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Method for determining optimum velocity section for pre-stack time migration

A pre-stack time migration and optimal speed technology, applied in the field of petroleum geophysical exploration, can solve the problems of long cycle, many manual operations, and many processing steps, so as to improve the practicality and reduce the amount of calculation

Active Publication Date: 2010-09-22
BGP OF CHINA NAT GASOLINEEUM CORP
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Problems solved by technology

The advantage of this method is that the results are reliable, and the disadvantage is that there are many manual operations.
[0010] The common disadvantages of the above three methods in the prior art are: 1. The user needs special skills and experience; 2. There are many processing steps and a long cycle

Method used

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  • Method for determining optimum velocity section for pre-stack time migration
  • Method for determining optimum velocity section for pre-stack time migration
  • Method for determining optimum velocity section for pre-stack time migration

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Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] The specific implementation steps of the present invention are as follows:

[0032] 1) Artificially excite seismic waves near the surface, and arrange geophones on the surface to collect reflected seismic data, which carry information about underground geological conditions;

[0033] 2) According to the information obtained from the processing of seismic data, determine the velocity that changes with the seismic wave reflection time (such as 1000ms 3000m / s, 2000ms 3500m / s, 3000ms 4000m / s, 5000ms 4600m / s, etc.) as the center Then take the velocity interval that changes with the seismic wave reflection time (such as 1000ms 30m / s, 2000ms 35m / s, 3000ms 40m / s, 5000ms 50m / s, etc.) One, three equal intervals, plus one, two, three equal intervals, form a group of velocity functions that change with the seismic wave reflection time, and use these velocity functions to...

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Abstract

The invention discloses a method for determining an optimum velocity section for pre-stack time migration in the processing of petroleum earthquake data. The method comprises the following steps of: forming a group of functions of the velocity which varies along with the reflection time of the earthquake wave for the central velocity by taking the velocity which varies along with the reflection time of earthquake wave as the central velocity and the velocity interval which varies along with the reflection time of the earthquake wave as the varying step length; performing pre-stack migration on the acquired earthquake data, wherein the result varies along with the velocity and is listed in the form of velocity spectrum; and generating the determined pre-stack time migration on a common reflection point into the optimum velocity section for the pre-stack time migration according to the strength and distribution of an energy ball on the velocity spectrum, and the optimum velocity of the re-stack time migration on a gather. By calculating the information needing to be output on a velocity analysis point in a valid velocity range, the method obviously reduces the calculation amount and improves the practicability.

Description

technical field [0001] The invention relates to petroleum geophysical prospecting technology, belongs to the technical category of subterranean area imaging in the process of seismic data processing, and is a method for determining the best velocity profile of pre-stack time migration. Background technique [0002] In the exploration of oil and gas resources, reflection seismic is a common method. The process is to excite seismic waves near the surface, the seismic waves propagate underground, and return to the surface after being reflected by the interface between different underground layers. The reflected seismic waves received at the surface carry information about the structure and lithology of the subsurface. After processing the received reflected seismic wave data, the underground geological conditions can be obtained, which is helpful for judging the distribution of oil and gas. [0003] Although the original seismic data collected from the field contains rich sub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
Inventor 徐常练刘超颖
Owner BGP OF CHINA NAT GASOLINEEUM CORP
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