LITHOLOGY AND RESERVOIR IDENTIFICATION IN THE “EL” WELL, EAST JAVA USING SEISMIC INVERSION

Maulana Yusuf Ibrahim, Salma Dita Rysqi Puspita, Zhafirah Nurul Syarafina, Shaska Ramadhan Zulivandama, Eleonora Agustine

DOI: http://dx.doi.org/10.32693/bomg.38.1.2023.818

Abstract


The acoustic impedance inversion seismic method, carried out at the "EL" well in East Java,

provides a description of the physical properties of subsurface rocks. This method involves identifying rock

layers, lithology types, porosity values, the presence of hydrocarbons, and fluids in the target zone using

both well data and integrated seismic data. The data processing included the cross-plotting of acoustic

impedance (AI) with gamma ray logs, porosity logs, and resistivity logs. We integrated seismic and well

data, picked horizons, and created AI inversion models. The based model inversion technique was used to

compare the synthetic model with the seismic data, aiming to obtain an AI value that closely represents the

actual model. AI seismic inversion effectively separates lithological boundaries vertically and laterally,

based on the selected picking horizon and created model. To enhance understanding of the lithology and

hydrocarbon prospect zone in the study area, a cross-plot analysis was used to correlate the seismic inversion

model. The results reveal that the study area represents a hydrocarbon prospect zone, with reservoir rocks

consist of coral and foram at a depth range of 2320 - 2430 ft.


Keywords


acoustic impedance (AI), seismic inversion, lithology, hydrocarbon prospect zone

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DOI: http://dx.doi.org/10.32693/bomg.38.1.2023.818

Accredited by Ministry of Research, Technology, and Higher Education, Republic Indonesia 

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