Harnanti Y. Hutami, Tiara Larasati Priniarti, Ign. Sonny Winardhi, Handoyo
The low porosity and permeability shale are nowadays known as self-resourcing reservoirs. In the unique organic shales, TOC has a significant contribution to the elastic properties of rocks. TOC behaves like porosity to a density log and effects in decreasing density. To reduce the uncertainty due to TOC and mineral variability effect, a quantitative interpretation of shale reservoirs should be done properly to obtain the best image of shale systems. In this study, we built rock-physics templates (RPT) to estimate seismic response by defining the relationship between total organic carbon (TOC) and effective elastic properties of shale reservoirs of a data set from South Sumatera Basin, Indonesia. RPT is carried out by incorporating the amount of organic matter into shale pore space as a solid-filling inclusion. Moreover, shale porosity is assumed to be fully water-saturated determined by the in-situ conditions. We have estimated the general distribution of pore geometry by investigating aspect ratio from the dataset. A solid background of shale from several different minerals is estimated by using effective medium theory. Properties of porous rocks for solid pore infill are estimated from a generalization of Brown-Korringa Equation. Effective elastic properties of bulk rock frame filled with a fluid are obtained from Gassmann equations. Results show that increasing the TOC volumes generally reduces both P-wave and S-wave velocities, acoustic impedance, and density. On the contrary, the vp /vs ratio increased as the impact of immature organic matter which will be more affecting shale rigidity than its compressibility. © 2019, Pusat Penelitian dan Pengembangan Teknologi Minyak dan Gas Bumi. All rights reserved.
Geophysics Engineering Department, Institut Teknologi, South Lampung, Sumatera, 35365, Indonesia; Geophysics Engineering Department, Faculty of Mining and Petroleum Engineering, Institut Teknologi, West Java, Bandung, 40132, Indonesia; Facultat de Ciencies de la Terra, Universitat de Barcelona, Spain
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