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A Method for Determining the Optimal Velocity Profile for Prestack Time Migration

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

Active Publication Date: 2011-12-07
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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  • A Method for Determining the Optimal Velocity Profile for Prestack Time Migration
  • A Method for Determining the Optimal Velocity Profile for Prestack Time Migration
  • A Method for Determining the Optimal Velocity Profile for Prestack 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 is a method for determining the optimal velocity profile of pre-stack time migration for petroleum seismic data processing. The procedure is to take the velocity that changes with the seismic wave reflection time as the central velocity, and the velocity interval that varies with the seismic wave reflection time as the change step, form a set of velocity functions with the seismic wave reflection time for the central velocity, and then pre-stack the collected seismic data. Migration, the results are listed in the form of velocity spectrum as the velocity changes, according to the energy mass intensity and distribution position on the velocity spectrum, and the optimal velocity used for prestack time migration on the gather, the prestack time determined on the common reflection point Migrating Optimal Velocity Generates a prestack time-migrated optimal velocity profile. The invention calculates the information that needs to be output at the speed analysis point within the effective speed range, which significantly reduces the calculation amount and improves the practicality.

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 Patents(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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