CN114462113A - Concealed river depicting method and device based on amplitude ratio, electronic equipment and medium - Google Patents
Concealed river depicting method and device based on amplitude ratio, electronic equipment and medium Download PDFInfo
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- CN114462113A CN114462113A CN202011133189.3A CN202011133189A CN114462113A CN 114462113 A CN114462113 A CN 114462113A CN 202011133189 A CN202011133189 A CN 202011133189A CN 114462113 A CN114462113 A CN 114462113A
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Abstract
The invention provides a hidden river channel depicting method, a hidden river channel depicting device, electronic equipment and a hidden river channel depicting medium based on an amplitude ratio, which can be used for hidden river channel identification in a fluvial facies reservoir development area. The depicting method comprises the following steps: establishing an isochronous stratigraphic framework, and explaining two sets of top and bottom horizons of the isochronous stratigraphic framework based on the post-stack seismic data; extracting seismic data between the top and bottom two sets of horizons in the original post-stack seismic data as a new seismic data volume; calculating the ratio of the wave trough amplitude energy at the river channel development position to the surrounding rock amplitude energy on the river channel development position based on the new seismic data body to obtain an amplitude ratio attribute; and depicting a hidden river channel based on the amplitude ratio attribute. The invention is based on an isochronous stratum framework, and forms an amplitude ratio attribute by calculating the ratio of the trough energy at the river channel development position to the surrounding rock amplitude energy on the trough energy, so that the hidden river channel which is difficult to identify by the conventional root-mean-square attribute can be effectively described.
Description
Technical Field
The invention belongs to the field of oil exploration, and particularly relates to a concealed river channel carving method based on an amplitude ratio, a carving device, electronic equipment and a medium.
Background
Covert channels are channel sandstone reservoirs with relatively "bright spot" channels where the reflection characteristics are not apparent in seismic sections. The 'bright spot' river channel has good reservoir physical properties, and the wave impedance of the sandstone reservoir of the river channel is obviously different from the wave impedance of surrounding rocks, so that the river channel has strong wave valley reflection characteristics in an earthquake section. The influence of reservoir physical properties and other factors on the river channel is concealed, the wave impedance of the sandstone reservoir of the river channel is smaller than the wave impedance of surrounding rocks, and the wave impedance is characterized by weak wave valley reflection in an earthquake section. When the conventional earthquake attribute is used for depicting the plane form of the river channel, the trough energy at the development position of the river channel is used as an identification standard to obtain a plane attribute graph, and the concealed river channel is difficult to identify due to weak reflection energy.
Therefore, a channel characterization method for channel sandstone, which can simultaneously identify strong-amplitude and weak-amplitude seismic response characteristics, is urgently needed in the field.
Disclosure of Invention
The invention aims to establish a new seismic attribute so that the sandstone of a river channel with strong amplitude and weak amplitude seismic response characteristics can be identified simultaneously.
The method is based on the isochronous stratum framework, calculates the ratio of the trough energy at the river channel development position to the surrounding rock amplitude energy on the trough energy, eliminates the influence factors that the hidden river channel is difficult to identify on the plane due to weak amplitude energy, and achieves the purpose of effectively depicting the hidden river channel.
According to one aspect of the invention, the hidden river channel characterization method based on the amplitude ratio comprises the following steps:
establishing an isochronous stratigraphic framework, and explaining two sets of top and bottom horizons of the isochronous stratigraphic framework based on the post-stack seismic data;
extracting seismic data between the top and bottom two sets of horizons in the original post-stack seismic data as a new seismic data volume;
calculating the ratio of the wave trough amplitude at the river channel development position to the surrounding rock amplitude on the river channel development position based on the new seismic data body to obtain an amplitude ratio attribute;
and depicting a hidden river channel based on the amplitude ratio attribute.
Further, the seismic data between the top set of horizon and the bottom set of horizon are depositional bodies in the same period.
Further, the new seismic data volume includes at least one peak and one valley in the longitudinal direction.
Further, the obtaining amplitude ratio attributes includes processing the new seismic data volume twice:
the first processing retains seismic data representing surrounding rock;
the second process retains seismic data representing a river reservoir.
Further, the amplitude value which is less than or equal to 0 in the new seismic data volume is removed in the first processing to obtain a first data volume;
and the second processing eliminates the amplitude value which is greater than or equal to 0 in the new seismic data body to obtain a second data body.
And further, respectively taking the top and bottom two sets of layers as the top and bottom, and extracting root mean square amplitude attributes of the first data body and the second data body to obtain first amplitude energy and second amplitude energy.
Further, the amplitude ratio property is a ratio of the first amplitude energy to a second amplitude energy.
According to another aspect of the present invention, there is provided a covert river characterization device based on amplitude ratio, comprising:
the horizon dividing unit is used for establishing an isochronous stratigraphic framework and explaining two sets of horizons at the top and the bottom of the isochronous stratigraphic framework based on the post-stack seismic data;
the data extraction unit is used for extracting seismic data between the top set of horizon and the bottom set of horizon in the original post-stack seismic data to serve as a new seismic data volume;
the ratio calculation unit is used for calculating the ratio of the wave trough amplitude energy at the river channel development position to the surrounding rock amplitude energy on the river channel development position based on the new seismic data body to obtain an amplitude ratio attribute;
and the river channel carving unit is used for carving and hiding the river channel based on the amplitude ratio attribute.
According to another aspect of the present invention, there is provided an electronic apparatus including:
a memory storing executable instructions;
a processor executing the executable instructions in the memory to implement the amplitude ratio-based covert river characterization method.
According to another aspect of the present invention, a computer-readable storage medium is provided, which stores a computer program, and the computer program is executed by a processor to implement the hidden river channel characterization method based on amplitude ratio.
The invention provides a hidden river channel carving method based on an amplitude ratio. The method is based on the isochronous stratum framework, and calculates the ratio of the wave trough energy at the river channel development position to the overlying surrounding rock amplitude energy, so as to carve the concealed river channel. The invention can effectively depict the hidden river channel and the 'bright spot' river channel at the same time.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in greater detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
FIG. 1 is a flow chart of a covert river characterization method based on amplitude ratio according to the present invention.
Fig. 2 is a flow chart of a method according to an embodiment of the invention.
FIG. 3 is a post-stack seismic data horizon interpretation profile according to an embodiment of the invention.
FIG. 4 is a diagram of original inter-layer root mean square amplitude properties according to an embodiment of the invention.
FIG. 5 is an amplitude ratio plane property diagram according to an embodiment of the invention.
Detailed Description
Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure 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 disclosure to those skilled in the art.
The invention provides a hidden river channel depicting method based on an amplitude ratio, which can be used for hidden river channel identification in a fluvial facies reservoir development area. The invention is based on an isochronous stratum framework, and forms an amplitude ratio attribute by calculating the ratio of the trough energy at the river channel development position to the surrounding rock amplitude energy on the trough energy, so that the hidden river channel which is difficult to identify by the conventional root-mean-square attribute can be effectively described.
As shown in fig. 1, the present invention provides a covert river characterization method based on amplitude ratio, which includes:
establishing an isochronous stratigraphic framework, and explaining two sets of top and bottom horizons of the isochronous stratigraphic framework based on the post-stack seismic data;
extracting seismic data between the top and bottom two sets of horizons in the original post-stack seismic data as a new seismic data volume;
calculating the ratio of the wave trough amplitude at the river channel development position to the surrounding rock amplitude on the river channel development position based on the new seismic data body to obtain an amplitude ratio attribute;
and depicting a hidden river channel based on the amplitude ratio attribute.
Specifically, an isochronous stratigraphic grid is first established. The method comprises the steps of establishing an isochronous stratum framework mainly based on a logging interpretation result, dividing a plurality of geological layers aiming at a target layer when geologists interpret logging data, then corresponding the geological layers and seismic data in-phase axes based on synthetic record calibration, and further performing horizon interpretation, wherein the framework formed by the same geological layers among different wells is the isochronous stratum framework. And then, explaining top and bottom two sets of horizons (top and bottom) of the isochronal stratum trellis based on the post-stack seismic data, and ensuring that a sedimentary body at the same time is arranged between the two sets of horizon data.
Next, the original post-stack data is processed based on two sets of horizons (top, bottom), and only the post-stack seismic data between the horizons, seis _ origin, is retained as a new seismic data volume.
And processing the new seismic data body seis _ origin data twice, wherein the amplitude value of the new seismic data body seis _ origin data is removed in the first processing, so that a first data body seis _ peak (seismic data representing surrounding rocks are reserved) is obtained, and the amplitude value of the new seismic data body seis removed in the second processing, so that a second data body seis _ trough (seismic data representing a river reservoir are reserved) is obtained.
Based on the above processing results, with the top and bottom two sets of horizons (top, bottom) as top and bottom, respectively, extracting root mean square amplitude attributes from the first data body is _ peak and the second data body is _ gauge of the data bodies, and obtaining a first amplitude attribute _ peak and a second amplitude attribute _ gauge.
And finally, making result to attribute _ peak/attribute _ strong, and finally identifying the riverway sandstone with strong amplitude and weak amplitude seismic response characteristics. For conventional seismic attributes such as maximum valley attributes, the maximum valley amplitude of a target layer is extracted, and a hidden river channel is pressed by the strong amplitude of a bright spot river channel on a plan view due to the fact that the maximum valley energy is weak, and is difficult to identify. The method for calculating the amplitude ratio can eliminate the influence, because the energy of the overlying strata of the bright spot river channel is very strong, the energy of the trough of the concealed river channel is weak, and the energy of the overlying strata is also not strong, the amplitude ratio of the bright spot river channel to the concealed river channel after the amplitude ratio processing is carried out is easy to identify on the same order of magnitude.
Preferably, the optimal threshold value is combined with the known river channel information to obtain better identification effect. The amplitude ratio attribute is also a seismic attribute, and as with the conventional seismic attribute, each region or sediment body has a different threshold, and the river channel can be described more clearly by using a proper threshold. Conventionally, a threshold range is determined through a known river channel, and a value range is adjusted on a plane graph to achieve a better prediction effect.
To facilitate understanding of the solution of the embodiments of the present invention and the effects thereof, specific application examples are given below. It will be understood by those skilled in the art that this example is merely for the purpose of facilitating an understanding of the present invention and that any specific details thereof are not intended to limit the invention in any way.
Practice ofExample 1
Fig. 2 shows a specific flow of the covert river channel characterization method based on amplitude ratio according to the present invention. The invention will be further described with reference to the following examples and with reference to the accompanying drawings.
Firstly, an isochronous stratigraphic framework is established based on the geological knowledge of an actual work area, and two sets of top and bottom horizons (top and bottom) of a geologic body in the same deposition period are explained based on post-stack seismic data by taking the isochronous stratigraphic framework as a reference (see fig. 3), and fig. 3 shows a channel sediment body developed at a trough.
Then, extracting the seismic data between the top and bottom two sets of horizons (top and bottom) in the original post-stack seismic data as a new seismic data body seis _ origin, wherein the new seismic data body seis _ origin must include a peak and a trough in the longitudinal direction.
Next, the new seismic data volume sei _ origin is processed twice, the amplitude value less than or equal to 0 in the data volume is removed in the first processing to obtain the data volume sei _ peak (seismic data representing surrounding rocks are reserved), and the amplitude value greater than or equal to 0 in the data volume is removed in the second processing to obtain the data volume sei _ trough (seismic data representing river channel reservoirs are reserved). And obtaining peak seismic data and trough seismic data through two times of processing.
Next, the peak seismic data and the trough seismic data are processed separately. Specifically, for the data body sei _ peak and the data body sei _ trough, the top and bottom two sets of horizons (top and bottom) are used as the top and bottom, and root-mean-square amplitude attributes attribute _ peak and attribute _ trough between layers are respectively extracted to obtain a peak root-mean-square amplitude and a trough root-mean-square amplitude.
Finally, the amplitude ratio is calculated. Specifically, let result be equal to attribute _ peak/attribute _ strong, the obtained amplitude ratio plane attribute can identify the channel sandstone with strong amplitude and weak amplitude seismic response characteristics at the same time.
Fig. 4 is an original inter-layer root-mean-square amplitude attribute, fig. 5 is an amplitude ratio plane attribute, and it can be found through comparison that a river channel is developed very obviously in the lower right in fig. 4, a river channel developed in the middle is not obvious, and no river channel is displayed on the left side, and in fig. 5, not only is the river channel response characteristic developed very obviously in the lower right, but also the river channel contour developed in the middle is very clear, and a river channel contour is also shown on the left side, which shows that the method has a significant effect in the aspect of hiding river channel engraving.
Example 2
This embodiment provides a hidden river depicting device based on amplitude ratio, includes:
the horizon dividing unit is used for establishing an isochronous stratigraphic framework and explaining two sets of horizons at the top and the bottom of the isochronous stratigraphic framework based on the post-stack seismic data;
the data extraction unit is used for extracting seismic data between the top set of horizon and the bottom set of horizon in the original post-stack seismic data to serve as a new seismic data volume;
the ratio calculation unit is used for calculating the ratio of the wave trough amplitude energy at the river channel development position to the surrounding rock amplitude energy on the river channel development position based on the new seismic data body to obtain an amplitude ratio attribute;
and the river channel carving unit is used for carving and hiding the river channel based on the amplitude ratio attribute.
The horizon division unit, the data extraction unit, the ratio calculation unit and the river channel characterization unit are sequentially in communication connection. The horizon dividing unit is used for establishing an isochronous stratigraphic framework, explaining two sets of top and bottom horizons (top and bottom) of the geologic body in the same deposition period by taking the isochronous stratigraphic framework as a reference, and the data extracting unit is used for extracting seismic data between the two sets of top and bottom horizons in the original post-stack seismic data. The ratio calculating unit calculates the ratio of the wave trough amplitude energy at the river channel development position to the surrounding rock amplitude energy on the river channel development position based on the extracted seismic data, and the river channel depicting unit depicts the hidden river channel by utilizing the amplitude ratio.
Example 3
The present disclosure provides an electronic device including: a memory storing executable instructions; and the processor executes the executable instructions in the memory to realize the diffraction identification imaging method.
An electronic device according to an embodiment of the present disclosure includes a memory and a processor.
The memory is to store non-transitory computer readable instructions. In particular, the memory may include one or more computer program products that may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. The volatile memory may include, for example, Random Access Memory (RAM), cache memory (cache), and/or the like. The non-volatile memory may include, for example, Read Only Memory (ROM), hard disk, flash memory, etc.
The processor may be a Central Processing Unit (CPU) or other form of processing unit having data processing capabilities and/or instruction execution capabilities, and may control other components in the electronic device to perform desired functions. In one embodiment of the disclosure, the processor is configured to execute the computer readable instructions stored in the memory.
Those skilled in the art should understand that, in order to solve the technical problem of how to obtain a good user experience, the present embodiment may also include well-known structures such as a communication bus, an interface, and the like, and these well-known structures should also be included in the protection scope of the present disclosure.
For the detailed description of the present embodiment, reference may be made to the corresponding descriptions in the foregoing embodiments, which are not repeated herein.
Example 4
Embodiments of the present disclosure provide a computer-readable storage medium storing a computer program which, when executed by a processor, implements the diffraction identification imaging method.
A computer-readable storage medium according to an embodiment of the present disclosure has non-transitory computer-readable instructions stored thereon. The non-transitory computer readable instructions, when executed by a processor, perform all or a portion of the steps of the methods of the embodiments of the disclosure previously described.
The computer-readable storage media include, but are not limited to: optical storage media (e.g., CD-ROMs and DVDs), magneto-optical storage media (e.g., MOs), magnetic storage media (e.g., magnetic tapes or removable disks), media with built-in rewritable non-volatile memory (e.g., memory cards), and media with built-in ROMs (e.g., ROM cartridges).
It will be appreciated by persons skilled in the art that the above description of embodiments of the invention is intended only to illustrate the benefits of embodiments of the invention and is not intended to limit embodiments of the invention to any examples given.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not 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 described embodiments.
Claims (10)
1. A hidden river channel depicting method based on amplitude ratio is characterized by comprising the following steps:
establishing an isochronous stratigraphic framework, and explaining two sets of top and bottom horizons of the isochronous stratigraphic framework based on the post-stack seismic data;
extracting seismic data between the top and bottom two sets of horizons in the original post-stack seismic data as a new seismic data volume;
calculating the ratio of the wave trough amplitude at the river channel development position to the surrounding rock amplitude on the river channel development position based on the new seismic data body to obtain an amplitude ratio attribute;
and depicting a hidden river channel based on the amplitude ratio attribute.
2. The amplitude ratio-based covert channel delineation method of claim 1, wherein the seismic data between the top and bottom sets of horizons is a same-time sediment.
3. The amplitude ratio-based covert channel delineation method of claim 1, wherein said new seismic data volume comprises at least one peak and one valley in the longitudinal direction.
4. The amplitude ratio-based covert channel delineation method of claim 1, wherein said obtaining amplitude ratio attributes comprises processing said new seismic data volume twice:
the first processing retains seismic data representing surrounding rocks;
the second process retains seismic data representing a river reservoir.
5. The amplitude ratio-based covert channel delineation method of claim 4, wherein said first processing removes amplitude values less than or equal to 0 in the new seismic data volume to obtain a first data volume;
and the second processing eliminates the amplitude value which is greater than or equal to 0 in the new seismic data body to obtain a second data body.
6. The hidden riverway characterization method based on amplitude ratios as claimed in claim 5, wherein the top and bottom sets of layers are taken as top and bottom, respectively, and root mean square amplitude attributes are extracted from the first data volume and the second data volume to obtain a first amplitude and a second amplitude.
7. The amplitude ratio-based covert channel characterization method of claim 6, wherein said amplitude ratio attribute is a ratio of said first amplitude to a second amplitude.
8. The utility model provides a conceal river depicting device based on amplitude ratio which characterized in that includes:
the horizon dividing unit is used for establishing an isochronous stratigraphic framework and explaining two sets of horizons at the top and the bottom of the isochronous stratigraphic framework based on the post-stack seismic data;
the data extraction unit is used for extracting seismic data between the top set of horizon and the bottom set of horizon in the original post-stack seismic data to serve as a new seismic data volume;
the ratio calculation unit is used for calculating the ratio of the wave trough amplitude energy at the river channel development position to the surrounding rock amplitude energy on the river channel development position based on the new seismic data body to obtain an amplitude ratio attribute;
and the river channel carving unit is used for carving and hiding the river channel based on the amplitude ratio attribute.
9. An electronic device, characterized in that the electronic device comprises:
a memory storing executable instructions;
a processor executing the executable instructions in the memory to implement the amplitude ratio-based covert river characterization method of any one of claims 1-7.
10. A computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement the concealed river characterization method based on amplitude ratio according to any one of claims 1-7.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115932968A (en) * | 2023-01-09 | 2023-04-07 | 西南石油大学 | Carbonate rock thin reservoir prediction method based on seismic amplitude ratio attribute |
| WO2024060427A1 (en) * | 2022-09-22 | 2024-03-28 | 中国石油天然气股份有限公司 | River channel and fault synchronous test method and apparatus |
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2020
- 2020-10-21 CN CN202011133189.3A patent/CN114462113A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024060427A1 (en) * | 2022-09-22 | 2024-03-28 | 中国石油天然气股份有限公司 | River channel and fault synchronous test method and apparatus |
| CN115932968A (en) * | 2023-01-09 | 2023-04-07 | 西南石油大学 | Carbonate rock thin reservoir prediction method based on seismic amplitude ratio attribute |
| CN115932968B (en) * | 2023-01-09 | 2023-07-18 | 西南石油大学 | Carbonate rock thin reservoir prediction method based on seismic amplitude ratio attribute |
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