WO2016041185A1 - Procédé d'analyse de vitesse de migration dans le temps de pré-empilement de haute efficacité - Google Patents

Procédé d'analyse de vitesse de migration dans le temps de pré-empilement de haute efficacité Download PDF

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Publication number
WO2016041185A1
WO2016041185A1 PCT/CN2014/086902 CN2014086902W WO2016041185A1 WO 2016041185 A1 WO2016041185 A1 WO 2016041185A1 CN 2014086902 W CN2014086902 W CN 2014086902W WO 2016041185 A1 WO2016041185 A1 WO 2016041185A1
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offset
stack
sub
time migration
seismic data
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PCT/CN2014/086902
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English (en)
Chinese (zh)
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杨顺伟
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杨顺伟
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Priority to PCT/CN2014/086902 priority Critical patent/WO2016041185A1/fr
Priority to CN201480002784.XA priority patent/CN104769459A/zh
Publication of WO2016041185A1 publication Critical patent/WO2016041185A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
    • G01V1/30—Analysis
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16Z—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS, NOT OTHERWISE PROVIDED FOR
    • G16Z99/00—Subject matter not provided for in other main groups of this subclass

Definitions

  • the invention relates to the field of petroleum exploration technology, in particular to an efficient pre-stack time migration speed analysis method.
  • prestack time migration is a commonly used imaging method, which has become a routine processing method.
  • the offset velocity field is an essential parameter when prestack time migration is performed. Therefore, the pre-stack time migration velocity analysis and the construction tools are efficient, convenient and practical, which is the decisive factor for the pre-stack time migration can be popularized.
  • the existing prestack time migration velocity analysis methods mainly include three methods: constant speed scanning method, stepwise correction method and edge velocity analysis method.
  • these three methods have the disadvantages of large calculation amount, many processing steps and long consumption period.
  • other prestack time migration speed analysis methods have appeared in the prior art.
  • the Chinese patent No. 200910080622.9 proposes a method for determining the prestack time migration speed, which is only for The information that needs to be output at the speed analysis point is calculated, the implementation is simple and the calculation amount is significantly reduced, but since the memory occupancy and the calculation operation time are proportional to the number of speed analysis position points, for more speed analysis The application of large-area 3D seismic exploration sites will be limited.
  • the foregoing various methods are applied to the processing of a single computer device, and are limited by the processing capability of a single computer device. Therefore, the foregoing various methods are also different in degree. There is a defect in the calculation cycle that is long and it is a disadvantage to successfully complete the pre-stack time shift operation.
  • the main objective of the embodiments of the present invention is to provide an efficient pre-stack time migration speed analysis method to solve the problem of long calculation period existing in the existing pre-stack time migration speed analysis method.
  • an embodiment of the present invention provides an efficient prestack time migration speed analysis method, and an efficient prestack time migration speed analysis method, including:
  • the allocation information including a correspondence between each sub-process and a pre-stack time offset velocity analysis location to be assigned to the sub-process;
  • the main process allocates a pre-stack time migration speed analysis position and a pre-stack seismic data track for each sub-process according to the allocation information;
  • Each pre-process uses the pre-stack time migration velocity analysis location and the pre-stack seismic data track to perform a pre-stack time offset, generates a pre-stack time offset result, and sends the result to the main process;
  • the main process obtains a prestack time migration speed analysis result according to a prestack time offset result sent by all the subprocesses, and the prestack time migration speed analysis result includes all prestack time migration speed analysis positions and all prestacks.
  • the common reflection point CRP gather, the offset section and the offset velocity spectrum corresponding to the seismic data track.
  • the determining allocation information is specifically:
  • Allocating memory space for each child process is specifically as follows:
  • the memory space is calculated according to the pre-stack time migration speed corresponding to the pre-stack time, the number of samples of the pre-stack seismic data track, and the preset pre-stack time offset calculation parameter, and is allocated to the sub-process. process.
  • the main process allocates the pre-stack seismic data track for each sub-process, specifically:
  • the main process assigns all pre-stack seismic data tracks to the sub-process.
  • the main process assigns a portion of the pre-stack seismic data track to the sub-process.
  • the main process allocates a part of the pre-stack seismic data track to the sub-process, specifically:
  • the main process determines a first set number of consecutive prestack seismic data tracks as a set of prestack seismic data tracks
  • a subsequent set of pre-stack seismic data tracks is assigned to the sub-process every second set number of consecutive pre-stack seismic data sets.
  • Each of the sub-processes uses the pre-stack time migration velocity analysis location and the pre-stack seismic data track to perform a pre-stack time offset to generate a pre-stack time migration result, specifically:
  • Each of the sub-processes determines a pre-stack time offset speed sequence, the pre-stack time allocated to the main process as each pre-stack time offset speed in the pre-stack time offset speed sequence
  • the offset velocity analysis location and the pre-stack seismic data track perform prestack time migration, and generate CRP gathers, offset profile segments, and offset velocity spectrum data corresponding to the subprocess.
  • Each of the sub-processes generates CRP gathers, offset profile segments, and offset velocity spectrum data corresponding to the sub-process, specifically:
  • Each of the sub-processes generates a CRP gather corresponding to the sub-process, an offset profile segment lacking common information, and offset velocity spectrum data lacking common information, wherein the common information is a CRP gather and an offset profile segment Information that is common to the offset velocity spectrum data and that can be directly summed using the CRP gather;
  • the main process obtains a prestack time migration speed analysis result according to the prestack time offset result sent by all the subprocesses. Specifically, it is:
  • the main process directly calculates the common information by using the CRP gather corresponding to the sub-process, and utilizes the common information and the missing profile segment and the missing Offset velocity spectrum data of the common information, obtaining offset profile segments and offset velocity spectrum data corresponding to the subprocess;
  • the main process synthesizes the CRP gathers, offset profile segments and offset velocity spectrum data corresponding to all the sub-processes, and obtains all pre-stack time migration velocity analysis positions and CRP gathers and offsets corresponding to all pre-stack seismic data tracks. Section segment and offset velocity spectrum.
  • the invention distributes the pre-stack time migration speed analysis calculation to a plurality of sub-processes, fully utilizes the computer cluster technology, significantly improves the speed of the pre-stack time migration speed analysis and calculation, and greatly shortens the pre-stacking
  • the working time of the time offset velocity analysis is especially suitable for large-area 3D seismic exploration sites with more velocity analysis locations, which has good practicability.
  • FIG. 1 is a flow chart of an efficient pre-stack time migration speed analysis method provided by the present invention
  • FIG. 2 is a schematic diagram of a working cooperation relationship between a main process and a sub-process provided by the present invention
  • FIG. 3 is a partial view of an offset velocity spectrum on a time-speed plane according to Embodiment 1 of the present invention.
  • FIG. 4 is a partial view of a CRP gather set at different offsets of different speeds on the in-phase axis of the reflected wave according to the first embodiment of the present invention
  • FIG. 5 is a partial view of an offset offset segment of a different speed versus a reflected wave in phase axis according to Embodiment 1 of the present invention
  • FIG. 6 is a partial view of an offset velocity spectrum calculated by using partial data according to Embodiment 1 of the present invention.
  • FIG. 7 is a partial view of a CRP gather set calculated by using partial data according to Embodiment 1 of the present invention.
  • FIG. 9 is a flowchart of a pre-stack time migration speed analysis and a field establishment process according to Embodiment 1 of the present invention.
  • the invention utilizes the computer cluster technology to adopt a parallelized operation mode for the calculation process of the pre-stack time migration speed analysis, which improves the speed of the pre-stack time migration speed analysis and shortens the operation period.
  • the present invention provides an efficient pre-stack time migration speed analysis method, including:
  • Step S11 applying for multiple processes, determining one of the multiple processes as the primary process, and the rest as the child process.
  • the step applies for resources of multiple (at least three) processes in the computer cluster, one of which is the main process and the other is the child process; wherein the main process is responsible for distributing data to the child process, and calculating the process of recycling the child process.
  • the child process is used to perform prestack time offset calculation using the data sent by the main process.
  • Figure 2 shows the working relationship between the main process and the child process in the present invention.
  • This step can estimate the amount of job calculation in advance, and consider the process usage of the current computer cluster device, and then determine how many processes are applied in total.
  • step S12 the allocation information is determined, and the allocation information includes a correspondence relationship between each sub-process and a pre-stack time offset speed analysis position to be allocated to the sub-process.
  • each sub-process can be assigned a corresponding number of pre-stack time migration speed analysis positions. If the number of prestack time offset velocity analysis locations is an integer multiple of the number of subprocesses, this step determines that all prestack time offset velocity analysis locations are evenly distributed to each subprocess, and each subprocess is determined to be assigned to The pre-stack time migration speed of the sub-process analyzes the correspondence between the positions. If the number of prestack time offset velocity analysis locations is not an integer multiple of the number of subprocesses, then the number of velocity analysis locations on different subprocesses differs by no more than one.
  • step S13 a memory space is allocated for each child process.
  • the step is performed for each sub-process, and the memory space is calculated according to the pre-stack time migration speed corresponding to the sub-process, the number of positions, the number of samples of the pre-stack seismic data track, and the preset pre-stack time offset calculation parameter. And assigned to the child process.
  • the memory space required for the pre-stack time offset calculation on each sub-process is mainly the number of samples of the pre-stack seismic data track.
  • the preset prestack time offset calculation parameter is related.
  • Step S14 The main process allocates a pre-stack time migration speed analysis position and a pre-stack seismic data track for each sub-process according to the allocation information.
  • the main process allocates pre-stack seismic data for each sub-process, which can be divided into continuous and interval forms, wherein
  • the continuous form means that the main process assigns all pre-stack seismic data tracks to the sub-process, and the interval form means that the main process allocates a partial pre-stack seismic data track to the sub-process.
  • the data input from the main process to each sub-process is larger and takes longer, but the pre-stack time migration speed analysis result obtained by the sub-process is more realistic; when the interval form is used, the main process sends The data input to each sub-process is small and takes a short time, but the signal-to-noise ratio of the pre-stack time migration speed analysis result obtained by the sub-process will decrease.
  • the operator can weigh the requirements of the actual operation on the amount of calculation, the length of calculation time, the high signal-to-noise ratio, etc., and determine whether to select the continuous form or the interval form.
  • the main process when the interval form is selected, in order to ensure that the seismic data track allocated to the sub-process reflects the geological condition as accurately as possible, the main process will set the first number (such as the line and the common center).
  • the continuous prestack seismic data track is determined as a set of prestack seismic data tracks; in the entire prestack seismic data track, every second set number of consecutive stacks
  • the pre-seismic data channel group assigns a subsequent set of pre-stack seismic data tracks to the sub-process, for example, the main process is in all pre-stack seismic data tracks, each skips a plurality of pre-stack seismic data track groups, and the subsequent one stack
  • the pre-seismic data track group is assigned to the sub-process.
  • each of the sub-processes uses the pre-stack time migration speed analysis position and the pre-stack seismic data track to perform a pre-stack time offset, and generates a pre-stack time offset result and sends the result to the main process.
  • Step S16 the main process obtains a prestack time migration speed analysis result according to the prestack time offset result sent by all the subprocesses, and the prestack time migration speed analysis result includes all prestack time migration speed analysis positions and all stacks.
  • the common seismic data corresponding to the common reflection point CRP gather, the offset profile and the offset velocity spectrum.
  • each sub-process performs calculation in parallel, and each sub-process performs a pre-stack time migration position on the pre-stack time migration velocity analysis position and the pre-stack seismic data track assigned to the main process by the main process, and passes all the sub-processes.
  • an optimal prestack time migration velocity can be determined, and the present invention can significantly improve the calculation speed of the prestack time migration velocity analysis.
  • the short operating period and the risk of failure in the middle of the calculation process are reduced, which provides favorable conditions for the prestack time migration during the seismic exploration data processing of oil and gas resources.
  • step S15 is specifically as follows: each sub-process determines a pre-stack time offset speed sequence, and uses each speed function in the pre-stack time offset speed sequence as the pre-stack time offset speed , the pre-stack time migration velocity analysis position assigned to the main process and the pre-stack seismic data track are pre-stack time offset, and the CRP channel corresponding to the sub-process is generated. Set, offset profile segments, and offset velocity spectrum data.
  • the calculation process performed by each sub-process is as follows: scanning each speed function in the pre-stack time migration speed sequence, using the scanned velocity function as the pre-stack time migration speed, based on the pre-stack time
  • the offset velocity is calculated by prestack time migration velocity analysis position and prestack seismic data track assigned to itself, and all speeds in the prestack time migration velocity sequence to be scanned are obtained.
  • Pre-stack time migration velocity sequence and pre-stack time migration velocity analysis location and pre-stack seismic data channel CRP gathers, offset profile segments, and offset velocity spectrum data, wherein the offset velocity spectrum data Is the basic data information required for the main process to generate the offset velocity spectrum in subsequent steps.
  • the tasks of the main process in this embodiment are as follows: comprehensively summarize the CRP gathers and offset profile segments calculated by all the sub-processes, and obtain all the pre-stack time migration velocity analysis locations and the CRP lanes corresponding to all pre-stack seismic data lanes.
  • the set, offset section segments, and the offset velocity spectrum data calculated by all the sub-processes are used to generate the full pre-stack time migration velocity analysis position and the offset velocity spectrum corresponding to all pre-stack seismic data tracks.
  • the center track of the offset profile segment can be directly calculated according to the CRP gather, and several pieces of information of the offset velocity spectrum data can also be directly calculated according to the CRP gather, in order to avoid double calculation, improve the calculation efficiency.
  • the information shared by the CRP gathers and the offset profile segments and the offset velocity spectrum data that can be directly calculated from the CRP gathers can be marked as common information.
  • Each sub-process no longer calculates the complete offset profile segment and offset velocity spectrum data in the specific calculation process, but only calculates the CRP gathers and the offset profile segments and the offset velocity spectrum data except the missing common information.
  • each sub-process sends the corresponding CRP gathers, the offset profile segments lacking the common information, and the offset velocity spectrum data to the main process; and then the main process uses the CRP gathers to directly calculate and obtain the common information, and utilizes The total information and the offset profile segment lacking the common information are combined to obtain the complete offset profile segment corresponding to each sub-process, and the offset velocity spectrum using the common information and the lack of common information.
  • the main process also integrates the CRP gathers and the complete offset profile segments corresponding to all the sub-processes together to obtain the full pre-stack time migration velocity analysis position.
  • 61 pre-stack time offset speed sequences are formed using 61 scan speed functions, numbered -30, -29, ..., -1, 0, 1, ..., 29, 30, respectively.
  • Each offset section has 11 lanes, indicating the velocity analysis position and 5 lanes before and after.
  • the sub-process performs the pre-stack time offset calculation, the above scanning speed function is cyclically used from the serial number -30 to 30, for the serial numbers of -8, -6, -4, -2, 0, 2, 4, 6, and 8.
  • the scan speed function skips no calculation, skipping the center track (speed analysis position) in the calculation of the offset profile segment is not calculated.
  • the main process sums the CRP gathers, and the central track of the nine offset profile segments is formed, and further converted into the velocity spectrum vacancies, the serial numbers are -8, -6, -4,
  • the calculation result of the scanning speed function of -2, 0, 2, 4, 6, and 8. This measure can The calculation amount of the scan speed prestack time shift is reduced by about 15%.
  • the above figures are just examples, and the processor can specify other numbers according to the actual situation.
  • the present invention can be applied to a large-area three-dimensional seismic exploration work area having a plurality of speed analysis positions.
  • This embodiment illustrates the beneficial effects of the prestack time migration optimal velocity profile calculation method provided by the present invention in a specific embodiment.
  • the range of the input data is 871-900
  • the CMP range is 553-2130
  • the sampling interval is 4ms
  • 2000 samples per channel
  • the data size is 35115.23MB, which is the data in the 3D work area. portion.
  • the speed analysis position is 42.
  • the running time of the original mode is 151:16:11.
  • the running time of the parallel operation of 6 processes and 6 processes is 9:43:36, which is shortened to 6.43% of the original mode; and each The node only needs the memory size of 7 speed spectra.
  • Input 1 line for every 3 lines, and 1 CMP for every 3 CMPs.
  • the parallel operation mode of 6 processes with 6 nodes is 1:02:14, which is further shortened to 0.69% of the original mode.
  • . 3 is a velocity spectrum (partial) at the measurement line 890 and CMP 1500 calculated using all input data
  • FIG. 4 is a CRP gather (partial) corresponding to a plurality of scan speeds
  • FIG. 5 is an offset profile corresponding to a plurality of scan speeds.
  • (partial). 6 is a velocity spectrum (partial) at the measurement line 890 and CMP 1500 calculated using one-ninth of the input data
  • FIG. 7 is a CRP gather (partial) corresponding to a plurality of scan speeds
  • FIG. 8 is a partial offset corresponding to the scan speed. Move the section (partial). It can be seen from the comparison of the corresponding drawings that the results calculated using one-ninth of the input data are basically the same, with only minor differences, indicating that this method is feasible.
  • the pre-stack time migration velocity analysis and the construction process of the present invention are very similar to the overlay velocity analysis and the construction, as shown in FIG. Therefore, the processing personnel with conventional seismic data processing experience can also determine the pre-stack time migration speed parameters, making the pre-stack time migration more convenient for large-scale popularization.

Abstract

L'invention porte sur un procédé d'analyse de vitesse de migration dans le temps de pré-empilement de haute efficacité. Le procédé met en œuvre : la demande d'une pluralité de processus, la détermination de l'un des processus comme étant un processus principal, et la détermination du reste des processus comme étant des sous-processus ; la détermination d'une information d'attribution ; l'attribution d'un espace de mémoire à chaque sous-processus ; l'attribution, par le processus principal, d'une position d'analyse de vitesse de migration dans le temps de pré-empilement et d'un suivi de données de tremblement de terre de pré-empilement à chaque sous-processus en fonction de l'information d'attribution ; l'utilisation, par chaque sous-processus, de la position d'analyse de vitesse de migration dans le temps de pré-empilement et du suivi de données de tremblement de terre de pré-empilement pour effectuer une migration dans le temps de pré-empilement, la génération d'un résultat de migration dans le temps de pré-empilement et l'envoi du résultat de migration dans le temps de pré-empilement au processus principal ; et l'obtention, par le processus principal, d'un résultat d'analyse de vitesse de migration dans le temps de pré-empilement en fonction des résultats de migration dans le temps de pré-empilement envoyés par tous les sous-processus, de façon à améliorer ainsi de façon remarquable la vitesse de calcul et à raccourcir ainsi de façon remarquable le temps de fonctionnement.
PCT/CN2014/086902 2014-09-19 2014-09-19 Procédé d'analyse de vitesse de migration dans le temps de pré-empilement de haute efficacité WO2016041185A1 (fr)

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CN201480002784.XA CN104769459A (zh) 2014-09-19 2014-09-19 一种高效叠前时间偏移速度分析方法

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CN112731532A (zh) * 2019-10-14 2021-04-30 中国石油化工股份有限公司 建立叠前时间偏移速度场的方法和装置
CN113376691A (zh) * 2020-03-10 2021-09-10 中国石油天然气集团有限公司 利用偏移速度扫描确定背斜宽度的方法及装置
CN113917536A (zh) * 2020-07-10 2022-01-11 中国石油化工股份有限公司 积分法成像实现ovg道集直接输出的方法
CN116088054A (zh) * 2023-03-07 2023-05-09 中国海洋大学 一种基于成像道集的剖面同相轴判别方法

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CN112559816A (zh) * 2019-09-26 2021-03-26 中国石油天然气集团有限公司 节点地震数据切分的性能优化方法及装置
CN113219534B (zh) * 2021-05-18 2023-10-20 中海石油(中国)有限公司深圳分公司 一种叠前深度偏移速度质控方法、装置、介质及电子设备

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CN112731532A (zh) * 2019-10-14 2021-04-30 中国石油化工股份有限公司 建立叠前时间偏移速度场的方法和装置
CN113376691A (zh) * 2020-03-10 2021-09-10 中国石油天然气集团有限公司 利用偏移速度扫描确定背斜宽度的方法及装置
CN113917536A (zh) * 2020-07-10 2022-01-11 中国石油化工股份有限公司 积分法成像实现ovg道集直接输出的方法
CN116088054A (zh) * 2023-03-07 2023-05-09 中国海洋大学 一种基于成像道集的剖面同相轴判别方法
CN116088054B (zh) * 2023-03-07 2023-06-13 中国海洋大学 一种基于成像道集的剖面同相轴判别方法

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