Experimental study on the hydraulic fracture propagation of laminar argillaceous limestone continental shale

• DOI: 10.3389/feart.2023.1193205
• Publication Date: 2023-07-14T02:02:03Z
• Authors: Zilin Zhang; Anhai Zhong; Feng Yang; Liaoyuan Zhang; Mingjing Lu; Lu Chai; Lianchong Li
• Keywords: Bed; Brittleness; Bedding

Laminar argillaceous limestone continental shale is an important oil reservoir in Jiyang Depression, Bohai Bay Basin of China. Affected by the laminar structure, spatial propagation morphology hydraulic fracturing not clear. To reveal law pathway marl shale, mineral content and basic rock mechanics test are firstly carried out on cores from wells Depression. Secondly similar material with standard-size large-size manufactured processed. Finally, combined physical model experiments, acoustic emission moment tensor inversion techniques, experiments under different stress differences conducted. The experimental results show that situ (confining stresses), lithological distribution jointly affect mode fractures. As horizontal difference increases, stimulated volume gradually decreases, number shear fractures decreases accordingly. Macroscopically, pump pressure curve shows obvious fluctuation case lower difference, which external performance fracture initiation–obstruction–turning–penetrating–obstruction–turning. brittle plastic minerals has a significant impact complexity, particularly layers high have inhibitory effect propagation. weakly cemented lamination or bedding plane easy to capture make it propagate along plane, thereby increasing complexity network. research expected provide theoretical reference for design optimization parameter exploration development.