Pre-stack time migration method and device
A pre-stack time migration and parallel algorithm technology, applied in the field of geological exploration, can solve the problems of large traffic of seismic data network, no solution proposed, and long time migration processing period.
Active Publication Date: 2017-03-22
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
Due to the fatal flaw of huge seismic data network traffic in both, the parallel hardware scale is limited to around 100 nodes, which is the fundamental reason for the long processing period of prestack time migration
[0005]
For the above problems, no effective solutions have been proposed so far
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[0048] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0049] The inventor considers that the three parallel algorithms of pre-stack time offset, common offset, input channel and output channel can be combined together, and considering the architecture of PC_Cluster distributed memory, the three algorithms are respectively applied between node groups, In the node group and node, a highly scalable pre-stack time migration algorithm is invented. Through the pre-stack time migration algorithm, the parallel scale can be expanded from 100 nodes to 1000 nodes and above, so as to shorten the stack time. Purpose of pre-time offset calculation cycle.
[00...
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The present invention provides a pre-stack time migration method and device, wherein the method is characterized by distributing the calculation tasks according to three levels, wherein the first level adopts a mode that one calculation task is distributed to one calculation node set for one time, and the calculation tasks of which the number is equal to the offset number are distributed to a plurality of calculation node sets for the PSTM processing; the second level adopts an output duct parallel algorithm to distribute the tasks to the nodes, thereby giving play to the calculation capability of the nodes in the sets; a calculation unit of one node is composed of the multiple cores of a shared memory and the tasks are distributed between the multiple cores of the third level according to the output duct parallel algorithm. According to the present invention, a network jam problem caused by the large seismic data network flow in the pre-stack migration imaging is solved by a three-level parallel algorithm structure, and a technical effect of finishing the pre-stack time migration simply and efficiently is realized.
Description
technical field [0001] The invention relates to the technical field of geological exploration, in particular to a pre-stack time migration method and device. Background technique [0002] Prestack time migration technology is one of the seismic data processing technologies, it can provide the most accurate seismic structure imaging data visible in the time domain, and it plays a very important role in the discovery of large-scale oil fields. [0003] As seismic exploration is entering the era of PB-level data, the processing cycle of seismic data is getting longer and longer. Among them, pre-stack time migration is the most time-consuming link in seismic data processing, which generally takes about 40% of the entire processing cycle. time. [0004] However, due to the many-to-many dependency between the input and output data of prestack time migration, the industry has always believed that the parallel algorithm of prestack time migration is data-dependent, so two independe...
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Login to View More IPC IPC(8): G01V1/28
CPCG01V1/28G01V2210/512
Inventor 王狮虎赵长海薛贵仁
Owner BC P INC CHINA NAT PETROLEUM CORP