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--- thermal_maturity [10/05/2023 16:32] – mike_gss
+++ thermal_maturity [11/05/2023 09:25] (current) – mike_gss
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 **Source Rocks and Organic Maturity**
-Petroleum Systems Analysis is the phase in basin screening and exploration where it is determined if all the necessary elements are in place to generate and trap hydrocarbons. These include elements such as the presence of a source-rock, a trap and a seal but also include quantitative assessments including how much hydrocarbons could be generated from the source rock under different degrees of maturity and whether there are suitable migration routes to allow the hydrocarbons to get from the source rocks and into the trap. Does the trap contain rock units that are of suitable porosity and permeability to store (and subsequently allow to be released when drilled) commercial quantities of hydrocarbons and is there a coherent, non-porous and non-permeable seal which is intact (i.e. unfractured)?
+//Petroleum Systems Analysis// is the phase in basin screening and exploration where it is determined if all the necessary elements are in place to generate and trap hydrocarbons. These include elements such as the presence of a source-rock, a reservoir, a trap and a seal but also include quantitative assessments including how much hydrocarbons could be generated from the source rock under different degrees of maturity and whether there are suitable migration routes to allow the hydrocarbons to get from the source rocks and into the reservoir/trap. Does the reservoir comprise rock units that are of suitable porosity and permeability to store commercial quantities of hydrocarbons (and subsequently allow to be released when drilled) and is there a coherent, non-porous and non-permeable seal which is intact (i.e. unfractured)?
 Microfossils cannot directly inform us of the latter features of a Petroleum System but they can give us insights - some quantitative - into the source-rocks and hydrocarbon-generative aspects of a Petroleum System.
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 //Inputs into Petroleum Systems Analysis.//
-Most source-rocks are marine in origin although coals and certain lacustrine sediments can also be very organic rich. Some of the most prolific source-rocks (grouped by age) are listed below:
+Most source-rocks are marine in origin although coals and certain lacustrine sediments can also be very organic rich. Some of the world's most prolific source-rocks (grouped by age) are listed below:
   * **Silurian** (9%); Qusaiba and correlatives, Middle East (also North Africa) - accounts for all Palaeozoic-reservoired oil and gas in Middle East (?1000tcf of gas in North Dome/South Pars alone).
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   * **Oligocene-Holocene** (13%); Maykop, Eastern Paratethys - accounts for much of oil and gas in South Caspian (Miocene Diatom Suite also a contributor)
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