CN110702488A - Method for determining physical property of sandstone reservoir before cementing action occurs - Google Patents
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- 230000000704 physical effect Effects 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 50
- 230000009471 action Effects 0.000 title claims description 14
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 51
- 230000035699 permeability Effects 0.000 claims abstract description 27
- 239000004568 cement Substances 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 11
- 239000011435 rock Substances 0.000 claims description 157
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 229910021532 Calcite Inorganic materials 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 9
- 239000011148 porous material Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 239000010779 crude oil Substances 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims description 5
- 238000004043 dyeing Methods 0.000 claims description 4
- 238000010191 image analysis Methods 0.000 claims description 4
- -1 potassium ferricyanide Chemical compound 0.000 claims description 4
- 230000000007 visual effect Effects 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 2
- 238000002203 pretreatment Methods 0.000 claims description 2
- 238000007596 consolidation process Methods 0.000 claims 4
- 239000004576 sand Substances 0.000 claims 1
- 238000004364 calculation method Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 14
- 239000003921 oil Substances 0.000 description 9
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
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- 150000002430 hydrocarbons Chemical class 0.000 description 2
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- RGCKGOZRHPZPFP-UHFFFAOYSA-N Alizarin Natural products C1=CC=C2C(=O)C3=C(O)C(O)=CC=C3C(=O)C2=C1 RGCKGOZRHPZPFP-UHFFFAOYSA-N 0.000 description 1
- HFVAFDPGUJEFBQ-UHFFFAOYSA-M alizarin red S Chemical compound [Na+].O=C1C2=CC=CC=C2C(=O)C2=C1C=C(S([O-])(=O)=O)C(O)=C2O HFVAFDPGUJEFBQ-UHFFFAOYSA-M 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
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- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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- 150000003839 salts Chemical class 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/30—Staining; Impregnating ; Fixation; Dehydration; Multistep processes for preparing samples of tissue, cell or nucleic acid material and the like for analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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Abstract
The invention relates to a method for determining physical property of a sandstone reservoir before cementation, which is used for measuring physical property of early strong cementation sandstone, namely measuring porosity phi0And permeability K0On the basis, dilute acetic acid solution is utilized to erode cement in the early strong-cemented sandstone to restore the sandstone state before the strong-cemented sandstone, and then physical property actual measurement is directly carried out on a sandstone sample to test the obtained porosity phi1And permeability K1The reservoir physical property before cementation is determined, the influence of human factors in the statistics and calculation processes is effectively avoided, the reservoir physical property is more consistent with the actual geological condition, and the result is more accurate.
Description
Technical Field
The invention belongs to the technical field of petroleum and natural gas exploration and development, and particularly relates to a method for determining physical properties of a sandstone reservoir before cementing.
Background
With the continuous improvement of the oil and gas exploration degree of the middle and shallow layers and the increasing demand of oil and gas reserves, the oil and gas exploration target has gradually shifted to the deep layer, the potential of deep oil and gas resources in China is huge, and the oil and gas exploration has obtained a favorable result. The medium-deep sandstone reservoir undergoes complex diagenesis transformation in the process of burying, the reservoir porosity in the geological history period also undergoes a complex evolution process, and the complexity of the matching relationship between the reservoir porosity evolution history and the hydrocarbon source rock hydrocarbon production and drainage history is an important reason for the complex medium-deep oil and gas enrichment rule and the low exploration success rate. Therefore, the accurate restoration of the paleo-porosity and paleo-permeability of the sandstone in the geological historical period has important significance for researching oil and gas transportation and gathering reservoirs. For the restoration of the ancient porosity, scholars at home and abroad at present mainly take diagenesis evolution sequences as constraints, and quantitatively calculate and analyze the influence of various diagenesis actions on the porosity of a sandstone reservoir according to the area percentages of various authigenic minerals and dissolved pores, so as to finally restore the porosity evolution of the sandstone reservoir in the geological history period; or on the basis of the method, the porosity evolution is recovered by combining the mechanical compaction simulation of the reservoir and the water-rock experiment forward modeling. For the restoration of the paleo-permeability, the functional relation between the porosity and the permeability of the sandstone in the present or geological historical period is fitted on the basis of paleo-porosity restoration, and the restored paleo-porosity is substituted into the calculation to obtain the paleo-porosity.
The existing method for determining the physical properties of the sandstone reservoir before the cementing action occurs is based on mathematical statistics, the ancient physical properties are indirectly obtained by using an 'inversion stripping' method, the process is complex, the inversion result is greatly influenced by human subjective factors, and the physical properties of the obtained sandstone reservoir are inaccurate. Therefore, a new technical method needs to be developed to obtain more accurate paleophysical properties of the sandstone reservoir.
Disclosure of Invention
Aiming at the problems that the physical property of the sandstone reservoir is inaccurate and the like in the existing method, the invention provides the method for determining the physical property of the sandstone reservoir before the cementing action occurs, which can accurately determine the physical property of the sandstone reservoir before the strong acid salt cementing occurs and provide a reference for the evolution and the recovery of the physical property of the sandstone reservoir in the geological history period.
In order to achieve the aim, the invention provides a method for determining the physical property of a sandstone reservoir before cementation, which comprises the following specific steps:
aiming at a sandstone reservoir, taking a plurality of early strong-cemented rock samples, pretreating each rock sample to obtain a rock sample with the diameter of 2.5cm and the length of 4cm, and removing residual crude oil in the rock sample; drying the rock sample to remove residual water in the rock sample, and testing the porosity phi of the rock sample0And permeability K0；
Placing the rock sample into a beaker at normal temperature, adding an acetic acid solution with the concentration of 0.3% into the beaker until the rock sample is immersed, standing for 1 hour, replacing the acetic acid solution, and repeating the process until no bubbles emerge from the rock sample;
washing the rock sample with deionized water for several times, drying the rock sample to remove residual water in the rock sample, and testing the porosity phi of the rock sample1And permeability K1The resulting porosity phi was tested1And permeability K1Namely the physical property of the reservoir before the cementing action occurs.
Further, after the rock sample corroded by the acetic acid solution is tested, the method further comprises the following steps:
selecting non-corroded rock samples for each rock sample, grinding rock slices with the thickness of 30 mu m, dyeing the rock slices, and then using microscopySelecting 10 representative visual fields for each rock slice by a lens and an image analysis system matched with a microscope, and counting the area S occupied by dyed calcite cement in the rock slice1Calculating the total area S of 10 views2Using the formula S ═ S1/S2Calculating the two-dimensional area ratio of rocks filled with the calcite cement by multiplying 100%;
porosity phi obtained from multiple rock samples0Permeability K0Porosity phi of the porous material1Permeability K1Area S1And total area S2Fitting the porosity difference phi1-φ0Difference K in permeability from S1-K0A quantitative functional relationship with the two-dimensional area ratio S of the rock;
and quantitatively recovering the ancient physical properties before the early strong cementation according to the quantitative functional relation on the basis of the area ratio delineation of the cementate.
Preferably, the rock slices are dyed with alizarin and potassium ferricyanide solutions.
Preferably, the pre-treatment of each rock sample comprises drilling, cutting and grinding.
Preferably, the rock sample is dried at 60 ℃ for 2 days to remove residual moisture in the rock sample.
Compared with the prior art, the invention has the advantages and positive effects that:
(1) according to the invention, dilute acetic acid solution is used for corrosion of the cementing material in the early strong cementing type sandstone, dilute acetic acid can dissolve carbonate cementing material without basically reacting with feldspar, quartz and other minerals, the sandstone state before sandstone strong cementing is recovered, and then physical property actual measurement is directly carried out on the sandstone sample to determine the physical property of the reservoir before cementing, so that the influence of human factors in the statistical and calculation processes is effectively avoided, the actual geological condition is more consistent, and the result is more accurate.
(2) The invention also counts the rock two-dimensional area ratio S of the carbonate cement through the dyed rock slice, and fits the rock two-dimensional area ratio S with the porosity difference phi before and after acid dissolution1-φ0Permeability difference K1-K0The function relationship of (2) can quantitatively restore the ancient physical properties before early strong cementation for rock samples with similar characteristics according to the function relationship, and provides reference for other areas, thereby providing reference for the physical property evolution restoration of sandstone reservoirs in geological history periods.
Drawings
FIG. 1 is a technical flow chart of a method of determining sandstone reservoir physical properties before cementation occurs in an embodiment of the invention;
FIG. 2 is a schematic illustration of a photograph of a rock sample after erosion of the rock sample according to an embodiment of the present invention;
FIG. 3 is a photograph of an unetched section of a rock laminate according to an embodiment of the present invention;
FIG. 4 is a functional relationship diagram of the area ratio of the XX reservoir rock cement in a certain area of the Hongkong oilfield, the porosity difference before and after acid dissolution and the permeability difference according to the embodiment of the invention;
FIG. 5 is a graph of the ancient comparison of the method of the present invention and the prior art "inversion stripping method" obtained for the same rock sample.
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
The early-stage strong-cemented sandstone is common in reservoirs, and the physical property evolution of the sandstone is usually only influenced by early-stage cementation and compaction before cementation.
In order to determine the physical properties of the sandstone reservoir before cementation of the above-mentioned type of rock, referring to fig. 1, an embodiment of the present invention provides a method for determining the physical properties of the sandstone reservoir before cementation, which comprises the following specific steps:
s1, aiming at a sandstone reservoir, taking a plurality of early strong-cemented rock samples, performing drilling, cutting and polishing pretreatment on each rock sample to obtain rock samples with the diameter of 2.5cm and the length of 4cm, and removing residual crude oil in the rock samples; drying the rock sample at a temperature of 60 DEG CDrying for 2 days to remove residual water in the rock sample, and testing the porosity phi of the rock sample0And permeability K0。
S2, placing the rock sample into a beaker at normal temperature, adding an acetic acid solution with the concentration of 0.3% into the beaker until the rock sample is immersed, standing for 1 hour, replacing the acetic acid solution, and repeating the above process until no bubbles emerge from the rock sample.
S3, washing the rock sample for several times by deionized water, drying the rock sample for 2 days at the temperature of 60 ℃, removing residual water in the rock sample, and testing the porosity phi of the rock sample by using a gas measuring method1And permeability K1The resulting porosity phi was tested1And permeability K1Namely the physical property of the reservoir before the cementing action occurs.
In this example, in order to facilitate statistics of the area occupied by the calcite cement, the rock slices were dyed using rubicin and potassium ferricyanide solutions. When counting the area occupied by calcite cement, calcite cement was dyed red.
The method of the embodiment measures the physical property of the early strong cemented sandstone, namely the porosity phi0And permeability K0On the basis, dilute acetic acid is utilized to carry out corrosion on the sandstone sample, the sandstone state before strong cementing in the recovery period is realized, and the gas measurement is carried out on the rock sample so as to determine the real physical property of the rock sample in the historical period, thereby effectively avoiding the influence of human factors in the statistical and calculation processes, being more consistent with the actual geological condition and having more accurate result.
In order to determine the physical properties of the sandstone reservoir before cementation of the above-mentioned type of rock, with reference to fig. 1, another embodiment of the present invention provides a method for determining the physical properties of the sandstone reservoir before cementation, which comprises the following specific steps:
s1, aiming at a sandstone reservoir, taking a plurality of early strong-cemented rock samples, performing drilling, cutting and polishing pretreatment on each rock sample to obtain rock samples with the diameter of 2.5cm and the length of 4cm, and removing residual crude oil in the rock samples; at a temperature ofDrying the rock sample for 2 days at the temperature of 60 ℃, removing residual water in the rock sample, and testing the porosity phi of the rock sample by using a gas measurement method0And permeability K0。
S2, placing the rock sample into a beaker at normal temperature, adding an acetic acid solution with the concentration of 0.3% into the beaker until the rock sample is immersed, standing for 1 hour, replacing the acetic acid solution, and repeating the above process until no bubbles emerge from the rock sample.
S3, washing the rock sample for several times by deionized water, drying the rock sample for 2 days at the temperature of 60 ℃, removing residual water in the rock sample, and testing the porosity phi of the rock sample by using a gas measuring method1And permeability K1The resulting porosity phi was tested1And permeability K1Namely the physical property of the reservoir before the cementing action occurs.
S4, selecting non-corroded rock samples for each rock sample, grinding rock slices with the thickness of 30 mu m, dyeing the rock slices, selecting 10 representative visual fields for each rock slice by using a microscope and an image analysis system matched with the microscope, and counting the area S occupied by the dyed calcite cement in the rock slices1Calculating the total area S of 10 views2Using the formula S ═ S1/S2Calculating the two-dimensional area ratio of rocks filled with the calcite cement by multiplying 100%;
s5 porosity φ obtained from multiple rock samples0Permeability K0Porosity phi of the porous material1Permeability K1Area S1And total area S2Fitting the porosity difference phi1-φ0Difference K in permeability from S1-K0A quantitative functional relationship with the two-dimensional area ratio S of the rock;
and S6, quantitatively recovering the ancient physical properties before early strong cementation according to the quantitative functional relation on the basis of the area proportion delineation of the cementate.
In this example, in order to facilitate statistics of the area occupied by the calcite cement, the rock slices were dyed using rubicin and potassium ferricyanide solutions. When counting the area occupied by calcite cement, calcite cement was dyed red.
The method of the embodiment measures the physical property of the early strong cemented sandstone, namely the porosity phi0And permeability K0On the basis, dilute acetic acid is utilized to carry out corrosion on the sandstone sample, the sandstone state before strong cementing in the recovery period is realized, and the gas measurement is carried out on the rock sample so as to determine the real physical property of the rock sample in the historical period, thereby effectively avoiding the influence of human factors in the statistical and calculation processes, being more consistent with the actual geological condition and having more accurate result. The invention also counts the rock two-dimensional area ratio S of the carbonate cement through the dyed rock slice, and fits the rock two-dimensional area ratio S with the porosity difference phi before and after acid dissolution1-φ0Permeability difference K1-K0The function relationship of (2) can quantitatively restore the ancient physical properties before early strong cementation for rock samples with similar characteristics according to the function relationship, and provides reference for other areas, thereby providing reference for the physical property evolution restoration of sandstone reservoirs in geological history periods.
The method of the invention is described by taking the determination process of the physical property of the sandstone reservoir before the XX reservoir rock cementation in a certain area of a Hongkong oil field as an example.
S1, aiming at XX reservoir rocks in a certain area of a Hongkong oilfield, selecting 4 early strong-glue type rock samples, drilling, cutting and polishing to obtain rock samples with the diameter of 2.5cm and the length of 4cm, washing the rock samples with oil, and removing residual crude oil in the rock samples; drying the rock sample at 60 deg.C for 2 days to remove residual water, and testing porosity phi of the rock sample by gas measurement0And permeability K0The specific physical property data are shown in Table 1.
TABLE 1
| Numbering | Rock sample 1 | Rock sample 2 | Rock sample 3 | Rock sample 4 |
| φ0/％ | 2.66 | 4.14 | 4.97 | 5.63 |
| K0/10-3μm2 | 0.008 | 0.031 | 0.036 | 0.051 |
S2, placing the rock sample into a 50ml beaker at normal temperature, adding an acetic acid solution with the concentration of 0.3% into the beaker until the rock sample is immersed, standing for 1 hour, replacing the acetic acid solution, repeating the above process until no bubbles emerge from the rock sample, and taking a picture of the rock sample after the rock sample is corroded as shown in FIG. 2.
S3, washing the rock sample for several times by deionized water, drying the rock sample for 2 days at the temperature of 60 ℃, removing residual water in the rock sample, and testing the porosity phi of the rock sample by using a gas measuring method1And permeability K1The resulting porosity phi was tested1And permeability K1Namely the physical property of the reservoir before the cementing action occurs, and the physical property data of the rock sample after corrosion are shown in the table 2.
TABLE 2
| Numbering | Rock sample 1 | Rock sample 2 | Rock sample 3 | Rock sample 4 |
| φ1/％ | 30.97 | 34.64 | 32.7 | 33.6 |
| K1/10-3μm2 | 1020.982 | 3244.263 | 1047.097 | 2974.045 |
S4, selecting non-corroded rock samples for each rock sample, grinding rock slices with the thickness of 30 mu m, dyeing the rock slices, selecting 10 representative visual fields for each rock slice by using a microscope and an image analysis system matched with the microscope, and counting the area S occupied by the dyed calcite cement in the rock slices1Calculating the total area S of 10 views2Using the formula S ═ S1/S2X 100% meterA photograph of the non-eroded portion of the rock slice is shown in fig. 3, calculated as the two-dimensional area ratio of the rock filled with calcite cement.
S5 porosity φ obtained from each rock sample0Permeability K0Porosity phi of the porous material1Permeability K1Area S1And total area S2Fitting the porosity difference phi1-φ0Difference K in permeability from S1-K0The quantitative function relationship with the two-dimensional area ratio S of the rock is shown in a functional relationship diagram in figure 4.
And S6, quantitatively recovering the ancient physical properties before early strong cementation according to the quantitative functional relation on the basis of the area proportion delineation of the cementate.
In order to more clearly illustrate the advantages of the method, the method and the prior 'inversion stripping method' are used for obtaining the paleness of the rock sample for the same rock sample, the paleness result of the rock sample obtained by the two methods is shown in figure 5, and the paleness porosity obtained by the method for determining the physical property of the sandstone reservoir before the cementing action is performed is phi1Ancient permeability of K1The ancient porosity calculated by the existing 'inversion stripping method' is phi2Ancient permeability of K2. As can be seen from fig. 5, for the same rock sample, there is a significant difference between the paleo-porosity and paleo-permeability obtained by the two methods. The method for determining the physical property of the sandstone reservoir before the cementing action occurs directly measures the physical property of the sandstone before the cementing action occurs, effectively avoids the artificial influence in the counting and calculating processes, has higher porosity as a whole, or is obtained by melting carbonate cement in fine pores, is more consistent with the actual geological condition, and has more accurate result.
The above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are possible within the spirit and scope of the claims.
Claims (5)
1. Sand for determining cementing action before occurrenceThe method for physical property of the rock reservoir is characterized by comprising the following specific steps: aiming at a sandstone reservoir, taking a plurality of early strong-glue type rock samples, pretreating each rock sample to obtain a rock sample with the diameter of 2.5cm and the length of 4cm, and removing residual crude oil in the rock sample; drying the rock sample to remove residual water in the rock sample, and testing the porosity phi of the rock sample0And permeability K0；
Placing the rock sample into a beaker at normal temperature, adding an acetic acid solution with the concentration of 0.3% into the beaker until the rock sample is immersed, standing for 1 hour, replacing the acetic acid solution, and repeating the process until no bubbles emerge from the rock sample;
washing the rock sample with deionized water for several times, drying the rock sample to remove residual water in the rock sample, and testing the porosity phi of the rock sample1And permeability K1The resulting porosity phi was tested1And permeability K1Namely the physical property of the reservoir before the cementing action occurs.
2. The method of determining the physical properties of a sandstone reservoir before consolidation according to claim 1, wherein the rock sample eroded by the acetic acid solution is tested, further comprising the following steps:
selecting non-corroded rock samples for each rock sample, grinding rock slices with the thickness of 30 mu m, dyeing the rock slices, selecting 10 representative visual fields for each rock slice by using a microscope and an image analysis system matched with the microscope, and counting the area S occupied by the dyed calcite cement in the rock slices1Calculating the total area S of 10 views2Using the formula S ═ S1/S2Calculating the two-dimensional area ratio of rocks filled with the calcite cement by multiplying 100%;
porosity phi obtained from multiple rock samples0Permeability K0Porosity phi of the porous material1Permeability K1Area S1And total area S2Fitting the porosity difference phi1-φ0Difference K in permeability from S1-K0A quantitative functional relationship with the two-dimensional area ratio S of the rock;
and quantitatively recovering the ancient physical properties before the early strong cementation according to the quantitative functional relation on the basis of the area ratio delineation of the cementate.
3. The method of determining the physical properties of a sandstone reservoir before consolidation according to claim 2, wherein the rock slice is dyed with rubicin and potassium ferricyanide solution.
4. A method of determining the physical properties of a sandstone reservoir before consolidation occurs as claimed in claim 1 or 2, wherein the pre-treatment of each rock sample comprises drilling, cutting and grinding.
5. A method of determining the physical properties of a sandstone reservoir before consolidation as claimed in claim 1 or 2 wherein the rock sample is dried at 60 ℃ for 2 days to remove residual water from the rock sample.
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