【摘要】 锡尼布拉格普查区位于东胜煤田西北部,由于地处鄂尔多斯北缘,区内侏罗-白垩系发育与盆地内部稍有差异。通过对地表露头追踪、岩性特征、测井曲线和地震时间剖面详细的研究,划分了岩石地层单位,根据本次及以往采集的植物化石确定了生物地层,并与鄂尔多斯盆地内的标准剖面进行了对比,地层自下而上发育有侏罗系中统延安组(J2ya)、直罗组(J2z)、安定组(J2a),白垩系下统志丹群宜君组(K1y)、洛河组(K1l)、环河组(K1h)、罗汉洞组(K1lh),下伏地层层为三叠系上统延长组,上覆地层为第四系上更新统,其中含煤地层延安组呈现"下缺上剥",含2-6煤组,缺失底部的1煤组和顶部的7煤组。更多还原

【Abstract】 The Xini Burak prospecting area is situated in the northwestern Dongsheng coalfield,north margin of the Ordos Basin,thus the development of the Jurassic-Cretaceous strata there has slight differences with strata in the basin interior.Through surface tracing of outcrops and detailed study of lithologic features,logging traces and seismic time sections,have divided the rock-stratigraphic units;based on plant fossils collected in this study and previously determined the biostratigraphic units;then correlated with the standard section of the basin interior.From bottom to top,strata units have middle Jurassic Yanan(J2ya),Zhiluo(J2z),Anding(J2a) formations,and lower Cretaceous Zhidan Group Yijun(K1y),Luohe(K1l),Huanhe(K1h),Luohandong(K1lh) formations;underlying is upper Triassic Yanchang Formation and overlying is Quaternary upper Pleistocene Series.In which,the Yanan Formation presents a geological phenomenon of "hiatus bottom and denuded top",contains 2~6 coal groups,but bottom part Group I and top part Group VII are missing.更多还原