asbogstudy7

A unit of measurement of gamma rays. American Petroleum Institute

A screlike boring tool used in relatively unconsolidated near surface materials

The science of recording and analyzing measurements of physical properties made in wells or test holes

A well log that shows the variations with depth in the diameter of an uncased borehole

A heavy metal pipe lowered into a borehole and cemented in place to prevent cave-in, loss of dirlling fluid, and unwated fluids from entering the borehole

A cone-shaped tool at the end of a hollow steel rod is pushed into the ground to record resistance to insertion, formation pore pressure, and electrical resistivity of the subsurface geology

The radioactivity log curve of the intensity of natural gamma radiation emitted from the rocks in a borehole. It is commonly used to differentiate between shale (with a high gamma reading) and other sedimentary rocks

A series of measurements made by a gravimeter at a number of different locations in the field to determine the density distribution by evaluating the gravitational pull

A transitional zone in a borehole located between the flushed zone and the uninvaded zone. It refers to the degreee ot which the mud filtrate penetrates the formation fluids, resulting in a transition from the mud filtrate saturation to the formation water saturation

A radioactiviy log curve of the intensity of radiation produced when the rocks in a borehole are bombarded byt neutrons. It indicates the presence (but not type) of fluid. It is often used in association with the gamma ray log to distinguish porous and nonporous formations

A log that makes measurements of the resisitivity of formations using 4 electrodes set up in a stadard 16- or 64-inch spacing

An in-situ test that determines the suitability of a soil for a sweage disposal system (leachfield)

A log that makes qantitative measurements of the specific resistance of a materail to the flow of an electric current

The ease with which soil or rock can be excavated mechanically

The chief method of drilling deep wells. A drill bit grinds a hole in the rock, and lubrication and cooling are provided by continuously circulating drilling mud which brings the well cuttings to the surface

A survey method that utilizes the travel times of seismic waves that are reflected back from deep formations giving a deatailed picture of subsurface structures.

A survey method based on the travel times of the seismic waves that pass through materials of differeing densities, in order to map the layers

A thin-walled, push-tube sampler that obtains undisturbed samples of cohesive soils

A log that measures the resistivity using two electrodes and having a limited area of investigation from 5 to 10 times the electrode diameter

A thick-walled barrel sampler that obtains distrubed soil samples and that is used in the Standard Penetration Test

A log of the difference in DC voltage between an electrode in a well and an electrode at the surface. The difference in voltage is mostly a result of the electrochemical potentials that develop between dissimilar borehol and formation fluids

A standardized soil sampling procedure in which a 140-pound hammer is dropped 30 inches, driving a two-inch split-spoon sampler 18 inches. The blow count to drive the sampler through the last 12 inches is correlated with soil conditions

A pit easliy dug with a backhoe to obtain bulk samples and to identify subsurface materials in situ

A graphic record of the measured physical characteristics of a rock section encountered in a well plotted as a function of depth

• 1. Bringing cuttings up from the bottom of the hole
• 2. Suppoting the walls of the hole
• 3. Preventing or reducing fluid loss through the wall of the borehole
• 4. Keeping the drill bit cool and lubricated