Apr 5th -Rock Physics SIG: Correcting Lithology/Fluid Effects for Pore Pressure Analysis*
Sponsored by CGG and Ikon Science
Event Location:
CGG
10300 Town Park Dr.
Houston, TX 77072
NOTE: You Must be Logged in to Register
5:15pm Refreshments
5:30pm Presentation Begins
6:30pm Adjourn
Speaker: Yaping Zhu, Statoil
Shale is the most abundant sedimentary rock, and commonly used methods for pore pressure analysis such as Eaton (1975) and Bowers (1995) methods often focus on rocks with high shale concentration, esp. pure shale. Real rocks, however, generally differ from pure shale in that they have varying lithology and fluid contents, such as sandy shale and shaly sand. To correct for the lithology and fluid effects on rock properties (e.g., velocity and resistivity), we suggest applying lithology and fluid substitutions based on rock physics relationship calibrated to well logs. This allows us construct the pseudo shales that are featured with 100% Vshale, 100% Sw (for water-wet rocks) and background shale porosity. The corrected logs (pseudo logs) can be used for pore pressure analysis. The work is further developed to a pseudo-?LogR approach, where pseudo logs of sonic transit time and resistivity are overlain and properly scaled for the background shale intervals, and differences in sonic and resistivity logs for pseudo shale intervals are correlated to pressure of the corresponding sandy shale and shaly sand intervals. Here we assumed that the rocks are non-source rocks. We use synthetic and real examples to demonstrate the concept.
Biography: Yaping Zhu, Statoil
Yaping Zhu graduated from Tsinghua University in Beijing, China in 2000 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. He currently works for Statoil on pore pressure and geophysical basin modeling projects.
THANK YOU TO OUR GENEROUS SPONSORS:
