煤田地质与勘探2017，Vol.45Issue(2)：69-74,6.DOI:10.3969/j.issn.1001-1986.2017.02.012
延川南地区水文地质条件及煤层气成藏
Groundwater conditions and relative CBM accumulation feature in Yanchuannan area
余林1
作者信息
- 1. 中石化华东油气分公司,江苏南京 210011
- 折叠
摘要
Abstract
Groundwater plays a controlling role in enrichment, accumulation and yield of coalbed methane. With production data, hydrochemistry and geochemistry are taken into account to study hydrodynamic occurrence and hydrochemistry fea-ture, influence, CBM reservoir formation and saturation. Typical accumulations are proposed according to hydrogeochemis-try conditions. Two types of groundwater exist in Yanchuannan area. NaHCO3 of acid low salinity (4×103 mg/L) is located in Tanping belt. Isotope fractionation proves powerful and carbon value is -36‰. Water head reaches as high as more than 700 m. CaCl2 of weak alkali and high salinity (4×104 mg/L) is distributed in Wanbaoshan belt. Fractionation works subtle and the value is -32‰. Head is no more than 700 m. Three types of groundwater conditions occur as follows: high pressure stagnant flow in Wanbaoshan, weak runoff flow in Tanping and seepage in the north and midst dominated by faults. Confined water and fault block lead to accumulations.关键词
煤层气/水文条件/成藏特征/成藏模式Key words
CBM/groundwater condition/accumulation feature/reservoir pattern分类
能源科技引用本文复制引用
余林..延川南地区水文地质条件及煤层气成藏[J].煤田地质与勘探,2017,45(2):69-74,6.
