摘要
延川南区块是我国目前开发层位最深的煤层气田,为了进一步查明区块水文地质特征对煤层气富集规律的影响,提高煤层气开发的效率,通过对区块水化学类型、水动力强度和水动力分区的综合分析,查明了区块水文地质特征,揭示了水化学、水动力等条件对煤层气富集的控制作用。研究结果表明区块存在两个截然不同的水化学、水动力系统,东部煤层水以NaHCO_3型为主,矿化度<10g/L;西部煤层水以CaCl_2型为主,局部为NaHCO_3型,矿化度>10g/L。综合煤层水的矿化度、水型、折算水压头对区块进行了水动力分区,分区结果表明滞留区(万宝山构造带)有利于煤层气保存,煤层气含量最高;径流区(万宝山构造带东北部)煤层气大量逸散,含气量最低;弱径流区介于二者之间。该研究对区块煤层气的后续开发有重要意义。
The Yanchuannan block is the deepest coalbed methane (CBM)field developed in China at present.In order to further ascertain the influence of the hydrogeological characteristics of the block on the law of coalbed methane enrichment and improve the efficiency of CBM development,this paper analyzes comprehensively the hydrochemical types,hydrodynamic strength and hydrodynamic zoning in Yanchuannan block.The hydrogeological characteristics of the block are identified,and the controlling effects are revealed for hydrochemical and hydrodynamic conditions on coalbed methane enrichment.The results show that there are two distinct hydrochemistry and hydrodynamic systems in the block.The eastern coal seam water is mainly NaHCO3 type,with the mineralization degree <10g/L.The western coal seam water is mainly CaCl2 type,locally NaHCO3 type,with the mineralization degree>10g/L.According to the mineralization degree,water type and reduced water pressure head of coal seam water,the hydrodynamic zoning is carried out.The partition results show that the retention area (Wanbaoshan tectonic belt)is conducive to the preservation of coalbed methane,and the gas content of coal seam is the highest.The coalbed methane in the runoff area (the northeastern part of the Wanbaoshan tectonic belt)is scattered and the gas content is the lowest.The weak runoff area is between them.This study should be useful to the subsequent development of the coalbed methane in the block.
作者
原俊红
付玉通
蔡念
Yuan Junhong;Fu Yutong;Cai Nian(Inner Mongolia University Highway Engineering Test Center,Hohhot 010070,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou Jiangsu 221116,China;Linfen Coal Bed Gas Branch Company,East China Company,SINOPEC,Nanjing 210011,China)
出处
《地质科技情报》
CSCD
北大核心
2018年第6期239-244,共6页
Geological Science and Technology Information
基金
国家重大科技专项"煤层气井地电法数据处理技术"(2011ZX05035)
关键词
苏林分类法
水化学类型
折算水压头
水动力分区
Sulin taxonomy
hydro-chemical type
converted water pressure head
hydrodynamic partition
