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Plotting of magnetotelluric impedance to determine structure and resistivity variation of anomalies

Patent ·
OSTI ID:6071191
In magnetotelluric exploration wherein orthogonal measurements E/sub x/ and E/sub y/ of the earth's telluric field and orthogonal measurements H/sub x/ and H/sub y/ of the earth's magnetic field are made along a line of exploration, the magnetotelluric measurements are related to the impedance of the earth by the determinant of the matrix of impedance tensor components: is the impedance tensor relating the earth's electric fields E/sub x/, E/sub y/ to the earth's magnetic fields H/sub x/, H/sub y/, a method of plotting the magnetotelluric measurements is described to distinguish the structure of resistivity anomalies and separate near surface and depth anomalies comprising: filtering magnetotelluric measurements of E/sub y/, E/sub y/ H/sub x/ and H/sub y/ taken at sites along lines of exploration x and y to produce measurements of E/sub x/, E/sub y/, H/sub x/ and H/sub y/ for a plurality of successively low frequencies, each successively lower frequency representing a successively lower depth; determining the phase (phi/sub DET/) of the determinant of the matrix of impedance tensor components for the filtered measurements; plotting contours of equal values of the phase of the determinant as a function of the points on the line of exploration at which the measurements were made, for each of the successively lower frequencies.
Assignee:
Mobil Oil Corp., New York, NY
Patent Number(s):
US 4686476
OSTI ID:
6071191
Country of Publication:
United States
Language:
English

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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)
DEPTH
DIGITAL FILTERS
DIMENSIONS
ELECTRIC CONDUCTIVITY
ELECTRIC FIELDS
ELECTRIC IMPEDANCE
ELECTRICAL PROPERTIES
ELECTRICAL SURVEYS
ELECTROMAGNETIC SURVEYS
EXPLORATION
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
GRAPHS
IMPEDANCE
MAGNETIC FIELDS
MAGNETOTELLURIC SURVEYS
MATRICES
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
PHYSICAL PROPERTIES
RESOURCES
SURVEYS
TENSORS