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Method and device for acquiring seismic velocity in thin reservoir layer through well control

A layer velocity and thin reservoir technology, applied in the field of well control to obtain high-precision prediction of seismic thin reservoir velocity, can solve the problems such as no clear solution, and achieve the effect of improving prediction accuracy

Active Publication Date: 2011-07-20
PETROCHINA CO LTD
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  • Application Information

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Problems solved by technology

[0006] Conventional seismic velocity analysis does not have a clear solution to the accuracy of seismic velocity, the error analysis of seismic velocity and logging velocity, and how to correct the errors between them.

Method used

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  • Method and device for acquiring seismic velocity in thin reservoir layer through well control
  • Method and device for acquiring seismic velocity in thin reservoir layer through well control
  • Method and device for acquiring seismic velocity in thin reservoir layer through well control

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Embodiment 1

[0045] 1. There are more than 100 wells in a certain area of ​​the work area, and there are 24 wells with relatively complete representative well sections in the preferred work area, which can better reflect the velocity changes in the whole area. As shown in Fig. 5(a), it shows the single well results of time-depth relationship calibration of 24 full well segments. The value on the left is the acoustic time difference value, and the columns are the individual well models. By displaying 24 wells in the same color range, it is better to check the correction of the logging environment, which can reflect the change law of the velocity from shallow to deep in the whole area, and convert the logging data in the depth domain to the single well standard time domain The model, the vertical and horizontal variation law is more reasonable, reflecting the reservoir variation law. Taking into account factors such as elevation and base level changes, and analyzing the calibration of each ...

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Abstract

The invention discloses a method for acquiring the seismic velocity in a thin reservoir layer through well control. The method comprises the following steps of: selecting a standard single well velocity model and acquiring a corresponding logging acoustic time difference; acquiring a stacking velocity spectrum for seismic data imaging treatment and generating a stacking velocity data volume; selecting a time step length of 15-20 ms and carrying out velocity conversion on the logging acoustic time difference to obtain the velocity of a logging layer; converting the stacking velocity data volume into a logging-seismic joint forecast interval-velocity data volume; carrying out hierarchic and segmental error correction calculation on the velocity of the logging layer and the logging-seismic joint forecast interval-velocity data volume by adopting a ratio method to generate planar correction coefficients corresponding to various layers in different depths; and hierarchically and segmentally applying the planar correction coefficients to the logging-seismic joint forecast interval-velocity data volume of each layer correspondingly from top to bottom so as to obtain a high-accuracy seismic interval velocity data volume. The embodiment of the invention verifies that the method and the device for acquiring the seismic velocity in the thin reservoir layer through well control are beneficial to improvement of the forecast accuracy of the seismic velocity in the thin reservoir layer and can be used for obtaining velocity data with higher reliability.

Description

technical field [0001] The invention relates to the technical field of oil and gas geophysical exploration, in particular to a method and device for well control to obtain high-precision prediction of seismic thin reservoir velocity. Background technique [0002] The velocity problem is a very complicated problem in seismic exploration, which involves various links such as seismic data processing, interpretation and inversion. At the same time, velocity is the link between seismic data and drilling data, and it is also a very important parameter throughout the whole process of seismic exploration, processing and interpretation. Whether the velocity selection is correct or not directly affects seismic data processing and imaging. Gas anomalies, fine reservoir inversion, and time-depth conversion all play an important role. It directly determines the accuracy of structural interpretation and mapping, and plays an important role in the interpretation of abnormal bodies, struct...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/36
Inventor 杜斌山雍学善曹正林张平赵伟
Owner PETROCHINA CO LTD
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