复杂泥质砂岩储层测井解释模型研究

Research on logging interpretation model of complex clayed sandstone reservoir

（1.吉林大学地球探测科学与技术学院，吉林长春130026；2.中国石油与天然气集团公司大庆石油管理局钻探集团测井公司，黑龙江大庆163412）

Geo-exploration and Technology College, Jilin University, Changchun 130026, China

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 of low resistivity reservoirs and the characteristic of low porosity& permeability reservoir were analyzed. The results indicate that relatively high additional conductivity of clay and vegetal micro pore are the two main characteristics of low resistivity reservoir and low porosity & permeability reservoir. Then, from the above two characteristics and by experimental and theoretical analysis, the intrinsic necessity for WS model and dual water model hard to reasonably explain low resistivity reservoir and low porosity & permeability reservoir was probed. Based on the cognition, the conductivity mechanism of clay and micro pore was deepened from experimental and theoretical aspect. After that, taking the rock components as paralleling conductive path; “three low” (low resistivity, low permeability and low porosity) model was established. Finally, the model was verified. The results show that “three low” model can reasonably interpret relatively high additional conductivity of clay and vegetal micro pore, and can be regarded as logging interpretation model for low resistivity reservoir and low porosity & permeability reservoir.