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鄂尔多斯盆地东部马二段发育典型的碳酸盐台地相岩石类型,本文以盆地东部全取心井镇钾1井作为基干井。镇钾1井位于陕北凹陷内部,马二段地层发育完整,其岩性主要以灰黑色生物碎屑灰岩和灰色白云岩为主。通过对镇钾1井约81m的岩心的矿物成分、组构和生物化石的观察及显微镜下分析,共划分出7种微相类型。根据微相类型及组合关系,划分为3个相带,即开阔台地相、局限台地相和蒸发台地相。沉积相的变化特征表明研究区在马二段沉积时期经历了3次海侵,其中马二段沉积早期海侵达到最大值。
Typical carbonate platform facies rock types are developed in the second member of the Ordos Basin in the eastern part of the Ordos Basin. Well K1 is located in the interior of Shaanbei depression. The formation of Ma2 Member is well developed. Its lithology mainly consists of gray-black bioclastic limestone and gray-colored dolomite. Through the observation and microscopic analysis of the mineral composition, structure and biological fossil of the core about 81m in Zhenkai-1 well, seven types of microfacies are divided. According to the types and combination of microfacies, it is divided into three facies belts, ie, open platform facies, limited platform facies and evapotranspiration facies. The characteristics of the sedimentary facies show that the study area underwent three transgressions during the deposition of the second member of the Ma’ansi Formation, in which the transgression of the second member of the Ma’er Member reached its maximum during the early deposition.