What does a resistivity log 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.

How do you read lithology?

Lithology can therefore be interpreted directly from neutron values only when porosity is insignificant. In porous rocks, the neutron log must be interpreted in combination with other logs such as formation density.

What does a well log tell you?

Well logs present a concise, detailed plot of formation parameters versus depth. From these plots, interpreters can identify lithologies, differentiate between porous and nonporous rock and quickly recognize pay zones in subsurface formations.

What does high resistivity mean?

A high resistivity means that a material does not conduct electric charge well. Electrical resistivity is defined as the relation between the electric field inside a material, and the electric current through it as a consequence: ρ=EJ.

What are the types of resistivity logs?

Resistivity Logging. There are three main categories of well Logging: Electrical, Nuclear and Acoustic/Sonic.

What does lithologic mean?

1. The gross physical character of a rock or rock formation. 2. The microscopic study, description, and classification of rock. lith′o·log′ic (lĭth′ə-lŏj′ĭk), lith′o·log′i·cal adj.

How would you describe lithology?

Definition of lithology 1 : the study of rocks. 2 : the character of a rock formation also : a rock formation having a particular set of characteristics.

Why is well logging important?

Well logs are important to the petroleum industry because they provide numerous rock property measurements, like the reservoir conditions of pressure, temperature, and fluid content. The quality of well logs can vary significantly from one well to the other.

What is a low resistivity?

A low resistivity indicates a material that readily allows the movement of electric charge. It is an intrinsic property that quantifies how strongly a given material opposes the flow of electric current. Resistivity is commonly represented by the Greek letter (rho).