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→Track 2: cuttings lithology
Track 2 identifies and records the lithology of the cuttings material that arrives at the surface as drilling takes place (see chapter on [[Mudlogging: drill cuttings analysis]]). Information is commonly presented as lithological symbols, each representing 10% of the total sample volume. This is commonly referred to as a ''percentage log''.
Track 2 identifies and records the lithology of the cuttings material that arrives at the surface as drilling takes place (see chapter on [[Mudlogging: drill cuttings analysis]]). Information is commonly presented as lithological symbols, each representing 10% of the total sample volume. This is commonly referred to as a ''percentage log''.
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 [[trip]]s.
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.
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.