怀4井氦气观测初始采用井口至水面的井管静空间获取气体，氦气测值随水位发生变化，且井管静空间大，新旧气体易混合，进入测氦仪传感器的新鲜气体比例小，测值稳定，一些应力场作用信息被掩盖。为此，将不锈钢杯集气漏斗悬于水面上2 m处收集观测井自然逸出气，新鲜的逸出气及时有效地进入测氦仪传感器，有效避免水位涨落影响，观测数据有明显变化，观测效果较理想。
In the digital gas geochemical observation of the underground fluid, it is very important to obtain the gas in time and effectively for observing the helium. Before reconstructing, the gas acquisition funnel for helium observation in Huailai No.4 well is fixed on the mouth of well tube. It is found by the detail analysis that the measured values change with the water level. Since the static space is too large to make the new gas mixed with the old, the fresh gas is in small percentage among the all gas acquired into the helium detector sensor, so the measured value becomes relatively stable, and some stress field role information is masked. We reconstruct the gas acquisition device by installing the gas collecting funnel into the well pipe and suspending 2 m above water surface for the natural escape venting. With the new acquisition device, the fresh gas vents effectively into the sensor of helium measuring instrument and the influence of water level on the observation data is basically avoided. After the reconstruction, the change of observation data increase obviously, and effect of observation becomes more ideal.
2018,39(2): 160-164 收稿日期：2017-01-19
DOI：10.3969/j.issn.1003-3246.2018.02.023
作者简介：宋晓冰(1963-),女,陕西西安人,高级工程师,主要从事地下流体监测预报工作
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