非常规气储量计算方法分析

Analysis on Calculation Method of Unconventional Gas Reserves

随着非常规气在全球油气勘探、开发及交易中扮演越来越重要的角色,如何可靠计算非常规气储量必然成为关注的焦点。非常规气主要包括致密砂岩气、煤层气和页岩气等。非常规气藏通常都具有储层致密、低孔低渗、流体赋存方式多样、储层非均质性强等特点,同时每种非常规气藏又各具特点,导致各类非常规气储量计算面临不同的问题。通过解剖目前海外项目中非常规气资源储量计算方法认为:目前常规气储量计算的动态法和静态法用于非常规气储量计算存在不足;而将常规气藏储量计算的动、静态法相结合用于非常规气藏储量计算才能获得相对可靠的计算结果。

As unconventional gases play an important role in global oil and gas exploration,development and transaction gradually,the reserve of unconventional gases has caused the extensive concern of the world.Therefore,how to calculate unconventional gas reserve becomes a spotlight.Up to now,development of unconventional gases can only be found in tight sand gas,coal bed methane and shale gas reservoirs.Geological and producing characteristics of unconventional gas reservoirs are different from conventional ones,and each type of unconventional gas has distinct characteristics,which leads to exclusive problems emerging in unconventional gas reserve evaluation.Conducted is comparative analysis on unconventional gas reserve evaluation methods used in overseas development projects and analysis results show that dynamic method and static method used in unconventional gas reserve evaluation have respective disadvantages and reliable and reasonable reserve evaluation results can be obtained only when the dynamic evaluation method is combined with the static evaluation method.