Comparative studies of microscopic pore throat characteristics of unconventional super-low permeability sandstone reservoirs: Examples of Chang 6 and Chang 8 reservoirs of Yanchang Formation in Ordos Basin, China

摘要

It's difficult to evaluate the unconventional super-low permeability sandstone reservoir by conventional mercury injection test. In order to evaluate this kind of reservoir more efficiently, in this study, we mainly measure the microscopic pore throat characteristic parameters and the curves of the reservoir by constant-rate mercury injection test, such as the average pore radius, average throat radius, pore throat radius ratio, maximum throat radius and other parameters. The reservoir characteristic curves include the pore radius distribution, throat radius distribution, pore throat radius ratio, and capillary pressure.