Method of attenuating sea ice flexure noise during seismic surveys of permafrost regions involving a precursor aerial and/or satellite mapping step

Patent · Tue Nov 04 04:00:00 EST 1986

OSTI ID:7005431

Ostrander, W J

This patent describes a method of improving resolution of seismic data collected in a transition zone of a permafrost region between a frozen land mass and an adjacent sea-ice region. The data is collected by common midpoint (CMP) collection methods including sequentially activating at least one conventional vibratory source at a series of sourcepoint locations across the surface of the permafrost region. In this region the amplitude and phase spectra of the generated energy are controlled so that the generated energy changes smoothly as a function of time, and redundantly collection reflections thereof via a series of receivers at receiver stations provide 2-dimensional multifold coverage of the subsurface along a survey line. The method comprises: (a) adopting a survey strategy wherein the sourcepoint locations established for the at least one vibratory source, are always separated from the receiver stations by one or more ice fracture areas formed on or about the surface of the along the survey line; and (b) generating seismic field records by positioning and employing the at least one vibratory source and the series of receivers in accordance with the collection strategy of step (a) such that individual sourcepoint-receiver station locations can be redundantly associated with a selected number of traces to form a series of CMP gathers.

• Assignee: Chevron Research Co., San Francisco, CA
• Patent Number(s): US 4621347
• OSTI ID: 7005431
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
58 GEOSCIENCES
580203 -- Geophysics-- Geophysical Survey Methods-- (1980-1989)
AERIAL SURVEYING
AMPLITUDES
ATTENUATION
DATA ACQUISITION
DATA PROCESSING
FAILURES
FRACTURES
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
ICE
MAPPING
MEASURING INSTRUMENTS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NOISE
PERMAFROST
PETROLEUM DEPOSITS
POSITIONING
PROCESSING
REFLECTION
RESOLUTION
RESOURCES
SATELLITES
SEAS
SEISMIC ARRAYS
SEISMIC DETECTORS
SEISMIC SOURCES
SEISMIC SURVEYS
SURFACE WATERS
SURVEYS
TIME DEPENDENCE