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致密砂岩气层表现出明显的低孔隙度、特低渗透率及复杂的孔隙结构特征,给测井储层评价带来了巨大的挑战。选定鄂尔多斯盆地某区的致密砂岩气层为研究对象,根据储层的“四性”关系分析,以常规测井资料为基础,辅以自然伽马能谱测井资料进行研究。首先,利用自然伽马能谱测井准确求取储层的泥质含量;然后,根据密度测井计算储层孔隙度,并结合孔隙度和泥质含量预测储层的渗透率;最后,基于Archie公式,计算含气饱和度,建立研究区气层识别图版,以此为基础识别致密砂岩气层。
Tight sandstone gas reservoirs show obvious features of low porosity, ultra-low permeability and complicated pore structure, which pose a great challenge to well logging evaluation. Tight sandstone gas reservoirs in a certain area of Ordos Basin are chosen as the research object. Based on the analysis of reservoir “four sex ” relationship and based on conventional well logging data, supplemented by gamma ray spectrometry logging data. First of all, using the gamma ray spectrometry logging to get the shale content of the reservoir accurately, then calculating the reservoir porosity according to the density logging, and predicting the permeability of the reservoir according to the porosity and shale content. Finally, Archie formula to calculate the gas saturation, the establishment of the study area gas identification plate, as a basis for identifying tight sandstone gas layer.