下古生界，约5.7-4.05亿年前。包括寒武系、奥陶系、志留系，分布在各大造山带和拗陷内。分两种沉积类型：塔里木一昆仑山地区寒武系、奥陶系为浅海一滨海相碳酸盐岩一碎屑岩建遣，志留系为碎屑岩建造；天山一准噶尔地区以中酸性火山岩和碎屑岩为主，博罗科努山为碳酸盐岩建造。
...缘下古生界地层分析 | 四川矿业网 关键词：下古生界；孔隙；储集能力；鄂尔多斯盆地西缘 [gap=3600]Key words: Lower Paleozoic Group; porosity; reservoir capacity; western margin of the Ordos basin ..
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下古生界海相烃源岩 lower palaeozoic marine hydrocarbon source rocks
However, the fold style in the deeper,lower Paleozoic cover strata in the western belt are mainly controlled by overlying pressures, and the developed fold style should be trough-like folds according to the numerical modeling results.
而其深部的下古生界地层主要受上覆压力控制,根据模拟推测应为隔槽式褶皱。
参考来源 - 川东“侏罗山式”褶皱的数值模拟及成因探讨·2,447,543篇论文数据，部分数据来源于NoteExpress
下古生界气藏很可能形成于喜山期，其扩散损失量较小；
The gas pool of Lower Paleozoic is probably formed in Himalayans period.
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.
灰岩、白云岩在华北主要产于下古生界，在华南主要产于泥盆系-三叠系。
Limestone and dolomite in North Chinamainly occur in the Lower Paleozoic and those in South China in the Devonian - Triassic.
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