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Information gathered by the mudlogging crew is first recorded on a data sheet (Figure 1) and then plotted onto a mudlog form (Figure 2). Each mudlogger is responsible for plotting the data acquired during his or her tour. In this way, the mudlog becomes an accurate and up-to-date record of nearly all activity related to the drilling of the well.

Information gathered by the mudlogging crew is first recorded on a data sheet ([[:file:mudlogging-the-mudlog_fig1.png|Figure 1]]) and then plotted onto a mudlog form ([[:file:mudlogging-the-mudlog_fig2.png|Figure 2]]). Each mudlogger is responsible for plotting the data acquired during his or her tour. In this way, the mudlog becomes an accurate and up-to-date record of nearly all activity related to the drilling of the well.

[[file:mudlogging-the-mudlog_fig1.png|thumb|{{figure number|1}}Example of a mudlogging data sheet.]]

It is very important that a mudlog be recorded on a standard format using standardized plotting and reporting procedures. This is necessary to allow valid and convenient comparison of log data from well to well and to prevent confusion or misunderstanding over the meaning of a log trace or annotation.

[[file:mudlogging-the-mudlog_fig2.png|thumb|{{figure number|2}}Example of a standard mudlogging form. Note that although efforts are continually being made to standardize mudlog formats, present and previous mudlogs may differ in outline from this example.]]

==Layout of A mudlog==

It is very important that a mudlog be recorded on a standard format using standardized plotting and reporting procedures. This is necessary to allow valid and convenient comparison of log data from well to well and to prevent confusion or misunderstanding over the meaning of a log trace or annotation.

[[file:mudlogging-the-mudlog_fig1.png|left|thumb|{{figure number|1}}Example of a mudlogging data sheet.]]

==Layout of A mudlog==

[[file:mudlogging-the-mudlog_fig2.png|thumb|{{figure number|2}}Example of a standard mudlogging form. Note that although efforts are continually being made to standardize mudlog formats, present and previous mudlogs may differ in outline from this example.]]

Figure 2 is an example of the layout and information content of a standard mud log. The general usage of the tracks (columns) on a mudlog are outlined here.

[[:file:mudlogging-the-mudlog_fig2.png|Figure 2]] is an example of the layout and information content of a standard mud log. The general usage of the tracks (columns) on a mudlog are outlined here.

===Log headings===

===Log headings===

Some mudlog formats have an interpreted lithology column adjacent to the percent lithology. This interpreted lithology log attempts to take into account factors that might affect cuttings recovery, such as sloughing and trips.

Some mudlog formats have an interpreted lithology column adjacent to the percent lithology. This interpreted lithology log attempts to take into account factors that might affect cuttings recovery, such as sloughing and trips.

Additional reservoir information can also be recorded in track 2. In the example log shown in Figure 2, a separate column is included for qualitative porosity estimation.

Additional reservoir information can also be recorded in track 2. In the example log shown in [[:file:mudlogging-the-mudlog_fig2.png|Figure 2]], a separate column is included for qualitative porosity estimation.

===Track 3: depth annotation===

===Track 3: depth annotation===