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All types of rock (igneous, sedimentary, metamorphic) can act as reservoir rocks if it can accommodate and drain hydrocarbons. Reservoir rocks around the world is dominated by sedimentary rocks because generally it has primary porosity. [[Igneous]] and metamorphic rocks can be reservoir if there are in fracturing state (secondary porosity).

All types of rock (igneous, sedimentary, metamorphic) can act as reservoir rocks if it can accommodate and drain hydrocarbons. Reservoir rocks around the world is dominated by sedimentary rocks because generally it has primary porosity. [[Igneous]] and metamorphic rocks can be reservoir if there are in fracturing state (secondary porosity).

[[File:Klasifikasi reservoir.jpg|650px|center|thumbnail|{{figure number|2|}}Scheme of classification of reservoir rocks. (Adapted from Nichols, 2009, from lecture handout by Alamsyah <ref name=Alamsyah2015 >Alamsyah, M.N., 2015, Konsep Petroleum System (Handout Kuliah): Universitas Brawijaya</ref> )]]

[[File:Klasifikasi reservoir.jpg|650px|center|thumbnail|{{figure number|2|}}Scheme of classification of reservoir rocks. (Adapted from Nichols,<ref>Nichols, G., 2009, Sedimentology and Stratigraphy. Blackwell Science Ltd., London, 335 p.</ref> from lecture handout by Alamsyah<ref name=Alamsyah2015 >Alamsyah, M.N., 2015, Konsep Petroleum System (Handout Kuliah): Universitas Brawijaya</ref> )]]

===Siliciclastic Reservoir===

===Siliciclastic Reservoir===