Pressure shale

Pressure shale is shale that has been exposed to high pressures that causes it to fracture, usually into large concave pieces.^: §2.3.3 In mud logging, watching for this type of shale is one method of monitoring for the possibility of drilling into high pressures that might cause a blowout.

References

↑ Gholami, Raoof; Elochukwu, Henry; Fakhari, Nikoo; Sarmadivaleh, Mohammad (February 1, 2018). "A review on borehole instability in active shale formations: Interactions, mechanisms and inhibitors". Earth-Science Reviews. 177: 2–13. doi:10.1016/j.earscirev.2017.11.002. hdl:20.500.11937/59302. ISSN 0012-8252.

This article related to natural gas, petroleum or the petroleum industry is a stub. You can help Wikipedia by adding missing information.

[gholami2018-1] Gholami, Raoof; Elochukwu, Henry; Fakhari, Nikoo; Sarmadivaleh, Mohammad (February 1, 2018). "A review on borehole instability in active shale formations: Interactions, mechanisms and inhibitors". Earth-Science Reviews. 177: 2–13. doi:10.1016/j.earscirev.2017.11.002. hdl:20.500.11937/59302. ISSN 0012-8252.