Abstract:Tight sandstone gas is typical unconventional gas in the reservoir with low porosity and low permeability. The effective sandstone reservoir is thin and has a little difference in wave impedance from its surrounding rock after bearing gas, and its seismic response is weak. After analyzing the controlling factors including sandstone thickness, physical properties and gas-bearing property, the key technologies of seismic prediction were studied in the study area. Firstly, taking advantage of high vertical resolution of logging data and good lateral resolution of seismic data, geostatistical random simulation inversion was carried out to finely describe the sandstone distribution, then based on the mathematical relationship between the P-wave impe-dance and porosity of pure sandstone, two-step quantitative prediction of sandstone porosity and prediction of favorable reservoir distribution laws were carried out, and finally, based on fine petrophysical analysis, Poisson's ratio was selected as the sensitive elastic parameter to identify gas and water, and prestack elastic inversion was carried out based on fidelity and amplitude preserved seismic data to predict rich gas areas. The application of this method in the Sulige SX block has achieved very good exploration and development effect. Based on the structural background, and comprehensive evaluation of lithology, physical properties and gas bearing property, favorable target zones were selected, and well location were deployed.
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