X 凝析气田石炭系气藏包括X17，X14，X18，X10 等4 个井区。在岩性研究的基础上，分7 种岩性建立储层骨架参数图版，并根据储层岩性、岩相特征的差异，建立了玄武岩、流纹岩、次火山岩、砂砾岩岩电参数关系图版。在储层参数研究的基础上，采用多种方法确定不同岩性有效厚度划分的下限，为油藏描述提供了准确的储量参数。通过密闭取心井分析的含气饱和度、岩心分析孔隙度检验数字处理成果，计算的孔隙度和含气饱和度满足储量计算的误差要求，在X 气田石炭系天然气探明储量计算中发挥了重要作用。

The Carboniferous gas reservoir in X gasfield consists of four well blocks: well block X17, X14, X18 and X10. On the basis of lithology research, seven different reservoir matrix parametric charts are established. According to reservoir lithology and differences of the lithofacies characteristics, four types of litho-electrical parameters charts of basalt, rhyolite, irruptive rock, glutinite are set up. Based on the studies of reservoir parameters, a variety ofmethods are used to determine the lower limits of the effective thickness of different lithological division in order to provide accurate reserve parameters on reservoir description. Through coring wells gas saturation analysis and porosity test results, the calculated porosity and gas saturation results meet the error requirements of reserve calculation, which plays an important role in proved reserves calculation of Carboniferous in X gasfield.