摘要
页岩气藏是一种非常规气藏,由于气藏特征的特殊性导致储量计算方法有别于常规气藏。首先探讨了页岩气藏的特殊性,其一是存储特征为形式上游离气和吸附气并存、空间上孔隙和裂缝同在;其二是产气机制主要为游离气的扩散和吸附气的解吸。在此基础上,总结了计算页岩气储量的方法,主要有类比法、容积法、压力/累计产量法、物质平衡法、递减曲线分析等,并讨论了各种方法的适用条件。同时,指出在页岩气储量计算中应特别重视孔隙度、裂缝、吸附气、含气饱和度等几个关键问题,并介绍了这些参数的确定方法。
As an unconventional gas reservoir, the Calculation method of shale gas differs from conventional gas reservoirs. Shale gas reservoir has two special characters： one is that shale gas occurs as free gas and adsorbed gas, which are stored in natural fractures and matrix pores, the other is that the production mechanism shows two main processes including diffusion of free gas and desorption of adsorbed gas. Many calculation methods of shale gas reservoirs such as analog method, volumetric method, pressure and cumulative production method, material-balance method, production decline method are summarized, and the applicable conditions and limitations of all methods are discussed. Some important issues are also pointed out such as adsorption capacities, natural fractures, quantification methods of porosity and gas saturation.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2009年第3期466-470,共5页
Natural Gas Geoscience
关键词
页岩气
容积法
动态法
吸附气含量
裂缝
Shale gas
Volumetric method
Dynamic method
Adsorbed gas
Natural fractures.
