Static Correction Method for Time-Depth Curve of Near-Surface Stratification
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A near-surface, static correction technology applied in the field of oil and gas seismic exploration
Active Publication Date: 2021-09-07
CHINA PETROLEUM & CHEM CORP +1
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[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
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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 static correction method for time-depth curves of near-surface stratification, which includes: reasonably arranging micro-logging wells on the surface of the work area to conduct near-surface investigation; drilling and coring according to micro-logging wells to establish a single well core profile; picking each micro-logging well Inversion of the near-surface velocity of a single well based on the first arrival of the micro-logging; Interpretation of near-surface lithology based on the core profile of a single well; Establishment of the relationship between near-surface lithology and velocity; Scattered data set; fitting the time-depth curve of each lithology layer; establishing the lithology interface of the entire work area; obtaining shot point and receiver point information; calculating shot point and receiver point static correction. The near-surface layered time-depth curve static correction method realizes a complex near-surface fast static correction method, ensures the static correction effect and improves work efficiency, and can be used in 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...
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