of example 7;
figure 2a is a microscopic view of an artificial sandstone core in diagenetic conditions of example 2;
figure 2b is a microscopic view of an artificial sandstone core of example 5 in diagenetic conditions;
figure 2c is a microscope picture of an artificial sandstone core in diagenetic conditions of example 8;
figure 3a is a microscopic view of an artificial sandstone core in diagenetic conditions of example 3;
figure 3b is a microscopic view of an artificial sandstone core of example 6 in diagenetic conditions;
figure 3c is a microscope picture of an artificial sandstone core in diagenetic conditions of example 9.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Early preparation: and (6) sampling. The experiment adopts sand generated by weathering granite in Dabie mountain in Hubei, and the main components comprise (quartz, amphibole and granite debris). The sample is washed with tap water to remove other components except sand, dried in an oven and dried in a thermostat at 100 ℃ for 24 hours to dry the particles. The dried sand was screened into 4 categories, i.e., less than 10 mesh (gravel), 10-16 mesh (coarse sand) and greater than 32 mesh (fine sand), using 10 mesh, 16 mesh and 32 mesh sample screens.
Example one
Referring to fig. 1a, an embodiment of the present invention provides a method for evaluating a development degree of quartz grain internal seams based on an artificial core technology, including the following steps:
(1) weighing sand (less than 10 meshes) and 20% of white cement by volume percentage, mixing and stirring uniformly to obtain a mineral powder mixture, adding distilled water with the same volume as the white cement, and mixing and stirring to obtain the artificial rock core raw material. The volume percentage of sand and white cement is 5: 1.
(2) And placing a circle of polytetrafluoroethylene membrane close to the inner wall of the core tube, and then placing the uniformly stirred raw materials in the polytetrafluoroethylene membrane and performing pre-compaction.
(3) Heating and pressurizing (100 ℃, 20Mpa) to prepare the artificial sandstone core.
(4) Preparing the prepared artificial rock coreForming into common sheet, observing under microscope, and counting for 4mm2Number of internal cracks. The experimental conditions and the experimental results are shown in Table 2.
Example two
Referring to fig. 2a, an embodiment of the present invention provides a method for evaluating a development degree of quartz grain internal seams based on an artificial core technology, including the following steps:
(1) weighing sand (10-16 meshes) and white cement with the volume of 20% according to the volume percentage, mixing and stirring uniformly to obtain a mineral powder mixture, adding distilled water with the same volume as the white cement, and mixing and stirring to obtain the artificial rock core raw material. The volume percentage of sand and white cement is 5: 1.
(2) And placing a circle of polytetrafluoroethylene membrane close to the inner wall of the core tube, and then placing the uniformly stirred raw materials in the polytetrafluoroethylene membrane and performing pre-compaction.
(3) Heating and pressurizing (100 ℃, 20Mpa) to prepare the artificial sandstone core.
(4) Making the artificial core into common slice, observing under microscope, and counting for 4mm2Number of internal cracks. The experimental conditions and the experimental results are shown in Table 2.
EXAMPLE III
Referring to fig. 3a, an embodiment of the present invention provides a method for evaluating a development degree of quartz grain internal seams based on an artificial core technology, including the following steps:
(1) weighing sand (larger than 32 meshes) and 20% of white cement by volume percentage, mixing and stirring uniformly to obtain a mineral powder mixture, adding distilled water with the same volume as the white cement, and mixing and stirring to obtain the artificial rock core raw material. The volume percentage of sand and white cement is 5: 1.
(2) And placing a circle of polytetrafluoroethylene membrane close to the inner wall of the core tube, and then placing the uniformly stirred raw materials in the polytetrafluoroethylene membrane and performing pre-compaction.
(3) Heating and pressurizing (100 ℃, 20Mpa) to prepare the artificial sandstone core.
(4) Making the artificial core into common slice, observing under microscope, and counting for 4mm2Number of internal cracks. Experimental conditions and experimental resultsSee table 2.
Example four
Referring to fig. 1b, an embodiment of the present invention provides a method for evaluating a development degree of quartz grain internal seams based on an artificial core technology, including the following steps:
(1) weighing sand (less than 10 meshes) and 20% of white cement by volume percentage, mixing and stirring uniformly to obtain a mineral powder mixture, adding distilled water with the same volume as the white cement, and mixing and stirring to obtain the artificial rock core raw material. The volume percentage of sand and white cement is 5: 1.
(2) And placing a circle of polytetrafluoroethylene membrane close to the inner wall of the core tube, and then placing the uniformly stirred raw materials in the polytetrafluoroethylene membrane and performing pre-compaction.
(3) Heating and pressurizing (100 ℃ and 30Mpa) to prepare the artificial sandstone core.
(4) Making the artificial core into common slice, observing under microscope, and counting for 4mm2Number of internal cracks. The experimental conditions and the experimental results are shown in Table 2.
EXAMPLE five
Referring to fig. 2b, an embodiment of the present invention provides a method for evaluating a development degree of quartz grain internal seams based on an artificial core technology, including the following steps:
(1) weighing sand (10-16 meshes) and white cement with the volume of 20% according to the volume percentage, mixing and stirring uniformly to obtain a mineral powder mixture, adding distilled water with the same volume as the white cement, and mixing and stirring to obtain the artificial rock core raw material. The volume percentage of sand and white cement is 5: 1.
(2) And placing a circle of polytetrafluoroethylene membrane close to the inner wall of the core tube, and then placing the uniformly stirred raw materials in the polytetrafluoroethylene membrane and performing pre-compaction.
(3) Heating and pressurizing (100 ℃ and 30Mpa) to prepare the artificial sandstone core.
(4) Making the artificial core into common slice, observing under microscope, and counting for 4mm2Number of internal cracks. The experimental conditions and the experimental results are shown in Table 2.
EXAMPLE six
Referring to fig. 3b, an embodiment of the present invention provides a method for evaluating a development degree of quartz grain internal seams based on an artificial core technology, including the following steps:
(1) weighing sand (larger than 32 meshes) and 20% of white cement by volume percentage, mixing and stirring uniformly to obtain a mineral powder mixture, adding distilled water with the same volume as the white cement, and mixing and stirring to obtain the artificial rock core raw material. The volume percentage of sand and white cement is 5: 1.
(2) And placing a circle of polytetrafluoroethylene membrane close to the inner wall of the core tube, and then placing the uniformly stirred raw materials in the polytetrafluoroethylene membrane and performing pre-compaction.
(3) Heating and pressurizing (100 ℃ and 30Mpa) to prepare the artificial sandstone core.
(4) Making the artificial core into common slice, observing under microscope, and counting for 4mm2Number of internal cracks. The experimental conditions and the experimental results are shown in Table 2.
EXAMPLE seven
Referring to fig. 1c, an embodiment of the present invention provides a method for evaluating a development degree of quartz grain internal seams based on an artificial core technology, including the following steps:
(1) weighing sand (less than 10 meshes) and 20% of white cement by volume percentage, mixing and stirring uniformly to obtain a mineral powder mixture, adding distilled water with the same volume as the white cement, and mixing and stirring to obtain the artificial rock core raw material. The volume percentage of sand and white cement is 5: 1.
(2) And placing a circle of polytetrafluoroethylene membrane close to the inner wall of the core tube, and then placing the uniformly stirred raw materials in the polytetrafluoroethylene membrane and performing pre-compaction.
(3) Heating and pressurizing (100 ℃, 40Mpa) to prepare the artificial sandstone core.
(4) Making the artificial core into common slice, observing under microscope, and counting for 4mm2Number of internal cracks. The experimental conditions and the experimental results are shown in Table 2.
Example eight
Referring to fig. 2c, an embodiment of the present invention provides a method for evaluating a development degree of quartz grain internal seams based on an artificial core technology, including the following steps:
(1) weighing sand (10-16 meshes) and white cement with the volume of 20% according to the volume percentage, mixing and stirring uniformly to obtain a mineral powder mixture, adding distilled water with the same volume as the white cement, and mixing and stirring to obtain the artificial rock core raw material. The volume percentage of sand and white cement is 5: 1.
(2) And placing a circle of polytetrafluoroethylene membrane close to the inner wall of the core tube, and then placing the uniformly stirred raw materials in the polytetrafluoroethylene membrane and performing pre-compaction.
(3) Heating and pressurizing (100 ℃, 40Mpa) to prepare the artificial sandstone core.
(4) Making the artificial core into common slice, observing under microscope, and counting for 4mm2Number of internal cracks. The experimental conditions and the experimental results are shown in Table 2.
Example nine
Referring to fig. 3c, an embodiment of the present invention provides a method for evaluating a development degree of quartz grain internal seams based on an artificial core technology, including the following steps:
(1) weighing sand (larger than 32 meshes) and 20% of white cement by volume percentage, mixing and stirring uniformly to obtain a mineral powder mixture, adding distilled water with the same volume as the white cement, and mixing and stirring to obtain the artificial rock core raw material. The volume percentage of sand and white cement is 5: 1.
(2) And placing a circle of polytetrafluoroethylene membrane close to the inner wall of the core tube, and then placing the uniformly stirred raw materials in the polytetrafluoroethylene membrane and performing pre-compaction.
(3) Heating and pressurizing (100 ℃, 40Mpa) to prepare the artificial sandstone core.
(4) Making the artificial core into common slice, observing under microscope, and counting for 4mm2Number of internal cracks. The experimental conditions and the experimental results are shown in Table 2.
Example ten
The embodiment of the invention provides a method for evaluating the development degree of quartz grain internal seams based on an artificial rock core technology, which comprises the following steps:
(1) weighing sand (smaller than 10 meshes) and white cement with the volume of 10% according to the volume percentage, mixing and stirring uniformly to obtain a mineral powder mixture, adding distilled water with the same volume as that of the white cement, and mixing and stirring to obtain the artificial rock core raw material. The volume percentage of sand and white cement is 5: 1.
(2) And placing a circle of polytetrafluoroethylene membrane close to the inner wall of the core tube, and then placing the uniformly stirred raw materials in the polytetrafluoroethylene membrane and performing pre-compaction.
(3) Heating and pressurizing (100 ℃ and 30Mpa) to prepare the artificial sandstone core.
(4) Making the artificial core into common slice, observing under microscope, and counting for 4mm2Number of internal cracks. The experimental conditions and the experimental results are shown in Table 2.
EXAMPLE eleven
The embodiment of the invention provides a method for evaluating the development degree of quartz grain internal seams based on an artificial rock core technology, which comprises the following steps:
(1) weighing sand (less than 10 meshes) and 30% of white cement by volume percentage, mixing and stirring uniformly to obtain a mineral powder mixture, adding distilled water with the same volume as the white cement, and mixing and stirring to obtain the artificial rock core raw material. The volume percentage of sand and white cement is 5: 1.
(2) And placing a circle of polytetrafluoroethylene membrane close to the inner wall of the core tube, and then placing the uniformly stirred raw materials in the polytetrafluoroethylene membrane and performing pre-compaction.
(3) Heating and pressurizing (100 ℃ and 30Mpa) to prepare the artificial sandstone core.
(4) Making the artificial core into common slice, observing under microscope, and counting for 4mm2Number of internal cracks. The experimental conditions and the experimental results are shown in Table 2.
The crack development degree in the quartz grains is evaluated by the number of cracks in the same view, namely, the more the number of cracks is, the more cracks develop. In addition, the evaluation can be performed using the following table 1.
TABLE 1 evaluation table of intragranular suture development degree
| Number of cracks | (0,10] | (10,20] | (20,30] | (30,+∞] |
| Degree of intragranular suture development | Lack of development | Relatively advanced development | Moderate development | Development of |
The preparation raw materials of the embodiment of the invention adopt natural rock weathered products, and simulate the compaction process of real rock as much as possible. The pressure gradient was kept as consistent as possible during the pressurization process, and table 2 shows statistics of the development degree of the nine intragranular sutures in the first to the third examples.
TABLE 2 influence of rock size and pressure on the development of the internal seam of quartz grains
TABLE 3 influence of the matrix content on the development of the internal seams of Quartz grains
As can be seen from tables 2 and 3, the larger the pressure, the more intragranular cracks develop under otherwise constant conditions, because the increase in pressure increases the local stress between the granules, which cracks when the critical fracture pressure is reached;
under otherwise constant conditions, the quartz intragranular cracks grow as the particle size increases, because the coarser the particles, the fewer the contact points between the particles, the greater the local stresses, and thus the more intragranular cracks grow, within the same confined space. The matrix is easy to generate plastic deformation, and the plastic deformation can change hard contact among particles into soft contact, so that the higher the matrix content is, the less intragranular cracks are developed under other conditions.
The growth factor range of the natural rock is also within the above range, and in the field work, since the buried depth of the rock is known, the axial pressure is known, and the matrix content and the grain size of the rock can be determined by naked eyes, the approximate development degree of the quartz grain internal seam can be obtained by comparing the data obtained in the above example.
The above is not relevant and is applicable to the prior art.
While certain specific embodiments of the present invention have been described in detail by way of illustration, it will be understood by those skilled in the art that the foregoing is illustrative only and is not limiting of the scope of the invention, as various modifications or additions may be made to the specific embodiments described and substituted in a similar manner by those skilled in the art without departing from the scope of the invention as defined in the appending claims. It should be understood by those skilled in the art that any modifications, equivalents, improvements and the like made to the above embodiments in accordance with the technical spirit of the present invention are included in the scope of the present invention.
Claims (6)
1. A method for analyzing the development degree of inner seams of quartz grains is characterized in that: the method comprises the following specific steps:
s1, mixing the sand and the white cement of the same size fraction according to a certain volume ratio, adding a proper amount of water, and uniformly stirring;
s2, putting the stirred mixture into a sample tube, and pre-compacting;
s3, placing the sample tube into an artificial rock core sample bin, setting temperature, time and axial pressure, and preparing an artificial rock core;
s4, taking out the prepared core, and preparing a slice after complete cooling;
s5, changing the size fraction of sand, the volume ratio of sand and white cement and the axial pressure in the artificial rock process respectively, and repeating the steps S1-S4 to prepare corresponding slices;
and S6, counting the crack densities of all the slices to obtain the particle size of sand, the volume ratio of the sand and the white cement and the influence of the artificial rock axial pressure on the crack density of the artificial rock core, and analyzing the natural quartz grain inner crack development degree according to the influence.
2. The method for analyzing the development degree of the cracks in the quartz grains as set forth in claim 1, wherein: in step S2, a polytetrafluoroethylene membrane is placed against the inner wall of the sample tube.
3. The method for analyzing the development degree of the cracks in the quartz grains as set forth in claim 1, wherein: the reaction time set in the step (3) is 6-12 hours, the reaction temperature is 90-150 ℃, and the axial pressure is 10-60 Mpa.
4. The method for analyzing the development degree of the cracks in the quartz grains as set forth in claim 1, wherein: the crack density is 4mm observed and counted under a microscope2Number of cracks in the sheet within the range.
5. The method for analyzing the development degree of the cracks in the quartz grains as set forth in claim 1, wherein: the size fraction of the sand is: three particle sizes of less than 10 meshes, 10-16 meshes and more than 32 meshes.
6. The method for analyzing the development degree of the cracks in the quartz grains as set forth in claim 1, wherein: the volume ratio of the sand to the white cement is 10-30%.
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