What does a well log tell you?

What does a well log tell you?

Well logs present a concise, detailed plot of formation parameters versus depth. Logging tools record the magnitude of a specific formation property, such as resistivity, measured as the tool traverses an interval defined by depth; a well log is a chart that shows the value of that measurement plotted versus depth.

How do well logs work?

How Does Oil Well Logging Work? During oil well logging, the logging tool is lowered into the borehole via a cable. Relevant data is transmitted electrically through the cable to the surface, where they are digitally and continuously recorded as a function of the depth of the formation.

What are the types of well logs?

Well Log Techniques

• Acoustic Logs. Cement Bond Log. Cross-Dipole Acoustic Log.
• Caliper Log.
• Chemical Logging.
• Density Log.
• Gamma Log.
• Image Logs.
• Mud Logging.
• Neutron Log.

What is a logging tool?

1. n. [Formation Evaluation] The downhole hardware needed to make a log. The term is often shortened to simply “tool.” Measurements-while-drilling (MWD) logging tools, in some cases known as logging while drilling (LWD) tools, are drill collars into which the necessary sensors and electronics have been built.

What does it mean to log an oil well?

borehole logging
Well logging, also known as borehole logging is the practice of making a detailed record (a well log) of the geologic formations penetrated by a borehole. Some types of geophysical well logs can be done during any phase of a well’s history: drilling, completing, producing, or abandoning.

What are the well logging tools?

Presents the commonly used logging tools–SP, gamma ray, resistivity and porosity–and their characteristics and functions including coverage of Magnetic Resonance Logging….Content:

• Magnetic Resonance Logs.
• Spontaneous Potential Log.
• Gamma Ray Log.
• Resistivity Logs.
• Dielectric Logs.
• Density Logs.
• Neutron Logs.
• Acoustic Logs.

Which logs should be monitored?

Top 10 Log Sources You Should Monitor

• 1 – Infrastructure Devices. These are those devices that are the “information superhighway” of your infrastructure.
• 2 – Security Devices.
• 3 – Server Logs.
• 4 – Web Servers.
• 5 – Authentication Servers.
• 6 – Hypervisors.
• 7 – Containers.
• 8 – SAN Infrastructure.

Can you run a well log inside a cased well?

The gamma ray log is particularly useful as shale beds which often provide a relatively low permeability cap over hydrocarbon reservoirs usually display a higher level of gamma radiation. These logs were important because they can be used in cased wells (wells with production casing).

What is petroleum logging?

Well logging, as it applies to the petroleum industry, is used to identify oil and gas intervals, and quantify properties of reservoir rock by placing various types of sensors in the borehole. The signatures are then analyzed to evaluate the formation properties that are of interest for producing oil and gas.

What can a well log tell us about our reservoir?

By Dosh Nazlan, Petrophysicist. Petrophysicists look at the well log patterns, recognize the trends, and then turn those patterns into reservoir knowledge. Well logs can tell us many stories about our reservoir. Each colorful line, each curve deflection and each curve type create the story of our reservoir.

What is the best way to start studying logging?

Perhaps the best way to begin a study of logging is by introducing the reader to some of the basic con- cepts of well log analysis. Remember that a borehole represents a dynamic system; that fluid used in the drilling of a well affects the rock surrounding the bore- hole and, therefore, log measurements.

How do you find the natural log of 10?

On a calculator it is the “log” button. It is how many times we need to use 10 in a multiplication, to get our desired number. Another base that is often used is e (Euler’s Number) which is about 2.71828. This is called a “natural logarithm”. Mathematicians use this one a lot. On a calculator it is the “ln” button.

What does log 10 mean on a calculator?

On a calculator it is the “log” button. It is how many times we need to use 10 in a multiplication, to get our desired number.