What is dipmeter data?
dipmeter log A down-hole geophysical log designed to measure the dip and dip direction of dipping surfaces in a borehole. It is claimed that dipmeter data can be used to identify tectonic as well as sedimentary structures. In practice, the data are often equivocal and must be interpreted with great caution.
How does a dipmeter Tool Work?
The dipmeter is a tool with arms arranged radially around a central mandrel with pads pressed against the borehole wall by a spring mechanism. Each pad measures the microresistivity of the formation. By correlating a microresistivity feature across the borehole, a plane can be defined and its dip and strike computed.
What is the use of dip meter?
The main purpose of the dip meter measurement is to obtain structural dips of the layers traversed by the borehole. This is achieved by recording variations in the rocks’ electrical properties along tracks of the borehole wall, and by correlat- ing these curves.
What do resistivity logs measure?
Resistivity logging is a method of well logging that works by characterizing the rock or sediment in a borehole by measuring its electrical resistivity. Resistivity is a fundamental material property which represents how strongly a material opposes the flow of electric current.
Why is resistivity important?
The resistivity of materials is important as it enables the right materials to be used in the right places in electrical and electronic components. Materials used as conductors, for example in electrical and general connecting wire need to be able to have a low level of resistivity.
How do you interpret resistivity logs?
Three depths of resistivity can be logged (shallow, medium, and deep) that record the resistivity of the formation with increasing distance away from the borehole. Resistivity logs can be interpreted to infer information about the porosity of a formation, the water saturation, and the presence of hydrocarbons.
What instrument measures radio waves?
An absorption wavemeter is a simple electronic instrument used to measure the frequency of radio waves.
What is resistivity testing?
Soil resistivity testing is the process of measuring a volume of soil to determine the conductivity of the soil. The resulting soil resistivity is expressed in ohm-meter or ohm-centimeter. Soil resistivity testing is the single most critical factor in electrical grounding design.
What causes resistivity?
The resistivity of a material is dependent upon the material’s electronic structure and its temperature. For most (but not all) materials, resistivity increases with increasing temperature.
What does high resistivity mean?
Electrical resistivity is a measure of a material’s property to oppose the flow of electric current. This is expressed in Ohm-meters (Ω⋅m). A high resistivity means that a material does not conduct electric charge well.
What do you measure with a dipmeter tool?
The dipmeter tool measures conductivity or resistivity changes, hole size, and sonde orientation-nothing more, nothing less. It does not directly measure the dip of bed boundaries or the dip of lithology changes.
Can a dipmeter be used for a resistivity scale?
Dipmeter surveys, particularly those with a calibrated resistivity scale, can be used for this purpose. Several descriptive properties can be derived from the dipmeter survey: By establishing a cutoff line as shown, everything to the right can be identified as sand and everything to the left as shale.
Which is the most common presentation of dipmeter data?
The most common presentation of dipmeter data is the arrow or tadpole plot, which is a clever two-dimensional representation of a three-dimensional quantity.
How is the Dipmeter used in the petroleum industry?
Since its introduction in the 1930s, the dipmeter tool has found steadily increasing application in the petroleum industry. Used initially in exploration, the tool helped to locate and identify the major features of geologic structure serving as oil traps.