大牛地气田太原组太 2 段是典型的低孔、低渗致密砂岩储层。因其低孔、低渗及非均质性强等原因，使气层识别和评价存在一定难度。 根据致密砂岩储层岩性控制物性以及物性控制含气性等特点，依据测井资料，建立了测井解释参数模型；应用无阻流量与声波时差、深侧向电阻率、泥质含量、孔隙度及含气饱和度的交会图法对太2 段有效气层进行识别，建立识别气层标准。 通过 23 口开发井测试层段的测井解释成果对该区确定的有效气层判别标准进行检验，其符合率达到 86.96%，证明了该方法的有效性。

The second member of Taiyuan Formation in Daniudi Gas Field belongs to typical compacted gas-bearing sandstone reservoir with low porosity and low permeability. Due to its low porosity, low permeability and strong heterogeneity, it is difficult to identify and evaluate the gas reservoir. According to the fact that lithology controls the physical properties, and physical properties control gas-bearing characteristics in the tight sandstone reservoir, the lithology, physical properties and electrical properties of Tai 2 member were analyzed. The result shows that Tai 2 member belongs to compacted gas-bearing sandstone reservoirs with low porosity and low permeability. Based on logging data, the interpretation parameter model was established. The crossplots of open flow capacity with acoustic travel time, deep lateral resistivity, shale content, porosity and gas saturation were respectively used to identify the effective gas-bearing layers, and its recognition standard was established. The log interpretation resulted from test layers of 23 development wells were used to test the standard of the effective gas reservoir with an interpretation coincidence rate of 86.96%. It proves the validity of the proposed method.