Sulige gas field is a typical lithology-controlled gas reservoir with low permeability

low pressure

and low abundance.Development of this gas field faces varisou challenges

such as low degree of well control in drilling area

uncertainty of micro structure in some area

strong heterogeneity of reservoir and unstable sand distribution

making horizontal well drilling being highly risky.To guarantee drilling success and increase the ratio of target penetration

we first performed high-resolution stratigraphic correlation based on proper selection of marker beds

and then carried out detailed studies of the micro structure

deposition and reservoir distribution.Based on seismic prediction of gas-bearing properties and under the constraints of structure and sedimentary facies

we built a delicate 3D geologic model with fine geologic modeling technique and micro structure forecasting technology.With this model

we mapped the reservoir distribution and micro structures before drilling operation.During drilling operation

these study results can be integrated with the drilling

mud logging

MWD data to predict the change of subsurface microstructures and rapid identification of bottom hole lithology

which in turn can be used in the real-time modification of geologic model and drilling design.