考虑干酪根中溶解气的页岩气藏储量计算方法  

A New Method to Calculate Shale Gas Reserves Considering Dissolved Gas in Kerogen

作　　者：杨龙[1] 梅海燕[1] 张茂林[1] 袁恩[1] 

机构地区：[1]西南石油大学石油与天然气工程学院,成都610500

出　　处：《新疆石油地质》2016年第5期602-605,共4页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2016ZX05027004;2016ZX05060006)

摘　　要：前人在计算页岩气储量时未考虑干酪根中溶解的页岩气,但已有学者证明,干酪根中也溶解大量的页岩气,在进行储量计算时不能忽略。不考虑干酪根中溶解气的储量计算方法,不能真实、准确地计算页岩气藏的储量。在前人关于页岩气储量计算方法的基础上,建立了同时考虑吸附相密度、基质和裂缝孔隙体积随压力变化、吸附相体积随压力变化以及储存在干酪根中溶解气的物质平衡方程。通过实例计算可知,溶解气占据总储量的4.69%左右,不考虑溶解气计算出来的自由气储量、吸附气储量和总储量都偏大。因此,为了确保储量计算的准确性,在进行储量计算时必须将溶解气考虑在内。Predecessors did not consider the dissolved shale gas in kerogen when calculating the shale gas reserves. But it has been proved by some researchers that large amount of shale gas dissolved in kerogen can not be ignored in the calculation. The reserves calculation method ignoring the dissolved gas in kerogen can’t be used to truly and accurately calculate the reserves in shale gas reservoirs. Based on the previous calculation methods for shale gas reserves, a new material balance equation is established considering adsorbed phase density, volumetric variations of matrix and fracture pores with pressure, changes of adsorbed phase volume with pressure and dissolved gas in kerogen. Case study shows that dissolved gas accounts for about 4.69% of the total reserves. Reserves of free gas, adsorbed gas and total gas will be overestimated if dissolved gas is not taken into consideration. Therefore, in order to ensure the accuracy of reserves calculation, dissolved gas must be taken into account in the reserves calculation.

关 键 词：干酪根 页岩气 基质 裂缝 溶解气 孔隙度 物质平衡方程 储量计算 

分 类 号：TE15[石油与天然气工程—油气勘探]