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ABSTRACT: A Quantitative Analysis of Seismic Attributes for Prediction of Reservoir Parameters Using 3-D Seismic Data in a Gas Bearing Deltaic Sequence, Mid Tapti Field, West Coast Offshore, India

Bhandari, S. K., S. Nayak, A. K. Johrie, V. K. Dhanwada, Y. M. S. Reddy, and G. S. Naidu , Oil & Natural Gas Corporation Ltd, Mumbai, India

Early Miocene-Oligocene shallow marine deltaic gas bearing sandstone reservoirs are deposited in a passive divergent margin setup in western offshore of India. In early exploration history, the structures were mainly defined using 2D seismic data.

3-D seismic data allowed seismic attributes to be used in reservoir characterization, structural mapping and stratigraphic interpretations. Seismic attributes have enhanced interpretation quality by imaging the channel orientation in a complex deltaic regime. Although thin sandstones in the channels are not resolvable from seismic signatures high amplitude reflections in attribute mark the axes of the channels. Seismic attributes are calibrated with lateral variations in pay thickness, porosity and gas saturation of different units. This paper outlines a method that establishes a relationship between various reservoir properties (pay thickness, porosity and gas saturation) and seismic attributes (amplitude, frequency and energy half-time). The resultant hydrocarbon volume maps are used for optimum placement of development wells in a discovery.

AAPG Search and Discovery Article #90913©2000 AAPG International Conference and Exhibition, Bali, Indonesia