CN111122823B - Rock core analysis saturation correction method and device and readable storage medium - Google Patents
Rock core analysis saturation correction method and device and readable storage medium Download PDFInfo
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Abstract
The invention discloses a core analysis saturation correction method, which comprises the following steps: obtaining a corresponding relation between an oil-water two-phase relative permeability ratio value and the actually measured water saturation and the actually measured oil saturation of the rock core through an oil-water relative permeability experiment; obtaining the corresponding relation between the relative permeability of the oil phase and the water phase and the correction value of the oil saturation and the correction value of the water saturation; obtaining the oil content measurement saturation and the water content measurement saturation after the volatile quantity correction through simultaneous operation; and normalizing the oil saturation and the water saturation after the volatile quantity correction to obtain a final oil saturation correction value and a final water saturation correction value. And comprehensively correcting the volatilization degassing error and the system error by using the phase permeation data, so that the correction of the saturation degree is more in line with the real situation of the stratum. The problem that the traditional method normalizes the trend line to obtain the saturation similar to the original oil layer and ignores the difference of fluid volatility is solved.
Description
Technical Field
The invention belongs to the field of scientific application of core experimental data in petroleum exploration, and relates to a method and a device for correcting saturation of core analysis and a readable storage medium.
Background
Oil-water saturation data is an important parameter in oil field exploration and development research, and one of the methods for obtaining the original oil reservoir saturation is a coring calibration method: and (4) measuring saturation data through the ground, comprehensively considering various errors, and correcting the data into the original oil reservoir saturation. Errors in measured and true values fall into two categories according to fluid influencing factors: first, a system error independent of fluid properties; the second is degassing volatility error associated with fluid properties.
At present, although the sum of the saturation of the surface oil and the saturation of the water mentioned by the traditional linear regression saturation correction method is lower than 100%, the saturation distribution is not disordered and still has better correlation. The method for correcting the oil-water saturation data is derived in a linear regression mode, and the method has the greatest advantages that coring data are fully utilized, and the operation is convenient.
However, the method has two disadvantages, one is that the slope of the trend line fitted by all the original measurement sample points is assumed to be the same as the slope of the trend line under the original formation condition, and only the normalized translation of the measurement trend line is completed; secondly, the loss error formed by the residual rate of oil and water is taken as a system error to be processed more coarsely, and an obvious unreasonable place exists; these two points result in large errors in the final oil-water saturation and actual values.
Disclosure of Invention
The invention aims to overcome the defect that the oil-water saturation and actual value error obtained finally by the existing correction method in the prior art is large, and provides a rock core analysis saturation correction method, a rock core analysis saturation correction device and a readable storage medium.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a core analysis saturation correction method comprises the following steps:
s101: obtaining a corresponding relation between an oil-water two-phase relative permeability ratio value and the actually measured water saturation and the actually measured oil saturation of the rock core through an oil-water relative permeability experiment; obtaining the corresponding relation between the relative permeability of the oil phase and the water phase and the correction value of the oil saturation and the correction value of the water saturation;
s102: obtaining the oil content measurement saturation and the water content measurement saturation after the volatile content is corrected by the corresponding relation between the ratio of the relative permeability of the two phases of oil and water, the actually measured water saturation of the rock core and the actually measured oil saturation of the rock core and the corresponding relation between the relative permeability of the two phases of oil and water, the correction value of the oil saturation and the correction value of the water saturation;
s103: and normalizing the oil saturation and the water saturation after the volatile quantity correction to obtain a final oil saturation correction value and a final water saturation correction value.
The core analysis saturation correction method is further improved as follows:
the corresponding relation between the oil-water relative permeability ratio and the oil-water saturation measurement value in the S101 is as shown in the formula (1):
wherein, K ro Relative permeability of the oil phase, K rw Is the relative permeability of the aqueous phase, S' w And measuring the water saturation for the rock core.
The correspondence relationship between the relative permeability of the oil and water phases and the correction value of the oil and water saturation in the S101 is an expression (2):
wherein, delta S o As correction of oil saturation, Δ S w Is water saturation correction amount, S' w Actually measured water saturation, S 'of rock core' O For actually measuring the oil saturation, K, of the rock core ro Relative permeability of the oil phase, K rw Relative permeability of the aqueous phase, B o Is the volume coefficient of oil, B w Volume coefficient of water,. Mu. o Is the viscosity of the oil, mu w The viscosity of water.
The specific method of S102 is as follows:
obtaining an oil saturation volatility correction value delta S through the corresponding relation between the ratio of the relative permeability of the two phases of oil and water, the actually-measured water saturation of the rock core and the actually-measured oil saturation of the rock core and the corresponding relation between the relative permeability of the two phases of oil and water, the oil saturation correction value and the water saturation correction value o And water saturation volatility correction amount deltas w ；
Obtaining the saturated S of the oil-containing measurement after the volatile content correction through the formula (3) o ‘ r ：
S′ or ＝S′ or +ΔS o (3)
Obtaining oil content measurement saturated S 'after volatile content correction by the formula (4)' wr ：
S‘ wr ＝S′ w +ΔS w (4)
Wherein, S' w Actually measured water saturation, S 'of rock core' O And measuring the oil saturation of the rock core.
The specific method of S103 is as follows:
s104-1: the correspondence relationship between the remaining rate α of oil and the remaining rate β of water is obtained by equation (5):
wherein, S' w Actually measured water saturation, S 'of rock core' O Actually measuring the oil saturation of the rock core;
s104-2: actually measured water saturation S 'of rock core' w And actually measured oil saturation degree S 'of rock core' o Linear regression was performed to obtain formula (6):
S′ w ＝a+bS′ o (6)
coupled (3) and (4), resulting in a = β,
s104-3: the oil-water measurement saturation after the volatile quantity correction is normalized through (7), and a final oil saturation correction value S is obtained o And corrected value S of water saturation w ：
Wherein, S' or Measurement of saturation, S ', for oil content corrected for volatility' wr The saturation was measured for the water content after the volatile amount correction.
In another aspect of the present invention, a core analysis saturation correction apparatus includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the core analysis saturation correction method when executing the computer program.
In yet another aspect of the present disclosure, a computer-readable storage medium stores a computer program which, when executed by a processor, performs the steps of the above-described core saturation correction method.
Compared with the prior art, the invention has the following beneficial effects:
obtaining a corresponding relation between an oil-water two-phase relative permeability ratio value and the actually measured water saturation and the actually measured oil saturation of the rock core through an oil-water relative permeability experiment; the method comprises the steps of obtaining a corresponding relation between the relative permeability of oil and water phases and the correction value of oil saturation and the correction value of water saturation, further establishing the two corresponding relations to obtain a volatilization correction value, realizing the correction of volatilization and degassing errors of core analysis saturation, realizing the correction of system errors of core analysis saturation through normalized linear fitting processing, and comprehensively considering the system errors and the volatilization and degassing errors, so that the correction of the saturation is more consistent with the real situation of a stratum, and effectively solving the problem that the traditional linear regression method obtains the saturation similar to an original oil layer through the linear fitting of the ground core saturation and ignores the difference of fluid volatility, thereby causing larger errors.
Drawings
FIG. 1 is a flow chart of a core analysis saturation correction method of the present disclosure;
FIG. 2 is a cross plot of oil and water saturation measured at the surface of a core according to the present invention;
FIG. 3 is a graph of relative permeability of oil and water versus measured water saturation for the present invention;
FIG. 4 is a comparison graph of the core before and after measurement of oil and water saturation volatility correction;
FIG. 5 is a graph of the effect of correcting the oil and water saturation in core measurements.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of the present invention and the above-described drawings, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, a core analysis saturation correction method provided by the embodiment of the present invention includes the following steps:
step 101: and performing linear fitting on the actually measured saturation of the rock core to obtain an oil and water saturation relation and a trend line thereof.
Step 102: and obtaining the corresponding relation between the relative permeability ratio of the oil phase and the water phase and the actually measured water saturation and the actually measured oil saturation of the rock core through an oil-water relative permeability experiment.
Step 103: and obtaining the corresponding relation between the relative permeability of the oil phase and the water phase and the correction value of the oil saturation and the correction value of the water saturation through an oil-water relative permeability experiment.
Step 104: and obtaining the oil content measurement saturation and the water content measurement saturation after the volatility correction through the corresponding relation between the simultaneous oil-water two-phase relative permeability ratio and the actually measured water saturation of the rock core and the actually measured oil saturation of the rock core and the corresponding relation between the oil-water two-phase relative permeability and the oil saturation correction value and the water saturation correction value, and finishing the volatility correction and the reduction of the trend line slope.
Step 105: and (4) performing system error correction on the oil-water saturation value after the volatile amount is corrected to enable the oil-water saturation value to meet the normalization condition, and finally obtaining the original oil reservoir oil-water saturation value.
The following describes the embodiments of the present invention in further detail to support the technical problems to be solved by the present invention.
A certain target research block is selected, experimental data are divided into 3 groups according to different wells and different coring batches, and the 3 groups of oil and water saturation data have 1 main characteristic due to different seepage capacities of oil and water two-phase fluids, namely the slopes of trend lines are different but close to-1, as shown in figure 2.
Performing linear fitting on the actually measured saturation of the rock core to obtain an oil and water saturation relation and a trend line thereof, and a volatilization correction value delta S of the oil and the water o 、ΔS w The relation between the measured saturation and the measured saturation before and after correction specifically refers to:
S‘ wr ＝S′ w +ΔS w ，S′ or ＝S′ or +ΔS o (1)
in the formula: s' or Measurement of saturation, S ', for oil content corrected for volatility' wr Measuring the saturation, decimal, for the water cut after the volatile correction; delta S o Is the correction value of oil saturation volatility, delta S w The correction value of the water saturation volatilization is decimal.
And (3) obtaining a relational expression between the relative permeability of the oil phase and the water phase and the oil-water saturation correction value by combining the phase permeation experimental data, specifically:
in the formula,. DELTA.S o As correction of oil saturation, Δ S w Is a water saturation correction value, S' w Actually measured water saturation, S 'of rock core' O For actually measuring the oil saturation, K, of the rock core ro Relative permeability of the oil phase, K rw Relative permeability of the aqueous phase, B o Is the volume coefficient of oil, B w Volume coefficient of water,. Mu. o Is the viscosity of the oil, mu w The viscosity of water. Wherein B is o 、B w 、μ o And mu w The TVB experimental data of the reservoir of the target block in the research area are obtained, and the values are 1.22, 1.1, 3.47 and 0.6172.
Establishing a relation between the relative permeability ratio of the oil phase and the water phase and the measured value of the oil saturation, as shown in fig. 3, and obtaining a relational expression:
in the formula, K ro 、K rw Is oil-water relative permeability, S' w Decimal fraction for measuring water saturation.
Calculating the relation between the oil-water saturation measurement value and the oil-water phase permeability in the combined formula (2) and the combined formula (3) to obtain delta S o 、ΔS w And S' wr 、S′ or The calculation results are shown in table 1, and the volatilization correction and the reduction of the trend line slope are completed. The volatilization amount of oil and water can be seenThe sum of saturations at the original formation conditions increases and the slope of the trend line changes, as shown in fig. 4.
TABLE 1. DELTA.S o 、ΔS w And S' wr 、S′ or Table of calculation results of
And (4) performing system error correction on the oil-water saturation value after the volatile quantity is corrected to enable the oil-water saturation value to meet the normalization condition, and finally obtaining the original oil reservoir oil-water saturation value.
(1) Assuming that the residual rates of oil and water are respectively alpha and beta, the rock core measured on the ground has the oil and water saturation conforming to the following formula:
converting into the following steps:
combining the regression formula after the volatilization correction of the group 1 to obtain: α =95.166 and β =95.413. In the same way, the correction coefficients of other groups of data are obtained.
(2) According to experimental data, for S' w 、S′ o Linear regression was performed to obtain:
S′ w ＝a+bS′ o (6)
in the formulae, a and b are correction coefficients, and are shown in formulae (5) and (6):
(3) Fitting through a first set of data to obtain oil and water correction coefficients:
thus, the oil and water saturation corrections for the set 1 measurements are:
similarly, the oil and water saturation of the other 2 groups after correction can be obtained, and the correction results are shown in table 2, so that the maximum error before the total ground saturation is corrected is 61.7%, the value is basically equal to 100% after 2 steps of correction, and the comparison results before and after correction are shown in fig. 5.
TABLE 2 correction results table
In an exemplary embodiment, a computer readable storage medium is also provided, which stores a computer program that, when executed by a processor, implements the steps of the core analysis saturation correction method. The computer storage medium may be any available medium or data storage device that can be accessed by a computer, including but not limited to magnetic memory (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical memory (e.g., CD, DVD, BD, HVD, etc.), and semiconductor memory (e.g., ROM, EPROM, EEPROM, nonvolatile memory (NANDFLASH), solid State Disk (SSD)), etc. In an exemplary embodiment, there is also provided a core analysis saturation correction apparatus including a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the core analysis saturation correction method when executing the computer program. The processor may be a Central Processing Unit (CPU), other general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, etc.
According to the core analysis saturation correction method provided by the invention, for the oil-water saturation of other core analysis in a research area, the comprehensive correction of the volatilization degassing error and the system error is carried out by using the phase permeability data through an improved correction method, so that the correction of the saturation is more consistent with the real situation of the stratum. The problem caused by the fact that the traditional linear regression method obtains the saturation similar to the original oil layer through the linear fitting of the ground core saturation and the normalization processing of the trend line and ignores the difference of the fluid volatility is solved.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (5)
1. A core analysis saturation correction method is characterized by comprising the following steps:
s101: performing linear fitting on the actually measured saturation of the rock core to obtain an oil and water saturation relation and a trend line thereof; obtaining a corresponding relation between an oil-water two-phase relative permeability ratio value and the actually measured water saturation and the actually measured oil saturation of the rock core through an oil-water relative permeability experiment; obtaining the corresponding relation between the relative permeability of the oil phase and the water phase and the correction value of the oil saturation and the correction value of the water saturation;
the correspondence relationship between the relative permeability of the oil and water phases and the correction value of the oil and water saturation in the S101 is an expression (2):
wherein, delta S o As correction of oil saturation, Δ S w Is water saturation correction amount, S' w Is a coreActually measured water saturation degree S' O For actually measuring the oil saturation, K, of the rock core ro Relative permeability of the oil phase, K rw Relative permeability of the aqueous phase, B o Is the volume coefficient of oil, B w Volume coefficient of water,. Mu. o Is the viscosity of the oil, mu w Is the viscosity of water, wherein B o 、B w 、μ o And mu w Obtaining TVB experimental data of the reservoir of the target block of the research area;
s102: obtaining the oil content measurement saturation and the water content measurement saturation after the volatility correction through the corresponding relation between the simultaneous oil-water two-phase relative permeability ratio and the actually measured water saturation of the rock core and the actually measured oil saturation of the rock core and the corresponding relation between the oil-water two-phase relative permeability and the oil saturation correction value and the water saturation correction value;
s103: normalizing the oil saturation and the water saturation after the volatile quantity correction to obtain a final oil saturation correction value and a final water saturation correction value;
the specific method of S103 is as follows:
s104-1: the correspondence relationship between the remaining rate α of oil and the remaining rate β of water is obtained by equation (5):
wherein, S' w Actually measured water saturation, S 'of rock core' O Actually measuring the oil saturation of the rock core;
s104-2: actually measured water saturation S 'of rock core' w And actually measured oil saturation degree S 'of rock core' o Linear regression was performed to obtain formula (6):
S′ w ＝a+bS′ o (6)
coupled (3) and (4), resulting in a = β,
s104-3: oil-water measurement after volatile amount correction by (7)Normalizing the saturation to obtain the final oil saturation correction value S o And a water saturation correction value S w ：
Wherein, S' or Measurement of saturation, S ', for oil content corrected for volatility' wr The saturation was measured for the water content after the volatile amount correction.
2. The method for correcting saturation in core analysis according to claim 1, wherein a correspondence relationship between the relative permeability ratio of oil and water and the measured value of oil and water saturation in S101 is as follows:
wherein, K ro Relative permeability of the oil phase, K rw Is the relative permeability of the aqueous phase, S' w And measuring the water saturation for the rock core.
3. The core analysis saturation correction method according to claim 1, wherein the specific method of S102 is:
obtaining an oil saturation volatility correction value delta S through the corresponding relation between the ratio of the relative permeability of the two phases of oil and water, the actually measured water saturation of the rock core and the actually measured oil saturation of the rock core and the corresponding relation between the relative permeability of the two phases of oil and water, the oil saturation correction value and the water saturation correction value o And water saturation volatility correction amount deltas w ；
Obtaining oil content measurement saturated S 'after volatile content correction by the formula (3)' or ：
S′ or ＝S′ O +ΔS o (3)
Obtaining oil content corrected for volatility from equation (4) to measure saturated S' wr ：
S‘ wr ＝S′ w +ΔS w (4)
Wherein, S' w Actually measured water saturation, S 'of rock core' O And measuring the oil saturation of the rock core.
4. A core analysis saturation correction apparatus comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method according to any one of claims 1 to 3 when executing the computer program.
5. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of a method according to any one of claims 1 to 3.
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