Abstract
Banggai basin is a tertiary basin with potential carbonate reservoir rocks in Indonesia. The heterogeneity of carbonate rock in the Banggai Basin due to both depositional and post-depositional processes, and it is difficult to understand. Commonly, there are several factors which controlling the measurement of acoustic velocity under ambient conditions. Unlike siliciclastic rocks, carbonate rocks, in general, pose unique challenges regarding how porosity affects seismic velocity. Acoustic velocity on carbonate rocks is often influenced by heterogeneity level, particularly in rock fabric and pore type. This study focuses on the relationship of vp/vs ratio, lithofacies, rock fabric, diagenetic, and porosity. The results obtained are expected to be used to define rock class, which is expected to increase the drilling success ratio. The entire analysis was based on 61 core plug samples supported by P and S wave velocity, petrography analysis, and porosity. Petrographic analysis shows predominant lithofacies in Minahaki Formation are grainstone, while Tomori Formation was dominated by muddy carbonate (wackestone to packstone). The relationship of Vp/Vs ratio and porosity is generally obtained a linear trend. In both muddy carbonate and grainstone, Vp/Vs tends to increase with increasing porosity. The two types of carbonate rock can be separated clearly based on Vp/Vs and porosity.
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