东胜煤田锡尼布拉格勘查区侏罗-白垩系  

Division and Correlation of Jurassic-Cretaceous Strata in Xini Bulak Exploration Area,Dongsheng Coalfield

作　　者：石彦强 

机构地区：[1]中煤地质工程总公司北京大地特勘分公司,北京100073

出　　处：《中国煤炭地质》2012年第12期11-18,共8页Coal Geology of China

基　　金：中央地质勘查基金项目(2009150003)

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。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 lithologie 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 （Jzya）, 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, hut bottom part Group I and top part Group VII are missing.

关 键 词：侏罗-白垩系 岩性特征 物性特征 划分与对比 锡尼布拉格勘查区 

分 类 号：P534.5[天文地球—古生物学与地层学]