陕西省渭北煤田石炭—二叠系层序地层与聚煤作用研究  

Permo-Carboniferous Sequence Stratigraphy and Coal Accumulation Studies in Weibei Coalfield,Shaanxi Province

作　　者：李明培[1] 李智学[2] 邵龙义[1] 任海香[2] 董大啸[1] 李静琴[1] 

机构地区：[1]中国矿业大学(北京),北京100083 [2]陕西省煤田地质局,陕西西安710054

出　　处：《中国煤炭地质》2011年第8期43-48,共6页Coal Geology of China

基　　金：国土资源大调查(1212010633901);国家科技重大专项(2011ZX05009-002)项目共同资助

摘　　要：利用钻孔岩心资料及层序地层学的观点,对陕西省渭北煤田石炭—二叠纪煤系地层进行了层序地层学的分析。以奥陶系顶部区域不整合面、太原组最大海泛面的K2灰岩"1分层"的顶面、山西组底部的"北岔沟砂岩"(K4)底面和下石盒子组底部"骆驼脖子砂岩"(K中)底面等界面为层序界限将研究区内含煤地层划分为3个三级层序SQ1、SQ2、SQ3。在层序格架内,对煤层的聚集规律进行研究,结果表明,渭北煤田主要可采煤层3号、10号、11号煤层主要形成于海侵体系域中晚期,4号、5号煤层形成于高位体系域的中晚期。Using borehole core data and sequence stratigraphic point of view,carried out Permo-Carboniferous coal measures strata sequence stratigraphic analysis in the Weibei coalfield,Shaanxi Province.Taking the Ordovician System top regional unconformity surface,the top surface of K2 limestone first slice maximum marine flooding surface in the Taiyuan Formation,the bottom surface of the Beichagou sandstone（K4） in the bottom part of the Shanxi Formation as well as the bottom surface of the Luotuobozi sandstone（Km） in the bottom part of the Xiashihezi Formation as sequence boundaries and subdivided coal-bearing strata in the study area into 3 third-order sequences SQ1,SQ2 and SQ3.Coal accumulation patterns have been studied within the sequence framework,the result demonstrated that the main mineable coal seams Nos.3,10 and 11 in Weibei coalfield were deposited in the middle late stage of transgression systems tract（TST）,while Nos.4 and 5 in the middle late stage of highstand systems tract（HST）.

关 键 词：石炭—二叠纪 层序地层 含煤性 聚煤作用 渭北煤田 

分 类 号：P539.2[天文地球—古生物学与地层学] P618.11[天文地球—地质学]