沁水盆地煤层气富集影响因素及富集区类型划分
Influencing Factors and Classsification of Coalbed Methane Enrichment in Qinshui Basin
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摘要: 为了对沁水盆地的煤层气富集特征有更清楚的认识，在总结盆地研究成果基础上，针对盆地15#煤层，分析影响煤层气富集的因素。认为影响煤层气富集的因素中煤层埋藏史、煤岩组成、水动力条件及顶板性质是最主要的因素：埋深大、高镜质组含量、弱水动力条件、致密岩层封盖等有利于煤层气的富集。将煤层气富集区分为8种类型，其中向斜带泥岩、灰岩封盖区有利于煤层气保存，断裂带区、单斜带砂岩封盖区最不利于煤层气保存;背斜带灰岩封盖区及断裂带区有利于煤层气开发，是潜在煤层气高产区。Abstract: In order to have knowledge about the characteristics of coalbed methane in Qinshui basin clearly, based on the summary of the results of the basin research, this paper analyzes the factors influencing the enrichment of coalbed methane in No.15 coal seam of the basin. The main factors include the burial history, the formation of coal and rock, the hydrodynamic condition and the roof property. Buried depth, high vitrinite content, weak hydrodynamic conditions and compact rock capping are favorable to coalbed methane enrichment. The distribution of coalbed gas enrichment is divided into 8 types in this paper, the syncline area where is covered by mudstone or limestone is in favor of CBM preservation, the fault area and monocline area where are covered by sandstone go against CBM preservation. The anticline area where is covered by limestone and faut area are in favor of develpoment of CBM, are potential favorable mining area.
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