岩性为杂色（灰白、灰绿、暗紫红等色）砂岩、泥岩为主，夹含砾砂岩、砾岩。厚79—956米。与其下伏第三系各组呈不整合接触。
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港西开发区含气层系为上第三系明化镇组和馆陶组。
Gas-bearing series of Gangxi Developing Area is Minghuazhen and Guantao Group of upper Tertiary.
储集层主要由馆陶组辫状河沉积砂体和明化镇组曲流河沉积砂体组成；
The reservoir is mainly composed of the braided channel sedimentary sand in Guantao formation and meandering river sedimentary sand in Minghuazhen formation .
南堡凹陷古近系及新近系火山岩主要分布于馆陶组、东营组、沙河街组。
The volcanic rocks of Neocene and Eogene in Nanpu depression is mainly distribute in Ng, Ed and Es formation.
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