Pore-type identifcation of a heterogeneous carbonate reservoir using rock physics principles: a case study from south-west Iran

• Autorzy: Emami Niri Mohammad , Mehmandoost Fariba , Nosrati Hossein

Identyfikatory

DOI

10.1007/s11600-021-00602-9

• Języki publikacji: EN

Abstrakty

EN

The characterization of carbonate rocks is a challenging process compared to siliciclastics because of their more intricate pore-space structure. In this study, we applied rock physics methods to a heterogeneous carbonate reservoir located in southwest Iran to identify zones of various pore types, including inter-particle pores, stif (vuggy and moldic) pores, and cracks, from geophysical measurements. We frst constructed two rock physics templates (RPTs) using well logs and used them to quantitatively analyze the efect of various pore types on elastic properties. Using these RPTs, we then implemented an inversion algorithm to estimate the volume fractions of various pores using total porosity and P-wave velocity (Vp) derived from well logs. Next, we have compared the pore-type inversion results and the image log interpretation/core images at the corresponding depth intervals to validate inversion results. This comparison showed that the inversion results are consistent with the measurements. Also, we applied the introduced pore-type inversion algorithm on seismic data to achieve insight into pore-type distribution in the 3D framework of the reservoir under study. The results of these rock physics-based analyses indicate that the inter-particle pores are dominant in the pore-space, while there are stif pores and dispersal cracks in some subzones of the studied depth interval. Additionally, employing the Xu and Payne rock physics modeling procedure, P- and S-wave velocities were estimated using pore-type inversion results at the location of several wells from the studied feld. The calculated mean absolute error and the correlation coefcient indicate a high consistency between the measured and modeled velocities. This research may contribute to permeability prediction and analysis of the diagenetic processes’ impact on reservoir properties.

Słowa kluczowe

EN

rock-physics modelling; rock physics template; pore-type characterization; carbonate rocks; seismic inversion

PL

modelowanie fizyki skał; szablon fizyki skał; charakterystyka typu porów; skały węglanowe; inwersja sejsmiczna

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2021
• Tom: Vol. 69, no. 4
• Strony: 1241--1256
• Opis fizyczny: Bibliogr. 43 poz.

Twórcy

autor

Emami Niri Mohammad

• Institute of Petroleum Engineering, College of Engineering, University of Tehran, Tehran, Iran

• https://orcid.org/0000-0002-4814-1289

autor

Mehmandoost Fariba

• School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran

autor

Nosrati Hossein

• Institute of Petroleum Engineering, College of Engineering, University of Tehran, Tehran, Iran

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