The characteristics of drainage water and its controlling effects on the favorable area of CBM in Shizhuangnan block,Qinshui Basin
Received date: 2017-03-01
Revised date: 2017-06-13
Online published: 2017-07-10
Based on the measured reservoir pressure and the water quality analysis data of 23 CBM wells drainaging more than 1 year in Shizhuangnan block,hydrogeological and hydrodynamic characteristics were studied using multi-methods such as Schoeller counter,Piper counter,and the influence of hydrogeological conditions on coalbed methane enrichment was discussed.The study indicated that the drainage water is mainly Na-HCO3 type which reflects the study area was in an open-semi closed hydrogeological environment,the hydrogen and oxygen isotopic values of drainage located near the national atmospheric precipitation line and proved that the initial source of drainage water was atmospheric precipitation.The study area was divided into runoff area in the northwest,weak runoff area in the south and the stagnant wake in the central area using conversion water level,and the water came from the northwest and south and flew into the stagnation zone.Hydrochemical parameters reflect the preservation condition in the stagnation zone are better than that in the runoff area and weak runoff area at both sides.Based on the parameters of hydrodynamic field and hydrochemical field,the parameter system of CBM favorable area optimization was established,and the favorable good target was selected using this system,and it gave a guide for the next CBM well layout.
Key words: CBM; Drainage water; Hydrogeochemistry; Hydrodynamic zoning; Shizhuangnan block
Guo Guang-shan,Liu Ying-hong,Zhang Miao,Lü Yu-min . The characteristics of drainage water and its controlling effects on the favorable area of CBM in Shizhuangnan block,Qinshui Basin[J]. Natural Gas Geoscience, 2017 , 28(7) : 1115 -1125 . DOI: 10.11764/j.issn.1672-1926.2017.07.006
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