RESERVOIR CHARACTERIZATION USING SEISMIC ATTRIBUTES AND SEISMIC INVERSION OF GLOBIGERINA LIMESTONE RESERVOIR, MADURA STRAIT, INDONESIA

Abstract

To characterize the reservoir in the subsurface, an integration of 3D seismic data and well data is very powerful as it can reveal the lateral and vertical distribution of particular characteristics of the reservoir. This study focuses on the Pliocene age, Mundu Formation in Madura Strait, Indonesia. The reservoir is a bioclastic limestone which is mainly composed of Globigerina planktonic foraminifera tests. This formation has limited producing analogues outside the North East Java Basin which makes this reservoir quite unique. Moreover, there is no published work that discusses in depth about reservoir characterization using seismic attributes and inversion analysis plus the analysis of thinning and thickening of this type of reservoir. The uniqueness of the reservoir is revealed by horizons mapping, analyzing the seismic attributes and inversion analysis. Horizons mapping suggests that the thickness of the reservoir is largely influenced by the uncon-formity surface on its top and base. The analyses of the seismic attributes and inversion depict various characteristics such as fracture potential on the reservoir, predicted hydrocarbon and porosity distribution within the reservoir. Thus, by integration of these various analyses, it is expected that this study can be used for better delineation of the reservoir quality in the study area.