Gravity log has such advantages as wide investigation range, small effect of caliper variation, short repeated observation cycle, no limit for depth of the interested zone.

重力测井具有探测范围大、受井径变化影响小、重复观测周期短、不受目的层埋深限制等优点。

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And the height of water flowing fractured zone in overburden strata is calculated by the empirical formula and is measured with a simple hydrological observation method according to drilling on spot.

用经验公式对覆岩导水裂隙带高度进行了计算，采用简易水文观测法对覆岩导水裂隙带高度进行了测定。

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For this, a set of observation system is set up in gas cap zone, gas-oil contact and oil zone.

并在气顶区、油气界面及油区建立了一套观察系统。

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