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鄂尔多斯盆地东南部页岩气资源潜力巨大,而山西组烃源岩是其页岩气的主要目的层系。本文应用三参数法评价了山西组烃源岩的勘探潜力,结果表明:山西组泥页岩具备生气潜力的有机碳下限值为1.0%;山西组伊利石含量和泥页岩吸附气量关系最为密切,高岭石最差,伊利石/高岭石的值具有明显的两段性,其分界限为0.25,大于此值的泥页岩具有较好吸附性能;山西组泥页岩的杨氏模量/脆性指数的值具有明显分界限0.14,利用杨氏模量/脆性指数=0.14作为表征可压裂性的分界。综合上述三个参数可为页岩气有利层位的选取提供依据。
The potential of shale gas resources in the southeast of Ordos Basin is huge, while the source rocks of Shanxi Formation are the main strata of shale gas. This paper evaluates the exploration potential of source rocks in Shanxi Formation by the three-parameter method. The results show that the lower limit of organic carbon with shale gas potential of shale formation in Shanxi Formation is 1.0%, and the relationship between illite content and sorption amount of shale in Shanxi Formation is the most Closely, the kaolinite is the worst, the value of illite / kaolinite is obviously two-stage with the limit of demarcation of 0.25, and the shale larger than this value has better adsorption performance. The shale of Shanxi Formation shale The value of the modulus / brittleness index has a distinct demarcation limit of 0.14, using the Young’s modulus / brittleness index = 0.14 as the demarcation characterizing the fracability. Combining the above three parameters can provide the basis for selecting the favorable horizon of shale gas.