Reservoir characterization of Chang 7 member shale: A case study of lacustrine shale in the Yanchang Formation, Ordos Basin, China

The composition of minerals, together with residual hydrocarbon, leads to the lower porosity and adsorption quantity for C7-3SM shale. Compared with C7-2SM shale, C7-3SM shale is not good at generating and storing natural gas. Overpressure may be the reason for the increase in acoustic travel time (AC) values with progressive burial depth for C7-3SM shale.