CN104459781A - Three-dimensional pre-stack seismic data random noise degeneration method - Google Patents
Three-dimensional pre-stack seismic data random noise degeneration method Download PDFInfo
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Abstract
The invention provides a three-dimensional pre-stack seismic data random noise degeneration method. The three-dimensional pre-stack seismic data random noise degeneration method includes the following steps: each node in multiple nodes receives a four-dimensional space small data block distributed to the node in parallel, and each four-dimensional space small data block is formed by dividing X, Y and Z three-dimensional pre-stack seismic data according to three directions including a line in the call line direction, a common middle point CMP in the main testing line direction and offset or track numbers in a CMP gather. Each node conducts pre-stack random noise degeneration RNA calculation, in-node stacking processing and outputting on the four-dimensional space small data blocks distributed to the node in parallel, and stacking processing and outputting between adjacent nodes are carried out in parallel through communication between the adjacent nodes. By means of the three-dimensional pre-stack seismic data random noise degeneration method, the three-dimensional pre-stack seismic data RNA processing efficiency is improved, and the time needed for three-dimensional pre-stack seismic data RNA processing is shortened.
Description
Technical field
The present invention relates to Seismic Exploration Data Processing technical field, especially relate to a kind of random noise attenuation method of three-dimensional earthquake data before superposition.
Background technology
In the gatherer process of geological data, due to the complicacy of work area surface conditions, and the impact of external environment condition residing for focus and geophone station, normal containing many random noises in seismic data, as microseism, background interference etc.It is very wide that these show as the distribution of rambling random noise on seismologic record, had a strong impact on the signal to noise ratio (S/N ratio) of data, brought great difficulty to the process interpretation work of seismic data.Therefore, people are seeking the effective ways removing random noise always.Based on random noise attenuation (the Random noise attenuation of prediction theory, RNA) be compare one of effective method, it proposed the filtering of F-X territory by canales in 1984 the earliest, and was used widely in seismic data processing so that the conspicuousness in its theoretic tightness and actual effect is very fast.Through long-term constantly development, develop into current four-dimensional F-XYZ territory prediction noise-removed technology from early stage two-dimentional F-X territory.
When the occurrence of underground medium is not level, the lineups of reflection seismic can offset, and can not reflect the true occurrence of this place's underground medium; At this moment require to carry out migration when seismic data process.Skew has two kinds of modes: offset after skew and superposition before superposition, the former is just prestack, and the latter is poststack.Equally, three-dimensional earthquake data before superposition also needs to carry out RNA.
In prior art, three-dimensional earthquake data before superposition carries out being all adopt single node serial processing in the process of RNA process.But, along with height cover, the applying of high-density acquisition technique, three-dimensional earthquake data before superposition needs logarithm to calculate with the mass data of TB level when carrying out RNA process usually, and this can spend longer operation time, thus has a strong impact on its application in production.
Summary of the invention
The object of the present invention is to provide a kind of random noise attenuation method of three-dimensional earthquake data before superposition, to improve the efficiency of earthquake data before superposition RNA process.
For achieving the above object, the invention provides a kind of random noise attenuation method of three-dimensional earthquake data before superposition, comprising the following steps:
In multiple node, each nodal parallel receives the four-dimentional space small data block being distributed to self, described four-dimentional space small data block is split into according to the geophone offset in the common midpoint (Common Middle Point, CMP) in the line in interconnection direction, main profile direction, CMP road collection or Taoist monastic name three directions by three-dimensional X, Y, Z earthquake data before superposition;
Described each node carries out overlap processing and output in random noise attenuation RNA calculating, node to the four-dimentional space small data block being distributed to self is parallel, and carries out overlap processing and output between adjacent node by communication between adjacent node is parallel.
The random noise attenuation method of three-dimensional earthquake data before superposition of the present invention, enables one and controls thread in described each node, for the I/O resources control of task computation, this node, overlap processing state controls and output processing state controls.
The random noise attenuation method of three-dimensional earthquake data before superposition of the present invention, the I/O resources control of described node specifically comprises:
To distribute to the four-dimentional space small data block of this node according to X, Y, Z tri-direction labels successively, at each intra-node, the calculating of described four-dimentional space small data block is carried out successively according to described label.
The random noise attenuation method of three-dimensional earthquake data before superposition of the present invention, described overlap processing status controlling packet is drawn together:
Described each node uses the overlap processing state of all four-dimentional space small data blocks in this node of table record; The overlap processing state of each four-dimentional space small data block has three kinds: 0 expression not do overlap processing, and overlap processing is done in 1 expression, and 2 expressions are waited until with aftertreatment; The overlap processing order of each four-dimentional space small data block is carried out according to described label order, and the overlap processing for state 0 is wait; For the overlap processing of state 1 for doing overlap processing, for the overlap processing of state 2 for skipping.
The random noise attenuation method of three-dimensional earthquake data before superposition of the present invention, described output processing status controlling packet is drawn together:
Described each node uses the output state of all four-dimentional space small data blocks in this node of table record, and the output state of each four-dimentional space small data block has two kinds: 0 to represent not exportable, and 1 represents output; The output order of each four-dimentional space small data block is carried out according to described label order, and the output processing state for state 0 controls as waiting for, the output processing state for state 1 controls as directly exporting.
The random noise attenuation method of three-dimensional earthquake data before superposition of the present invention, enables multiple computational threads in described each node, and each described computational threads calculates for the prestack RNA completing a four-dimentional space small data block.
The random noise attenuation method of three-dimensional earthquake data before superposition of the present invention, enables an overlapping thread in described each node, for the overlap processing of four-dimentional space small data interblock adjacent in this node.
The random noise attenuation method of three-dimensional earthquake data before superposition of the present invention, enables one and exports thread, export for data in this node in described each node.
The random noise attenuation method of three-dimensional earthquake data before superposition of the present invention, one is enabled for the communication of overlapped data between adjacent node and the overlapping process exported in described each node, this process comprises a communication thread for overlapped data between adjacent node, and an overlap for overlapped data output processing between adjacent node exports thread.
The random noise attenuation method of three-dimensional earthquake data before superposition of the present invention, described multiple node is Linux cluster.
Just three-dimensional X, Y, Z earthquake data before superposition of the embodiment of the present invention splits some four-dimentional space small data blocks according to the geophone offset in CMP, CMP road collection in the line in interconnection direction, main profile direction or Taoist monastic name three directions and is distributed on multiple node, then to utilize between node multi-core parallel concurrent in multi-CPU and node to calculate to realize accelerating RNA process, thus improve the efficiency of three-dimensional earthquake data before superposition RNA process, shorten the time needed for three-dimensional earthquake data before superposition RNA process.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, does not form limitation of the invention.In the accompanying drawings:
Fig. 1 is the random noise attenuation method flow diagram of the three-dimensional earthquake data before superposition of the embodiment of the present invention;
Fig. 2 is Data dissemination schematic diagram in the embodiment of the present invention;
Fig. 3 is the Parallel Design schematic diagram of individual node in the embodiment of the present invention;
Fig. 4 a is prior art serial computing result schematic diagram;
Fig. 4 b is embodiment of the present invention parallel computation result schematic diagram.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment and accompanying drawing, the present invention is described in further details.At this, schematic description and description of the present invention is for explaining the present invention, but not as a limitation of the invention.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Shown in figure 1, the random noise attenuation method of the three-dimensional earthquake data before superposition of the embodiment of the present invention comprises the following steps:
In step S101, multiple node, each nodal parallel receives the four-dimentional space small data block being distributed to self.Wherein, four-dimentional space small data block is split into according to the geophone offset in CMP, CMP road collection in the line in interconnection direction, main profile direction or Taoist monastic name three directions by three-dimensional X, Y, Z earthquake data before superposition; As shown in Figure 2, system first by data traversal once, in ergodic process, a task parallelism of each node reads four-dimentional space small data block, then according to the task division scheme of setting, several four-dimentional space small data blocks are distributed to each node, wherein, for the node that data-handling capacity is suitable, average as far as possible issues each node by four-dimentional space small data block average mark.Ratio is if any M Y-direction four-dimentional space small data block, and N number of node, then the number of tasks of each node is: M/N rounds and adds one.
Step S102, each node carry out overlap processing and output in random noise attenuation RNA calculating, node to the four-dimentional space small data block being distributed to self is parallel, and carry out overlap processing and output between adjacent node by communication between adjacent node is parallel.Below in conjunction with Fig. 3, the parallel processing mechanism of each node is described:
In the embodiment of the present invention, enable one and control thread in each node, for the I/O resources control of task computation, this node, overlap processing state controls and output processing state controls.
The I/O resources control of this node specifically comprises: will distribute to the four-dimentional space small data block of this node according to X, Y, Z tri-direction labels successively, at each intra-node, the calculating of described four-dimentional space small data block is carried out successively according to described label.
Overlap processing status controlling packet is drawn together: each node uses the overlap processing state of all four-dimentional space small data blocks in this node of table record; The overlap processing state of each four-dimentional space small data block has three kinds: 0 expression not do overlap processing, and overlap processing is done in 1 expression, and 2 expressions are waited until with aftertreatment; The overlap processing order of each four-dimentional space small data block is carried out according to described label order, and the overlap processing for state 0 is wait; For the overlap processing of state 1 for doing overlap processing, for the overlap processing of state 2 for skipping.
Output processing status controlling packet is drawn together: each node uses the output state of all four-dimentional space small data blocks in this node of table record, and the output state of each four-dimentional space small data block has two kinds: 0 to represent not exportable, and 1 represents output; The output order of each four-dimentional space small data block is carried out according to described label order, and the output processing state for state 0 controls as waiting for, the output processing state for state 1 controls as directly exporting.
In the embodiment of the present invention, enable multiple computational threads in each node, each described computational threads calculates for the prestack RNA completing a four-dimentional space small data block, concrete:
(a), use multiple thread to carry out FFT conversion to multiple four-dimentional space small data block is parallel, thus time domain four-dimentional space small data block is transformed into frequency domain four-dimentional space small data block, now, the seismic trace that each thread process is different;
(b), use multiple thread parallel to ask for predictive filtering operator, now, the frequency that each thread process is different, asks for its predictive filtering operator for each frequency by the system of equations of a solution complex coefficient matrix;
(c), use multiple thread parallel to carry out convolution calculating to multiple predictive filtering operator, with by frequency domain four-dimentional space small data block corresponding for each for application corresponding for multiple predictive operator frequency;
(d), with the FFT transformation classes of step (a) seemingly, carry out FFT inverse transformation by parallel for the Output rusults of step (c), thus filtered frequency domain four-dimentional space small data block converted back time domain.
In the embodiment of the present invention, in each node, enable an overlapping thread, for the overlap processing of four-dimentional space small data interblock adjacent in this node.The four-dimentional space small data block overlap processing of such as Z-direction can all be carried out in this node; In Y-direction the four-dimentional space small data block at two ends overlap we wait until last process, all the other directly carry out in this node; In X-direction, a part of four-dimentional space small data block needs other node data adjacent, and leave overlap and output process between adjacent node for this part four-dimentional space small data block and process, all the other four-dimentional space small data blocks carry out at this intra-node.
In the embodiment of the present invention, enable one in each node and export thread, export for data in this node.
In the embodiment of the present invention, one is enabled for the communication of overlapped data between adjacent node and the overlapping process exported in each node, this process comprises a communication thread for overlapped data between adjacent node, and an overlap for overlapped data output processing between adjacent node exports thread.
Below, the Linux cluster formed for 6 nodes is to illustrate the effect of the embodiment of the present invention, concrete:
(a) test environment and test data
Test cluster environment comprises hardware environment, software environment, operating software, and wherein hardware environment is the Linux cluster of 6 nodes, and each node comprises 24 core CPU, is connected (two netting twine bindings) between node by gigabit networking; Operating software comprises serial RNA program and parallel RNA program; Test data adopts certain three-dimensional work area earthquake data before superposition, shown in concrete parameters table 1.
Table 1 test environment
| Node hardware environment | CPU：8X Intel(R)Xeon(R)CPU [email protected] |
| Internal memory: 6 × 4GB DDR3ECC REG 1333 internal memory | |
| Network: each node 2 gigabit Ethernets | |
| Software environment | OS:Red Hat Enterprise Linux server release 5.5 |
| Compiler: Intel compiler V11.0 | |
| Operating software | Serial RNA module |
| Parallel RNA module |
(b) the performance test results
In order to ensure stability and the confidence level of test performance result, we adopt different work parameter, different pieces of information scale, different nodes to test, and concrete outcome is as shown in table 2:
Table 2 test result
(c) the performance test results
Known with reference to figure 4a and Fig. 4 b, result and the serial RNA of parallel RNA are completely the same, but the efficiency of the parallel RNA of the embodiment of the present invention is then much higher.
Three-dimensional X, Y, Z earthquake data before superposition is split into some four-dimentional space small data blocks according to the geophone offset in common midpoint CMP, CMP road collection in the line in interconnection direction, main profile direction or Taoist monastic name three directions and is distributed on multiple node by the embodiment of the present invention, then to utilize between node multi-core parallel concurrent in multi-CPU and node to calculate to realize accelerating RNA process, thus improve the efficiency of three-dimensional earthquake data before superposition RNA process, shorten the time needed for three-dimensional earthquake data before superposition RNA process.
Those skilled in the art can also recognize that various illustrative components, blocks, unit and step that the embodiment of the present invention is listed can be realized by hardware, software or both combinations.So to being realized the designing requirement depending on specific application and whole system by hardware or software.Those skilled in the art for often kind of specifically application, can use the function described in the realization of various method, but this realization can should not be understood to the scope exceeding embodiment of the present invention protection.
Various illustrative logical block described in the embodiment of the present invention, or unit can pass through general processor, digital signal processor, special IC (ASIC), field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the design of above-mentioned any combination realizes or operates described function.General processor can be microprocessor, and alternatively, this general processor also can be any traditional processor, controller, microcontroller or state machine.Processor also can be realized by the combination of calculation element, such as digital signal processor and microprocessor, multi-microprocessor, and a Digital Signal Processor Core combined by one or more microprocessor, or other similar configuration any realizes.
The software module that method described in the embodiment of the present invention or the step of algorithm directly can embed hardware, processor performs or the combination of both.Software module can be stored in the storage medium of other arbitrary form in RAM storer, flash memory, ROM storer, eprom memory, eeprom memory, register, hard disk, moveable magnetic disc, CD-ROM or this area.Exemplarily, storage medium can be connected with processor, with make processor can from storage medium reading information, and write information can be deposited to storage medium.Alternatively, storage medium can also be integrated in processor.Processor and storage medium can be arranged in ASIC, and ASIC can be arranged in user terminal.Alternatively, processor and storage medium also can be arranged in the different parts in user terminal.
In one or more exemplary design, the above-mentioned functions described by the embodiment of the present invention can realize in the combination in any of hardware, software, firmware or this three.If realized in software, these functions can store on the medium with computer-readable, or are transmitted on the medium of computer-readable with one or more instruction or code form.Computer readable medium comprises computer storage medium and is convenient to make to allow computer program transfer to the telecommunication media in other place from a place.Storage medium can be that any general or special computer can the useable medium of access.Such as, such computer readable media can include but not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device, or other anyly may be used for carrying or store the medium that can be read the program code of form with instruction or data structure and other by general or special computer or general or special processor.In addition, any connection can be properly termed computer readable medium, such as, if software is by a concentric cable, fiber optic cables, twisted-pair feeder, Digital Subscriber Line (DSL) or being also comprised in defined computer readable medium with wireless way for transmittings such as such as infrared, wireless and microwaves from a web-site, server or other remote resource.Described video disc (disk) and disk (disc) comprise Zip disk, radium-shine dish, CD, DVD, floppy disk and Blu-ray Disc, and disk is usually with magnetic duplication data, and video disc carries out optical reproduction data with laser usually.Above-mentioned combination also can be included in computer readable medium.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a random noise attenuation method for three-dimensional earthquake data before superposition, is characterized in that, comprise the following steps:
In multiple node, each nodal parallel receives the four-dimentional space small data block being distributed to self, and described four-dimentional space small data block is split into according to the geophone offset in common midpoint CMP, CMP road collection in the line in interconnection direction, main profile direction or Taoist monastic name three directions by three-dimensional X, Y, Z earthquake data before superposition;
Described each node carries out overlap processing and output in random noise attenuation RNA calculating, node to the four-dimentional space small data block being distributed to self is parallel, and carries out overlap processing and output between adjacent node by communication between adjacent node is parallel.
2. the random noise attenuation method of three-dimensional earthquake data before superposition according to claim 1, it is characterized in that, enable one in described each node and control thread, for the I/O resources control of task computation, this node, overlap processing state controls and output processing state controls.
3. the random noise attenuation method of three-dimensional earthquake data before superposition according to claim 2, is characterized in that, the I/O resources control of described node specifically comprises:
To distribute to the four-dimentional space small data block of this node according to X, Y, Z tri-direction labels successively, at each intra-node, the calculating of described four-dimentional space small data block is carried out successively according to described label.
4. the random noise attenuation method of three-dimensional earthquake data before superposition according to claim 3, is characterized in that, described overlap processing status controlling packet is drawn together:
Described each node uses the overlap processing state of all four-dimentional space small data blocks in this node of table record; The overlap processing state of each four-dimentional space small data block has three kinds: 0 expression not do overlap processing, and overlap processing is done in 1 expression, and 2 expressions are waited until with aftertreatment; The overlap processing order of each four-dimentional space small data block is carried out according to described label order, and the overlap processing for state 0 is wait; For the overlap processing of state 1 for doing overlap processing, for the overlap processing of state 2 for skipping.
5. the random noise attenuation method of three-dimensional earthquake data before superposition according to claim 3, is characterized in that, described output processing status controlling packet is drawn together:
Described each node uses the output state of all four-dimentional space small data blocks in this node of table record, and the output state of each four-dimentional space small data block has two kinds: 0 to represent not exportable, and 1 represents output; The output order of each four-dimentional space small data block is carried out according to described label order, and the output processing state for state 0 controls as waiting for, the output processing state for state 1 controls as directly exporting.
6. the random noise attenuation method of three-dimensional earthquake data before superposition according to claim 1, is characterized in that, enables multiple computational threads in described each node, and each described computational threads calculates for the prestack RNA completing a four-dimentional space small data block.
7. the random noise attenuation method of three-dimensional earthquake data before superposition according to claim 1, is characterized in that, enables an overlapping thread in described each node, for the overlap processing of four-dimentional space small data interblock adjacent in this node.
8. the random noise attenuation method of three-dimensional earthquake data before superposition according to claim 1, is characterized in that, enables one and exports thread, export for data in this node in described each node.
9. the random noise attenuation method of three-dimensional earthquake data before superposition according to claim 1, it is characterized in that, one is enabled for the communication of overlapped data between adjacent node and the overlapping process exported in described each node, this process comprises a communication thread for overlapped data between adjacent node, and an overlap for overlapped data output processing between adjacent node exports thread.
10. the random noise attenuation method of three-dimensional earthquake data before superposition according to claim 1, is characterized in that, described multiple node is Linux cluster.
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