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Deep curve static correction method during near-surface stratification

A near-surface, static correction technology, applied in the field of oil and gas seismic exploration, to improve work efficiency and ensure the effect of static correction

Active Publication Date: 2019-06-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a static correction method for time-depth curves of near-surface layers that can efficiently solve the static correction problem of seismic exploration in complex surface areas

Method used

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  • Deep curve static correction method during near-surface stratification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1. It comes from a 3D seismic project in the piedmont zone of the Junggar Basin in the west of Sinopec Shengli Oilfield. The work area is located in the Xinjiang Uygur Autonomous Region. The specific implementation methods are as follows:

[0053] (1) Reasonable layout of micro-logging wells on the surface of the work area for near-surface investigation;

[0054] (2) Establish a single well core profile and pick up the first arrival time of each micro-logging well according to micro-logging drilling and coring, figure 2 ;

[0055] (3) According to the first arrival of the micro-log, the near-surface velocity of a single well is inverted, image 3 ;

[0056] (4) The near-surface lithology is interpreted according to the core profile of a single well, and the near-surface of the work area is divided into loess layer and gravel layer from top to bottom;

[0057] (5) Establish the relationship between near-surface lithology and velocity, the velocity correspond...

Embodiment 2

[0064] Example 2. Originated from a seismic exploration project on the edge of a desert in the Junggar Basin in the west of Sinopec Shengli Oilfield, the work area is located in the Xinjiang Uygur Autonomous Region. The specific implementation methods are as follows:

[0065] (1) Reasonable layout of micro-logging wells on the surface of the work area for near-surface investigation;

[0066] (2) Establish a single well core profile and pick up the first arrival time of each micro-logging well according to micro-logging drilling and coring;

[0067] (3) Retrieve the near-surface velocity of a single well based on the first arrival of the microlog;

[0068] (4) Perform near-surface lithology interpretation based on the core profile of a single well, and the near-surface of the work area is divided into sand layer and high-velocity layer from top to bottom;

[0069] (5) Establish the relationship between near-surface lithology and velocity, the velocity corresponding to the san...

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Abstract

The invention provides a deep curve static correction method during near-surface stratification. The method comprises the following steps: reasonably arranging micro logs on the surface of a work areato perform near-surface survey; establishing a single-well core profile according to micro-logging drilling and coring; picking up the initial arrival time of each micro log; performing first arrivalinversion on the single-well near-surface speed according to the micro log; performing near-surface lithologic interpretation based on the single-well core profile; establishing a relationship between the near-surface lithology and the speed; sorting out deep scatter data sets of different lithologic layers; fitting to obtain a time-depth curve of each lithologic layer; establishing a lithological interface of the whole work area; obtaining shot point and detection point information; and calculating the static correction amount of a shot point and a detection point. According to the deep curve static correction method during the near-surface stratification provided by the invention, a complex near-surface rapid static correction method is realized, a static correction effect is ensured, the working efficiency is improved, and the method can be applied to the industrial production of seismic exploration.

Description

technical field [0001] The invention relates to the technical field of oil and gas seismic exploration, in particular to a static correction method for time-depth curves of near-surface layers. Background technique [0002] Seismic exploration in western my country is designed to cover complex near-surface types such as deserts, farmlands, Gobi, gravel, and piedmont. It is the bottleneck that restricts seismic exploration in complex areas, and seriously affects the imaging effect of seismic data. Aiming at the problem of static correction in complex areas, various techniques such as refraction static correction, tomographic static correction, and wave equation static correction have been studied. Good results. Desert areas, gravel areas and other near-surfaces are approximated as continuous media. Some people have proposed a static correction method based on the first arrival of refracted wave velocity model inversion of the continuum, and some have proposed a static correc...

Claims

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Application Information

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IPC IPC(8): G01V1/36
Inventor 崔庆辉尚新民王延光王兴谋赵胜天赵翠霞滕厚华孙兴刚
Owner CHINA PETROLEUM & CHEM CORP