Changes

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.

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.

==Layout of A mudlog==

==Layout of a mudlog==

<gallery mode=packed heights=300px widths=300px>

<gallery mode=packed heights=300px widths=300px>

mudlogging-the-mudlog_fig1.png|{{figure number|1}}Example of a mudlogging data sheet.

mudlogging-the-mudlog_fig1.png|{{figure number|1}}Example of a mudlogging data sheet.

* ''Total combustible hydrocarbons'' from gas trap, mud, cuttings blender tests, and nonformational borehole gas events such as trip gas, carbide lag checks, and connection gas are recorded.

* ''Total combustible hydrocarbons'' from gas trap, mud, cuttings blender tests, and nonformational borehole gas events such as trip gas, carbide lag checks, and connection gas are recorded.

* ''Hydrocarbon chromatograph'' with gaseous alkanes (methane, ethane, propane, butanes, and pentanes) are plotted as individual tracks. Chromatograph calibration checks are also included, providing they do not obscure well data.

* ''Hydrocarbon chromatograph'' with gaseous alkanes (methane, ethane, propane, butanes, and pentanes) are plotted as individual tracks. Chromatograph calibration checks are also included, providing they do not obscure well data.

* ''Oil evaluation'' includes subjective and qualitative evaluation of oil staining and solvent-cut oil. (Many mudloggers include these data in the lithology track.) This evaluation can also include qualitative analysis of oil fluorimetry, refractometry, and geochemistry.

* ''Oil evaluation'' includes subjective and qualitative evaluation of oil staining and solvent-cut oil. (Many mudloggers include these data in the lithology track.) This evaluation can also include qualitative analysis of oil fluorimetry, refractometry, and [[geochemistry]].

===Track 6: geological and lithological evaluation===

===Track 6: geological and lithological evaluation===

[[Category:Wellsite methods]]

[[Category:Wellsite methods]]

[[Category:Petrophysics and well logs]]

[[Category:Petrophysics and well logs]]