内蒙古西部银根-额济纳旗盆地石炭系—二叠系暗色泥质岩有机质丰度变化特征和生烃潜力

银-额盆地石炭系—二叠系1100多个暗色泥质岩样品的有机质丰度、热解分析结果表明，依据TOC的评价标准，银-额（银根-额济纳旗）盆地石炭系—二叠系暗色泥岩和页岩达到烃源岩标准的样品占总样品数的50%以上，达到好烃源岩标准的样品占总样品数的15%以上。纵向上银-额盆地石炭系—二叠系从下部的上石炭统—下二叠统阿木山组/甘泉组、中—下二叠统埋汗哈达组、中二叠统阿其德组/菊石滩组到上二叠统哈尔苏海组，暗色泥质岩的有机质丰度具有从下到上总体降低的趋势；平面上同一层段中具有北部地区TOC高于南部地区、西部地区TOC高于东部地区的分布特征，这种分布特征与该区的沉积环境相吻合。研究区露头样品热解分析所获的生烃潜量和氢指数结果不能作为评价烃源岩的指标。

Abundance variation characteristics and hydrocarbon-generating potential of organic matter in Carboniferous-Permian dark argillaceous rock of Yingen-Ejin Banner basin,western Inner Mongolia

Based on statistical analysis of 1100 Carboniferous-Permian dark mud rock samples in Yingen-Ejin Banner basin, the results about organic matter abundance and source rock pyrolysis show that 50% of collected samples meet the standard of source rock, and superior source rocks occupy over 15%. Vertically, organic matter abundance of mud rock from Carboniferous to Permian (from upper Carboniferous to Amushan /Ganquan Formation in lower Permian , Maihanhada Formation in middle-lower Permian, Aqide/Jushitan Formation in middle Permian to Haersuhai Formation in upper Permian) reveals a trend of gradual decrease. TOC content of northern area is over the counterpart from southern area, and the content of TOC in western part is higher than that of the east, which is coincident with the sedimental environment. In addition, it is necessary to declare that the indicators derived from pyrolysis analysis on outcrop samples ,such as hydrocarbon-generating potential and hydrogen index，cannot be the efficient way to evaluate source rocks.