THE APPLICATION OF GEOSTATISTICAL INVERSION TO RESERVOIR PREDICTION OF L AREA IN SICHUAN BASIN

The technique of geostatistical inversion for reservoir prediction is based on geostatistics,and it combines seismic,geologic and logging data to simulate spatial distribution of reservoirs and predict the distribution of reservoirs.Through the gas field development of L area in Sichuan Basin,the paper generalizes a inversion route which is based on geostatistics inversion and is suitable for heterogeneous structural-lithological composite gas reservoir of Xujia river in Sichuan basin.It is based on the post-stack restrict sparse pulse deterministic inversion and proceed stochastic simulation of reservoir parameters which takes wave impedance data as the restriction condition and then predict beneficial reservoirs.The result shows that this method have the advantage of both high vertical resolution based on logging data and high horizontal resolution based on seismic data and is very helpful for identifying heterogeneous thin inter-bedded sand and shale reservoir.