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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.]]
==Misleading data, cautions, and recommendations==
==Misleading data, cautions, and recommendations==
* Reworking of vitrinite in the geologic section
* Reworking of vitrinite in the geologic section
* Drilling mud additives
* Drilling mud additives
Therefore, explorationists should always request and examine the raw data as well as the histograms and mean data.
Therefore, explorationists should always request and examine the raw data as well as the histograms and mean data.