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Velocity field construction method and device

A construction method and velocity field technology, applied in the field of velocity field construction methods and devices, can solve the problems of low accuracy and immature construction technology, and achieve the effect of accurate depth and reasonable plane trend.

Active Publication Date: 2019-01-11
PETROCHINA CO LTD
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Problems solved by technology

[0004] The purpose of the embodiment of the present application is to provide a method for constructing a velocity field to solve the problem of immature construction technology and low accuracy for complex rift basin velocity modeling in the prior art

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  • Velocity field construction method and device
  • Velocity field construction method and device

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Embodiment Construction

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present specification in combination with the drawings in the embodiments of the present specification. Obviously, the described embodiments are only some of the embodiments of the present specification, not all of them. Based on the embodiments in this specification, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of this specification.

[0026] Velocity modeling is constrained by the structure and sequence model, using well acoustic wave, VSP and velocity spectrum data to establish a three-dimensional average velocity data volume, which can establish velocity models for complex faults and rock uplifts. The structural map in the depth domain is the most important basis for guiding the layout of exploration wells. When seismic data are used for structural interpretation in geological ex...

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Abstract

Embodiments of the invention provide a velocity field construction method and device. The method comprises the following steps of: calculating velocity values at junctions of multiple well points andmultiple geological interfaces; carrying out interpolation calculation on the velocity value at the junction of each geological interface so as to obtain a first velocity value of the geological interface; obtaining a second velocity value of each geological interface on the basis of a reference velocity field obtained via pre-stack depth migration; constructing an error velocity field on the basis of the first velocity values and the second velocity values; and correcting a reference velocity field by using the error velocity field so as to obtain a target velocity field for time-depth conversion. By utilizing the method, data related to depth domains with correct well points and reasonable geological laws can be obtained in complicated rift basins.

Description

technical field [0001] The present application relates to the technical field of petroleum geological exploration, in particular to a method and device for constructing a velocity field. Background technique [0002] Depth-domain structural map is the most important basis to guide the layout of exploration wells, but it is generally difficult to obtain directly through measurement. Seismic data is used for structural interpretation to obtain two-way travel time data in the time domain, which is more of a feedback to the measured velocity. In this way, velocity becomes the most direct bridge to convert time-domain data into depth-domain data. How to use effective logging data and time-domain seismic data to establish an accurate velocity model is particularly important. An accurate velocity model has a decisive influence on the later exploration efficiency. [0003] At present, there are six velocity modeling methods, namely Dix formula velocity modeling, offset homing velo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/303G01V2210/6222
Inventor 洪亮雷明刘雄志苏玉平代寒松
Owner PETROCHINA CO LTD
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