In the upper Jurassic to Tertiary, there is the alkali diagenetic ambient, in which the inter-pore fluid is inherited from the buried syngenetic water, i.e., alkali saline.

• 上侏罗纪至第三系为碱性成岩环境，隙间流体继承了封存同生水特征，为碱性盐卤水。