Changes

==Shale response example==

==Shale response example==

[[file:evaluating-source-rocks_fig6-2.png|thumb|{{figure number|6-2}}.]]

[[file:evaluating-source-rocks_fig6-2.png|thumb|{{figure number|1}}.]]

 

In [[:file:evaluating-source-rocks_fig6-2.png|Figure 1]], the composite log of Kimmeridge shale, North Sea is a typical log response to a high concentration of organic matter in a shale section. The underlying Heather Formation is very silty. The source rock interval is indicated by dots with dashes through them. Note the high sonic and gamma ray readings and the low density readings. The resistivity log reads only slightly higher than the overlying shale section.

==Limestone response example==

==Limestone response example==

[[file:evaluating-source-rocks_fig6-3.png|thumb|{{figure number|6-3}}.]]

[[file:evaluating-source-rocks_fig6-3.png|thumb|{{figure number|2}}.]]

 

The composite log in [[:file:evaluating-source-rocks_fig6-3.png|Figure 2]] of the Upper Jurassic Hanifa limestone in the Middle East displays a typical response of organic matter in a limestone section. No shale is present in this interval. Note the high gamma ray and resistivity readings. Core analysis of this well indicates the source rock (indicated by dots with dashes through them) is mature and generating oil.

==Limitations==

==Limitations==