殷树军,张兆谦,赵海波,谢鹏,陈安琦,夏文豪
YIN Shujun,ZHANG Zhaoqian,ZHAO Haibo,XIE Peng,CHEN Anqi,XIA Wenhao

• 1:多资源协同陆相页岩油绿色开采全国重点实验室
• 2:中国石油大庆油田有限责任公司勘探开发研究院

摘要(Abstract)：

松辽盆地青山口组古龙页岩在含油性较好的背景下仍普遍表现出低电阻率特征，其导电规律尚不明确，制约了含油性评价的准确性。为了探究古龙页岩低电阻率现象的成因机制，基于数字岩心建模及电阻率模拟，标定有效介质导电模型中的关键渗滤参数，系统分析古龙页岩黏土含量、黏土电阻率及地层水电阻率等因素对电阻率的影响。结果表明：地层水电阻率对总体电阻率的影响有限，最大差异仅约为5Ω·m；黏土电阻率在低含水饱和度条件下作用显著，但黏土含量是主导电阻率变化的核心因素，高黏土含量显著增强附加导电性，导致电阻率大幅降低；当黏土体积分数为40%时，模拟电阻率约为6.2Ω·m，与实际测井数据吻合良好。因此，古龙页岩低电阻率现象主要由高黏土含量及其附加导电性控制。研究成果揭示了古龙页岩的导电机制，为含油性评价提供理论依据与技术支撑，对页岩油资源开发具有重要指导意义。
Gulong shale in Qingshankou Formation of Songliao Basin exhibits widespread low-resistivity characteristics despite its favorable oil-bearing properties, with unclear understanding of conductivity mechanisms which hinders the accuracy of oil-bearing evaluation. In order to explore the genesis mechanism of low-resistivity phenomenon in Gulong shale, through digital core modeling and resistivity simulation, key percolation parameters in effective medium conductivity model are calibrated to systematically analyze the influence of clay content, clay resistivity and formation water resistivity on resistivity. The results show that formation-water resistivity variation has limited impact on overall resistivity, with a maximum difference of approximately 5 Ω·m. Clay resistivity plays significant roles under low water saturation conditions, while clay content is the key factor dominating resistivity variation. High clay content significantly enhances additional conductivity, leading to a substantial reduction in resistivity. When clay content reaches 40%, the simulated resistivity is approximately 6.2 Ω·m, with good consistence with the actual logging data. Therefore, Gulong shale's low resistivity are primarily controlled by its high clay content and its additional conductivity. The research reveals conductivity mechanisms of Gulong shale and provide theoretical basis and technical support for accurate oil-bearing evaluation, being of great guiding significance for shale oil resources development.

关键词(KeyWords)： 松辽盆地;青山口组;数字岩心;有效介质理论;导电规律;电阻率
Songliao Basin;Qingshankou Formation;digital core;effective medium theory;conductivity laws;resistivity

Abstract:

Keywords:

基金项目(Foundation): 新型油气勘探开发国家科技重大专项“松辽盆地白垩系陆相页岩油勘探开发技术与集成示范”(2024ZD1404902);; 中国石油天然气股份有限公司油气重大专项“陆相页岩油地球物理建模关键技术研究”(2023ZZ15YJ02)

作者(Author): 殷树军,张兆谦,赵海波,谢鹏,陈安琦,夏文豪
YIN Shujun,ZHANG Zhaoqian,ZHAO Haibo,XIE Peng,CHEN Anqi,XIA Wenhao

DOI: 10.19597/J.ISSN.1000-3754.202509044

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