Description And Prediction Of Tight Sandstone Gas Reservoir In X Well Area Of Sulige Gas Field

Sulige gas field is the largest gas field found in China so far,The gas field reservoir is a typical dense sandstone,Its main pay zone is low porosity and low permeability with strong heterogeneity.Its sand bodies overlap one another and the effective reservoir is thin.A large overlap exists in the acoustic impedance of the gas-bearing sandstone and the surrounding rocks.In order to improve the success rate of "dessert" drilling in the reservoir of tight sandstone gas reservoir,this paper mainly uses the high precision seismic data and drilling drilling,logging data were used to predict the main reservoir,Neopaleozoic Permian Shihezi Formation he8 member and Shanxi Formation shan1 member..In this paper,the series of seismic prediction technology for the main reservoir of the Sulige gas field X area is studied systematically.According to the data conditions,the longitudinal wave preloading reservoir prediction technique,the longitudinal wave prestack reservoir prediction technique or the multi-wave combined reservoir prediction technique are used to develop The main channel prediction,sand body thickness prediction to the gas reservoir prediction,gas identification layer by layer in-depth prediction ideas.Through accurate analysis of rock physics sensitive parameters,AVO analysis techniques,geostatistical inversion techniques,and the use of 3D geological modeling techniques,it was concluded that rock elastic physical parameters(P-wave velocity,S-wave velocity,P-wave velocity ratio,etc.)can be well Describe the formation's lithology and fluid characteristics.The Poisson's ratio calculated from the longitudinal and transverse wave velocity ratios has good resolution for lithology and gas-bearing properties.Based on the results of seismic inversion,a detailed 3D geological model is established to further refine and enhance the seismic inversion reservoir description technology.The vertical resolution is significantly improved,and the reservoir prediction coincidence rate is greatly improved,so as to achieve the purpose of the Sulige Gas Field.The purpose of the detailed description of the interval reservoirs is to increase the reservoir thickness of the target reservoir 8 and the Shan 1 sub-segment and the accuracy of effective reservoir prediction,provide well-site support,and increase the drilling success rate.