大牛地气田DK30-D12井区盒2段致密砂岩气藏具有低孔、低渗及低产的特点。储层特征及产能分布具有极强的非均质性。受储层及含气性的影响，致密砂岩气层的测井响应特征复杂，导致气层测井识别和评价困难。该段气层测井响应特征分析表明，中子和电阻率测井参数在气层处反映灵敏。采用中子、电阻率与密度测井相结合，重构指示气层含气性的特征参数K1和K2，放大气层的响应特征,建立根据特征参数定性评价气层无阻流量级别的图版；并根据中子、密度对天然气的反映，建立了基于密度、中子孔隙度差值的含气当量与测试无阻流量的关系式，实现了定量计算致密砂岩气层无阻流量的目的。

The tight gas reservoir of He-2 member in DK30-D12 well area,Daniudi gas field is characterized by small porosity,low permeability and minor product.The heterogeneity to reservoir and productivity distribution occurs.The complexity of logging response results in the difficulty of identification and evaluation for the tight gas reservoir which was affected by physical property of reservoir and gas-bearing.By analyzing the features of logging response within this member,the parameters of neutron and resistivity logging are very sensitive.Thus,in combination with neutron,resistivity and density logging,this paper reconstructs feature parameters K1,K2 and establishes K1—K2 pattern which can qualitative evaluate gas AOF(absolute open flow).Additionally,in the light of different reflection toward gas between neutron and density logging,a relation between test nonresistance outflow and gas-bearing content which varies with different neutron and density logging is built,thus the gas AOF can be quantitative evaluation.
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