Gravity Data Decomposition Based on Spectral Analysis and Halo Wavelet Transform, Case Study at Bird's Head Peninsula, West Papua
DOI:
https://doi.org/10.5614/j.eng.technol.sci.2017.49.4.1Keywords:
gravity, Halo wavelet, spectral analysis, Indonesia, Papua New Guinea.Abstract
Gravity imagery is commonly used in the preliminary study of sedimentary basins. Gravity data have an excellent lateral resolution but poor vertical resolution. The gravity response represents the superposition of all elements of differing density contrasts and depthsfor a given region below the surface. The ability to perform depth-based gravity data decomposition is important for the interpretation of the data. This can be achieved by combiningspectral analysis withthe Halo wavelet transform. The decomposition method was tested using synthetic data as well as field data collected at Bird's Head Peninsula, West Papua. Examination of the proposed method using the synthetic data produced satisfactory results that corresponded well to the models. The test using the field data clearly imaged anticline structures that formed due tothe ongoing collision of the Australia Continental Plate and the Pacific Oceanic Plate. In part of the Lengguru Fold and Thrust Belt, the folding structures are not imaged at depths greater than ~6 km. We proposethat folding structures are not found at deeper levels. The gravity imagery also indicates that the Sorong Fault Zonebreaks apart into several segments, which causes other perpendicular lineaments(strike-slip faulting). These strike-slip faults are clearly visible in the Bird's Head Region.
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References
White, L.T., Morse, M.P. & Lister, G.S., Lithospheric-Scale Structures in New Guinea and Their Control on The Location of Gold and Copper Deposits, Solid Earth 5, 5(1), pp. 163-179 (doi:10.5194/se-5-163-2014), 2014.
Ghuo, L., Meng, X., Chen, Z., Li, S. & Zheng, Y., Preferential Filtering for Gravity Anomaly Separation, Computer & Geosciences, 51, pp. 247-254, 2013.
Fedi, M. & Quarta, T., Wavelet Analysis for the Regional-Residual and Local Separation of the Potential Field Anomalies, Geophys Prospect, 46(5), pp. 507-525, 1998.
Ucan, O.N., Seker, S., Albora, A.M. & Ozmen, A., Separation of Magnetic Field in Geophysical Studies Using a 2-D Multi-Resolution Wavelet Analysis Approach, J. Balkan Geophysics Soc., 3(3), pp. 53-58, 2000.
Yang, W.C., Shi,Z.Q. & Hou, Z.Z., Discrete Wavelet Transform for Multiple Decomposition of Gravity Anomalies, Chin. J. Geophys, 44(4), pp. 529-537, 2001.
Lyrio, J.C.S., Tenorio, L. & Li, Y., Efficient Automatic Denoising of Gravity Gradiometry Data, Geophysics, 69(3), pp. 772-782, 2004.
Martelet, G., Sailhac, P., Moreau, F. & Diament, M., Characterization of Geological Boundaries Using 1-D Wavelet Transform on Gravity Data: Theory and Application to the Himalayas, Geophysics, 66(4), pp. 1116-1129, 2001.
Saihac P. & Gilbert D., Identification of Sources of Potential Fields with the Continous Wavelet Transform: Two-Dimensional Wavelet and Multipolar Approximations, J. Geophys. Res., 108(B5), pp. 2262, 2003.
Naidu, P., Spectrum of the Potential Field Due to Randomly Distributed Sources, Geophysics, 33(2), pp. 337-345, 1968.
Dampney, C.N.G., The Equivalent Source Technique, Geophysics, 34(1), pp. 39-53, 1969.
Xu, Y., Hao, T., Li, Z., Duan, Q. & Zhang, L., Regional Gravity Anomaly Separation Using Wavelet Transform and Spectrum Analysis, Journal of Geophysics and Engineering, 6(3), 2009.
Koornwinder, T.H., Wavelet: An Elementary Treatment of Theory and Applications, pp. 1-12, World Scientific Publishing Co. Inc., 1993.
Kumar, Praveen & Foufoula-Georgiou, Efi, Wavelet Analysis in Geophysics: An Introduction, Academic Press California, United States of America, 1994.
Dallard, T. & Spedding, G.R., 2D Wavelet Transform, Preprint, 1990.
Blakely, R.J., Potential Theory in Gravity and Magnetic Application, Cambridge University Press, 1995.
Telford, W.M., Geldart, L.P. & Sheriff, R.E., Applied Geophysics, 2nd Edition, Cambridge University Press, Cambridge, 2004.
Extract XYZ Grid - Topography or Gravity, http://topex.ucsd.edu/cgi-bin/get_data.cgi.
Fullea, J., Fernandez, M. & Zeyen, H., FA2BOUG - a FORTRAN 90 Code to Compute Bouguer Gravity Anomalies from Gridded Free-Air Anomalies: Application to the Atlantic Mediterranean Transition Zone, Comput. Geosci., 34 (12), pp. 1665-1681, 2008.
Tobing, S.L., Robinson, G.P. & Ryburn, R.J., Geological Map of the Kaimana Sheet Scale 1:250.000, Irian Jaya, GRDC, Bandung, 1990.
Sapiie, B., Naryanto, W., Adyagharini, A.C. & Pamumpuni, A., Geology and Tectonic Evolution of Bird Head Region Papua, Indonesia: Implication for Hydrocarbon Exploration in Eastern Indonesia, Search & Discovery Article, No. 30260, 2012.
Ikhwanudin, F. & Abdullah, CI., Indication Strike Slip Movement a Part of Sorong Fault Zone in Yapen Island, Papua, Indonesia, GSTF Journal of Geological Sciences (JGS), 2(1), pp. 25-33, 2015.
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