Based on sediment supplies

sedimentary hydrodynamic conditions

channel structures and features

the paper discusses the relationship between the vertical/lateral structures of the sedimentary microfacies and reservoir productivity in Da12-Da66 wellblocks

Daniudi gas field.The result indicates that the combinations of source supplies and sedimentary hydrodynamic conditions affectes the vertical distribution of reservoir productivity.Under the condition of abundant sediment supplies

stable and strong hydrodynamic conditions

the formations are mostly payzones with medium to high productivity.Reservoirs in the central part of distributary channel microfacies have been commonly tested relatively stable productivity and are mostly payzones with medium to high productivity.In contrast

reservoirs at the edge of distributary channel have been usually tested with the feature of unstable productivity.The payzones with medium to high productivity grow usually in the intersection of two channels with strong hydrodynamic conditions.In addition

because of complexity of meander channel and great shape changes

it is difficulty to identify and discover.Generally

productivity is lower for unstable channel except for areas with strong hydrodynamic conditions.The study results coincide with the production tests in Da12-Da66 wellblocks.