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RhoVe T Method Empirical Velocity-Density-Temperature-Effective Stress TransformNormal access

Author: M. Czerniak
Event name: Second EAGE Workshop on Pore Pressure Prediction
Session: Future Needs and New Research I
Publication date: 19 May 2019
DOI: 10.3997/2214-4609.201900522
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.43Mb )
Price: € 20

The rhob-velocity-effective stress (RhoVe) method represents an empirical approach to pore pressure analysis and calibration that utilizes a series of model-driven, genetically-linked “virtual” rock property relationships. The method is fundamentally a two-parameter approach (a-term and α), that is used to construct a velocity-vertical effective stress (VES) and density-VES family of curves that can be applied to a well of interest where convergence of the two transformed properties offers a robust solution. Once calibrated, the construct represents a fully-populated” petrophysical (shale-only) model volume that can be queried and interrogated to perform advanced calculations leading to a new empirical approach for calculating pore pressure from temperature that both frames the structural-stratigraphic history of fine-grained clastics in a sub-regional setting and allows for an interpretation of local diagenetic effects. The method utilizes a single master power law relationship between temperature and α’ that is applied as an instantaneous series. The same temperature – α’ power law function transforms sonic and density data for the entire stratigraphic section. Accounting for the effects of ongoing chemical compaction and diagenesis using alternate associations like temperature extends the predictability of high-velocity, high-density, low-effective stress rock types such as those found in the Deepwater GOM mudstones and shales.

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