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Data Acquisition and Prestack Migration Based on Seismic Visibility Analysis

A seismic data and visibility technology, applied in seismic data acquisition, seismology, seismic signal processing, etc., can solve the problem of high cost in time and money

Inactive Publication Date: 2011-12-14
LANDMARK GRAPHICS
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  • Summary
  • Abstract
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Problems solved by technology

Each of these solutions is prohibitively expensive in time and money

Method used

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  • Data Acquisition and Prestack Migration Based on Seismic Visibility Analysis
  • Data Acquisition and Prestack Migration Based on Seismic Visibility Analysis
  • Data Acquisition and Prestack Migration Based on Seismic Visibility Analysis

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Embodiment Construction

[0020] Visibility analysis methods and systems are disclosed that determine seismic survey source and / or receiver locations that are optimal for measuring properties of one or more selected subsurface features. Analysts can then acquire and process these regions to improve the imaging detail of these selected features. The disclosed systems and methods are best understood from the description in the Example Usage section.

[0021] corresponding, figure 1 is an example seismic survey environment in which an array of seismic receivers 102 are spaced across the earth's surface 104 to detect seismic waves. The receiver 102 is connected wirelessly or by cable to a data acquisition unit 106 that receives, processes and stores the seismic signal data collected by the receiver. A seismic energy source 108 (eg, a vibrator truck) is triggered at multiple locations to generate a seismic energy wave that propagates through the earth 110 and reflects from the acoustic impedance discontin...

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Abstract

Seismic visibility analysis of selected subsurface structures is employed to determine surface locations offering high visibility of target events. These locations can then be used as a basis for acquiring additional seismic survey data and / or selecting existing traces for re-migration with more sophisticated migration methods. With either usage, the newly migrated data is expected to offer enhanced images of the target event. In some embodiments, the visibility determination includes using a wave equation based propagator to find, for each of multiple simulated shots, a reflection wavefield from the target event in a seismic model; and to calulate, for each of multiple receiver positions, a contribution signal from each reflection wavefield. The visibility determination further includes converting each contribution signal into a source-receiver visibility value. Because data acquisition and / or re-migration is limited to the selected region, the imaging effort for the target event is significantly reduced.

Description

technical field [0001] The present invention relates to seismic visibility analysis, and more particularly, to data acquisition and prestack migration based on seismic visibility analysis. Background technique [0002] Scientists and engineers commonly use seismic surveys for exploration, geophysical research, and engineering planning. Seismic surveys can provide information about subsurface structure, including stratigraphic boundaries, rock types, and the presence of fluid reservoirs. The above information is extremely helpful in searching for water, geothermal reservoirs, and mineral deposits such as oil and gas and ores. Oil companies in particular often invest in expensive seismic surveys to select sites for exploring oil wells. [0003] Traditional seismic surveys use artificial sources of seismic energy, such as shells, air guns, or vibrators that generate seismic waves. When these sources ignite, they create a seismic "event," a pulse of seismic energy that travel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/00
CPCG01V1/30G01V1/003G01V1/345G01V2210/67G01V2210/673G01V2210/675G01V2210/679G01V20/00
Inventor 金胜汶许世勇
Owner LANDMARK GRAPHICS
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