Methods for acquiring and processing seismic data from quasi-simultaneously activated translating energy sources

Inactive Publication Date: 2005-06-16
CHEVROU USA INC
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[0012] It is an object of the present invention to provide a method for acquisition of seismic signals generated “quasi-simultaneously” from several moving separated sources activated with a small time delay, and their

Problems solved by technology

This results in signals generated from that particular energy source being generally

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  • Methods for acquiring and processing seismic data from quasi-simultaneously activated translating energy sources
  • Methods for acquiring and processing seismic data from quasi-simultaneously activated translating energy sources
  • Methods for acquiring and processing seismic data from quasi-simultaneously activated translating energy sources

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Embodiment Construction

[0021] This invention teaches a method for the acquisition of seismic data using quasi-simultaneous sources, as well as the processing of the superposed signals in order to separate the energy due to each source from the energy due to every other source in the constellation. For the purposes of this invention, the term “constellation” shall mean the set of spaced apart seismic sources bearing any relative spatial relationship among themselves, and able to move as a whole from one location to another as part of a seismic survey.

[0022] Quasi-simultaneous acquisition and its associated processing as described herein enable high quality seismic data to be acquired at a much greater operational efficiency as compared to a conventional seismic survey. The term “quasi-simultaneous” shall mean that the activation-time differences among the several sources in a constellation are not zero (thus the prefix “quasi”), but yet small enough (typically less than several seconds) so as not to inter...

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Abstract

A method for obtaining seismic data is disclosed. A constellation of seismic energy sources is translated along a survey path. The seismic energy sources include a reference energy source and a satellite energy source. The reference energy source is activated and the satellite energy source is activated at a time delay relative to the activation of the reference energy source. This is repeated at each of the spaced apart activation locations along the survey path to generate a series of superposed wavefields. The time delay is varied between each of the spaced apart activation locations. Seismic data processing comprises sorting the traces into a common-geometry domain and replicating the traces into multiple datasets associated with each particular energy source. Each trace is time adjusted in each replicated dataset in the common-geometry domain using the time delays associated with each particular source. This result in signals generated from that particular energy source being generally coherent while rendering signals from the other energy source is generally incoherent. The coherent and incoherent signals are then filtered to attenuate incoherent signals.

Description

TECHNICAL FIELD [0001] The present invention relates generally to seismic exploration, and more particularly, to acquiring and processing seismic data generated from generally simultaneously activated seismic energy sources. BACKGROUND OF THE INVENTION [0002] In the hydrocarbon exploration industry, remote sensing of underground geological formations using seismic waves provides information on the location, shape, and rock and fluid properties of potential hydrocarbon reservoirs. The standard technique comprises the activation of a source of acoustic energy which radiates seismic waves into the earth. These seismic waves reflect from and refract through subsurface geologic layers (acoustic illumination or insonification). The recording of these seismic waves by many different receivers (pressure or motion sensors) are ideally situated so as to optimize the ratio of information obtained to cost. This basic sourcing / insonification / recording procedure is repeated many times at slightly...

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Application Information

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IPC IPC(8): G01V1/00G01V1/02G01V1/38
CPCG01V1/003G01V1/005G01V2210/32G01V1/3808G01V1/36
Inventor HERKENHOFF, E. FREDERICSTEFANI, JOSEPH P.
Owner CHEVROU USA INC
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