古地理学报2026，Vol.28Issue(2)：695-707,13.DOI:10.7605/gdlxb.2026.034
豫东地区石炭—二叠纪含煤岩系层序—古地理与聚煤规律
Characteristics of sequence-palaeogeography and coal-accumulating models of the Permo-Carboniferous coal-bearing series in eastern Henan Province
摘要
Abstract
The eastern Henan Province is located at the southern edge of the North China Basin and is currently one of the main areas for coalbed methane exploration in China.The Permo-Carboniferous is the main coal-forming period in this area,and the coal measures were deposited in the marine-terrestrial transitional environments,being characterized by a wide and stable distribution.On the basis of drilling date,outcrop sections and geophysical logging date,the sequence stratigraphic framework was established for the Permo-Carboniferous coal measures in this area.Based on the regional unconformity surface,the coal-bearing series in the study area are subdivided into three third-order sequences.Combined with formation,percentages of limestones,mudstone thickness,sandstone to mudstone thickness ratios,coal thickness contour map,restore the sequence of the palaeogeographical maps,the main palaeogeographical unit with delta plain,barrier island,tidal-lagoon,and carbonate shelf.The coals in sequence Ⅰ and sequence Ⅱ were mainly formed in the tidal-lagoon environment,while the coals in sequence Ⅲ were formed in the delta plain and tidal environment.Among them,the major coal seam(A-0,A-5)in sequence Ⅰ and the major coal seam(B-1)in sequence Ⅲ are well developed.The A-0 and A-5 coal seam were formed in a peat swamp developed from the offshore shelf settings,located near the initial flooding surface and the end of the HST in sequence Ⅰ where the slow rate of sea level rise and thus the slow rate of accommodation space growth was balancing with the slow rate of peat accumulation,A-0 coal seam developed well in Zhecheng area and A-5 coal seam developed well in Huaiyang area.The B-1 coal seam was formed in the peat swamp environment developed from of the fluvial-dominated shallow water delta plain,near the maximum flooding surface of sequence Ⅲ where the fast sea level rise and thus the fast growth rate of the accommodation growth was well matching the high rate of peat accumulation.The balance between the rates in peat accumulation and the rates in accommodation space creation is a key condition for coal accumulation in the sequence stratigraphic framework.The B-1 coal seam developed well in Zhecheng,Huaiyang and Taikang areas.关键词
层序地层格架/岩相古地理/聚煤模式/石炭—二叠纪/海陆过渡相/豫东地区Key words
sequence stratigraphic framework/lithofacies palaeogeography/coal-accumulating model/Permo-Carboniferous/marine and terrestrial transitional facies/easrern Henan Province分类
天文与地球科学引用本文复制引用
吴会永,许礼纪,朱绍军,张孟鸽,许军,史小卫,邵龙义..豫东地区石炭—二叠纪含煤岩系层序—古地理与聚煤规律[J].古地理学报,2026,28(2):695-707,13.基金项目
河南省地质研究院院管科研项目"豫东地区深部煤系气有利区优选方法研究及示范"(编号:2023-331-XM022-KT03)及"南华北盆地深部煤系气储层物性特征及立体压裂模拟研究"(编号:2024-352-XM025-KT05)资助.[Co-funded by the research projects of Henan Academy of Geology including"Research and Demonstration of Optimal Selection Methods for Beneficial Areas of Deep Coal-Measures-Gas in Eastern Henan Province"(No.2023-331-XM022-KT03)and"Research on Reservoir Properties and Stereoscopic Fracturing Simulation of Deep Coal-Meas-ures-Gas in the Southern North China Basin"(No.2024-352-XM025-KT05)] （编号:2023-331-XM022-KT03）
