Use of reflection tomography to predict pore pressure in overpressured reservoir sands

Deterministic pore pressure estimation for shaly sand formations through conventional petrophysical data and integrated 1D geomechanical approach

“…Following Sayers et al (2003) and Doyen et al (2004), we start from an empirical expression of P-wave velocity as a function of , pore pressure , overburden pressure , porosity ∅, shale volume , and oil volume .…”

“…The calibration process of our proposed equation defined in previous steps, was done by adjusting the effective pressure (PP_ef in bars units) and -(V_DIFF in km/s units), following Bowers conventional power law curve fitting method (Sayers, 2003) using available well data, as observed in Fig. 2.…”

“…Very often, such relations have been indiscriminately applied for all formation types including reservoir sands. It was not until a decade later that authors, led by Carcione et al (2002), Dvorkin et al (2002), Sayers et al (2003) and Doyen et al (2004), proposed new models for pore pressure estimation in reservoir rocks, what represents an advance for the pore pressure studies.…”

Use of prestack depth migration for improving the accuracy of horizontal drilling in unconventional reservoirs

“…Another immediate application that can be performed directly in the depth domain is pore-pressure prediction. Some research has been done in this area (Sayer et al, 2003). Correctly transferring the seismic data to depth domain using PSDM, and staying in depth to avoid any pitfalls caused by stretching the data from one domain to another, is obviously very desirable.…”

PyGeoPressure: Geopressure Prediction in Python

“…Both of these two kinds of predictions are implemented in pyGeoPressure. In addition to standard methods of Eaton's(Eaton & others, 1975) and Bowers'(Bowers & others, 1995), a new multivariate prediction model (Sayers et al, 2003) is also implemented in pyGeoPressure which incorporates petrophysical properties like porosity and shale volume other than sonic velocity. Another set of functionalities that pyGeoPressure provides are generating graphs.…”