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Connate fluids
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<p>In <a href="/facts/Geology/WGvVRIYF">geology</a> and <a href="/facts/Sedimentology/X6BES3hG">sedimentology</a>, connate fluids are liquids that were trapped in the pores of <a href="/facts/Sedimentary_rock/HQDCjrco">sedimentary rocks</a> as they were deposited. These liquids are largely composed of <a href="/facts/Water/0lkXnJPK">water</a>, but also contain many <a href="/facts/Mineral/LkUFbNmv">mineral</a> components as <a href="/facts/Ion/wrbwhF3z">ions</a> in <a href="/facts/Solution_(chemistry)/MGchhMQV">solution</a>. </p><p>As rocks are buried, they undergo <a href="/facts/Lithification/XoVlvd5J">lithification</a> and the connate fluids are usually expelled. If the escape route for these fluids is blocked, the pore fluid <a href="/facts/Pressure/eyc37GRG">pressure</a> can build up, leading to <a href="/facts/Overpressure_(geology)/YaQIL4oX">overpressure</a>. </p>