The deep shale gas ($\geq 3500$ m) in the Z205 well area is a critical exploration and development target in the Sichuan Basin. The shale gas reservoirs of the Upper Ordovician Wufeng Formation -- Lower Silurian Longmaxi Formation (Long 1$_1$ submember) in this area are characterized by deep burial and significant vertical and lateral heterogeneity. The Long 1$_1$ submember is subdivided into the Wufeng Formation, Long 1$_1^1$, Long 1$_1^2$, Long 1$_1^3$, and Long 1$_1^4$. This study conducts a detailed stratigraphic comparison based on integrated logging, core analysis, and analytical test data from the well area, clarifying the longitudinal and lateral distribution patterns of the reservoi... More >

In shale reservoirs, fracturing fluid can be easily absorbed into the pore space due to the strong capillary force of shale. These invading fluids can impact the rock mechanical properties and creep behavior characteristics of shale under water-rock interaction. This paper discussed the influence of water-rock interaction on the mechanical parameters and creep behavior of shale rocks based on shale hydration swelling experiments, acoustic-triaxial compression tests, and shale creep experiments. The experiments show that: There are two stages of shale hydration swelling: rapid swelling stage and stable swelling stage. Temperature mainly impacts the hydration swelling rate, while the type of l... More >