马家沟组原称“马家沟石灰岩”，属中奥陶世早期，最初命名地点在中国河北开平盆地马家沟，故名。分布于华北及东北南部，在河北，广泛分布于尚义——平泉以南的山区。
下古生界储层主要以马家沟组的泥晶白云岩和粉晶白云岩为主。
The Lower Paleozoic reservoir is Majiagou formation's putty crystal dolomite and powder crystal dolomite primarily.
鄂尔多斯盆地中部的长庆气田奥陶系马家沟组主要产气层均为白云岩。
Main gas producing strata in Changqing gas field, middle part of Ordos basin are dolomite in lithology.
储集层类型为下古生界奥陶系古风化壳型，其主力含气层为马家沟组第五段。
The reservoir type is Ordovician weathering crust in the Lower Paleozoic, and the main gas layer is in the fifth member of Majiagou Formation.
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