Lost Circulation Refers to the loss or escape of drilling fluid into permeable zones made up of fractured or porous...

Mafic A geological term referring to igneous rocks that are equivalent to basalt and diorite in composition.

Magma Molten rock typically having a temperature between 800° and 1100° C (~1500-2000° F). Magma is the source of...

Magnetotelluric (MT) Geophysical Method Makes use of naturally occurring electromagnetic waves to image the...

Microseismicity Tiny earthquakes that result from slip or shear along a fracture caused by an uneven distribution of...

Mineral Geothermometer A secondary mineral phase whose stability is defined by a lower and sometimes an upper...

Mud Pots and Mud Pools Depressions filled with hot bubbling mud commonly associated with steaming ground. The mud is...

MWD Refers to Measurement While Drilling which for directional drilling includes geospatial information that is used...

Numerical Modeling Application of computational methods to solve complex problems that predict the behavior or the...

Normal Fault High angle fault that results from extensional stress and forms a steeply dipping planar structure. Slip...

Packers and Plugs Downhole devices emplaced into a well to seal zones and intervals so they can be pressurized by...

PDC Drill Bit Polycrystalline diamond compact drill bits have been long used in oil and gas drilling, and only...