CN114813509A - Compaction correction coefficient determination method for calculating rock porosity by using sound wave time difference - Google Patents
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- 239000011435 rock Substances 0.000 title claims abstract description 118
- 238000005056 compaction Methods 0.000 title claims abstract description 35
- 238000012937 correction Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000012153 distilled water Substances 0.000 claims abstract description 22
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 14
- 239000011148 porous material Substances 0.000 claims description 37
- 238000004364 calculation method Methods 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000011161 development Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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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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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/011—Velocity or travel time
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
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- G01N2291/0232—Glass, ceramics, concrete or stone
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Abstract
The invention discloses a compaction correction coefficient determining method for calculating rock porosity by using sound wave time difference, which is characterized by comprising the following steps of: the porosity is calculated by using the porosity calculated by using the HuaiLi formula according to the longitudinal wave time difference of the dried rock sample as uncompacted sound waves, the porosity is calculated by using the porosity calculated by using the HuaiLi formula according to the longitudinal wave time difference of the rock sample saturated and filled with vacuum distilled water as compacted sound waves, and the compaction correction coefficient determining method for calculating the rock porosity by using the sound wave time difference is established according to the physical relationship between the porosity and the compaction correction coefficient calculated by using the HuaiLi formula in the two states of the rock sample.
Description
Technical Field
The invention belongs to the field of petroleum and natural gas exploration and development, and particularly relates to a compaction correction coefficient determination method for calculating rock porosity by using acoustic time difference.
Background
Rock porosity is an important parameter for underground oil and gas reserves calculation in the field of oil and gas exploration and development, and since the time-averaging formula of the invention of Wyllie (Wyllie), the porosity calculated by sound wave is widely researched and used by academia, and the wye formula for calculating the porosity by sound wave is as follows:
in the formula, phi s The porosity calculated by using the Wyje's formula sound wave is dimensionless; delta t The longitudinal wave time difference, mu s/ft, of the actually measured rock sample; delta tma The longitudinal wave time difference, mu s/ft, of the rock sample framework; delta tf The longitudinal wave time difference of the fluid is μ s/ft.
In practical use, researchers find that the rock porosity calculated by using the HuaiLi formula sound wave is much larger than an actual measurement value, so that the researchers introduce the sound wave time difference to calculate the compaction correction coefficient C of the rock porosity p The relationship after correction is as follows:
in the formula, C p And calculating the compaction correction coefficient of the rock porosity for the sound wave time difference without dimension.
After compaction correction is carried out on the formula for calculating the porosity by the Huaiji formula sound wave, the formula is generally accepted by academic circles and is used in scientific research and project engineering development until now, wherein the most important is the compaction correction coefficient C for calculating the porosity of the rock by sound wave time difference p And (4) determining.
Disclosure of Invention
The invention aims to: the method solves the problem of compaction correction of the porosity calculated by sound waves, and provides a method for determining the compaction correction coefficient by calculating the porosity of the rock by using sound wave time difference.
The technical scheme adopted by the invention is as follows:
a compaction correction coefficient determination method for calculating rock porosity by using acoustic wave time difference comprises the following determination steps:
step 1.1, drying the rock sample at the temperature of 105 ℃ for 72 hours, removing fluid in pores and volatile substances adsorbed on the surfaces of the pores, and then performing sound wave measurement on the dried rock sample to obtain the longitudinal wave time difference delta of the dried rock sample tcd Calculating the acoustic porosity of the dried rock sample by using the HuaiLi formula to obtain the porosity phi of the dried rock sample calculated by using the HuaiLi formula on the basis of the longitudinal wave time difference sd ；
Step 1.2, vacuumizing the rock sample subjected to the step 1.1 to saturate distilled water, filling the pores of the rock sample with distilled water until the weight of the rock sample after water absorption is not increased any more, and then performing sound wave measurement on the rock sample to obtain the longitudinal wave time difference delta of the rock sample with the vacuumized saturated distilled water filled pores tcs Calculating the sound wave porosity of the saturated rock sample with the pores filled with the distilled water by utilizing the HuaiLi formula to obtain the porosity phi calculated by utilizing the HuaiLi formula on the basis of the longitudinal wave time difference of the rock sample with the pores filled with the vacuum distilled water in a saturated manner ss ；
Step 1.3, utilizing longitudinal wave time difference delta of dried rock sample tcd And the longitudinal wave time difference delta of the rock sample with the vacuum saturated distilled water filled pores tcs Porosity, phi, calculated using the Huanli formula, respectively sd And phi ss Obtaining the compaction correction coefficient C of the rock porosity calculated by the sound wave time difference p ：
Further, the specific steps of step 1.3.1 are as follows:
step 1.3.1 porosity phi calculated by using the Huanli formula according to longitudinal wave time difference of the dried rock sample sd Calculating porosity for uncompacted acoustic waves, and calculating porosity phi by using the Wyje's equation according to the longitudinal wave time difference of the rock sample filled with the vacuum-pumping distilled water ss Calculating the porosity for the sound wave after compaction, and obtaining the compaction correction coefficient of the sound wave calculated porosity according to the physical definition of the sound wave compaction correction coefficientC p ：
In the formula, C p Calculating a compaction correction coefficient of the rock porosity for the acoustic time difference, wherein the compaction correction coefficient is dimensionless; phi is a ss The porosity calculated by using the Huaili formula for the longitudinal wave time difference of the vacuum distilled water saturated filling pore rock sample is dimensionless; phi is a sd The porosity calculated by using the HuaiLi formula for the longitudinal wave time difference of the dried rock sample is dimensionless; delta tcs Longitudinal wave time difference (mu s/ft) for filling the pore rock sample with the vacuum saturated distilled water; delta tcd The longitudinal wave time difference of the dried rock sample is mu s/ft; delta tma The longitudinal wave time difference, mu s/ft, of the rock sample framework; delta tf The longitudinal wave time difference of the fluid is μ s/ft.
A compaction correction coefficient determination method for calculating rock porosity by using acoustic time difference comprises the following steps:
drying the rock sample at 105 ℃ for 72 hours to remove fluid in pores and volatile substances adsorbed on the surfaces of the pores, and then performing sound wave measurement on the dried rock sample to obtain the longitudinal wave time difference delta of the dried rock sample tcd Calculating the acoustic porosity of the dried rock sample by using the HuaiLi formula to obtain the porosity phi of the dried rock sample calculated by using the HuaiLi formula on the basis of the longitudinal wave time difference sd ；
Step (2), vacuumizing the rock sample subjected to the step (1) to saturate distilled water, filling the pores of the rock sample with distilled water until the weight of the rock sample after water absorption is not increased any more, and then performing sound wave measurement on the rock sample to obtain the longitudinal wave time difference delta of the rock sample with the holes filled with the vacuumized saturated distilled water tcs Calculating the sound wave porosity of the saturated rock sample with the pores filled with the distilled water by utilizing the HuaiLi formula to obtain the porosity phi calculated by utilizing the HuaiLi formula on the basis of the longitudinal wave time difference of the rock sample with the pores filled with the vacuum distilled water in a saturated manner ss ；
Step (3) utilizing the longitudinal wave time difference delta of the dried rock sample tcd And the longitudinal wave time difference delta of the rock sample with the vacuum saturated distilled water filled pores tcs Porosity, phi, calculated using the Huanli formula, respectively sd And phi ss Obtaining the compaction correction coefficient C of the rock porosity calculated by the sound wave time difference p 。
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
according to the method, the dried rock sample is regarded as a rock sample without an effective medium to fill the pores, the rock sample after being vacuumized and saturated with distilled water is regarded as the pores to be filled, the physical relation between the porosity and the compaction correction coefficient calculated by a longitudinal wave time difference Huanli formula of the rock sample in two states is adopted, and the compaction correction coefficient C for calculating the rock porosity by using the sound wave time difference is determined p 。
Drawings
FIG. 1 is a diagram of basic parameters of a rock sample
FIG. 2 shows the time difference parameters of longitudinal waves of different rock skeletons and fluids
FIG. 3 is a graph of the determination of C according to the present invention p Calculated porosity phi s And measured porosity phi t 1:1 contrast map of
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments, it being understood that the specific embodiments described herein are only for the purpose of explaining the present invention and are not intended to limit the present invention.
A compaction correction coefficient determination method for calculating rock porosity by using acoustic time difference comprises the following steps:
in the formula, phi sd The porosity calculated by using the HuaiLi formula for the longitudinal wave time difference of the dried rock sample is dimensionless; delta tcs Longitudinal wave time difference (mu s/ft) for filling the pore rock sample with the vacuum saturated distilled water; phi is a ss The porosity calculated by using the Huaili formula for the longitudinal wave time difference of the vacuum distilled water saturated filling pore rock sample is dimensionless; delta tcd Is the longitudinal wave time difference of the dried rock sample,μs/ft。
the determination process of the invention is as follows:
filling pores with dry rock samples as effective media, filling the pores with the rock samples after vacuumizing saturated distilled water, and determining a compaction correction coefficient C for calculating the rock porosity by adopting the physical relationship between the porosity and the compaction correction coefficient calculated by a longitudinal wave time difference Huanli formula of the rock samples in two states p 。
The porosity of the dried rock sample is calculated by utilizing the HuaiLi formula, and the calculation formula is as follows:
the porosity of the vacuum distilled water saturated filled pore rock sample is calculated by utilizing the HuaiLi formula, wherein the calculation formula is as follows:
according to the physical significance of the compaction correction coefficient of the porosity calculated by the sound waves, the compaction correction coefficient of the rock porosity calculated by the sound wave time difference can be obtained, and the calculation formula is as follows:
a compaction correction coefficient determination method for calculating rock porosity by using acoustic time difference comprises the following steps:
step 1: drying the rock sample at 105 ℃ for 72 hours, removing fluid in pores and volatile substances adsorbed on the surfaces of the pores, and then performing sound wave measurement on the dried rock sample to obtain the longitudinal wave time difference delta of the dried rock sample tcd Calculating the acoustic porosity of the dried rock sample by using the HuaiLi formula to obtain the porosity phi of the dried rock sample calculated by using the HuaiLi formula on the basis of the longitudinal wave time difference sd ；
Step 2:vacuumizing the rock sample subjected to the step 1 for saturated distilled water, filling the pores of the rock sample with distilled water until the weight of the rock sample after water absorption is not increased any more, and then performing sound wave measurement on the rock sample to obtain the longitudinal wave time difference delta of the rock sample with the vacuumized saturated distilled water filled pores tcs Calculating the sound wave porosity of the saturated rock sample with the pores filled with the distilled water by utilizing the HuaiLi formula to obtain the porosity phi calculated by utilizing the HuaiLi formula on the basis of the longitudinal wave time difference of the rock sample with the pores filled with the vacuum distilled water in a saturated manner ss ；
And step 3: by using the longitudinal wave time difference delta of the dried rock sample tcd And the longitudinal wave time difference delta of the rock sample with the vacuum saturated distilled water filled pores tcs Porosity, phi, calculated using the Huanli formula, respectively sd And phi ss Obtaining the compaction correction coefficient C of the rock porosity calculated by the sound wave time difference p 。
Examples
A compaction correction coefficient determination method for calculating rock porosity by using acoustic time difference comprises the following steps:
in the embodiment, the method provided by the invention is adopted to calculate and check the diagenetic rock samples with different proportions of sandstone frameworks, the basic parameters of the rock samples are shown in figure 1, and the time difference parameters of different rock frameworks and fluid longitudinal waves are shown in figure 2. Determination of C by the invention p Calculated porosity phi s And measured porosity phi t 1:1 comparison of (A) As shown in FIG. 3, the larger R 2 (0.873) and a smaller AAREP (1.88%), illustrating the calculation of the compaction correction factor C for rock porosity using the acoustic moveout proposed by the present invention p The calculation method can be well applied to the porosity calculation of the sound wave, and the prediction precision is high.
Claims (1)
1. A compaction correction coefficient determination method for calculating rock porosity by using acoustic time difference comprises the following steps:
drying the rock sample at 105 ℃ for 72 hours to remove fluid in pores and volatile substances adsorbed on the surfaces of the pores, and then performing sound wave measurement on the dried rock sample to obtain the longitudinal wave time difference delta of the dried rock sample tcd Calculating the stem by using the Huaili formulaObtaining the acoustic wave porosity of the dried rock sample, and calculating the porosity phi of the dried rock sample by using the HuaiLi formula sd The calculation formula is as follows:
in the formula, phi sd The porosity calculated by using the HuaiLi formula for the longitudinal wave time difference of the dried rock sample is dimensionless; delta tcd The longitudinal wave time difference of the dried rock sample is mu s/ft; delta tma The longitudinal wave time difference, mu s/ft, of the rock sample framework; delta tf Is the longitudinal wave time difference of the fluid, mu s/ft;
step (2), vacuumizing the rock sample subjected to the step (1) to saturate distilled water, filling the pores of the rock sample with distilled water until the weight of the rock sample after water absorption is not increased any more, and then performing sound wave measurement on the rock sample to obtain the longitudinal wave time difference delta of the rock sample with the holes filled with the vacuumized saturated distilled water tcs Calculating the sound wave porosity of the saturated rock sample with the pores filled with the distilled water by utilizing the HuaiLi formula to obtain the porosity phi calculated by utilizing the HuaiLi formula on the basis of the longitudinal wave time difference of the rock sample with the pores filled with the vacuum distilled water in a saturated manner ss The calculation formula is as follows:
in the formula, phi ss The porosity calculated by using the Huaili formula for the longitudinal wave time difference of the vacuum distilled water saturated filling pore rock sample is dimensionless; delta tcs Longitudinal wave time difference for filling the pore rock sample with the vacuum saturated distilled water;
step (3) utilizing the longitudinal wave time difference delta of the dried rock sample tcd And the longitudinal wave time difference delta of the rock sample with the vacuum saturated distilled water filled pores tcs Porosity, phi, calculated using the Huanli formula, respectively sd And phi ss Obtaining the compaction correction coefficient C of the rock porosity calculated by the sound wave time difference p The calculation formula is as follows:
in the formula, C p And calculating the compaction correction coefficient of the rock porosity for the sound wave time difference without dimension.
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