鄂尔多斯盆地北缘石炭系太原组泥页岩生烃能力分析

Carboniferous Taiyuan Formation Paralic Facies Organic-rich Argillutite Hydrocarbon Generation Capacity Analysis in Northern Ordos Basin

鄂尔多斯盆地是我国大型的油气盆地,在内蒙古境内已发现苏里格、大牛地等多个大型天然气田,石炭—二叠系是主要的生烃层系。前人对煤层的生烃能力研究较多,认为煤成气对气藏贡献大。为弄清石炭系太原组泥页岩的生烃能力,通过野外调查、取样分析测试、老井资料复查等方法,对泥页岩的赋存分布、有机质类型、有机碳含量、有机质成熟度等进行了分析研究,认为太原组泥页岩具有较强的生烃能力,是本区天然气的主要烃源岩,也是页岩气的主要成藏层位,太原组泥页岩是我国北方寻找页岩气的有利层位。

The Ordos Basin is a large-sized oil and gas basin in China,multiple large natural gas fields such as Surig and Daniudi have been found in the basin,while the Permo-Carboniferous is the hydrocarbon generation measures.Most previous studies put attention on coal seam hydrocarbon generation capacity;considered that the coal gas has contributed to the gas reservoir a lot.To find out hydrocarbon generation capacity of the Carboniferous Taiyuan Formation paralic facies argillutite,through field investigation,sampling analytic tests,old well information review carried out analytic study on argillutite hosting and distribution,organic matter type,organic carbon content and organic matter maturity etc.The study has shown that the argillutite has strong hydrocarbon generation capacity,thus the main source rock of natural gas in the area,also the main reservoiring horizon of shale gas.Thus the Taiyuan Formation paralic facies argillutite is the favorable horizon to prospect shale gas in North China.