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This can be done in a Then straightforward manner by drawing a parallel between the EM and acoustic wave equations. With appropriate approximations and identification of specific terms that have equivalent functions in both forms and with transformation from an initial value problem At each z step, equations (3) and (5) are solved for Q and P, to a boundary value problem, EM data can be imaged using respectively. The final composite solution is obtained by superimposing any of the methods originally developed for migration of seismic the contributions of all frequencies for all plane waves. The method chosen is Claerbout's (1976) 45degree, oneway, In order to Q(x, 4 P(x, 4. (6) The general form for the 2-D plane wave in a locally homogeneous The boundary conditions for both Hand E-polarizations at medium is: AAQ;,? This represents a vertical slice through the Earth.
- Geology > Rock Type > Sedimentary Rock (1.00)
- Geology > Geological Subdiscipline (0.71)
- Geophysics > Electromagnetic Surveying (0.91)
- Geophysics > Seismic Surveying > Seismic Processing (0.47)
Station spacing averaged 1 mile (1.6 km) with 4 detailed lines with one-quarter of a mile (400 m) References Several additional detailed lines have or are Bain, G. L., and Brown, C. E., 198 1, Evaluation of the Durham Triassic being surveyed. The Bouguer gravity of the Richmond basin area basin of North Carolin and techniques used to characterize its wastestorage is dominated by a large regional intrabasement anomaly on its potential: U.S.G.S. Open File report. This regional gradient makes any interpretation of the Presented at the 52nd Annual Meeting, Dallas. Mann, V. I., and Zablocki, F. S., 1961, Gravity features of the Deep River Wadesboro Triassic basin of North Carolina: Southeastern Geol., Since the margin of the basin is known, residual values in the 2, 191-216. The gravity stations Kevin Mickus, Univ. of Texas, El Paso; Carlos L. V. Aiken, in the basin are removed and a commonly used minimum Univ. of Texas at Dallas; and Daniel Ziegler, Southeastern curvature technique for gridding is applied to the remaining station Exploration and Production Co. Outside the basin the contours match the Triassic graben in Virginia, as part of a hydrocarbon exploration program.
- North America > United States > Virginia (1.00)
- North America > United States > Texas > El Paso County > El Paso (0.24)
- Geology > Sedimentary Geology (0.69)
- Geology > Structural Geology > Tectonics > Extensional Tectonics (0.50)
- Geology > Structural Geology > Fault > Dip-Slip Fault > Normal Fault (0.36)
- Geophysics > Seismic Surveying (1.00)
- Geophysics > Magnetic Surveying (1.00)
- Geophysics > Gravity Surveying (1.00)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > North America Government > United States Government (0.49)
- North America > United States > Virginia > Richmond Basin (0.99)
- North America > United States > Utah > Kaiparowits Basin (0.99)
- North America > United States > New Mexico > Albuquerque Basin (0.99)
- (2 more...)
A Test of Gravity And Magnetic Anomaly Inversion In Defining the Structure of the Sanford Basin, North Carolina, As an Example of a Triassic Basin
Lai, S.F. (Hexxis Inc.) | Ferguson, John F. (Georgia Institute of Technology) | Aiken, Carlos L.V. (Univ. of Texas at Dallas) | Ziegler, Daniel (Southeastern Exploration and Production Co.)
These regions correspond to areas in which extreme mantle upwarping and magma intrusion into the lithosphere were suggested gions by other geophysical studies. The high temperatures in other re (750 800 C) also support the hypothesis that crustal and lithospheric thinning took place. The assumption of thermal equilibrium, required by the downward continuation techniques, is clearly not satisfied in the examples reported here. However, the method provided a good first estimate of temperature in the crust which correlates well with other geologic and geophysical information. Subsurface temperature map at 20 km superimposed Generalized linear inversions of 2.5dimensional gravity and on map of major tectonic features and geographic magnetic anomalies are applied to the Sanford Triassic basin in boundaries.
- Geophysics > Gravity Surveying (1.00)
- Geophysics > Magnetic Surveying > Magnetic Modeling (0.48)
- North America > United States > Virginia > Richmond Basin (0.99)
- North America > United States > North Carolina > Durham Basin (0.99)
- North America > Canada > Alberta > Colorado Field > Bonavista Colorado 6-32-90-4 Well (0.98)
- (3 more...)