What is it about?
Since hydrocarbon generation requires specific temperature and other conditions, we roughly divide the pore pressure into two parts: under-compaction in the early stage and hydrocarbon generation after reaching the hydrocarbon generation threshold. We propose a petrophysical model for estimating the normal compaction trend before hydrocarbon generation, modify the bulk modulus of the model, and use the bulk modulus method to calculate the pressure generated by under-compaction; the pressure is added to obtain the final pore pressure.
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Why is it important?
Overpressure is often associated with the hydrocarbon-generating zone.During the thermal transformation of the source rock with 10% kerogen volume, consuming half of the kerogen can generate an overpressure of 10 MPa. It can be seen that the hydrocarbon generation pressurization has a great influence on the source rock’s pore pressure.
Perspectives
Hydrocarbon generation pressurization is a factor that cannot be ignored in evaluating pore pressure anomalies.
Jiale Zhang
Read the Original
This page is a summary of: Estimation of pore pressure considering hydrocarbon generation pressurization using Bayesian inversion, Interpretation, February 2023, Society of Exploration Geophysicists, DOI: 10.1190/int-2022-0082.1.
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