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Rock characterization of rupelian-chatian Asmari carbonate formation using the simultaneous pre-stack inversion technique and lame parameters in the Kopal oilfield, Dezful embayment, Zagros basin

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Abstract

The main aim of this study is to integrate the results of sedimentology, strontium isotope with the results simultaneous inversion of 3D seismic data for rock characterization of Rupelian-Chatian Asmari Formation. Using the simultaneous inversion of prestack seismic data variations of rock properties in the Rupelian-Chatian Asmari Formation were interpreted. In this regard, lame coefficients, compressive velocity (Vp), shear velocity (Vs) and compressive-to-shear velocity ratio (Vp/Vs) were extracted from prestack 3D seismic data. Converting shear impedance (SI) and acoustic impedance (AI) to LMR (Lambda-Mu-Rho) provides a more comprehensive understanding of the subsurface rock properties. Based on AI, SI, and lame coefficients, the Rupelian-Chatian Asmari Formation was divided into the lower part and the upper part. The upper part of the Asmari Formation shows a relatively low lame parameters indicating sigmoid patterns composed of shale and sandstone. In contrast, the upper part of Asmari Formation is composed of cyclic carbonate sediments mainly mainly limestone and dolomite. This interval is associated with variations in the lame coefficients, P and S- impedances indicating clinoform patterns. The downlap and top lap termination observed in lame coefficient sections indicate the movement of clinoforms from southwest (shallow) to northeast (deep). The results of this study show that during the Rupelian Chatian time, the coastal part of the Asmari Sea was situated in the southwest of the Kopal Oilfield, while the deeper part was located in the northeast of the field. This study shows that the simultaneous inversion of seismic data combined with sedimentological and geochemical can effectively aid in lithology detection, sequence stratigraphy and depositional setting analysis.

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Acknowledgements

This research is part of the first author’s Ph.D. dissertation and is supported by the Faculty of Mining Engineering, Sahand University of Technology, Tabriz, Iran. National Iranian South Oil Company (NISOC) provided logistical support for this project. We thank the National Iranian South Oil Company (NISOC) for providing the data and for permission to publish this research.

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Authors and Affiliations

  1. Faculty of Mining Engineering, Sahand University of Technology, Tabriz, Iran

    Zargham Mehdipour & Navid Shad Manaman

  2. Earth Sciences Department, Faculty of Natural Science, University of Tabriz, Tabriz, Iran

    Ali Kadkhodaie

  3. National Iranian South Oil Company, Ahvaz, Iran

    Ahmad Ashtari

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  1. Zargham Mehdipour
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  2. Navid Shad Manaman
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  3. Ali Kadkhodaie
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Mr Zargham Mehdipour prepared the first draft of the manuscript. Navid Shad Manaman and Ali Kadkhodaie reviewed the manuscript. Ahmad Ashtari has provided data and some technical consultancy.

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Correspondence to Navid Shad Manaman.

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Mehdipour, Z., Shad Manaman, N., Kadkhodaie, A. et al. Rock characterization of rupelian-chatian Asmari carbonate formation using the simultaneous pre-stack inversion technique and lame parameters in the Kopal oilfield, Dezful embayment, Zagros basin. Carbonates Evaporites 39, 53 (2024). https://doi.org/10.1007/s13146-024-00970-5

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