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    Elastic Wave Velocities in Heterogeneous and Porous Media

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    Shyh-Zung Lo
    This document defines well logging and explains its purpose. Well logging records information about rock formations and events during well drilling. This log tells whether a well will provide usable water or oil. It notes the depth of formations and their types. Well logs help determine if formations contain desirable resources like water or oil. They also indicate if additional treatment is needed before commercial use. Different types of logs examine properties like resistivity, sound transmission, and radioactivity to characterize formations. Well logs visually display test results as lines of data or combined on a comprehensive log.

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    Elastic Wave Velocities in Heterogeneous and Porous Media

    Uploaded by

    Shyh-Zung Lo
    42 views2 pages
    This document defines well logging and explains its purpose. Well logging records information about rock formations and events during well drilling. This log tells whether a well will provide usable water or oil. It notes the depth of formations and their types. Well logs help determine if formations contain desirable resources like water or oil. They also indicate if additional treatment is needed before commercial use. Different types of logs examine properties like resistivity, sound transmission, and radioactivity to characterize formations. Well logs visually display test results as lines of data or combined on a comprehensive log.

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    well log introduction

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    This document defines well logging and explains its purpose. Well logging records information about rock formations and events during well drilling. This log tells whether a well will provide usable water or oil. It notes the depth of formations and their types. Well logs help determine if formations contain desirable resources like water or oil. They also indicate if additional treatment is needed before commercial use. Different types of logs examine properties like resistivity, sound transmission, and radioactivity to characterize formations. Well logs visually display test results as lines of data or combined on a comprehensive log.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    42 views2 pages

    Elastic Wave Velocities in Heterogeneous and Porous Media

    Uploaded by

    Shyh-Zung Lo
    This document defines well logging and explains its purpose. Well logging records information about rock formations and events during well drilling. This log tells whether a well will provide usable water or oil. It notes the depth of formations and their types. Well logs help determine if formations contain desirable resources like water or oil. They also indicate if additional treatment is needed before commercial use. Different types of logs examine properties like resistivity, sound transmission, and radioactivity to characterize formations. Well logs visually display test results as lines of data or combined on a comprehensive log.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 2

    What is Well Logging?

    - Definition & Purpose


    Chapter 26 /  Lesson 1 

    To determine whether a well will provide usable water, it needs to have a well log. This well log tells you whether your well has what you need
    and whether you need to cement it or not. Learn more in this lesson.

    Definition of Well Logging


    Did you know that in a lot of areas people get their water from wells? Instead of getting water from a water company, they get water from a well
    that may be a private well or a public shared well. And in some remote areas, people actually have to walk to the local well to retrieve water.

    Well, before these wells became successful and useful, they had to be drilled. During this drilling process, do you know what the workers did to
    determine whether the well would be successful? They recorded a well log. A well log is a record of the formations and any events that are
    encountered in the drilling process. It basically tells you what you pass through as you are drilling deeper and deeper. It is also referred to
    as borehole logging.

    Purpose of Well Logging


    Well logging is actually used not just for water wells, but also for oil wells. Researchers also use well logging as a means to perform geothermal,
    geotechnical, and environmental studies. Well logs tell researchers how deep certain formations are and what types of formations are present
    underground.

    Well logs are used while drilling to determine a well's suitability and to record any events, such as any problems that occur, along with what kind
    of formations are being drilled through. This information is then used to determine if the formations are desirable ones or undesirable ones
    depending on the type of well. Well logs also tell workers whether a water well has enough water or whether an oil well has enough oil. They also
    tell workers whether the oil or water from a well needs additional treatment before it can be used commercially.

    Types of Well Logs


    With well logs serving so many purposes, there are various types of well logs that suit each purpose.

    Here is a list of just some of the types of well logs that are currently being used.

    Electrical resistivity well logs tell you how hard it is for an electric current to pass through a formation. This is also an indication of
    whether the water in the potential well is fresh or salty. (Salt water conducts more electricity making it easier for the electric current to pass
    through.) 

    Acoustic well logs tell you how easy it is for sound waves to travel through the formation. This is useful to see if water is present in the
    formation. 

    Gamma ray or radioactivity well logs let you know how much shale is present in the formation. 

    Induction well logs take the place of electrical resistivity logs when working with wells containing oil or air. 

    Spontaneous potential (SP) well logs tell you how porous or permeable the formation is.

    What a Well Log Looks Like


    So, what do well logs look like?

    You can have a well log with just one line of data or you can combine your data into a comprehensive well log, such as this one.
    An example of a comprehensive well log showing several tests for the same well

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