河南平顶山矿区含煤地层沉积环境及其对煤系气成藏的控制  

Sedimentary environment of coal-bearing strata and its control on accumulation of coal measure gas in Pingdingshan mining area,Henan Province

作　　者：李延河[1,2] 王保玉 刘顺喜[3,4] 倪小明[3] 王娟[3,4] 胡斌[3,4] LI Yanhe;WANG Baoyu;LIU Shunxi;NI Xiaoming;WANG Juan;HU Bin(Pingdingshan Tian'an Coal Industry Co.,Ltd.,Henan Pingdingshan 467000,China;China Pingmei Shenma Group Co.,Ltd.,Henan Pingdingshan 467000,China;Institute of Efficient Development and Utilization of Coal Gas Resources,Henan Polytechnic University,Henan Jiaozuo 454000,China;College of Resources and Environment,Henan Polytechnic University,Henan Jiaozuo 454000,China)

机构地区：[1]平顶山天安煤业股份有限公司,河南平顶山467000 [2]中国平煤神马集团有限责任公司,河南平顶山467000 [3]河南理工大学煤系气资源高效开发利用研究院,河南焦作454000 [4]河南理工大学资源环境学院,河南焦作454000

出　　处：《古地理学报》2024年第6期1420-1434,共15页Journal of Palaeogeography：Chinese Edition

基　　金：国家自然科学基金项目(编号:42372198);河南省高校创新团队(编号:21IRTSTHN007)联合资助。

摘　　要：近几年来,河南省平顶山矿区煤系气勘探开发取得了新突破,采动井、采空井和预抽井的单井日抽采量分别达到40500 m^(3)、20000 m^(3)和4500 m^(3)。为了查明煤系气生成与赋存的沉积背景,本次工作采用地层学与沉积学的研究方法,开展了精细的地层、沉积特征和沉积序列以及气测录井资料分析,从而揭示出本区主要含煤地层山西组和下石盒子组中煤系气(煤层气、页岩气和致密砂岩气)生成与赋存的沉积环境,也就是潮坪上的泥炭沼泽(泥炭坪)、三角洲分流间湾沼泽和分流河道沉积环境控制了煤系气的成藏。基于地层沉积特征在垂向上的变化规律,划分出9种不同沉积环境的沉积序列类型,并在综合分析的基础上,提出了平顶山矿区山西组—下石盒子组煤系气赋存的沉积环境模式。研究还表明,区内煤系气含量变化及区域分布特征不仅与滨岸潮坪沼泽、三角洲分流河道砂体和分流间湾沼泽的时空变化密切相关,而且还与储集层厚度变化相关。该成果可为今后平顶山地区煤系气勘探开发井的设计、部署与施工提供科学依据。同时,对华北地区相同含煤地层的煤系气开发也具有重要借鉴意义。In recent years,a new breakthrough has been made in the exploration and development of coal measures gas in the Pingdingshan mining area of Henan Province.The daily production per well in mining area,goal area and unmining area reached 40500 m^(3),20000 m^(3)and 4500 m^(3),respectively.To better understand the sedimentary background of coal measure gas generation and occurrence,this study applies stratigraphy and sedimentology research methods to conduct a detailed analysis of strata,sedimen-tary characteristics,and sedimentary sequences,along with gas logging data.This reveals the sedimentary environment controlling the generation and occurrence of coal measure gas(coalbed methane,shale gas,and tight sandstone gas)in the Shanxi Formation and Xiashihezi Formation.Specifically,the sedimentary environment of peat swamp(peat flat)on tidal flat,delta interdistributary bay swamp and distributary channel control the accumulation of coal measure gas.According to the vertical variation of stratigraphic and sedimentary characteristics,nine different sedimentary sequence types are classified,and the sedi-mentary environment model of coal measure gas occurrence in the Shanxi Formation and Xiashihezi Forma-tion in Pingdingshan area is proposed.The study also shows that the content change of coal measure gas and its regional distribution characteristics are not only closely related to the spatio-temporal variation of coastal tidal flat marsh,delta distributary channel sand body and interdistributary bay marsh,and are also related to the variation of reservoir thickness.The results can provide a scientific basis for the future de-sign,deployment and production of coal measure gas exploration and development wells in Pingdingshan area.Moreover,the findings offer important reference significance for the development of coal measures gas in the similar coal-bearing strata in North China.

关 键 词：煤系气开发 地质勘探 含煤地层 山西组 下石盒子组 平顶山矿区 

分 类 号：P618.13[天文地球—矿床学]