GB2540228A - Stratigraphic correlation method and apparatus based on uncertainty - Google Patents
Stratigraphic correlation method and apparatus based on uncertainty Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000004048 modification Effects 0.000 claims description 4
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- 238000003908 quality control method Methods 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 23
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013076 uncertainty analysis Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V20/00—Geomodelling in general
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V11/00—Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V99/00—Subject matter not provided for in other groups of this subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2200/00—Details of seismic or acoustic prospecting or detecting in general
- G01V2200/10—Miscellaneous details
- G01V2200/14—Quality control
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2210/00—Details of seismic processing or analysis
- G01V2210/60—Analysis
- G01V2210/66—Subsurface modeling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2210/00—Details of seismic processing or analysis
- G01V2210/60—Analysis
- G01V2210/66—Subsurface modeling
- G01V2210/667—Determining confidence or uncertainty in parameters
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Abstract
A method of stratigraphic correlation comprises determining S101 a plurality of possible correlation positions in a well with uncertain layered position in a profile. A qualitative or quantitative certainty value is assigned S102 to the plurality of correlation positions. The plurality of possible correlation positions and certainty values are stored and displayed S103 as different layered solutions on the profile. By setting a plurality of position solutions for a layer all possibilities of the layered position judged by geological personnel can be recorded as references for subsequent correlation of other profiles, the closing of the whole layered solution, and quality control.
Description
STRATIGRAPHIC CORRELATION METHOD AND APPARATUS
BASED ON UNCERTAINTY
Field of the Invention
The present invention relates to technologies of performing stratigraphic correlation through uncertainty, and particularly, to a stratigraphic correlation method and apparatus based on uncertainty.
Background of the Invention
In a stratigraphic correlation process using well logging curves, the following problems usually appear: the layered position of a layer is uncertain in a well, a layer has inconsistent positions in different profiles through the same well, etc. Regarding those problems, the prior arts often determine a layered position by experiences, and then confirm it in the subsequent correlation or closing check. But when the layer is complex, the number of the layered wells is huge, and the layered position has a high interpretation ambiguity, phenomena such as mistake, omission, repetition, and even difficulty in closing will easily occur in the subsequent check, thus the reliability of the layering result decreases, which further affects the subsequent geological works.
Summary of the Invention
The embodiments of the present invention provide a stratigraphic correlation method and apparatus based on uncertainty, to record all possibilities of the layered position judged by the geological personnel as references for the subsequent correlation of other profiles, the closing of the whole layered solution, and the quality control.
In order to achieve the above object, the embodiments of the present invention provide a stratigraphic correlation method based on uncertainty, comprising: determining a plurality of possible correlation positions in a well with uncertain layered position in a profile, in a stratigraphic correlation process; assigning a qualitative or quantitative certainty value to the plurality of correlation positions; and storing and displaying the plurality of correlation positions and certainty values thereof as different layered solutions on the profile, respectively.
In one embodiment, the stratigraphic correlation method further comprises: displaying the correlation position and the certainty value of the well in the current profile, respectively, when other profile passes through the well.
In one embodiment, the stratigraphic correlation method further comprises: modifying the certainty value of the layered solution according to a correlation result of the current profile.
In one embodiment, the stratigraphic correlation method further comprises: adding a new layered solution according to a con-elation result of the current profile and determining a certainty value thereof.
In one embodiment, after stratigraphic correlations of all Wells are completed, a certainty contour map is obtained by interpolation according to a certainty value of each layered solution at well points.
In one embodiment, after stratigraphic correlations of all wells are completed, a most possible certainty contour map for each layer is obtained by interpolation according to a layered solution corresponding to a maximum certainty value of the layer:
In one embodiment, after layers in all wells are closed, an average certainty value of all wells in each layered solution or an average maximum certainty value of all wells in each layer is counted.
In order to achieve the above object, the embodiments of the present invention further provide a stratigraphic correlation apparatus based on uncertainty, comprising: a position determination unit configured to determine a plurality of possible correlation positions in a well with uncertain layered position in a profile, in a stratigraphic correlation process; an assignment unit configured to assign a qualitative or quantitative certainty value to the plurality of correlation positions; and a display unit configured to store and display the plurality of correlation positions and certainty values thereof as different layered solutions on the profile, respectively.
In one embodiment, the display unit is further configured to display the correlation position and the certainty value of the well in the current profile, respectively, when other profile passes through the well.
In one embodiment, the stratigraphic correlation apparatus further comprises a modification unit configured to modify the certainty value of the layered solution according to a correlation result of the current profile.
In one embodiment, the stratigraphic correlation apparatus further comprises a solution addition unit configured to add a new layered solution according to a correlation result of the current profile and determine a certainty value thereof.
In one embodiment, the stratigraphic correlation apparatus further comprises a first interpolation unit configured to obtain a certainty contour map by interpolation according to a certainty value of each layered solution at well points, after stratigraphic correlations of all wells are completed.
In one embodiment, the stratigraphic correlation apparatus further comprises a second interpolation unit configured to obtain a most possible certainty contour map for each layer by interpolation according to a layered solution corresponding to a maximum certainty value of the layer, after stratigraphic correlations of all wells are completed.
In one embodiment, the stratigraphic correlation apparatus further comprises a counting unit configured to count an average certainty value of all wells in each layered solution or an average maximum certainty value of all wells in each layer, after all wells are closed.
The embodiments of the present invention have the following beneficial effects: (1) By setting a plurality of position solutions for a layer, all possibilities of the layered position judged by the geological personnel can be recorded as references for the subsequent correlation of other profiles, the closing of the whole layered solution, and the quality control. (2) By setting an accuracy for each position solution, the possibility of each solution can be determined and recorded, thereby further facilitating the subsequent correlation of profiles and the quality control of the whole layered solution. (3) By making a contour map for certainties of each layer, a well with a higher uncertainty can be quickly found in the process of the layer correlation, so that the closing and the quality control are more targeted, and the closing efficiency is greatly improved. (4) By recording certainty data in the layering process, a data basis can be provided for the final uncertainty analysis, thus it is possible to quantize the uncertainty in the stratigraphic correlation, which solves the problem that the stratigraphic correlation uncertainty is difficult to be quantized. (5) By implementation of the method of the invention, the workload of closing and quality control at the later stage can be greatly reduced while the workload in the layering process at the earlier stage is slightly increased. In addition, the layering result is more accurate and reliable, and the working efficiency is improved.
Brief Description of the Drawings
In order to more clearly describe the technical solutions in the embodiments of the present invention or the prior art, accompanying drawings to be used in the descriptions of the embodiments or the prior art will be briefly introduced as follows. Obviously, the accompanying drawings in the following descriptions just illustrate some embodiments of the present invention, and a person skilled in the art can obtain other accompanying drawings from them without paying any creative effort.
Fig. 1 is a flowchart of a stratigraphic correlation method based on uncertainty in an embodiment of the present invention;
Fig. 2 is a schematic diagram of a cross section profile passing through a north-south direction of well 2 in an embodiment of the present invention;
Fig. 3 is a schematic diagram of a cross section profile passing through an east-west direction of well 2 in an embodiment of the present invention;
Fig. 4 is a schematic diagram of a contour map of certainty in solution 1 of 5 layer B in an embodiment of the present invention;
Fig. 5 is a schematic diagram of a contour map of certainty in solution 2 of 5 layer B in an embodiment of the present invention;
Fig. 6 is a histogram of distribution of average certainty of each layer in an embodiment of the present invention;
Fig. 7 is a structural block diagram of a stratigraphic correlation apparatus based on uncertainty in an embodiment of the present invention;
Fig. 8 is a structural block diagram of a stratigraphic correlation apparatus based on uncertainty in an embodiment of the present invention;
Fig. 9 is a structural block diagram of a stratigraphic correlation apparatus based on uncertainty in an embodiment of the present invention;
Fig. 10 is a structural block diagram of a stratigraphic correlation apparatus based on uncertainty in an embodiment of the present invention;
Fig. 11 is a structural block diagram of a stratigraphic correlation apparatus based on uncertainty in an embodiment of the present invention.
Detailed Description of the Preferred Embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described as follows with reference to the accompanying drawings of the embodiments of the present invention. Obviously, those described herein are just parts of the embodiments of the present invention rather than all the embodiments. Based on the embodiments of the present invention, any other embodiment obtained by a person skilled in the art without paying any creative effort shall fall within the protection scope of the present invention.
The embodiments of the present invention provide a stratigraphic correlation method based on uncertainty. As illustrated in Fig. 1, the stratigraphic correlation method comprises: SI01: determining a plurality of possible correlation positions in a well with uncertain layered position in a profile, in a stratigraphic correlation process; SI02: assigning a qualitative or quantitative certainty value to the plurality of correlation positions.
In the stratigraphic correlation process, when the layered position of a well is uncertain, several possible correlation positions may be set in the well, and a qualitative (high, medium and low) or quantitative (10%, 50% and 80%) certainty value may be assigned to each position. SI03: storing and displaying the plurality of correlation positions and certainty values thereof as different layered solutions on the profile, respectively.
As can be seen from the flow of Fig. 1, in the stratigraphic correlation process, the present invention firstly determines a plurality of possible correlation positions in a well with uncertain layered position in a profile, in a stratigraphic correlation process, then assigns a qualitative or quantitative certainty value to the plurality of correlation positions, and finally stores and displays the plurality of correlation positions and certainty values thereof as different layered solutions on the profile, respectively.
After the flow of Fig. 1, in the stratigraphic correlation process, other profile usually shall be analyzed, and when other profile (also referred to as the current profile) passes through the well with uncertain position in Fig. 1, the correlation position and the certainty value of the well shall be displayed in the current profile, respectively. A correlation result of the layered correlation is generated in the current profile, and the present invention can modify the certainty value of the layered solution according to the correlation result of the current profile, or add a new layered solution according to the correlation result of the current profile and determine a certainty value thereof.
After analyses of a plurality of profiles, the stratigraphic correlations of all the wells can be completed. Next, a certainty contour· map can be obtained by interpolation according to the certainty value of each layered solution at the well points. After the stratigraphic correlations of all the wells are completed, the most possible certainty contour map for each layer can be obtained by interpolation according to a layered solution corresponding to a maximum certainty value of the layer.
After the certainty contour map is obtained by interpolation, the position of a well with poor certainty (less than a predetermined value that is set upon actual conditions) can be found according to the contour map, and making a new cross section profile through the well, so as to further determine the layered position and update corresponding certainty. The detailed processing method is shown in the flow of Fig. 1.
Regarding a layer having multiple layered solutions with slightly-different certainties and still difficult to be determined in subsequent closing and quality control works, it may be analyzed separately in another possible layered solution.
In one embodiment, after all the wells are closed (the same well is adaptive to be layered in any profile), an average certainty value of all the wells in each layered solution or an average maximum certainty value of all the wells in each layer can be counted.
In addition, if the certainty of a solution cannot be judged for a layer, a plurality of cross section profiles can be made through the well, and the most possible layered position is marked on each profile, finally, the certainty of each layered position is automatically assigned by counting occurrence frequency of the layer at each position.
Next, the stratigraphic correlation method based on uncertainty in the embodiment of the present invention will be exemplarily described in details with reference to the accompanying drawings.
Fig. 2 is a schematic diagram of a cross section profile passing through a north-south direction of well 2. As illustrated in Fig. 2, the profile orderly passes through the well logging curve charts 1 to 3 of wells 1 to 3 from north to south. Assuming that the segment of curve can be divided into three layers, i.e., 4 layer A, 5 layer B and 6 layer C, according to the given stratigraphic framework. From the variation trend of the gamma curve and the resistivity curve in the well logging chart, the position of each layer in wells 1 and 3 and the positions of 4 layer A and 6 layer C in well 2 can be determined. The certainty can be directly assigned with 1 without being considered specially. Due to the curve variation, there are two layered solutions for 5 layer B in well 2, and it is difficult to determine which layered solution is more accurate. Thus certainties 21 and 22 are artificially assigned with 0.5 and 0.5 of the two layered solutions 51 and 52 in well 2.
Fig. 3 is a schematic diagram of a cross section profile passing through an east-west direction of well 2 in an embodiment of the present invention. In Fig. 3, the profile orderly passes through the well logging curve charts 2, 7 and 8 of wells 2, 5 and 8 from west to east. From the variation trend of the well logging curve near 5 layer B in well 5, it can be deemed that the solution for 52 layer B2 of 5 layer B is more possible. Thus certainties 71 and 72 are artificially assigned with 0.1 and 0.9 of the two layered solutions 51 and 52 in well 5. From the well logging curve trend of well 5, it also can be predicted that solution 52 of 5 layer B is more possible in well 2. Thus certainty 22 is artificially modified into 0.8, and certainty 21 is deceased to be 0.2.
Fig. 4 is a schematic diagram of a contour map of certainty in solution 1 of 5 layer B in an embodiment of the present invention. As illustrated in Fig. 4, assuming that nine wells are distributed at the positions illustrated in Fig. 4 and they have a certainty of 1 at each layer except those illustrated in Figs. 2 and 3, then the distribution rule of the solution of 51 layer B1 can be obtained by interpolation in a minimum curvature method. From the distribution diagram, the uncertainty distribution situation of the solution of 51 layer B1 can be acquired, and the positions of wells 2 and 5 with higher uncertainties can be quickly determined. When the number of wells in the studied region is large, and the layer division is ambiguous, the function of the distribution diagram is especially useful.
Fig. 5 is a schematic diagram of a contour map of certainty in solution 2 of 5 layer B in an embodiment of the present invention. The uncertainty distribution situation of the solution of 52 layer B2 is also given by the schematic diagram of the certainty contour map in solution 2 of 5 layer B in Fig. 5. Generally, the uncertainties of layered solutions associated with each other in different wells also tend to be uniform. Thus if merely the most possible solution of 5 layer B is considered, an interpolation may be made to the schematic diagram of a horizontal distribution by taking the maximum value of the certainty of 5 layer B.
Fig. 6 is a histogram of distribution of average certainty of each layer in an embodiment of the present invention. In Fig. 6, by calculating the average certainty of each layer in all the wells, the uncertainty of each layer can be intuitively presented, and a most possible layered solution may be screened out from uncertain layered solutions.
The embodiments of the present invention further provide a stratigraphic correlation apparatus based on uncertainty. As illustrated in Fig. 7, the stratigraphic correlation apparatus comprises: a position determination unit 701, an assignment unit 702 and a display unit 703.
In the stratigraphic correlation process, the position determination unit 701 is configured to determine a plurality of possible correlation positions in a well with uncertain layered position in a profile;
The assignment unit 702 is configured to assign a qualitative or quantitative certainty value to the plurality of correlation positions.
The display unit 703 is configured to store and display the plurality of correlation positions and certainty values thereof as different layered solutions on the profile, respectively.
In one embodiment, when other profile passes through the well, the display unit 703 is further configured to display the correlation position and the certainty value of the well in the current profile, respectively.
In one embodiment, as illustrated in Fig. 8, the stratigraphic correlation apparatus further comprises: a modification unit 801 and a solution addition unit 802. The modification unit 801 is configured to modify the certainty value of the layered solution according to the correlation result of the current profile; and the solution addition unit 802 is configured to add a new layered solution according to the correlation result of the current profile and determine a certainty value thereof.
In one embodiment, as illustrated in Fig. 9, the stratigraphic correlation apparatus further comprises: a first interpolation unit 901. After the stratigraphic correlations of all the wells are completed, the first interpolation unit 901 may obtain a certainty contour map by interpolation according to the certainty value of each layered solution at the well points.
In one embodiment, as illustrated in Fig. 10, the stratigraphic correlation apparatus further comprises a second interpolation unit 1001. After the stratigraphic correlations of all the wells are completed, the second interpolation unit 1001 may obtain the most possible certainty contour map for each layer by interpolation according to a layered solution corresponding to a maximum certainty value of the layer.
In one embodiment, as illustrated in Fig. 11, the stratigraphic correlation apparatus further comprises a counting unit 1101. After all the wells are closed, the counting unit 1101 counts an average certainty value of all the wells in each layered solution or an average maximum certainty value of all the wells in each layer.
The embodiments of the present invention have the following beneficial effects: (1) By setting a plurality of position solutions for a layer, all possibilities of the layered position judged by the geological personnel can be recorded as references for the subsequent correlation of other profiles, the closing of the whole layered solution, and the quality control. (2) By setting an accuracy for each position solution, the possibility of each solution can be determined and recorded, thereby further facilitating the subsequent correlation of profiles and the quality control of the whole layered solution. (3) By making a certainty contour map for each layer, a well with a higher uncertainty can be quickly found in the process of the layer correlation, so that the closing and the quality control are more targeted, and the closing efficiency is greatly improved. (4) By recording certainty data in the layering process, a data basis can be provided for the final uncertainty analysis, thus it is possible to quantize the uncertainty in the stratigraphic correlation, which solves the problem that the stratigraphic correlation uncertainty is difficult to be quantized. (5) By implementation of the method of the invention, the workload of closing and quality control at the later stage can be greatly reduced while the workload in the layering process at the earlier stage is slightly increased. In addition, the layering result is more accurate and reliable, and the working efficiency is improved. A person skilled in the art shall appreciate that the embodiments of the present invention may be provided as a method, a system, or a computer program product. Thus the present invention may adopt the form of complete hardware embodiment, complete software embodiment, or software and hardware combined embodiment. In addition, the present invention may adopt the form of a computer program product which is implementable in one or more computer readable storage mediums (including, but not limited to, magnetic disk memory, CD-ROM, optical memory, etc.) containing computer readable program codes therein.
The present invention is described with reference to the flowcharts and/or block diagrams of the method, device (system) and computer program product according to the embodiments of the present invention. It shall be appreciated that each flow and/or block in the flowchart and/or block diagram, and the combinations of the flows and/or blocks in the flowchart and/or block diagram can be implemented through computer program instructions. The computer program instructions may be provided to a general computer, a dedicated computer, an embedded processor or a processor of other programmable data processing device, to form a machine so that the instructions, which are executed through the computer or the processor of other programmable data processing device, generate means for realizing the functions specified in one or more flows in the flowchart and one or more blocks in the block diagram.
The computer program instructions may also be stored in a computer readable memory which is capable of guiding the computer or other programmable data processing device to work in a specific mode, so that the instructions stored in the computer readable memory generate a product including instructing means for realizing the functions specified in one or more flows in the flowchart and one or more blocks in the block diagram.
The computer program instructions may also be loaded to the computer or other programmable data processing device, so that a series of operation steps can be performed in the computer or other programmable device to generate a processing realized by the computer, thus the instructions executed in the computer or other programmable device provide the steps for realizing the functions specified in one or more flows in the flowchart and one or more blocks in the block diagram.
The principle and embodiments of the present invention are described through the specific embodiments, but the above descriptions of the embodiments just promote the understanding of the method and the core idea of the present invention. Meanwhile, a person skilled in the art can modify the embodiments and the application range according to the idea of the present invention. In summary, the content of the Specification shall not be understood as limitations to the present invention.
Claims (10)
1. A stratigraphic correlation method based on uncertainty, comprising: determining a plurality of possible correlation positions in a well with uncertain layered position in a profile, in a stratigraphic correlation process; assigning a qualitative or quantitative certainty value to the plurality of correlation positions; and storing and displaying the plurality of correlation positions and certainty values thereof as different layered solutions on the profile, respectively; wherein after stratigraphic correlations of all wells are completed, a most possible certainty contour map for each layer is obtained by interpolation according to a layered solution corresponding to a maximum certainty value of the layer; after all wells are closed, an average certainty value of all wells in each layered solution or an average maximum certainty value of all wells in each layer is counted; after the certainty contour map is obtained by interpolation, the position of a well with poor certainty can be found according to the contour map, and making a new cross section profile through the well, so as to further determine the layered position and update corresponding certainty.
2. The stratigraphic correlation method based on uncertainty according to claim 1, further comprising: displaying the correlation position and the certainty value of the well in other profiles, respectively, when the profiles cross the well.
3. The stratigraphic correlation method based on uncertainty according to claim 2, further comprising: modifying the certainty value of layered solution according to a correlation result of the profiles.
4. The stratigraphic correlation method based on uncertainty according to claim 2 or 3, further comprising: adding a new layered solution according to a correlation result of the profiles and determining a certainty value thereof.
5. The stratigraphic correlation method based on uncertainty according to claim 4, wherein after stratigraphic correlations of all wells are completed, a certainty contour map is obtained by interpolation according to a certainty value of each layered solution at well points.
6. A stratigraphic correlation apparatus based on uncertainty, comprising: a position determination unit configured to determine a plurality of possible correlation positions in a well with uncertain layered position in a profile, in a stratigraphic correlation process; an assignment unit configured to assign a qualitative or quantitative certainty value to the plurality of correlation positions; and a display unit configured to store and display the plurality of correlation positions and certainty values thereof as different layered solutions on the profile, respectively; a second interpolation unit configured to obtain a most possible certainty contour map for each layer by interpolation according to a layered solution corresponding to a maximum certainty value of the layer, after stratigraphic correlations of all wells are completed; a counting unit configured to count an average certainty value of all wells in each layered solution or an average maximum certainty value of all wells in each layer, after all wells are closed; after the certainty contour map is obtained by interpolation, the position of a well with poor certainty can be found according to the contour map, and making a new cross section profile through the well, so as to further determine the layered position and update corresponding certainty.
7. The stratigraphic correlation apparatus based on uncertainty according to claim 6, wherein the display unit is further configured to display the correlation position and the certainty value of the well in other profiles, respectively, when the profiles cross the well.
8. The stratigraphic correlation apparatus based on uncertainty according to claim 7, further comprising a modification unit configured to modify the certainty value of layered solution according to a correlation result of the profiles.
9. The stratigraphic correlation apparatus based on uncertainty according to claim 7 or 8, further comprising a solution addition unit configured to add a new layered solution according to a correlation result of the profiles and determine a certainty value thereof.
10. The stratigraphic correlation apparatus based on uncertainty according to claim 9, further comprising a first interpolation unit configured to obtain a certainty contour map by interpolation according to a certainty value of each layered solution at well points, after stratigraphic correlations of all wells are completed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510379359.9A CN105089658B (en) | 2015-07-01 | 2015-07-01 | Stratum contrast method and device based on uncertainty |
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| GB201523055D0 GB201523055D0 (en) | 2016-02-10 |
| GB2540228A true GB2540228A (en) | 2017-01-11 |
| GB2540228B GB2540228B (en) | 2017-05-10 |
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| US (1) | US20170002643A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| GB2540228B (en) | 2017-05-10 |
| GB201523055D0 (en) | 2016-02-10 |
| CN105089658A (en) | 2015-11-25 |
| US20170002643A1 (en) | 2017-01-05 |
| CN105089658B (en) | 2018-04-06 |
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