ABSTRACT

We use a workflow that combines various sources of information, such as mud weights, well logs, basin history, and diagenesis, to model pore pressure-velocity relationship based on rock physics principles. This produces velocity templates, which can be used to build velocity models for imaging and inversion. We apply this workflow to a data set from the Gulf of Mexico. We study the diagenesis of shale, particularly, smectite-illite reaction. From well logs, we build models for velocity-porosity and density-overburden relations. Thermal history is approximated from available Bottom Hole Temperature (BHT) data and depositional history is inferred from interpreted horizons. We use mud weight data to calibrate pore pressure-velocity transformation. A number of different pore pressure gradient scenarios result in different velocity profiles or templates. The integration and calibration of many sources of data in this workflow ensure the resulting velocity model is geologically feasible and physically plausible.

Presentation Date: Monday, October 15, 2018

Start Time: 1:50:00 PM

Location: 202A (Anaheim Convention Center)

Presentation Type: Oral

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