Changes

[[:file:Mth16Ch7Figure7-1.jpg|Figure 1]] is a flowchart for one such scanning technique. Note that it has two paths, one for [[Lithofacies and environmental analysis of clastic depositional systems|clastics]] and one for [[carbonate]]s. In the clastic case, the [[Basic_open_hole_tools#Resistivity|resistivity log]] is the primary reconnaissance measurement because clastics tend to consist of reservoirs surrounded by [[shale]]s of slowly varying resistivity. The changes in resistivity due to changes in fluid content of the reservoirs tend to stand out against this relatively constant background. On the carbonate path, on the other hand, formation resistivities tend to vary widely with changing rock types, and commonly there are few shales against which to measure changes. In this case, the [[Basic_open_hole_tools#Porosity|porosity log]] is the primary reconnaissance measurement. By first finding the porous zones, those with the capacity to hold fluids (of any type) can be identified.

[[:file:Mth16Ch7Figure7-1.jpg|Figure 1]] is a flowchart for one such scanning technique. Note that it has two paths, one for [[Lithofacies and environmental analysis of clastic depositional systems|clastics]] and one for [[carbonate]]s. In the clastic case, the [[Basic_open_hole_tools#Resistivity|resistivity log]] is the primary reconnaissance measurement because clastics tend to consist of reservoirs surrounded by [[shale]]s of slowly varying resistivity. The changes in resistivity due to changes in fluid content of the reservoirs tend to stand out against this relatively constant background. On the carbonate path, on the other hand, formation resistivities tend to vary widely with changing rock types, and commonly there are few shales against which to measure changes. In this case, the [[Basic_open_hole_tools#Porosity|porosity log]] is the primary reconnaissance measurement. By first finding the porous zones, those with the capacity to hold fluids (of any type) can be identified.

[[file:Mth16Ch7Figure7-1.jpg|thumb|left|300px|{{figure number|1}}Flowchart for scanning logs to identify zones of interest (both pay and wet). ¹ Zones that appear to be shales might be radioactive productive zones. ² Shaly zones might produce oil or gas even if they have low resistivity.<ref name=AsquithandKrygowski_2006>Asquith, G., and D. Krygowski, 2006, Basic Well Log Analysis, 2nd Edition: AAPG Methods in Exploration 16, 244 p.</ref>]]

[[file:Mth16Ch7Figure7-1.jpg|thumb|left|300px|{{figure number|1}}Flowchart for scanning logs to identify zones of interest (both pay and wet). ¹Zones that appear to be shales might be radioactive productive zones. ²Shaly zones might produce oil or gas even if they have low resistivity.<ref name=AsquithandKrygowski_2006>Asquith, G., and D. Krygowski, 2006, Basic Well Log Analysis, 2nd Edition: [http://store.aapg.org/detail.aspx?id=707 AAPG Methods in Exploration 16], 244 p.</ref>]]

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