OICC Press Iranian Journal of Earth Sciences 2228-785X 16 4 2024 11 04 A work flow for carbonate rock physics modeling: a log-base methodology 1 10 10.57647/j.ijes.2024.1604.20 EN Isti Nur Kumalasari Geophysical Engineering, Engineering Faculty, Universitas Lampung, Bandar Lampung, Lampung, Indonesia https://orcid.org/0009-0007-6402-0085 Ignatius Sonny Winardhi Exploration and Engineering Seismology Research Group, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Bandung, Indonesia https://orcid.org/0000-0001-8563-0498 Rahmat Catur Wibowo Geophysical Engineering, Engineering Faculty, Universitas Lampung, Bandar Lampung, Lampung, Indonesia https://orcid.org/0000-0003-2754-1803 Journal Article 2024 11 04 Rock physics modeling plays an important role in determining the character of carbonate reservoirs.Reservoir characterization in carbonate rocks is more complex because it has various types ofpores. Pore type analysis is very important for considering the analysis of seismic data and alsofor considering the proper drilling technique. Pore type is generally estimated using thin sectiondata, but thin section data is not always available. Thus, in this paper we introduce a rock physicsmodeling workflow in carbonate reservoirs using well log data. The well log data used in thisstudy located in Kujung I Formation, East Java Basin. To get the right elastic property modelof carbonate rock, the main thing that needs to be considered is the estimation of the mineralmatrix modulus and the aspect ratio with various approaches. By using a modified Kumar and Han(2005) method, the aspect ratio of soft pore, reference pore, and stiff pore are 0.09, 0.177, and0.506, respectively. The velocity modeling is done by using Kuster-Toks¨oz equation. The resultsof the elastic properties modeling are close to the actual data. The correlation between the V pKuster-Toks¨oz and the actual V p are 0.9269. While the correlation between the Vs Kuster-Toks¨ozand the actual Vs are 0.9803.