Changes

==Oil and gas zones==

==Oil and gas zones==

[[file:evaluating-source-rocks_fig6-7.png|thumb|{{figure number|1}}. Copyright: Tissot and Weite, 1984; courtesy Springer-Verlag.]]

[[file:evaluating-source-rocks_fig6-7.png|300px|thumb|{{figure number|1}}. Copyright: Tissot and Weite, 1984; courtesy Springer-Verlag.]]

Oil and gas zone boundaries can be established using vitrinite reflectance data. The boundaries are approximate and vary according to kerogen type. [[:file:evaluating-source-rocks_fig6-7.png|Figure 1]] shows the approximate boundaries for kerogen types I, II, and III. Time-temperature relationships and mixing of various sources of organic matter may alter these boundaries.

Oil and gas zone boundaries can be established using vitrinite reflectance data. The boundaries are approximate and vary according to kerogen type. [[:file:evaluating-source-rocks_fig6-7.png|Figure 1]] shows the approximate boundaries for kerogen types I, II, and III. Time-temperature relationships and mixing of various sources of organic matter may alter these boundaries.

[[file:evaluating-source-rocks_fig6-8.png|thumb|{{figure number|2}}See text for explanation.]]

[[file:evaluating-source-rocks_fig6-8.png|300px|thumb|{{figure number|2}}See text for explanation.]]

==Misleading data, cautions, and recommendations==

==Misleading data, cautions, and recommendations==