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首先对低阻油气层的成因机理和低孔低渗油气层的储层特征进行了分析,认为较高粘土附加导电和微孔隙发育是低阻、低孔低渗油气层的2个主要特征;然后从这2个特征出发,通过实验与理论分析,探讨了常用测井解释模型——W-S模型和双水模型难以合理解释低阻、低孔低渗油气层的内在必然性。根据这一认识,从实验和理论角度对粘土和微孔隙的导电机理进行了深化。在此基础上,将岩石各组分考虑为并联导电路径,建立了三低测井解释模型。最后对模型进行了验证,结果表明三低测井解释模型能够合理解释较高粘土附加导电和微孔隙发育的现象,可以作为低阻、低孔低渗油气层的测井解释模型。
Firstly, the genesis mechanism of low resistivity oil and gas reservoirs and the reservoir characteristics of low porosity and low permeability oil and gas reservoirs are analyzed. It is concluded that the additional conductivity and micropore development of higher clay are two main characteristics of low resistivity and low porosity and low permeability reservoirs. Then from the two characteristics, through the analysis of the experiment and theory, we discuss the inherent necessity of well log interpretation model -WS model and dual-water model can not reasonably explain the low-resistance, low-porosity and low permeability reservoirs. Based on this understanding, the conductive mechanism of clay and microporosity has been deepened both experimentally and theoretically. On this basis, the rock components are considered as parallel conduction paths, and a three-low log interpretation model is established. Finally, the model is validated. The results show that the three low-log interpretation model can reasonably explain the phenomenon of additional conductivity and micropore development in higher clay and can be used as well logging interpretation model for low-resistance and low-porosity and low permeability reservoirs.