川南龙马溪组含气页岩热导率实验研究

Thermal conductivity of gas-bearing shale of the Longmaxi Formation in the southern Sichuan

程超 林海宇 蒋裕强 冯磊 夏雨 牟春濠

CHENG Chao LIN Haiyu JIANG Yuqiang FENG Lei XIA Yu MU Chunhao

西南石油大学 地球科学与技术学院, 成都 610500

School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China

以川南龙马溪组深层含气页岩为研究对象，开展了页岩热导率及其配套实验研究，以探索深层含气页岩热导率特征及其影响因素。实验结果显示，川南龙马溪组含气页岩热导率主要分布在2.0~3.0 W/（m·K）之间，实测最大值为5.15 W/（m·K），最小值为1.22 W/（m·K），平均值为2.50 W/（m·K）。在此基础上探讨了川南龙马溪组深层含气页岩热导率与矿物组分、孔隙度、TOC以及温度的关系，深入分析了含气页岩热导率的影响因素。页岩的热导率与矿物组分密切相关，其中黄铁矿和石英是对热导率影响较大的矿物；热导率随页岩储层孔隙度的增加而降低；随TOC含量的增大而降低，且在TOC较低时热导率下降得快，在TOC较高时热导率呈缓慢下降；温度是影响热导率最主要的因素，受页岩的TOC含量制约，当TOC含量较低时，热导率随温度的升高而降低，而TOC含量较高时，热导率随温度的升高而升高。

The deep gas-bearing shale in the Longmaxi Formation in the southern Sichuan Basin was used to explore basic characteristics of deep gas-bearing shale and factors controlling those characteristics, such as mineral composition, TOC content, porosity and thermal conductivity. The thermal conductivity of the gas-bearing shale in the Longmaxi Formation in the study area mainly ranged 2.0-3.0 W/(m·K), with a maximum measured value of 5.15 W/(m·K), and a minimum value of 1.22 W/(m·K), averaging 2.50 W/(m·K). On this basis, the relationships between thermal conductivity and mineral composition, porosity, TOC content and temperature were discussed, and the influencing factors of thermal conductivity were analyzed. The thermal conductivity of shale is closely related to mineral composition. Pyrite and quartz are the minerals that have a great influence on thermal conductivity. Furthermore, thermal conductivity decreases with the increasing porosity of shale reservoir. With the increase of TOC content, thermal conductivity decreases. When the value of TOC content is low, the corresponding thermal conductivity decreases rapidly. When the value of TOC content is high, thermal conductivity decreases slowly. Temperature is a most important factor affecting thermal conductivity, which is restricted by the TOC content of shale. When TOC content is low, thermal conductivity decreases with the increase of temperature. When TOC content is high, thermal conductivity increases with the increase of temperature.

国家自然科学基金联合基金项目"页岩气低成本高效钻完井技术基础研究"（U1262209）和2018年四川省创新创业训练计划项目联合资助。

https://doi.org/10.11781/sysydz201902289