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页岩气原地资源量定量计算对后续可动油气研究、经济性评价等起关键作用。通过对吐哈温吉桑地区中下侏罗统页岩含气性的研究,得到页岩现场解析总含气量为0.92~1.53m~3/t;计算含气量平均为1.33m~3/t,其中游离气约占47%、吸附气占49%、溶解气(包括水溶气及油溶气)占4%。研究认为,对应现场解析损失气的恢复,当损失时间较大时,直线恢复值比实际值小,多项式恢复值比实际值大,故使用直线、多项式恢复值的均方根值为损失量更合理。为了计算吸附气,引入吸附气饱和度(ε)概念,可以帮助理解吸附气在地质条件下的不饱和现象,使吸附气含量计算更符合地下实际。
The quantitative calculation of shale gas in-situ resources plays a key role in the follow-up of mobile oil and gas studies and economic evaluation. Through the study on the gas-bearing characteristics of Middle-Lower Jurassic shale in the Jusang area of Tuha Wen, the total gas content in the shale field was 0.92 ~ 1.53m ~ 3 / t, and the average gas content was 1.33m ~ 3 / t Of which 47% are free gas, 49% are adsorbed gas, and 4% are dissolved gas (including water-soluble gas and oil-dissolved gas). The results show that when the loss time is larger, the linear recovery value is smaller than the actual value, and the polynomial recovery value is larger than the actual value. Therefore, using the straight line, the root mean square value of the recovery value of the polynomial is the loss reasonable. In order to calculate the adsorbed gas, the concept of adsorbed gas saturation (ε) is introduced to help understand the unsaturated phenomenon of adsorbed gas under geological conditions and to make the calculation of adsorbed gas content more in line with the actual underground conditions.