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Accurate seismic structure imaging method

An imaging method and structural technology, applied in seismic signal processing and other directions, can solve problems such as low precision, insufficient calculation and imaging precision, and low calculation efficiency

Active Publication Date: 2010-03-03
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

Al-Yahya's formula uses these three conditions, Deregowski's formula uses the first two conditions, the formula derived by Lee and Zhang replaces the above third condition with the assumption of a small dip angle, and the DFA method of Mackay and Abma are also both These three conditions are used, but the accuracy of these methods of modifying the velocity is low, especially when the velocity lateral changes are severe and the calculation efficiency is also low
The residual velocity analysis method proposed by Xu Jixiang (2004) is based on the root mean square velocity assumption, which greatly improves the calculation efficiency of residual velocity analysis, but the calculation and imaging accuracy is still not high enough

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] The accurate seismic structure imaging method that the present invention provides, its specific embodiment is:

[0026] 1) Field seismic acquisition data, after conventional data preprocessing, pre-stack time migration processing is performed on the data to obtain the common reflection point gather data, as shown in Figure 1(a), which is the common reflection point of a certain common reflection point gather data;

[0027] 2) The common reflection point (CRP) gather data is sequentially processed by cutting, energy equalization, trace interpolation and bandpass filtering, as shown in Figure 1(b), which is the processed common reflection point gather;

[0028] The excision in step 2) refers to the excision of the gathers with severe shallow stretching and energy abnormal traces, and the energy balance refers to the collection data of shallow and deep layers, n...

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Abstract

The invention relates to an accurate seismic structure imaging method for reflected wave seismic data processing. The method comprises: migrating data to acquire common reflection point gather data; subjecting the common reflection point gather data to cutting, energy balance, trace interpolation and bandpass filtering processing sequentially; calculating a migration residual velocity spectrum byusing the velocity value of each common depth point in prestack time migration velocity field at a fixed time interval; the performing energy balancing processing; determining a residual velocity value of the largest energy at each time by using the calculated migration residual velocity spectrum; and updating the migration velocity field of a corresponding position to obtain an accurate prestacktime migration velocity field and an accurate seismic structure image. The accurate seismic structure imaging method can obtain a high resolution residual velocity spectrum, provides a reliable basisfor more accurate prestack time migration structure imaging and is suitable for imaging continental sedimentary basin late violent tectonic movement and layered transverse medium uneven structures.

Description

technical field [0001] The invention relates to reflection wave seismic data processing technology, in particular to an accurate seismic structure imaging method. Background technique [0002] Prestack time migration technology is one of the seismic data processing technologies that are highly valued at this stage. It can provide the most accurate seismic structural imaging data that we can see in the time domain, and it plays a pivotal role in the discovery of large-scale oil fields. The prerequisite for the large-scale popularization and application of this technology is the need to establish a reliable velocity field (data volume describing the velocity of the subsurface medium), and the establishment of the prestack time migration velocity field needs Therefore, the accuracy and effectiveness of the migration velocity analysis method has also become an important factor affecting the migration results. The high-precision migration velocity comes from the residual velocit...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 张建磊
Owner BC P INC CHINA NAT PETROLEUM CORP
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