Recently, deep and ultra-deep shales (depth >3500 m) of the Lower Paleozoic Wufeng–Longmaxi formations (WF–LMX) have become attractive targets for shale gas exploration development in China, their contents may be influenced by occurrence water to some extent. However, content its distribution different nanopores rarely been reported. In this study, a suite WF–LMX samples (5910–5965 m depth) ...

The stress-strain relationship in shales is generally time-dependent. This concerns their long-term deformation unconventional reservoirs, and its influence on the situ stress state therein. paper presents an experimental investigation time-dependent of Longmaxi shale gas shale. A series creep experiments subject samples to long-term, multi-step triaxial compression. It found that exhibit varyi...

The sediment provenance influences the formation of shale gas sweet-spot interval Upper Ordovician–Lower Silurian Wufeng–Longmaxi from Yangtze Platform, South China. To identify provenance, mineralogy and geochemistry were investigated. methods included optical microscopy analysis, X-ray diffraction testing, field-emission scanning electron imaging, major trace element analysis. is mainly compo...

Conventional hydraulic fracturing techniques typically consume large amounts of water when producing shale gas. Fracking fluids may cause environmental pollution. In contrast, supercritical carbon dioxide (scCO2) (above 31.8°C, 7.29 MPa) can displace CH4 in reservoirs. Achieve CO2 sequestration while increasing the gas production. We studied mechanical properties and fracture characteristics a ...

understanding the performance and role of each formation in a petroleum play is crucial for the efficient and precise exploration and exploitation of trapped hydrocarbons in a sedimentary basin. the lorestan basin is one of the most important hydrocarbon basins of iran, and it includes various oil-prone potential source rocks and reservoir rocks. previous geochemical studies of the basin were n...