Two-dimensional interpretation of gravity anomalies over sedimentary basins with an exponential decrease of density contrast with depth

The decrease of density contrast with depth in sedimentary basins is approximated by an exponential function. The anomaly equation, in frequency domain, of a prismatic model with an exponential density function is derived. The method has been extended to derive the Fourier transforms of the gravity...

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Bibliographic Details
Published inAcademy Proceedings in Earth and Planetary Sciences Vol. 108; no. 2; pp. 99 - 106
Main Authors BHASKARA RAO, D, MOHAN RAO, C. P. V. N. J
Format Journal Article
LanguageEnglish
Published Bangalore Indian Academy of Sciences 01.06.1999
Springer Nature B.V
Subjects
Basins
Density
Depth
Earth sciences
Earth, ocean, space
Exact sciences and technology
Exponential functions
Fourier transforms
Frequency
Frequency domain analysis
Gravity anomalies
Internal geophysics
Prisms
Sedimentary basins
Solid-earth geophysics, tectonophysics, gravimetry
India
Godavari Valley
sedimentary basins
boreholes
Fourier transformation
gravity anomalies
Asia
gravimetry
two-dimensional models
accuracy
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Summary:The decrease of density contrast with depth in sedimentary basins is approximated by an exponential function. The anomaly equation, in frequency domain, of a prismatic model with an exponential density function is derived. The method has been extended to derive the Fourier transforms of the gravity anomalies of the sedimentary basin, wherein the basin is viewed as vertical prisms placed in juxtaposition. The gravity anomalies of the sedimentary basin are obtained by taking the inverse Fourier transforms. Filon’s method has been extended for calculating accurate inverse Fourier transforms. The accuracy of the method has been tested using a synthetic example. A combination of space and frequency domain methods have been developed for inversion of gravity anomalies over the sedimentary basin. The method has been applied to interpret one synthetic profile and one field profile over the Godavari basin. The method developed in this paper to calculate the inverse Fourier transforms yields continuous spectrum with accurate values. The maximum depth deduced from the gravity anomalies is of the same order as the depth encountered to the basement at the Aswaraopeta borewell.
ISSN:0253-4126
0973-774X
DOI:10.1007/BF02840488