摘要
五十年代后期,地质部和石油部先后在鄂尔多斯盆地北部——伊克昭盟地区展开了大规模的石油普查、详查和钻探工作。当时,钻探主要集中在乌兰格尔一隅,未获工业油气流。
Abstract
This paper briefly clarifies the basic geological theories of vitrite refle-ctivity（R max）and gives a preliminary discussion with Rmax on the con-ditions of oil and gas origin in Taiyuan formation of Carboniferous Sys-tem in northern Ordos Basin.It is suggested that Rmax ranging from 0.5to 1.3% is confirmed as the main stage of oil formation;<0.5%,as im-mature stage;>1.3%,as overmature stage,that is,gas formation stage.The result shows that the organic matter of Otoc County and its south ernregion have reached overmature stage;in its northern region,the Taiyuan formation is just at the main mature stage,but the conditions of conser-vation on both sides of east and west are rather defective,the availableregion is only restricted in a narrow zone in the southern part of the west.Finally,in combination with the geotectonic evolution,sedimentary cha-racteristics and lithofacies of the basin,the districts of oil and gas pot-ential of Taiyuan formation has been divided.
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