文献类型：期刊文献

英文题名：Fracture Propagation Modes of Lower Cambrian Shale Filled with Different Quartz Contents under Seepage-Stress Coupling

作者：Wu, Zhonghu Wang, Shuang Chen, Jun Song, Huailei Wang, Wentao Wang, Ruyue Liu, Hao

第一作者：Wu, Zhonghu

通信作者：Wang, S[1];Wang, S[2]

机构：[1]Shandong Univ, Sch Qilu Transportat, Jinan 250002, Peoples R China;[2]Shandong Univ, Geotech & Struct Engn Res Ctr, Jinan 250061, Peoples R China;[3]Guizhou Univ, Coll Civil Engn, Guiyang 550025, Guizhou, Peoples R China;[4]Guizhou Univ, Coll Resources & Environm Engn, Guiyang 550025, Guizhou, Peoples R China;[5]Guizhou Univ, Key Lab Karst Georesources & Environm, Minist Educ, Guiyang 550025, Guizhou, Peoples R China;[6]Guizhou Inst Technol, Guiyang 550003, Guizhou, Peoples R China;[7]SINOPEC Petr Explorat & Prod Res Inst, Beijing 100083, Peoples R China;[8]Guizhou Univ, Coll Min, Guiyang 550025, Guizhou, Peoples R China

第一机构：Shandong Univ, Sch Qilu Transportat, Jinan 250002, Peoples R China

通信机构：corresponding author), Guizhou Univ, Coll Resources & Environm Engn, Guiyang 550025, Guizhou, Peoples R China;corresponding author), Guizhou Univ, Key Lab Karst Georesources & Environm, Minist Educ, Guiyang 550025, Guizhou, Peoples R China.

年份：2022

卷号：2022

外文期刊名：GEOFLUIDS

收录：;Scopus(收录号：2-s2.0-85135620332);WOS:【SCI-EXPANDED(收录号:WOS:000872100400001)】；

基金：This research was supported by the National Natural Science Foundation of China (Project No. 52104080) and Guizhou Science and Technology Fund (Project No. [2021]401).

语种：英文

摘要：The content and spatial distribution of brittle minerals, such as quartz, are important factors in determining the fracture initiation mechanism induced by hydraulic fracturing in shale reservoirs. To further research the impact of quartz content in shales of the Lower Cambrian Niutitang Formation in northern Guizhou on the fracture expansion of its reservoir, 7 groups of randomly filling shale models with different quartz contents were established using rock failure process analysis (RFPA(2D)-flow) code for numerical test studies under seepage-stress coupling, and 5 samples were also subjected to uniaxial compression tests using the INSTRON 1346 electrohydraulic servo-controlled material testing machine (200T). The results show that the average growth rate of the compressive strength and the fracture proportion for a quartz content of 50% to 65% are 4.22 and 1.15 times higher than those for 35% to 50%, respectively. Fractures sprout, expand, and breakdown in the shale matrix or at the junctions of the shale matrix and quartz grains. The mechanical properties and pattern of the fracture extension of the shale in the physical tests are similar to those in the numerical tests, indicating the reliability of the numerical simulations. The fractal dimension curves at different stress levels are divided into three stages: flattening, increasing, and surging, and the fractal dimension value for a quartz content of 50%similar to 65% at a 100% stress level is 1.02 times higher than that for 35%similar to 50%. The high degree of natural fracture development in high quartz content formations in shale gas reservoirs is of some reference value for logging data. The research results provide a reference value for the content and spatial distribution of brittle minerals for the initiation mechanism and fracture propagation of hydraulic fracturing in shale reservoirs.