Sedimentary environment of coal-bearing strata and its control on accumulation of coal measure gas in Pingdingshan mining area,Henan Province
LI Yanhe1,2, WANG Baoyu3,4, LIU Shunxi3,4, NI Xiaoming3, WANG Juan3,4, HU Bin3,4
1 Pingdingshan Tian'an Coal Industry Co.,Ltd.,Henan Pingdingshan 467000,China; 2 China Pingmei Shenma Group Co.,Ltd.,Henan Pingdingshan 467000,China; 3 Institute of Efficient Development and Utilization of Coal Gas Resources,Henan Polytechnic University,Henan Jiaozuo 454000,China; 4 College of Resources and Environment,Henan Polytechnic University,Henan Jiaozuo 454000,China
Abstract：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 40 500 m3,20 000 m3 and 4 500 m3,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,sedimentary 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 sedimentary environment model of coal measure gas occurrence in the Shanxi Formation and Xiashihezi Formation 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 design,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.
LI Yanhe,WANG Baoyu,LIU Shunxi et al. Sedimentary environment of coal-bearing strata and its control on accumulation of coal measure gas in Pingdingshan mining area,Henan Province[J]. JOPC, 2024, 26(6): 1420-1434.
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