西山煤田石炭—二叠纪岩相古地理演化特征分析  

Analysison Paleographical Evolution of Carboniferous-Permian Lithofacies in Xishan Coalfield,Shanxi Province

作　　者：朱伟鹏 宋公社 陈强[4] 周安朝[4,5] ZHU Weipeng;SONG Gongshe;CHEN Qiang;ZHOU Anchao(School of Earth and Space Sciences,Peking University,Beijing 100871,China;Key Laboratory of Orogenic Belts and Crustal Evolution,MOE,Peking University,Beijing 100871,China;Shaanxi Mineral Resources and Geological Survey,Xi’an 710068,Shaanxi,China;College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;Coal and Coal Gas Geology Key Laboratory of Shanxi Province,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]北京大学地球与空间科学学院,北京100871 [2]北京大学造山带与地壳演化教育部重点实验室,北京100871 [3]陕西省矿产地质调查中心,陕西西安710068 [4]太原理工大学矿业工程学院,山西太原030024 [5]太原理工大学煤与煤系气地质山西省重点实验室,山西太原030024

出　　处：《西北地质》2020年第4期20-33,共14页Northwestern Geology

基　　金：国家重点研发计划项目“煤炭清洁高效利用和新型节能技术”(2017YFB0603101)。

摘　　要：通过解译钻孔岩心数据对西山煤田石炭一二叠纪含煤地层沉积环境进行分析,识别出3种主要的沉积体系及若干沉积亚环境和微环境类型。晚石炭世本溪组沉积期主要发育碳酸盐台地-潟湖-潮坪沉积体系;晚石炭世一早二叠世太原组沉积期主要发育碳酸盐台地-障壁岛-潟湖-潮坪沉积体系。早二叠世山西组沉积期开始,西山煤田地区发生区域性海退,开始发育以浅水三角洲为典型特征的沉积体系。区域沉积环境由早期的陆表海到中期的海陆过渡,晚期演化为河控三角洲。聚煤作用发生于太原组和山西组沉积期,潟湖、潮坪和三角洲平原是最为有利的聚煤场所。太原组煤层产于潟湖-潮坪,砂岩厚的区域则煤层厚;而山西组煤层产于三角洲平原,泥岩厚的区域则煤层厚。The sedimentary environment of the Carboniferous-Permian coal-bearing strata in Xi shan coalfield is analyzed by means of drill cores logging data.Three main types of sedimentary systems and several types of sedimentary sub-environments and micro-environment are identified.The sedimentary system of the carbonate platform-lagoon-tidal flat were mainly developed in Benxi Formation in Late Carboniferous,while the sedimentary system of the carbonate platform-barrier island-lagoon-tidal flat in Taiyuan Formation mainly in Late Carboniferous-Early Permian.In the sedimentary period of Shanxi Formation in Early Permian,a regional regression occurred in Xishan coalfield,and a sedimentary system characterized by shallow water delta began to develop.The regional sedimentary environment changed from the epicontinental sea in the early stage,the sea-land interaction in the middle stage to the river-controlled delta in the late stage.Coal accumulation occurred in the deposition period of both Taiyuan Formation and Shanxi Formation.Lagoon,tidal flat and delta plain were the most favorable places of coal accumulation.Coal seams of Taiyuan Formation were produced in the lagoon-tidal flat,the thicker the sandstone,the thicker the coal seams,while coal seams of Shanxi Formation were produced in the delta plain,the thicker the mudstone,the thicker the coal seams.

关 键 词：西山煤田 石炭—二叠纪 岩相古地理演化 

分 类 号：P618.11[天文地球—矿床学]