Surface hydration-induced damage in tight oil-bearing sandy conglomerate reservoirs
Anbang Zhao, Shuheng Du, Yuan Zhang, Jinghong Hu, Bo Zhou, Yun Wei
发布时间：2026-03-18
关键词：Surface hydrationinduced damage in tight oilbearing sandy conglomerate reservoirs
摘要：Highlights Two distinct stages of interfacial hydration in conglomerates are first identified. Smectite boosts long-term conglomerate interfacial hydration. Carbon and silicon affect interfacial hydration differently. Calcium oxide, but not magnesium, promotes interfacial hydration.
阅读全文 PDF 引用The impact of forced closure on proppant distribution of hydraulic fracturing in shale formations
Tongxuan Gu, Hanyi Wang, Quan Gan, Shuang Zheng
发布时间：2026-03-18
关键词：The impact of forced closure on proppant distribution hydraulic fracturing in shale formations
摘要：Highlights The role of forced closure in reducing proppant settling within shale formations has been revealed for the first time. Forced closure is most effective with large fracture height, low fluid viscosity, low formation permeability, and high proppant concentration. Flowback rate and flush fluid injection have minimal impact. Forced closure is not recommended with ultra-low-density proppants.
阅读全文 PDF 引用Caving-enhanced geothermal system overwhelms fracturing- and pipe-enhanced geothermal system in heat extraction
Fangchao Kang, Tianjiao Li, Yingchun Li, Jinlong Men, Chun'an Tang
发布时间：2026-03-18
关键词：Cavingenhanced geothermal system overwhelms fracturing and pipeenhanced in heat extraction
摘要：Highlights Thermal responses and heat extraction performances of different enhanced geothermal systems (EGS) with distinct stimulation strategies are examined. Caving-EGS (C-EGS) yields the best heat extraction performance with a stable extraction rate over the entire lifespan. Fractures provide preferential flow paths and causes thermal drawdown in fracturing- and pipe-EGS. C-EGS has great potential in large-scale deep geothermal energy extraction.
阅读全文 PDF 引用Instability mechanism and failure characteristics of underground cavern in block system under the action of seismic waves
Xiao Wang, Jinxiao Liu, Gaoshuo Zhang, Wenxin Li, Changdi He
发布时间：2026-03-18
关键词：Instability mechanism and failure characteristics of underground cavern in block system under the action seismic waves
摘要：Highlights Investigated block instability using wave propagation theory. Simulated seismic effects on block sliding using Universal Distinct Element Code. Found block sliding depends on seismic and geological conditions.
阅读全文 PDF 引用Gaborlet-guided sparse filtering: A novel intelligent method for lithology identification by vibration signals while drilling
Jian Hao, Danqi Zhang, Zhenqi Song, Jinrui Wang, Qi Wang, Heqing Liu
发布时间：2026-03-18
关键词：Gaborletguided sparse filtering A novel intelligent method for lithology identification by vibration signals while drilling
摘要：Highlights This study introduces a novel Gaborlet-guided sparse filtering (GSF) method to improve feature extraction from noisy drilling vibration signals, significantly enhancing lithology identification accuracy. Effective multiscale and multidirectional feature extraction: The GSF method utilizes Gabor wavelets to initialize sparse filter (SF) weight vectors, enabling the capture of multiscale and multidirectional features crucial for precise lithology classification. Overfitting prevention via regularization: The GSF model employs L1/2 norm regularization, effectively addressing overfitting while ensuring reliable feature extraction from raw drilling data. Exceptional classification performance: Experimental results show that the proposed method achieves 94.07% accuracy on the training set and 88.32% on the testing set, outperforming three other existing lithology identification techniques.
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