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The AAPG/Datapages Combined Publications Database

Indonesian Petroleum Association

Abstract


Proceedings of an International Conference on Gas Habitats of SE Asia and Australasia, 1999
Pages 187-203

Seismic Previous HitSpectralNext Hit Signatures of the Badak Oil and Gas Field, Onshore Kutei Basin, Kalimantan, Indonesia: An Example of Seismic Reservoir Imaging and Characterization

Arif Wibowo, Jeff Towart, James Dirstein, Maher Maklad

Abstract

While attenuation zones ("dim-spots") have been visually noted on seismic sections associated with some hydrocarbon accumulations for almost twenty years (Taner and Sheriff, 1977; Anstey, 1977; Dobrin, 1984), early attempts at measuring attenuation in the laboratory and from seismic data met limited success. Work during the mid eighties set the stage for further investigation and development of these ideas, including discussions of a frequency dependent attenuation model by Terry Jones (1986) and experimental work by Bourbie et al. (1986) demonstrating that gas attenuates more P wave energy than water in rock pores.

Factors affecting the Previous HitspectralNext Hit character of the seismic data generally fit into two categories (Dilay and Eastwood, 1995). The first is a lithological factor where the Previous HitspectralNext Hit character changes in response to time-thickness variations within a formation or a group of formations. The second is a petrophysical factor where Previous HitspectralNext Hit attributes can also be used to estimate the attenuation characteristics of a certain formation. It has been experimentally established that fluid-bearing porous rock formations attenuate seismic waves preferentially (i.e. higher frequencies within the seismic band are more severely attenuated than lower frequencies). Generally, gas attenuates seismic energy more than oil, and oil attenuates more than water.

Previous HitSpectralNext Hit analysis was used to measure the attenuation of seismic frequencies beneath the Badak oil and gas field, located in the Sanga-Sanga PSC in East Kalimantan, Indonesia. This study utilized recently developed techniques for Previous HitspectralNext Hit and attenuation analysis (Maher, 1988). The Previous HitspectralNext Hit analysis method employed in the study contains several proprietary algorithms to overcome some limitations of previous methods for measuring attenuation from stacked seismic data. Comparison with AVO attributes indicates that Previous HitspectralTop analysis provides additional information necessary to characterize the deeper reservoirs.


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