CN112562075A - Three-dimensional geological modeling method and device for multi-slip-layer structure - Google Patents
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Abstract
The invention provides a three-dimensional geological modeling method and a device for a multi-slippage-layer structure, wherein the method comprises the following steps: performing closed interpretation on the multi-slippage layer structure by using three-dimensional seismic data to obtain fault interpretation data and stratum interpretation data; determining a structural relationship between fault layers according to fault interpretation data, and generating a fracture system model according to the structural relationship; obtaining modeling parameters; the modeling parameters are used for defining the precision or space structure of the three-dimensional geological model; the modeling parameters include at least three of: grid space parameters, tolerance of horizon data to faults and grid search radius; and generating a three-dimensional geological model according to the modeling parameters, the stratum interpretation data and the fracture system model. The method can generate the multi-slip complex-structure three-dimensional geological model with higher accuracy.
Description
Technical Field
The invention relates to the technical field of geophysical exploration, in particular to a three-dimensional geological modeling method and device for a multi-slippage-layer structure.
Background
Oil and gas exploration firstly determines the accurate three-dimensional space form of an underground structure. Due to the existence of multiple slip layers, the complex structure with multiple slip layers can form multiple layers of slip deformation in the structure development process, so that the structure and the fracture are greatly complicated, and meanwhile, due to the plastic deformation of the slip layers, the formation is unevenly thickened and thinned, so that the three-dimensional space geological modeling has great technical problems. The existing structure modeling technology can only realize the geological modeling of a single-slippage-layer rigid stratum deformation structure, and an effective solution is not provided for the three-dimensional space geological modeling of a multi-slippage-layer complex structure.
Disclosure of Invention
The invention provides a multi-slippage-layer-structure three-dimensional geological modeling method and device, which can obtain a more accurate multi-slippage-layer-structure three-dimensional geological model.
In a first aspect, an embodiment of the present invention provides a method for three-dimensional geological modeling of a multi-slip-layer structure, where the method includes: performing closed interpretation on the multi-slippage layer structure by using three-dimensional seismic data to obtain fault interpretation data and stratum interpretation data; determining a structural relationship between fault layers according to the fault interpretation data, and generating a fracture system model according to the structural relationship; obtaining modeling parameters; the modeling parameters are used for defining the precision or spatial structure of the three-dimensional geological model; the modeling parameters include at least three of: grid space parameters, tolerance of horizon data to faults and grid search radius; and generating a three-dimensional geological model according to the modeling parameters, the stratum interpretation data and the fracture system model.
In a second aspect, an embodiment of the present invention further provides a three-dimensional geological modeling apparatus with multiple slip-layer structures, including: the interpretation module is used for carrying out closed interpretation on the multi-slippage layer structure by utilizing three-dimensional seismic data to obtain fault interpretation data and stratum interpretation data; the structural relationship module is used for determining the structural relationship among fault layers according to the fault interpretation data and generating a fracture system model according to the structural relationship; the parameter acquisition module is used for acquiring modeling parameters; the modeling parameters are used for defining the precision or spatial structure of the three-dimensional geological model; the modeling parameters include at least three of: grid space parameters, tolerance of horizon data to faults and grid search radius; and the model generation module is used for generating a three-dimensional geological model according to the modeling parameters, the stratum interpretation data and the fracture system model.
In a third aspect, an embodiment of the present invention further provides a computer device, including a memory and a processor, where the memory stores a computer program operable on the processor, and the processor, when executing the computer program, implements the above-mentioned multi-slippage-layer three-dimensional geological modeling method.
In a fourth aspect, embodiments of the present invention further provide a computer-readable medium having non-volatile program code executable by a processor, the program code causing the processor to execute the above-mentioned multi-slippage-layer-structure three-dimensional geological modeling method.
The embodiment of the invention has the following beneficial effects: the embodiment of the invention provides a three-dimensional geological modeling scheme of a multi-slippage-layer structure, which utilizes three-dimensional seismic data to carry out closed interpretation on the multi-slippage-layer structure so as to obtain more accurate fault interpretation data and stratum interpretation data; and finally, generating the three-dimensional geological model on the basis of the fracture system model according to the modeling parameters and the stratum interpretation data. The embodiment of the invention can generate the multi-slip complex structure three-dimensional geological model with higher accuracy by accurately establishing the structural relation between the complex structure and the fracture on the basis of the three-dimensional seismic interpretation data.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method for three-dimensional geological modeling of a multi-slip layer structure according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a multi-slip-layer complex structure horizon and fault interpretation data according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a fracture system model provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic illustration of a geological model generated with incorrect parameters provided by an embodiment of the present invention;
FIG. 5 is a schematic diagram of a geological model with correct parameter generation provided by an embodiment of the invention;
FIG. 6 is a schematic diagram of a three-dimensional geological model with multiple slip-layers and complex structures according to an embodiment of the invention;
FIG. 7 is a block diagram of a three-dimensional geological modeling apparatus with multi-slip layer structure according to an embodiment of the invention;
fig. 8 is a block diagram of a computer device according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. 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.
At present, the existing three-dimensional geological modeling technology is all directed at a single slip layer rigid deformation structure, the technical difficulty of multi-slip layer structure three-dimensional modeling is far greater than that of a single slip layer rigid deformation structure, and two main problems are highlighted: firstly, a multi-slippage-layer structure fracture system is complex, and a fault structure and a fracture model are difficult to accurately establish; and secondly, uneven change of the thickness of the stratum caused by plastic deformation of the sliding delamination layer is difficult to accurately describe and model in a three-dimensional space, and the two problems are combined together to greatly increase the difficulty of three-dimensional modeling of the multi-sliding delamination structure.
Based on the method and the device for the three-dimensional geological modeling of the multi-slippage-layer structure, provided by the embodiment of the invention, the three-dimensional solid model with the accurate multi-slippage-layer complex structure can be established, the accurate and fine description of the underground structure is realized, and the accurate structural geological data is provided for the structural characteristic research, the fine description of the structure, the hydrocarbon reservoir characteristic research and the hydrocarbon reservoir exploration and development of the multi-slippage-layer complex structure.
To facilitate understanding of the embodiment, the three-dimensional geological modeling method with a multi-slip-layer structure disclosed in the embodiment of the invention is first described in detail.
The embodiment of the invention provides a multi-slip-layer structure three-dimensional geological modeling method, which is shown in a flow chart of the multi-slip-layer structure three-dimensional geological modeling method shown in figure 1 and comprises the following steps:
and S102, performing closed interpretation on the multi-slippage structure by using the three-dimensional seismic data to obtain fault interpretation data and stratum interpretation data.
In the embodiment of the invention, three-dimensional seismic data are used for carrying out full-horizon fine modeling and interpretation on a multi-slippage-layer complex structure, and particularly continuous closed interpretation is carried out on a fault. And (3) finely explaining the top and the bottom of the plastic deformation stratum so as to ensure that fine control and depiction are realized in the subsequent geological modeling process.
Referring to the schematic diagram of the multi-slippage-layer complex structure horizon and fault interpretation data shown in fig. 2, the fault interpretation data and the stratum interpretation data may be represented in a numerical form or in an image form.
It should be noted that the interpretation precision and density of the stratum and the fault can be determined according to the complexity of the multi-slip layer structure, and the more complex the structure is, the higher the interpretation precision and density is, so as to meet the requirement of the subsequent geological modeling.
And step S104, determining the structural relationship among fault layers according to the fault interpretation data, and generating a fracture system model according to the structural relationship.
In the embodiment of the invention, the fault interpretation data comprises time information of fault generation and space size information of faults, and the structural relationship between the faults can be determined according to the fault interpretation data, for example, a parent fault, a child fault, a grandchild fault and the like can be determined. After the structural relationship between the fracture layers is determined, the structural relationship is used as an input of a process for generating a fracture system model, and the fracture system model can be obtained by using the existing model generation program.
Referring to the schematic diagram of the fracture system model shown in fig. 3, it can be known that the fracture system model can be in the form of an image, for example, a three-dimensional map.
And step S106, obtaining modeling parameters.
In the embodiment of the invention, as the geological horizon and fault of the multi-slip-layer complex structure are more, the structure is complex, the modeling data volume is large, the selection of modeling parameters is very sensitive, and if the modeling parameters are not properly selected, modeling errors can be directly caused, and even the dead cycle can be caused. Therefore, preset modeling parameters for defining the precision or spatial structure of the three-dimensional geological model can be obtained to obtain a three-dimensional geological model with higher accuracy. The modeling parameters include at least three of: grid space parameters, tolerance of horizon data to faults, and grid search radius.
Referring to the schematic diagram of the geological model generated by incorrect parameters shown in fig. 4 and the schematic diagram of the geological model generated by correct parameters shown in fig. 5, it can be known that the accuracy of the three-dimensional geological model can be improved by setting appropriate modeling parameters in advance.
It should be noted that, grid space parameters have great influence on the fineness of the model, and are properly selected according to the data density and the construction scale, and too large parameters affect the accuracy of constructing the model, and too small parameters cause modeling errors; the tolerance parameter of the horizon data to the fault controls the spatial relationship between the horizon data and the fault data in the modeling process, and if the parameter is too small or too large, the contact relationship between the horizon and the fault is wrong, and the parameter needs to be selected according to the actual condition of the model. When the modeling parameters are predetermined, whether the modeling parameters are reasonable or not needs to be judged according to analysis of modeling results, and if a correct geological model can be established, the modeling parameters are considered to be reasonable.
And S108, generating a three-dimensional geological model according to the modeling parameters, the stratum interpretation data and the fracture system model.
In the embodiment of the invention, the modeling parameters and the stratum interpretation data can be used as the parameters of the fracture system model, and the fracture system model is adjusted to obtain the three-dimensional geological model. The three-dimensional geological model can be in a numerical form and can also be in an image form. Referring to a schematic diagram of a three-dimensional geological model with multiple slip-layer complex structures shown in fig. 6, the model can accurately and intuitively display the structural modes, structural relationships and zone spreading characteristics of the multiple slip-layer complex structures, and realizes the fine description of the structures in a three-dimensional space.
The embodiment of the invention provides a three-dimensional geological modeling scheme of a multi-slippage-layer structure, which utilizes three-dimensional seismic data to carry out closed interpretation on the multi-slippage-layer structure so as to obtain more accurate fault interpretation data and stratum interpretation data; and finally, generating the three-dimensional geological model on the basis of the fracture system model according to the modeling parameters and the stratum interpretation data. The embodiment of the invention can generate the multi-slip complex structure three-dimensional geological model with higher accuracy by accurately establishing the structural relation between the complex structure and the fracture on the basis of the three-dimensional seismic interpretation data.
In order to build a more accurate fracture system model, the structural relationship between the fault layers is determined according to the fault interpretation data, and the method can be implemented according to the following steps:
(1) determining the sequencing information of the fault according to the time information and the space information of the fault interpretation data;
in the embodiment of the present invention, the time information is used to describe the time when the fault is formed or the time length when the fault exists, and the spatial information may be used to describe the size of the fault or the position of the fault. The new and old faults can be determined according to the time information, so that the faults can be sorted in the order of first new and later old, and the size of the faults can be determined according to the space information, so that the faults can be sorted in the order of first big and then small. And taking the rear faults sequenced according to different rules as sequencing information of the faults.
It should be noted that, one or more sort rules may be used to obtain the sort information of the fault, and specifically, which sort rule is used, and in which order the sort rules are used may be set according to actual needs or experience, which is not specifically limited in the embodiment of the present invention.
(2) And determining the structural relationship among the fault layers according to the sequencing information.
In the embodiment of the invention, the obtained sequencing information can be combined to construct a fault tree so as to construct a structural relationship among fault layers. For example, the construction of the fault tree can follow the principle that a large fracture is firstly constructed, a small fracture is constructed, and a new fracture is constructed, so that a correct cutting relation is formed between the fractures, and the accurate fracture system model is ensured to be established.
On the basis of selecting correct geological modeling parameters, matching calculation is carried out on the layer data and the fault model, and finally a three-dimensional model with a plurality of slippage layers and complex structures is established. The method can be specifically executed according to the following steps:
determining a plurality of build layers from the plurality of slip layers; determining contact relation data of a structural layer according to the modeling parameters, the stratum interpretation data and the fracture system model; and generating a three-dimensional geological model according to the contact relation data and the fracture system model.
In the embodiment of the invention, a plurality of construction layers are formed by taking the sliding layers as boundaries in the multi-sliding-layer complex construction, and data for describing the spatial positions of the construction layers, namely contact relation data, can be calculated according to modeling parameters, stratum interpretation data and a fracture system model. And taking the contact relation data as the adjustment reference data of the fracture system model, and generating a three-dimensional geological model by using a drawing program based on the fracture system model and the contact relation data.
Considering that a plurality of construction layers are formed by taking the slip layers as boundaries due to the complex construction of the plurality of slip layers, the construction modes of the construction layers are quite different, so that the relationship among a plurality of sets of construction layers is difficult to define in the modeling process, and a correct geological model cannot be established. In order to solve the problem, a method for defining a structural relationship in a partitioning mode is needed in the modeling process, the contact relationship of each block is respectively defined according to a model structure, and then integral modeling operation is carried out to obtain a correct three-dimensional geological model. The method can be specifically executed according to the following steps:
acquiring a preset contact relation parameter; the contact relation parameter is used for defining the space position of a fault or a horizon; if the contact relation data of the structural layer is not in the preset contact relation parameter range, adjusting the contact relation data of the structural layer so as to enable the adjusted contact relation data of the structural layer to be in the preset contact relation parameter range; and generating a three-dimensional geological model according to the adjusted contact relation data of the structural layer and the fracture system model.
In an embodiment of the invention, the contact relation parameter is used to define a spatial position range of a fault or a spatial position range of a horizon. The contact relation parameter may be one or more numerical ranges predetermined according to experience or practical needs. In the process of establishing the three-dimensional model with the multi-slippage-layer complex structure, the relation between the contact relation data and the contact relation parameters of the structure layer needs to be judged, and if the contact relation data of the structure layer is not within the preset contact relation parameter range, the contact relation data of the structure layer is adjusted until the whole contact relation data of the structure layer is within the preset contact relation parameter range. And after the adjustment is finished, generating a three-dimensional geological model according to the adjusted contact relation data of the structural layer and the fracture system model.
It should be noted that, the method used for adjusting the contact relationship data may be to change the size or form of the contact relationship data, and may be selected according to actual requirements, which is not specifically limited in the embodiment of the present invention.
The embodiment of the invention provides a three-dimensional geological modeling method for a multi-slip-layer structure, which comprises the following steps of finely interpreting three-dimensional seismic data of a multi-slip-layer complex structure to obtain three-dimensional interpretation data of complex fracture and structure; analyzing the spatial combination relation of the complex fracture, building a correct fault tree, and building a fracture model; and (4) optimizing modeling parameters according to the complex structure characteristics of the multiple slippage layers, and establishing a three-dimensional geological model. The method can be well applied to the research of complex structure of the punched belt. The method can establish the three-dimensional geological model with multiple slip layers and accurate complex structures. By utilizing the geological model, the accurate description of the complex structural characteristics of the fractured zone can be realized, the structural characteristics, the oil and gas reservoir characteristics and the drilling condition of the complex structure can be more accurately researched by utilizing the three-dimensional geological model, and the benefit of exploration and development of the complex structure oil and gas reservoir is improved. The invention can provide favorable technical support for the exploration and development of the large gas field group.
The embodiment of the invention also provides a multi-slip-layer structure three-dimensional geological modeling device, which is shown in a structural block diagram of the multi-slip-layer structure three-dimensional geological modeling device shown in fig. 7 and comprises:
the interpretation module 71 is used for performing closed interpretation on the multi-slippage layer structure by using three-dimensional seismic data to obtain fault interpretation data and stratum interpretation data; the structural relationship module 72 is used for determining the structural relationship among fault layers according to the fault interpretation data and generating a fracture system model according to the structural relationship; a parameter obtaining module 73, configured to obtain modeling parameters; the modeling parameters are used for defining the precision or space structure of the three-dimensional geological model; the modeling parameters include at least three of: grid space parameters, tolerance of horizon data to faults and grid search radius; a model generation module 74 for generating a three-dimensional geological model based on the modeling parameters, the stratigraphic interpretation data, and the fracture system model.
In one embodiment, the structural relationship module is specifically configured to: determining the sequencing information of the fault according to the time information and the space information of the fault interpretation data; and determining the structural relationship among the fault layers according to the sequencing information.
In one embodiment, the model generation module is specifically configured to: determining a plurality of build layers from the plurality of slip layers; determining contact relation data of a structural layer according to the modeling parameters, the stratum interpretation data and the fracture system model; and generating a three-dimensional geological model according to the contact relation data and the fracture system model.
In one embodiment, the model generation module is specifically configured to: acquiring a preset contact relation parameter; the contact relation parameter is used for defining the space position of a fault or a horizon; if the contact relation data of the structural layer is not in the preset contact relation parameter range, adjusting the contact relation data of the structural layer so as to enable the adjusted contact relation data of the structural layer to be in the preset contact relation parameter range; and generating a three-dimensional geological model according to the adjusted contact relation data of the structural layer and the fracture system model.
The embodiment of the present invention further provides a computer device, referring to the schematic block diagram of the structure of the computer device shown in fig. 8, the computer device includes a memory 81 and a processor 82, the memory stores a computer program that can be executed on the processor, and the processor implements the steps of any one of the methods when executing the computer program.
It is clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the computer device described above may refer to the corresponding process in the foregoing method embodiments, and no further description is provided herein
Embodiments of the present invention also provide a computer readable medium having non-volatile program code executable by a processor, the program code causing the processor to perform any of the steps of the above-described method.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A three-dimensional geological modeling method for a multi-slippage-layer structure is characterized by comprising the following steps:
performing closed interpretation on the multi-slippage layer structure by using three-dimensional seismic data to obtain fault interpretation data and stratum interpretation data;
determining a structural relationship between fault layers according to the fault interpretation data, and generating a fracture system model according to the structural relationship;
obtaining modeling parameters; the modeling parameters are used for defining the precision or spatial structure of the three-dimensional geological model; the modeling parameters include at least three of: grid space parameters, tolerance of horizon data to faults and grid search radius;
and generating a three-dimensional geological model according to the modeling parameters, the stratum interpretation data and the fracture system model.
2. The method of claim 1, wherein determining structural relationships between fault layers from the fault interpretation data comprises:
determining the sequencing information of the fault according to the time information and the space information of the fault interpretation data;
and determining the structural relationship among the fault layers according to the sequencing information.
3. The method of claim 1, wherein generating a three-dimensional geological model from the modeling parameters, the stratigraphic interpretation data, and the fracture system model comprises:
determining a plurality of build layers from the plurality of slip layers;
determining contact relation data of the structural layer according to the modeling parameters, the stratum interpretation data and the fracture system model;
and generating a three-dimensional geological model according to the contact relation data and the fracture system model.
4. The method of claim 3, wherein generating a three-dimensional geological model from the contact relationship data and the fracture system model comprises:
acquiring a preset contact relation parameter; the contact relation parameter is used for defining the space position of a fault or a horizon;
if the contact relation data of the structural layer is not in the preset contact relation parameter range, adjusting the contact relation data of the structural layer so as to enable the adjusted contact relation data of the structural layer to be in the preset contact relation parameter range;
and generating a three-dimensional geological model according to the adjusted contact relation data of the structural layer and the fracture system model.
5. A multi-slip layer structure three-dimensional geological modeling apparatus, comprising:
the interpretation module is used for carrying out closed interpretation on the multi-slippage layer structure by utilizing three-dimensional seismic data to obtain fault interpretation data and stratum interpretation data;
the structural relationship module is used for determining the structural relationship among fault layers according to the fault interpretation data and generating a fracture system model according to the structural relationship;
the parameter acquisition module is used for acquiring modeling parameters; the modeling parameters are used for defining the precision or spatial structure of the three-dimensional geological model; the modeling parameters include at least three of: grid space parameters, tolerance of horizon data to faults and grid search radius;
and the model generation module is used for generating a three-dimensional geological model according to the modeling parameters, the stratum interpretation data and the fracture system model.
6. The device for three-dimensional geological modeling of multi-slip layer configurations according to claim 5, wherein said structural relationship module is specifically configured to:
determining the sequencing information of the fault according to the time information and the space information of the fault interpretation data;
and determining the structural relationship among the fault layers according to the sequencing information.
7. The device for three-dimensional geological modeling of multi-slip layer configurations according to claim 5, wherein said model generation module is specifically configured to:
determining a plurality of build layers from the plurality of slip layers;
determining contact relation data of the structural layer according to the modeling parameters, the stratum interpretation data and the fracture system model;
and generating a three-dimensional geological model according to the contact relation data and the fracture system model.
8. The device for three-dimensional geological modeling of multi-slip layer configurations according to claim 7, wherein said model generation module is specifically configured to:
acquiring a preset contact relation parameter; the contact relation parameter is used for defining the space position of a fault or a horizon;
if the contact relation data of the structural layer is not in the preset contact relation parameter range, adjusting the contact relation data of the structural layer so as to enable the adjusted contact relation data of the structural layer to be in the preset contact relation parameter range;
and generating a three-dimensional geological model according to the adjusted contact relation data of the structural layer and the fracture system model.
9. Computer device 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 of the claims 1 to 4 when executing the computer program.
10. A computer-readable medium having non-volatile program code executable by a processor, the program code causing the processor to perform the method of any of claims 1-4.
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