Structural deformation of shale pores in the fold-thrust belt: The Wufeng-Longmaxi shale in the Anchang Syncline of Central Yangtze Block

The gas-rich Wufeng-Longmaxi shale has been intensely deformed within the fold-thrust belt of Yangtze Block. To better understand impact structural deformation on pore system, this paper systematically investigated matrix components, porosity and structures in core samples from theWufeng-Longmaxi shale, newly collected various domains first commercial gas field Central Block, Anchang Syncline. generally showed a positive relationship with total organic carbon content. Nevertheless, even at constant content, decreased syncline limb to hinge zone decreasing interlimb angle zone, which aligned strain during folding. artificial axial compression also confirmed that decrease was stronger an elevated stress relatively higher size strain, but aspect ratio shape increased. Even quartz failed resist effective under intensive deformation, changing correlation between negative. In contrast, spaces generated by slipping clay flakes accounted for content bulk porosity. Considering reduction caused pores, is rich fracture networks roof floor layers, may still be excellent exploration target Cited as: Guo, X., Liu, R., Xu, S., Feng, B., Wen, T., Zhang, T. Structural pores belt: Syncline Advances Geo-Energy Research, 2022, 6(6): 515-530. https://doi.org/10.46690/ager.2022.06.08