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Abstract

Summary

This contribution presents a new workflow for compaction analysis and top seal evaluation by wireline logging data. Sonic and density logs from nine key wells in the Vienna Basin (Austria), providing a continuous depth record from 0 to 3500 m true vertical depth (TVD), were filtered by natural gamma ray, resistivity, delta rho, and caliper to bit size, to identify mudstone intervals with reliable sonic and density signals. The calculated sonic- and density-porosity depth-trends were then quality-checked with core petrophysical data, e.g., helium-porosity and hydrocarbon column heights (HCHs) calculated based on true displacement radii from mercury intrusion capillary porosimetry (MICP). Furthermore, both porosity logs were corrected by their regressions with corresponding helium-porosity values from equal depths to obtain reliable log-based compaction models. Based on these models and the relationship between helium-porosity vs. HCH from MICP, log-based HCH vs. TVD curves were generated. In conclusion, both sonic- and density-porosity trends represent the core petrophysical data well. The HCH model based on density-porosity changed more significantly upon correction, after which both sonic- and density-based HCH trends plot similarly and allow for upscaling of the core petrophysical data to all wells with available wireline logs.

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/content/papers/10.3997/2214-4609.202335021
2023-11-27
2025-11-07

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References

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/content/papers/10.3997/2214-4609.202335021
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Mudstone Compaction in the Vienna Basin: Insights from Lithology-Filtered Sonic and Density Logs
Conference Proceedings 2023, 1 (2023); https://doi.org/10.3997/2214-4609.202335021
/content/papers/10.3997/2214-4609.202335021
/content/papers/10.3997/2214-4609.202335021
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