摘要
页岩气藏是一种自生自储的非常规气藏,在进行储量计算的时候,不仅要考虑游离气的影响,更要考虑吸附气的作用。总结了类比法、容积法、物质平衡法、递减曲线法等多种储量计算方法,并阐述了它们的适用范围,对目前储量计算中存在的几个问题进行了讨论。类比法适用于勘探前期,容积法适用于开发前期,物质平衡法不太适用于页岩气藏,递减曲线法适用于气体流动达到拟稳定流动之后。常用的Langmuir等温吸附模型适用于单分子层,没有考虑多组分竞争吸附机理。进行储量计算的时候,不可忽略固态干酪根中的溶解量,吸附相视孔隙度占据部分孔隙空间。因此,需要加强对吸附模型、吸附相密度和固态干酪根中溶解气的研究,以便求取更加精确的页岩气藏储量。
The shale gas reservoir is an unconventional gas reservoir of self-generating and self-preserving. During the calculation of reserves, we has to not only consider the impact of free gas, but also consider the effect of adsorbed gas. A sort of multiple reserve calculation methods such as the analogy, volumetric method, material balance method, decline curve method were summarized and their scopes were explained. Several problems in the current calculation of reserves were discussed. The analogy is suitable for the early exploration period, the volumetric method is suitable for the early development period, the material balance method is not ap- plicable to shale gas reservoirs, and the decline curve method is suitable for the gas flow after reaching the pseudo steady flow. Now the Langmuir adsorption isotherm model is commonly used for the single molecular layer, without considering the multi-component competitive adsorption mechanism. During the reserves calculation, the shale gas reserves in the dissolved solid kerogen and the ap- parent porosity of adsorption phase which occupied part pore space can not be ignored. Therefore, the adsorption model, the density of adsorbed phase and solid kerogen dissolved gas in the study should be strengthened in order to strike a more accurate shale gas reserves.
出处
《油气藏评价与开发》
CSCD
2017年第3期67-73,共7页
Petroleum Reservoir Evaluation and Development
基金
国家科技重大专项"涪陵地区五峰组-龙马溪组页岩气压裂及采气规律研究"(2016ZX05060026)
国家科技重大专项"基于非线性渗流的海上砂岩稠油油藏剩余油精细表征研究"(2016ZX05025001)
关键词
页岩气
储量计算
容积法
物质平衡法
递减曲线法
溶解气
shale gas, ealeulation of reserves, volumetric method, material balance method, decline curve method, dissolved gas
作者简介
张茂林（1965-），男，博士，教授，油气藏工程数值模拟研究。
