Rock Physics SIG: Evolutionary Rock Physics for Mudrock Pressure Modeling - Nov 13th
Event Location:
CGG
10300 Town Park Dr.
Houston, TX 77072
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Speaker: Yaping Zhu, Equinor
Co-authors: Yaping Zhu, Bruce Hart, Dan Ebrom, Jim Kalinec, Lars Wensaas
Pore pressure prediction in unconventional plays can be challenging, especially where lithology varies significantly. This is because the relationships between properties such as porosity, elasticity, and effective stress vary by rock type and are affected by geologic history. Here we describe a new rock-physics based pore-pressure modeling workflow that is potentially useful in areas where large lithologic variations are present, such as our Eagle Ford study area.
We use an inclusion-based rock-physics model that jointly simulates the evolution of velocity and pressure through geologic time. For any given initial sediment composition, burial history information is used to model the diagenetic evolution processes (porosity loss/creation, organic maturation, etc.), which controls the changes in mineral composition, fluid content and microstructure. By linking these changes to velocity and pressure through rock model calibrated to local geology, we simulate pore pressures and compare the velocity predictions to sonic logs to independently evaluate the accuracy of our results. We offer this integrated workflow as an additional approach to pore-pressure analysis of unconventional mudrock.
Speaker Biography: Yaping Zhu, Equinor
Yaping Zhu graduated from Tsinghua University in Beijing, China and received his PhD in Geophysics from Center for Wave Phenomena (CWP) at Colorado School of Mines in 2006. From 2006 to 2013, he worked for ExxonMobil Upstream Research Company as a research specialist and ExxonMobil Exploration Company as an exploration geophysicist. Since then he joined Statoil (renamed to Equinor in May 2018) as a researcher. He currently works on rock physics and deep learning projects.
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5:15pm Refreshments
5:30pm Presentation Begins
6:30pm Adjourn
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