CN112630853B - Method and device for correcting gas saturation based on unimpeded flow - Google Patents
Method and device for correcting gas saturation based on unimpeded flow Download PDFInfo
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Abstract
The application discloses a method and a device for correcting gas saturation based on unimpeded flow. The method comprises the following steps: determining a relationship between the unobstructed flow and the gas saturation in the work area based on geological information and engineering prior information; determining a relationship between the unobstructed flow and the estimated value of the saturation of the gas; calculating the gas saturation estimated value of each well according to the unimpeded flow; obtaining an average value of the original gas saturation of each well according to logging data; obtaining a gas saturation correction coefficient of each well based on the gas saturation estimated value and the original gas saturation average value; and correcting the original gas saturation of each well by adopting a gas saturation correction coefficient. According to the application, the gas saturation curve which is consistent with development and production data and geological knowledge can be obtained, the subsequent series of works such as gas content prediction can be effectively guided, and the method has great popularization and application values in gas reservoir development areas.
Description
Technical Field
The invention belongs to the field of petroleum exploration, and particularly relates to a saturation correction method based on unimpeded flow and a saturation correction device based on unimpeded flow.
Background
Gas saturation refers to the percentage of the volume of natural gas in the reservoir that is in the original state in the volume of the interconnected pores. In petroleum exploration, gas saturation is a very important parameter, and has great guiding significance for a series of works such as gas content prediction and the like. At present, the gas saturation is mostly calculated according to an Archie formula, and because parameters such as formation water mineralization degree and the like in the formula are difficult to obtain, logging interpreters can only calculate according to experience, and therefore the gas saturation is often calculated inaccurately.
Therefore, a technical solution capable of obtaining more accurate saturation of gas is needed.
Disclosure of Invention
In view of this, the present application proposes a method capable of correcting the existing saturation of gas. The application also provides a corresponding device.
According to an aspect of the present application, there is provided a method for correcting saturation of gas based on unimpeded flow, the method comprising: determining a relationship between the unobstructed flow and the gas saturation in the work area based on geological information and engineering prior information; determining a relation curve between the unobstructed flow and the estimated value of the gas saturation according to the relation between the unobstructed flow and the gas saturation; calculating the gas saturation estimated value of each well according to the unimpeded flow; obtaining an average value of the original gas saturation of each well according to logging data; obtaining a gas saturation correction coefficient of each well based on the gas saturation estimated value and the original gas saturation average value; and correcting the original gas saturation of each well by adopting a gas saturation correction coefficient.
In one possible embodiment, the method further comprises: and determining whether to correct the original gas saturation according to the relation between the unimpeded flow of each well in the work area and the average value of the original gas saturation.
In one possible embodiment, the determining the relationship between the unobstructed flow and the gas saturation in the work area based on the geological information and the engineering prior information includes: and determining the corresponding value range of the gas saturation when the unobstructed flow is in different value ranges.
In one possible embodiment, the obtaining the raw average gas saturation of each well according to the logging data includes: and (3) arithmetically averaging the original gas saturation measured by the logging data at each sampling point of the target layer for each well to obtain an average value of the original gas saturation.
In one possible embodiment, the determining a relationship between the unobstructed flow rate and the estimated gas saturation value includes: the relationship between the unobstructed flow and the estimated gas saturation is fitted based on the estimated gas saturation as a power function of the unobstructed flow.
According to another aspect of the present application, there is provided a non-resistance flow based gas saturation correction apparatus, the apparatus comprising: the prior information acquisition unit is used for determining the relation between the unimpeded flow and the gas saturation in the work area based on the geological information and the engineering prior information; the relation curve determining unit is used for determining a relation curve between the unimpeded flow and the estimated value of the gas saturation according to the relation between the unimpeded flow and the gas saturation; the estimated value calculation unit is used for calculating the estimated value of the gas saturation of each well according to the unimpeded flow; the original average value calculation unit is used for obtaining an original gas saturation average value of each well according to logging data; the correction coefficient determining unit is used for obtaining the gas saturation correction coefficient of each well based on the gas saturation estimated value and the original gas saturation average value; and the correction unit is used for correcting the original gas saturation of each well by adopting the gas saturation correction coefficient.
In one possible embodiment, the apparatus further comprises: and the data evaluation unit is used for determining whether to correct the original gas saturation according to the relation between the unimpeded flow of each well in the work area and the average value of the original gas saturation.
In a possible implementation manner, the a priori information acquisition unit is specifically configured to: and determining the corresponding value range of the gas saturation when the unobstructed flow is in different value ranges.
In a possible implementation manner, the raw average value calculating unit is specifically configured to: and (3) arithmetically averaging the original gas saturation measured by the logging data at each sampling point of the target layer for each well to obtain an average value of the original gas saturation.
In a possible embodiment, the relation determining unit is specifically configured to: the relationship between the unobstructed flow and the estimated gas saturation is fitted based on the estimated gas saturation as a power function of the unobstructed flow.
According to the method, for the conventional calculation of the gas saturation curve, on the basis of the positive correlation relation between the unimpeded flow and the gas saturation, the mean value correction is carried out under the condition of ensuring that the variance of the gas saturation curve is unchanged, the gas saturation curve which is consistent with development production data and geological knowledge is obtained, the subsequent series of works such as gas content prediction can be effectively guided, and the method has great popularization and application values in gas reservoir development areas.
Drawings
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.
FIG. 1 illustrates a flow chart of a method of correcting for gas saturation based on unobstructed flow according to one embodiment of the application.
Fig. 2 shows a correction path schematic diagram according to an exemplary embodiment of the present application.
FIG. 3 shows a block diagram of a gas saturation correction apparatus based on unobstructed flow according to one embodiment of the present application.
Figure 4 shows a histogram of the unobstructed flow and the original gas saturation of different producing wells for a certain work area prior to correction.
FIG. 5 shows a relationship between unobstructed flow and estimated gas saturation from geological information and engineering a priori information at a work area.
Figure 6 shows a histogram of the unobstructed flow and the gas saturation of different gas producing wells of a work area after correction according to the application.
Detailed Description
Preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.
Please refer to fig. 1. FIG. 1 illustrates a flow chart of a method of correcting for gas saturation based on unobstructed flow according to one embodiment of the application. As shown, the method includes the following steps.
Step 102, determining the relation between the unobstructed flow A and the gas saturation sg in the work area based on geological information and engineering prior information.
The relationship between the unobstructed flow a and the saturation sg of the gas is summarized by the staff of the work area according to the previous experience. The relation between the unobstructed flow A and the gas saturation sg is determined by adopting the experience which is summarized by staff through the long-term exploration and knowledge (namely the knowledge of geological information and engineering prior information) of the work area, so that the obtained relation between the unobstructed flow A and the gas saturation sg can accurately express the actual condition of the work area, and a good foundation is laid for the subsequent correction.
In one possible implementation, step 102 may include determining a corresponding range of values for the saturation of gas sg when the unobstructed flow a is in a different range of values. In other words, the empirically derived relationship between the unobstructed flow rate a and the saturation sg may be a general range correspondence.
Step 104, determining a relation curve between the unobstructed flow A and the estimated value sg_ave of the gas saturation according to the relation between the unobstructed flow A and the saturated value sg of the gas.
In one possible implementation, the relationship between the unobstructed flow a and the gas saturation estimate sg ave may be fitted based on the gas saturation estimate sg ave being a power function of the unobstructed flow a.
Since the unobstructed flow a is the production obtained by open wellhead blowout methods, which can be used to measure the production capacity of gas wells and to make a comparison of the production capacity between producing gas wells, the unobstructed flow a should be positively correlated with the gas saturation sg. On the basis, the inventor further researches and further analyzes the data acquired from a plurality of work areas, and finds that the relation between the two can be expressed more accurately by taking the gas saturation as a power function of the unobstructed flow A. Thus, a relationship curve of the two can be fitted on the basis of this.
And step 106, calculating the estimated gas saturation value sg_ave of each well according to the unimpeded flow A.
For each well, its unobstructed flow A may be brought into the relationship between the unobstructed flow A obtained in step 104 and the estimated gas saturation value sg_ave to obtain the estimated gas saturation value sg_ave for that well.
Step 108, obtaining an original average value sg_ orign _ave of the gas saturation of each well according to the logging data.
In one possible embodiment, the raw gas saturation sg_ orign measured at each sampling point of the target layer for the log data is arithmetically averaged for each well to obtain the raw gas saturation average sg_ orign _ave.
Step 110, obtaining the gas saturation correction coefficient sg_check of each well based on the gas saturation estimated value sg_ave and the original gas saturation average value sg_ orign _ave.
The sg_check=sg_ave-sg_ orign _ave may be given to get the sg_check.
And step 112, correcting the original gas saturation of each well by adopting a gas saturation correction coefficient.
After correcting the original gas saturation, a histogram of the unimpeded flow and the corrected gas saturation of different gas producing wells can be manufactured to confirm that the corresponding relationship between the unimpeded flow and the gas saturation accords with positive correlation.
In the above embodiment, for the conventional calculation of the gas saturation curve, based on the positive correlation between the unimpeded flow and the gas saturation, the average value correction is performed under the condition of ensuring the variance of the gas saturation curve to obtain the gas saturation curve consistent with development and production data and geological knowledge, so as to effectively guide the subsequent series of works such as gas content prediction, and have great popularization and application values in the gas reservoir development area
In one possible implementation, before step 102, it may be determined whether to correct for the saturation of gas sg orign based on a relationship between the unobstructed flow rate a and the saturation of gas sg orign for each well in the work area. For example, histograms of the unobstructed flow a and the original gas saturation average sg_ orign _ave for different producing gas wells may be made, and if the unobstructed flow a and the original gas saturation average sg_ orign _ave are in positive correlation, the original gas saturation sg_ orign may be considered substantially accurate, and no correction may be made; if the two do not meet the positive correlation, the original saturation of gas sg orign may be considered to be erroneous, which may be corrected.
Fig. 2 shows a correction path schematic diagram according to an exemplary embodiment of the present application. As shown, the actual relationship (204) of the unobstructed flow and the gas saturation can be obtained from the geological information of the work area and the engineering prior information (202). The unobstructed flow (206) is brought into the actual relationship of the unobstructed flow and the gas saturation (204), and the estimated gas saturation value sg_ave (208) of each well is obtained. An original saturation mean sg_ orign _ave (212) is obtained from the original saturation (210). The subtraction of both sg_ave (208) and sg_ orign _ave (212) yields the air saturation correction factor sg_check (214). The original gas saturation (210) is corrected using sg_check (214) to obtain corrected gas saturation (216).
FIG. 3 shows a block diagram of a gas saturation correction apparatus based on unobstructed flow according to one embodiment of the present application. As shown, the apparatus includes a priori information acquisition unit 302, a relationship determination unit 304, an estimated value calculation unit 306, an original average calculation unit 308, a correction coefficient determination unit 310, and a correction unit 312.
The prior information acquisition unit 302 is configured to determine a relationship between the unobstructed flow rate and the gas saturation in the work area based on the geological information and the engineering prior information.
The relation determining unit 304 is configured to determine a relation between the unobstructed flow rate and the estimated value of the gas saturation according to a relation between the unobstructed flow rate and the gas saturation.
The estimated value calculation unit 306 is used to calculate the estimated gas saturation value of each well according to the unobstructed flow rate.
The raw average calculation unit 308 is configured to obtain a raw average of the gas saturation of each well from the log data.
The correction factor determining unit 310 is configured to obtain a correction factor of the gas saturation of each well based on the estimated gas saturation value and the average value of the original gas saturation.
The correction unit 312 is used to correct the original gas saturation for each well using a gas saturation correction factor.
In one possible embodiment, the apparatus further comprises: and the data evaluation unit is used for determining whether to correct the original gas saturation according to the relation between the unimpeded flow of each well in the work area and the average value of the original gas saturation.
In a possible implementation manner, the a priori information acquisition unit is specifically configured to: and determining the corresponding value range of the gas saturation when the unobstructed flow is in different value ranges.
In a possible implementation manner, the raw average value calculating unit is specifically configured to: and (3) arithmetically averaging the original gas saturation measured by the logging data at each sampling point of the target layer for each well to obtain an average value of the original gas saturation.
In a possible embodiment, the relation determining unit is specifically configured to: fitting a relationship between the unobstructed flow and the estimated gas saturation based on a power function of the estimated gas saturation as the unobstructed flow
Application example
In this application example, a histogram of unobstructed flow a and original gas saturation sg_ orign for different gas producing wells in the work area is obtained based on the work area logging interpretation results, as shown in fig. 4. As can be seen from fig. 4, the resulting unobstructed flow a is not positively correlated with the gas saturation sg_ orign, and therefore, it is believed that correction of the gas saturation sg_ orign in fig. 2 is required.
In this example, the operator of the work area, through the exploration and understanding of the work area over time and month, considers that the unobstructed flow rate A and the gas saturation sg of the work area have the following relation:
When the unimpeded flow A is more than 10, the gas saturation sg is more than 70 percent;
When 3< no-flow a <10, 55% < gas saturation sg <70%;
when the unobstructed flow A <3, 40% < gas saturation sg <55%.
Based on the above relation and based on the estimated air saturation value sg_ave as the power function of the unobstructed flow rate a, a relation curve between the unobstructed flow rate a and the estimated air saturation value sg_ave (i.e. the air saturation represented by the ordinate in fig. 5) is obtained as shown in fig. 5: sg_ave=32×a 1/6 +20. And then carrying the unobstructed flow A of each well into sg_ave=32×A 1/6 +20 to obtain the estimated value sg_ave of the gas saturation of each well.
In addition, for each well, the raw gas saturation sg_ orign measured by logging data at each sampling point of the target layer is arithmetically averaged to obtain a raw gas saturation average value sg_ orign _ave, and the sg_check=sg_ave-sg_ orign _ave is used to obtain a gas saturation correction coefficient sg_check of each well.
And correcting the original gas saturation sg_ orign of each well by adopting a gas saturation correction coefficient sg_check, so that the average value correction can be performed under the condition of ensuring that the variance of the original gas saturation curve is unchanged. A histogram of the unobstructed flow a and corrected gas saturation sg checked for different producing gas wells can be made based on the correction results, as shown in fig. 6. As can be seen from fig. 6, the corrected gas saturation sg_ checked according to the present application has a good positive correlation with the unobstructed flow a, and accords with geological knowledge.
The present application may be a system, method, and/or computer program product. The computer program product may include a computer readable storage medium having computer readable program instructions embodied thereon for causing a processor to implement aspects of the present application.
The computer readable storage medium may be a tangible device that can hold and store instructions for use by an instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: portable computer disks, hard disks, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static Random Access Memory (SRAM), portable compact disk read-only memory (CD-ROM), digital Versatile Disks (DVD), memory sticks, floppy disks, mechanical coding devices, punch cards or in-groove structures such as punch cards or grooves having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media, as used herein, are not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., optical pulses through fiber optic cables), or electrical signals transmitted through wires.
Various aspects of the present application are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.
The foregoing description of embodiments of the application has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvement of the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (8)
1. A method for correcting saturation of gas based on unobstructed flow, the method comprising:
Determining a relationship between the unobstructed flow and the gas saturation in the work area based on geological information and engineering prior information;
determining a relation curve between the unobstructed flow and the estimated value of the gas saturation according to the relation between the unobstructed flow and the gas saturation;
Calculating the gas saturation estimated value of each well according to the unimpeded flow;
obtaining an average value of the original gas saturation of each well according to logging data;
Obtaining a gas saturation correction coefficient of each well based on the gas saturation estimated value and the original gas saturation average value;
Correcting the original gas saturation of each well by adopting a gas saturation correction coefficient;
wherein the method further comprises:
and determining whether to correct the original gas saturation according to the relation between the unimpeded flow of each well in the work area and the average value of the original gas saturation.
2. The method of claim 1, wherein determining a relationship between unobstructed flow and gas saturation in a work area based on geological information and engineering prior information comprises:
And determining the corresponding value range of the gas saturation when the unobstructed flow is in different value ranges.
3. The method of claim 1, wherein the deriving an average of raw gas saturation for each well from the log data comprises:
and (3) arithmetically averaging the original gas saturation measured by the logging data at each sampling point of the target layer for each well to obtain an average value of the original gas saturation.
4. The method of claim 1, wherein the determining a relationship between the unobstructed flow and the estimate of the gas saturation comprises:
The relationship between the unobstructed flow and the estimated gas saturation is fitted based on the estimated gas saturation as a power function of the unobstructed flow.
5. An unobstructed flow based gas saturation correction device, said device comprising:
The prior information acquisition unit is used for determining the relation between the unimpeded flow and the gas saturation in the work area based on the geological information and the engineering prior information;
The relation curve determining unit is used for determining a relation curve between the unimpeded flow and the estimated value of the gas saturation according to the relation between the unimpeded flow and the gas saturation;
the estimated value calculation unit is used for calculating the estimated value of the gas saturation of each well according to the unimpeded flow;
the original average value calculation unit is used for obtaining an original gas saturation average value of each well according to logging data;
The correction coefficient determining unit is used for obtaining the gas saturation correction coefficient of each well based on the gas saturation estimated value and the original gas saturation average value;
the correction unit is used for correcting the original gas saturation of each well by adopting a gas saturation correction coefficient;
Wherein the apparatus further comprises:
and the data evaluation unit is used for determining whether to correct the original gas saturation according to the relation between the unimpeded flow of each well in the work area and the average value of the original gas saturation.
6. The apparatus according to claim 5, wherein the a priori information acquisition unit is specifically configured to:
And determining the corresponding value range of the gas saturation when the unobstructed flow is in different value ranges.
7. The apparatus according to claim 5, wherein the raw average calculation unit is specifically configured to:
and (3) arithmetically averaging the original gas saturation measured by the logging data at each sampling point of the target layer for each well to obtain an average value of the original gas saturation.
8. The apparatus according to claim 5, wherein the relation determining unit is specifically configured to:
The relationship between the unobstructed flow and the estimated gas saturation is fitted based on the estimated gas saturation as a power function of the unobstructed flow.
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