Abstract: 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.

Key words: heterogeneity, microstructure, geologic modeling, geosteering, horizontal well, Sulige gas field