| 崔福庆.楚玛尔河黏性土与砂土导热系数试验研究[J].地质与勘探,2021,57(3):621-630 |
| 楚玛尔河黏性土与砂土导热系数试验研究 |
| Experimental study on thermal conductivity of clayey and sandy soil from the Chumar River area |
| 投稿时间：2020-08-10 修订日期：2020-12-29 |
| DOI：10.12134/j.dzykt.2021.03.015 |
| 中文关键词: 多年冻土 导热系数 RBF神经网络 楚玛尔河 青藏工程走廊带 |
| 英文关键词: permafrost frozen soil, thermal conductivity, RBF neural network, Chumar River,Qinghai-Tibet project corridor |
| 基金项目:国家自然科学基金(编号：51574037、41502292)和中国交通建设股份有限公司应用基础研究(编号：2018-ZJKJ-PTJS03)资助 |
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| 中文摘要: |
| 为探究青藏工程走廊带楚玛尔河地区冻融土导热系数的基本规律，采用瞬态平面热源法测试了148个冻土试样和88个融土试样导热系数。对楚玛尔河地区黏性土和砂土导热系数的总体特征及影响因素进行分析；对黏性土、砂土导热系数与干密度和含水率之间进行二元回归方程拟合，并分别建立黏性土、砂土RBF神经网络预测模型。结果表明：楚玛尔河黏性土导热系数分布较为集中，砂土导热系数离散度高，分布范围较广；二元回归方程对黏性土、砂土导热系数平均拟合优度较低；与二元回归方程相比，以干密度和含水率作为输入因子所建立的楚玛尔河黏性土、砂土导热系数RBF神经网络预测模型具有更高的精确度。研究成果可有效预测青藏工程走廊带土体导热系数，对冻土温度场计算具有重要指导意义。 |
| 英文摘要: |
| Located in Wangcang County and Cangxi County, northwestern Sichuan Basin, the Jiulongshan structure is characterized by a large structure, high uplift, good preservation conditions, long-term vertical production and abundant borehole expressions. This work focuses on the geological model and forward modeling of the Lower Permian Maokou Formation reservoirs in the Jiulongshan structural area, clarifying the reservoir development location, finding the corresponding seismic facies characteristics, and grading the reservoirs. Based on logging response characteristics, reservoir space, reservoir thickness and curvature, the wave equation is used to predict the seismic response characteristics of the Lower Permian Maokou Formation. Forward modeling results show that the geophysical response characteristics of the isolated caverns in the Maokou Formation are ascending and beating in the same phase, and the amplitude is weakened. The geophysical response of the reservoirs in the Maokou Formation is the discontinue distortion and pull down of lineups in the top of the Maokou Formation. On this basis, two seismic response identification modes of isolated caverns and fracture-cavity systems are summarized, which provide a reference for reservoir prediction in the study area. |
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