Seismic data processing shot gather wave equation prestack depth deviation parallel calculating method

A pre-stack depth migration and parallel computing technology, which is applied in seismic signal processing, multi-channel program devices, etc., can solve the problems of long computing cycle and large amount of computing, and achieve good scalability, high parallel efficiency, and shorten processing time. cycle effect

Inactive Publication Date: 2007-08-22
徐兆涛
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Problems solved by technology

However, the amount of calculation is relatively large and the calculation cycle is long

Method used

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  • Seismic data processing shot gather wave equation prestack depth deviation parallel calculating method
  • Seismic data processing shot gather wave equation prestack depth deviation parallel calculating method
  • Seismic data processing shot gather wave equation prestack depth deviation parallel calculating method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Based on the typical structural characteristics of the Jiyang Depression, the Shengli typical model and depth-velocity model were established. Figure 3 is the established depth-velocity model. It is an effective tool to test the imaging ability of the imaging algorithm suitable for complex continental structures.

[0026] The basic process of implementation is as follows:

[0027] (1) Start the operation;

[0028] (2) The main node uses the shot record as the task unit to allocate parallel tasks;

[0029] (3) Accept the task from the node, judge the task status, and determine whether to perform breakpoint recovery;

[0030] (4) Read the shot trace record, source record and depth velocity field from the node;

[0031] (5) Shot trace collection is recorded according to the depth step, and the source record wave field is extrapolated;

[0032] (6) In the time-space domain, time-shift correction is performed;

[0033] (7) Perform fast Fourier forward transform on the ...

example 2

[0043] Salt Dome Model Data

[0044] The wave equation 3D prestack depth migration program was tested on the SEG / EAGE salt dome model. This model is another internationally accepted theoretical geological model for testing complex structure imaging and velocity model building methods. The realization process is the same as example 1.

[0045] Figures 5 and 6 show the comparison of the horizontal slice of the velocity field of the salt dome model and the migration results at the corresponding depths. It can be seen that both the fault and the boundary of the salt body are quite clear.

[0046] Fig. 7 shows the pre-stack depth imaging results of the SEG / EAGE salt dome model data for a 3D single shot set. It can be seen from the figure that the outline of the salt dome and the structure of the salt dome are quite clear, and the subsalt faults and small flats are not clear.

example 3

[0048] The actual data of the Shengli Exploration Area

[0049] Using the self-developed processing system and the method module software of this paper, the actual data of 140 square kilometers in the Shengli exploration area were processed productively (as shown in Figure 8). The realization process is the same as example 1.

[0050] Geological interpreters believe that:

[0051] Chengnan fault, Guxi fault, Gubei fault and other fault points are crisp, and the cross-section and fault system are clear;

[0052] The resolution and signal-to-noise ratio of the Mesozoic and Upper Paleozoic are relatively high, and the shape and internal structure of the Mesozoic buried hill are clearly imaged, and the geological meaning of the horizon is clear. The reflection of non-standard layers in the Mesozoic is clear and can meet the needs of fine interpretation of unconformity reservoirs and description of sand bodies;

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Abstract

The invention relates to the key technology in the data processing of the oil and earthquake exploration which provides the earthquake data of the subtly geological structure description. The technology includes: (1) the cannon path collecting wave field extrapolated figure in the mix field; (2) the master-slave dynamic load balance parallel algorithm of the cannon path collecting wave field extrapolation; (3) the breakpoint recovery method of the parallel algorithm. The invention has improved the figure precision of the wave equation pre-fold depth excursion to proper for the land data processing; the parallel algorithm can use the free source and increase the work computing efficient. The breakpoint recovery method can not waste the pre-processing work, so it can shorten the processing period.

Description

Technical field: [0001] Wave equation prestack depth migration is a key technology in the process of petroleum seismic exploration data processing, which can realize accurate imaging of complex geological structures and provide seismic data with fine geological structure description for oil and gas geophysical exploration. Background technique: [0002] Most of the current oil and gas geophysical exploration targets have very complex geological structures. Conventional seismic data imaging methods cannot complete geological tasks well. Wave equation pre-stack depth migration has become an effective means for imaging complex geological structures. In the industrial seismic data processing software, most of them use the integration method with high calculation efficiency and good observation adaptability for pre-stack depth migration, but its imaging accuracy is low. The wave field extrapolation imaging of the shot gather wave equation developed in recent years, the wave field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/36G06F9/46
Inventor 徐兆涛
Owner 徐兆涛
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